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eader_timeout":{"type":"string"},"read_timeout":{"type":"string"},"shutdown_duration":{"type":"string"},"write_timeout":{"type":"string"}}},"mode":{"type":"string"},"network":{"type":"string","enum":["tcp","tcp4","tcp6","udp","udp4","udp6","unix","unixgram","unixpacket"]},"probe_wait_time":{"type":"string"},"socket_option":{"type":"object","properties":{"ip_recover_destination_addr":{"type":"boolean"},"ip_transparent":{"type":"boolean"},"net_cork":{"type":"boolean"},"net_defer_accept":{"type":"boolean"},"net_fast_open":{"type":"boolean"},"net_no_delay":{"type":"boolean"},"net_quick_ack":{"type":"boolean"},"reuse_addr":{"type":"boolean"},"reuse_port":{"type":"boolean"}}},"socket_path":{"type":"string"}}},"servicePort":{"type":"integer","maximum":65535,"minimum":0}}}}},"servers":{"type":"object","properties":{"grpc":{"type":"object","properties":{"enabled":{"type":"boolean"},"host":{"type":"string"},"port":{"type":"integer","maximum":65535,"minimum":0},"server":{"type":"object","properties":{"grpc":{"type":"object","properties":{"bidirectional_stream_concurrency":{"type":"integer"},"connection_timeout":{"type":"string"},"header_table_size":{"type":"integer"},"initial_conn_window_size":{"type":"integer"},"initial_window_size":{"type":"integer"},"interceptors":{"type":"array","items":{"type":"string","enum":["RecoverInterceptor","AccessLogInterceptor","TracePayloadInterceptor"]}},"keepalive":{"type":"object","properties":{"max_conn_age":{"type":"string"},"max_conn_age_grace":{"type":"string"},"max_conn_idle":{"type":"string"},"time":{"type":"string"},"timeout":{"type":"string"}}},"max_header_list_size":{"type":"integer"},"max_receive_message_size":{"type":"integer"},"max_send_message_size":{"type":"integer"},"read_buffer_size":{"type":"integer"},"write_buffer_size":{"type":"integer"}}},"mode":{"type":"string"},"network":{"type":"string","enum":["tcp","tcp4","tcp6","udp","udp4","udp6","unix","unixgram","unixpacket"]},"probe_wait_time":{"type":"string"},"restart":{"type":"boolean"},"socket_option":{"type":"object","properties":{"ip_recover_destination_addr":{"type":"boolean"},"ip_transparent":{"type":"boolean"},"net_cork":{"type":"boolean"},"net_defer_accept":{"type":"boolean"},"net_fast_open":{"type":"boolean"},"net_no_delay":{"type":"boolean"},"net_quick_ack":{"type":"boolean"},"reuse_addr":{"type":"boolean"},"reuse_port":{"type":"boolean"}}},"socket_path":{"type":"string"}}},"servicePort":{"type":"integer","maximum":65535,"minimum":0}}},"rest":{"type":"object","properties":{"enabled":{"type":"boolean"},"host":{"type":"string"},"port":{"type":"integer","maximum":65535,"minimum":0},"server":{"type":"object","properties":{"http":{"type":"object","properties":{"handler_timeout":{"type":"string"},"idle_timeout":{"type":"string"},"read_header_timeout":{"type":"string"},"read_timeout":{"type":"string"},"shutdown_duration":{"type":"string"},"write_timeout":{"type":"string"}}},"mode":{"type":"string"},"network":{"type":"string","enum":["tcp","tcp4","tcp6","udp","udp4","udp6","unix","unixgram","unixpacket"]},"probe_wait_time":{"type":"string"},"socket_option":{"type":"object","properties":{"ip_recover_destination_addr":{"type":"boolean"},"ip_transparent":{"type":"boolean"},"net_cork":{"type":"boolean"},"net_defer_accept":{"type":"boolean"},"net_fast_open":{"type":"boolean"},"net_no_delay":{"type":"boolean"},"net_quick_ack":{"type":"boolean"},"reuse_addr":{"type":"boolean"},"reuse_port":{"type":"boolean"}}},"socket_path":{"type":"string"}}},"servicePort":{"type":"integer","maximum":65535,"minimum":0}}}}},"tls":{"type":"object","properties":{"ca":{"type":"string"},"cert":{"type":"string"},"enabled":{"type":"boolean"},"insecure_skip_verify":{"type":"boolean"},"key":{"type":"string"}}}}},"service":{"type":"object","properties":{"annotations":{"type":"object"},"labels":{"type":"object"}}},"serviceType":{"type":"string","enum":["ClusterIP","LoadBalancer","NodePort"]},"terminationGracePeriodSeconds":{"type":"integer","minimum":0},"time_zone":{"type":"string"},"tolerations":{"type":"array","items":{"type":"object"}},"topologySpreadConstraints":{"type":"array","items":{"type":"object"}},"version":{"type":"string","pattern":"^v[0-9]+\\.[0-9]+\\.[0-9]$"},"volumeMounts":{"type":"array","items":{"type":"object"}},"volumes":{"type":"array","items":{"type":"object"}}}}}}
diff --git a/charts/vald/values.yaml b/charts/vald/values.yaml
index 0f12ebe301..fc960bdc8b 100644
--- a/charts/vald/values.yaml
+++ b/charts/vald/values.yaml
@@ -2578,6 +2578,20 @@ agent:
     # @schema {"name": "agent.ngt.enable_proactive_gc", "type": "boolean"}
     # agent.ngt.enable_proactive_gc -- enable proactive GC call for reducing heap memory allocation
     enable_proactive_gc: true
+    # @schema {"name": "agent.ngt.vqueue", "type": "object"}
+    vqueue:
+      # @schema {"name": "agent.ngt.vqueue.insert_buffer_size", "type": "integer"}
+      # agent.ngt.vqueue.insert_buffer_size -- insert channel buffer size
+      insert_buffer_size: 100
+      # @schema {"name": "agent.ngt.vqueue.delete_buffer_size", "type": "integer"}
+      # agent.ngt.vqueue.delete_buffer_size -- delete channel buffer size
+      delete_buffer_size: 100
+      # @schema {"name": "agent.ngt.vqueue.insert_buffer_pool_size", "type": "integer"}
+      # agent.ngt.vqueue.insert_buffer_pool_size -- insert slice pool buffer size
+      insert_buffer_pool_size: 10000
+      # @schema {"name": "agent.ngt.vqueue.delete_buffer_pool_size", "type": "integer"}
+      # agent.ngt.vqueue.delete_buffer_pool_size -- delete slice pool buffer size
+      delete_buffer_pool_size: 5000
   # @schema {"name": "agent.sidecar", "type": "object"}
   sidecar:
     # @schema {"name": "agent.sidecar.enabled", "type": "boolean"}
diff --git a/cmd/agent/core/ngt/sample.yaml b/cmd/agent/core/ngt/sample.yaml
index cfca962b82..bbe9094540 100644
--- a/cmd/agent/core/ngt/sample.yaml
+++ b/cmd/agent/core/ngt/sample.yaml
@@ -152,9 +152,9 @@ ngt:
   bulk_insert_chunk_size: 10
   creation_edge_size: 20
   default_epsilon: 0.01
-  default_pool_size: 10000
+  default_pool_size: 100
   default_radius: -1
-  dimension: 6
+  dimension: 100
   distance_type: l2
   enable_in_memory_mode: true
   enable_proactive_gc: true
diff --git a/go.mod b/go.mod
index 50f17ecfe9..aec4ec497f 100755
--- a/go.mod
+++ b/go.mod
@@ -5,14 +5,14 @@ go 1.16
 replace (
 	cloud.google.com/go => cloud.google.com/go v0.78.0
 	github.com/Azure/go-autorest => github.com/Azure/go-autorest v14.2.0+incompatible
-	github.com/aws/aws-sdk-go => github.com/aws/aws-sdk-go v1.37.20
+	github.com/aws/aws-sdk-go => github.com/aws/aws-sdk-go v1.37.22
 	github.com/boltdb/bolt => github.com/boltdb/bolt v1.3.1
 	github.com/chzyer/logex => github.com/chzyer/logex v1.1.11-0.20170329064859-445be9e134b2
 	github.com/coreos/etcd => go.etcd.io/etcd v3.3.25+incompatible
-	github.com/docker/docker => github.com/moby/moby v20.10.4+incompatible
+	github.com/docker/docker => github.com/moby/moby v20.10.5+incompatible
 	github.com/envoyproxy/protoc-gen-validate => github.com/envoyproxy/protoc-gen-validate v0.4.1
 	github.com/go-sql-driver/mysql => github.com/go-sql-driver/mysql v1.5.0
-	github.com/gocql/gocql => github.com/gocql/gocql v0.0.0-20210129204804-4364a4b9cfdd
+	github.com/gocql/gocql => github.com/gocql/gocql v0.0.0-20210301062520-a04dba85ed25
 	github.com/gogo/googleapis => github.com/gogo/googleapis v1.4.0
 	github.com/gogo/protobuf => github.com/gogo/protobuf v1.3.2
 	github.com/google/go-cmp => github.com/google/go-cmp v0.5.4
@@ -20,8 +20,8 @@ replace (
 	github.com/googleapis/gnostic => github.com/googleapis/gnostic v0.5.4
 	github.com/gophercloud/gophercloud => github.com/gophercloud/gophercloud v0.16.0
 	github.com/gorilla/websocket => github.com/gorilla/websocket v1.4.2
-	github.com/hailocab/go-hostpool => github.com/monzo/go-hostpool v0.0.0-20200724120130-287edbb29340
-	github.com/klauspost/compress => github.com/klauspost/compress v1.11.9-0.20210226154345-6381575b273f
+	github.com/hailocab/go-hostpool => github.com/kpango/go-hostpool v0.0.0-20210303030322-aab80263dcd0
+	github.com/klauspost/compress => github.com/klauspost/compress v1.11.10-0.20210302113407-0d78ef07f573
 	github.com/kpango/glg => github.com/kpango/glg v1.5.1
 	github.com/tensorflow/tensorflow => github.com/tensorflow/tensorflow v2.1.2+incompatible
 	golang.org/x/crypto => golang.org/x/crypto v0.0.0-20210220033148-5ea612d1eb83
@@ -76,11 +76,11 @@ require (
 	go.uber.org/zap v1.16.0
 	golang.org/x/net v0.0.0-20210226172049-e18ecbb05110
 	golang.org/x/sync v0.0.0-20210220032951-036812b2e83c
-	golang.org/x/sys v0.0.0-20210227040730-b0d1d43c014d
+	golang.org/x/sys v0.0.0-20210303074136-134d130e1a04
 	gonum.org/v1/hdf5 v0.0.0-20200504100616-496fefe91614
 	gonum.org/v1/plot v0.8.1
 	google.golang.org/api v0.40.0
-	google.golang.org/genproto v0.0.0-20210226172003-ab064af71705
+	google.golang.org/genproto v0.0.0-20210302174412-5ede27ff9881
 	google.golang.org/grpc v1.35.0
 	gopkg.in/yaml.v2 v2.4.0
 	k8s.io/api v0.20.4
diff --git a/go.sum b/go.sum
index f73cfc6d10..2f34355cce 100644
--- a/go.sum
+++ b/go.sum
@@ -60,8 +60,8 @@ github.com/armon/circbuf v0.0.0-20150827004946-bbbad097214e/go.mod h1:3U/XgcO3hC
 github.com/armon/go-metrics v0.0.0-20180917152333-f0300d1749da/go.mod h1:Q73ZrmVTwzkszR9V5SSuryQ31EELlFMUz1kKyl939pY=
 github.com/armon/go-radix v0.0.0-20180808171621-7fddfc383310/go.mod h1:ufUuZ+zHj4x4TnLV4JWEpy2hxWSpsRywHrMgIH9cCH8=
 github.com/asaskevich/govalidator v0.0.0-20190424111038-f61b66f89f4a/go.mod h1:lB+ZfQJz7igIIfQNfa7Ml4HSf2uFQQRzpGGRXenZAgY=
-github.com/aws/aws-sdk-go v1.37.20 h1:CJCXpMYmBJrRH8YwoSE0oB9S3J5ax+62F14sYlDCztg=
-github.com/aws/aws-sdk-go v1.37.20/go.mod h1:hcU610XS61/+aQV88ixoOzUoG7v3b31pl2zKMmprdro=
+github.com/aws/aws-sdk-go v1.37.22 h1:cyZp8TvUbH9rrShdrwULtCj4pB5szddrw9aKHUsw1Ic=
+github.com/aws/aws-sdk-go v1.37.22/go.mod h1:hcU610XS61/+aQV88ixoOzUoG7v3b31pl2zKMmprdro=
 github.com/beorn7/perks v0.0.0-20180321164747-3a771d992973/go.mod h1:Dwedo/Wpr24TaqPxmxbtue+5NUziq4I4S80YR8gNf3Q=
 github.com/beorn7/perks v1.0.0/go.mod h1:KWe93zE9D1o94FZ5RNwFwVgaQK1VOXiVxmqh+CedLV8=
 github.com/beorn7/perks v1.0.1 h1:VlbKKnNfV8bJzeqoa4cOKqO6bYr3WgKZxO8Z16+hsOM=
@@ -169,8 +169,8 @@ github.com/go-redis/redis/v8 v8.6.0/go.mod h1:DQ9q4Rk2HtwkrwVrdgmphoOQDMfpvcd/nH
 github.com/go-sql-driver/mysql v1.5.0 h1:ozyZYNQW3x3HtqT1jira07DN2PArx2v7/mN66gGcHOs=
 github.com/go-sql-driver/mysql v1.5.0/go.mod h1:DCzpHaOWr8IXmIStZouvnhqoel9Qv2LBy8hT2VhHyBg=
 github.com/go-stack/stack v1.8.0/go.mod h1:v0f6uXyyMGvRgIKkXu+yp6POWl0qKG85gN/melR3HDY=
-github.com/gocql/gocql v0.0.0-20210129204804-4364a4b9cfdd h1:j0VZcDIpU6sLBMNFUEvuwP4FdmEXbmaEq6qufApwbbo=
-github.com/gocql/gocql v0.0.0-20210129204804-4364a4b9cfdd/go.mod h1:DL0ekTmBSTdlNF25Orwt/JMzqIq3EJ4MVa/J/uK64OY=
+github.com/gocql/gocql v0.0.0-20210301062520-a04dba85ed25 h1:RqyFvP1RF5WLMGn9VVCSTPzg15b7jvFwJeWmWujSA6Q=
+github.com/gocql/gocql v0.0.0-20210301062520-a04dba85ed25/go.mod h1:DL0ekTmBSTdlNF25Orwt/JMzqIq3EJ4MVa/J/uK64OY=
 github.com/gocraft/dbr/v2 v2.7.1 h1:v/bqxEBTlzj9sDbFCmtO2K1M3foDnYtQn097VoMALCw=
 github.com/gocraft/dbr/v2 v2.7.1/go.mod h1:+q/T5TMzrc6BWFbcSzj7ixaaBJkbDfRsy9gq7eMsU1s=
 github.com/gogo/googleapis v1.4.0 h1:zgVt4UpGxcqVOw97aRGxT4svlcmdK35fynLNctY32zI=
@@ -295,8 +295,8 @@ github.com/jung-kurt/gofpdf v1.16.2 h1:jgbatWHfRlPYiK85qgevsZTHviWXKwB1TTiKdz5Pt
 github.com/jung-kurt/gofpdf v1.16.2/go.mod h1:1hl7y57EsiPAkLbOwzpzqgx1A30nQCk/YmFV8S2vmK0=
 github.com/kisielk/errcheck v1.5.0/go.mod h1:pFxgyoBC7bSaBwPgfKdkLd5X25qrDl4LWUI2bnpBCr8=
 github.com/kisielk/gotool v1.0.0/go.mod h1:XhKaO+MFFWcvkIS/tQcRk01m1F5IRFswLeQ+oQHNcck=
-github.com/klauspost/compress v1.11.9-0.20210226154345-6381575b273f h1:Ci0TKv+M1ZYVcpHxft0R0GR2RQ6Y6v32JJ4FKmkKo38=
-github.com/klauspost/compress v1.11.9-0.20210226154345-6381575b273f/go.mod h1:aoV0uJVorq1K+umq18yTdKaF57EivdYsUV+/s2qKfXs=
+github.com/klauspost/compress v1.11.10-0.20210302113407-0d78ef07f573 h1:ITN78bwwn3Ie6wqQ7Xq/dSsG8cJIj0+ryIh0sq2ETJI=
+github.com/klauspost/compress v1.11.10-0.20210302113407-0d78ef07f573/go.mod h1:aoV0uJVorq1K+umq18yTdKaF57EivdYsUV+/s2qKfXs=
 github.com/konsorten/go-windows-terminal-sequences v1.0.1/go.mod h1:T0+1ngSBFLxvqU3pZ+m/2kptfBszLMUkC4ZK/EgS/cQ=
 github.com/konsorten/go-windows-terminal-sequences v1.0.3 h1:CE8S1cTafDpPvMhIxNJKvHsGVBgn1xWYf1NbHQhywc8=
 github.com/konsorten/go-windows-terminal-sequences v1.0.3/go.mod h1:T0+1ngSBFLxvqU3pZ+m/2kptfBszLMUkC4ZK/EgS/cQ=
@@ -309,6 +309,8 @@ github.com/kpango/gache v1.2.5 h1:JBR4k74TSRWrfK7zk4godTl3lS4X1BWhdVD645NQYQ4=
 github.com/kpango/gache v1.2.5/go.mod h1:xiTyKBFCsq/KA3fu4aznKwnnmfMLfOch5ZI/gAD2iPY=
 github.com/kpango/glg v1.5.1 h1:ecOOgdPMt7OdDUYjoUZ9dbnY8MVwUUMc6D5ZN3exLNM=
 github.com/kpango/glg v1.5.1/go.mod h1:xIbZZSoRgDaYrXYmBK4wccGHkHK3qk61H/pK3R4qyE8=
+github.com/kpango/go-hostpool v0.0.0-20210303030322-aab80263dcd0 h1:orIEVdc68woWO1ZyYWEVOl5Kl33eDjP+kbxgbdpMwi4=
+github.com/kpango/go-hostpool v0.0.0-20210303030322-aab80263dcd0/go.mod h1:CJt2OTBmIWH7X/gYDy8fg67d26E/a8MpbGvgrKWZQxQ=
 github.com/kr/fs v0.1.0/go.mod h1:FFnZGqtBN9Gxj7eW1uZ42v5BccTP0vu6NEaFoC2HwRg=
 github.com/kr/logfmt v0.0.0-20140226030751-b84e30acd515/go.mod h1:+0opPa2QZZtGFBFZlji/RkVcI2GknAs/DXo4wKdlNEc=
 github.com/kr/pretty v0.1.0/go.mod h1:dAy3ld7l9f0ibDNOQOHHMYYIIbhfbHSm3C4ZsoJORNo=
@@ -358,8 +360,6 @@ github.com/modern-go/concurrent v0.0.0-20180306012644-bacd9c7ef1dd/go.mod h1:6dJ
 github.com/modern-go/reflect2 v0.0.0-20180701023420-4b7aa43c6742/go.mod h1:bx2lNnkwVCuqBIxFjflWJWanXIb3RllmbCylyMrvgv0=
 github.com/modern-go/reflect2 v1.0.1 h1:9f412s+6RmYXLWZSEzVVgPGK7C2PphHj5RJrvfx9AWI=
 github.com/modern-go/reflect2 v1.0.1/go.mod h1:bx2lNnkwVCuqBIxFjflWJWanXIb3RllmbCylyMrvgv0=
-github.com/monzo/go-hostpool v0.0.0-20200724120130-287edbb29340 h1:QuK697dDaOR2VjdQTtMa3kRAWdxr/upvblGXmCxrg5k=
-github.com/monzo/go-hostpool v0.0.0-20200724120130-287edbb29340/go.mod h1:XXO50svJbofYOBxMA6c3sQMMQ71W/kV5AjMZgjxUN3s=
 github.com/munnerz/goautoneg v0.0.0-20120707110453-a547fc61f48d/go.mod h1:+n7T8mK8HuQTcFwEeznm/DIxMOiR9yIdICNftLE1DvQ=
 github.com/munnerz/goautoneg v0.0.0-20191010083416-a7dc8b61c822/go.mod h1:+n7T8mK8HuQTcFwEeznm/DIxMOiR9yIdICNftLE1DvQ=
 github.com/mwitkow/go-conntrack v0.0.0-20161129095857-cc309e4a2223/go.mod h1:qRWi+5nqEBWmkhHvq77mSJWrCKwh8bxhgT7d/eI7P4U=
@@ -686,8 +686,8 @@ golang.org/x/sys v0.0.0-20210104204734-6f8348627aad/go.mod h1:h1NjWce9XRLGQEsW7w
 golang.org/x/sys v0.0.0-20210112080510-489259a85091/go.mod h1:h1NjWce9XRLGQEsW7wpKNCjG9DtNlClVuFLEZdDNbEs=
 golang.org/x/sys v0.0.0-20210119212857-b64e53b001e4/go.mod h1:h1NjWce9XRLGQEsW7wpKNCjG9DtNlClVuFLEZdDNbEs=
 golang.org/x/sys v0.0.0-20210220050731-9a76102bfb43/go.mod h1:h1NjWce9XRLGQEsW7wpKNCjG9DtNlClVuFLEZdDNbEs=
-golang.org/x/sys v0.0.0-20210227040730-b0d1d43c014d h1:9fH9JvLNoSpsDWcXJ4dSE3lZW99Z3OCUZLr07g60U6o=
-golang.org/x/sys v0.0.0-20210227040730-b0d1d43c014d/go.mod h1:h1NjWce9XRLGQEsW7wpKNCjG9DtNlClVuFLEZdDNbEs=
+golang.org/x/sys v0.0.0-20210303074136-134d130e1a04 h1:cEhElsAv9LUt9ZUUocxzWe05oFLVd+AA2nstydTeI8g=
+golang.org/x/sys v0.0.0-20210303074136-134d130e1a04/go.mod h1:h1NjWce9XRLGQEsW7wpKNCjG9DtNlClVuFLEZdDNbEs=
 golang.org/x/term v0.0.0-20201117132131-f5c789dd3221/go.mod h1:Nr5EML6q2oocZ2LXRh80K7BxOlk5/8JxuGnuhpl+muw=
 golang.org/x/term v0.0.0-20201126162022-7de9c90e9dd1 h1:v+OssWQX+hTHEmOBgwxdZxK4zHq3yOs8F9J7mk0PY8E=
 golang.org/x/term v0.0.0-20201126162022-7de9c90e9dd1/go.mod h1:bj7SfCRtBDWHUb9snDiAeCFNEtKQo2Wmx5Cou7ajbmo=
@@ -814,8 +814,8 @@ google.golang.org/genproto v0.0.0-20201019141844-1ed22bb0c154/go.mod h1:FWY/as6D
 google.golang.org/genproto v0.0.0-20201110150050-8816d57aaa9a/go.mod h1:FWY/as6DDZQgahTzZj3fqbO1CbirC29ZNUFHwi0/+no=
 google.golang.org/genproto v0.0.0-20201214200347-8c77b98c765d/go.mod h1:FWY/as6DDZQgahTzZj3fqbO1CbirC29ZNUFHwi0/+no=
 google.golang.org/genproto v0.0.0-20210222152913-aa3ee6e6a81c/go.mod h1:FWY/as6DDZQgahTzZj3fqbO1CbirC29ZNUFHwi0/+no=
-google.golang.org/genproto v0.0.0-20210226172003-ab064af71705 h1:PYBmACG+YEv8uQPW0r1kJj8tR+gkF0UWq7iFdUezwEw=
-google.golang.org/genproto v0.0.0-20210226172003-ab064af71705/go.mod h1:FWY/as6DDZQgahTzZj3fqbO1CbirC29ZNUFHwi0/+no=
+google.golang.org/genproto v0.0.0-20210302174412-5ede27ff9881 h1:SYuy3hIRsBIROE0aZwsJZOEJNC/n9/p0FmLEU9C31AE=
+google.golang.org/genproto v0.0.0-20210302174412-5ede27ff9881/go.mod h1:FWY/as6DDZQgahTzZj3fqbO1CbirC29ZNUFHwi0/+no=
 google.golang.org/grpc v1.36.0 h1:o1bcQ6imQMIOpdrO3SWf2z5RV72WbDwdXuK0MDlc8As=
 google.golang.org/grpc v1.36.0/go.mod h1:qjiiYl8FncCW8feJPdyg3v6XW24KsRHe+dy9BAGRRjU=
 google.golang.org/protobuf v1.25.0 h1:Ejskq+SyPohKW+1uil0JJMtmHCgJPJ/qWTxr8qp+R4c=
diff --git a/hack/go.mod.default b/hack/go.mod.default
index 642ca5d195..613f028fb3 100755
--- a/hack/go.mod.default
+++ b/hack/go.mod.default
@@ -21,7 +21,7 @@ replace (
 	github.com/googleapis/gnostic => github.com/googleapis/gnostic latest
 	github.com/gophercloud/gophercloud => github.com/gophercloud/gophercloud latest
 	github.com/gorilla/websocket => github.com/gorilla/websocket latest
-	github.com/hailocab/go-hostpool => github.com/monzo/go-hostpool latest
+	github.com/hailocab/go-hostpool => github.com/kpango/go-hostpool master
 	github.com/klauspost/compress => github.com/klauspost/compress master
 	github.com/tensorflow/tensorflow => github.com/tensorflow/tensorflow v2.1.2
 	golang.org/x/crypto => golang.org/x/crypto latest
diff --git a/internal/config/net_test.go b/internal/config/net_test.go
index d27fc726ef..2917198145 100644
--- a/internal/config/net_test.go
+++ b/internal/config/net_test.go
@@ -187,7 +187,7 @@ func TestDialer_Bind(t *testing.T) {
 	}
 }
 
-func TestTCP_Bind(t *testing.T) {
+func TestNet_Bind(t *testing.T) {
 	type fields struct {
 		DNS    *DNS
 		Dialer *Dialer
@@ -267,7 +267,7 @@ func TestTCP_Bind(t *testing.T) {
 	}
 }
 
-func TestTCP_Opts(t *testing.T) {
+func TestNet_Opts(t *testing.T) {
 	type fields struct {
 		DNS    *DNS
 		Dialer *Dialer
diff --git a/internal/config/ngt.go b/internal/config/ngt.go
index f235390f3f..f6b6c72492 100644
--- a/internal/config/ngt.go
+++ b/internal/config/ngt.go
@@ -20,64 +20,82 @@ package config
 // NGT represent the ngt core configuration for server.
 type NGT struct {
 	// IndexPath represent the ngt index file path
-	IndexPath string `yaml:"index_path" json:"index_path"`
+	IndexPath string `yaml:"index_path" json:"index_path,omitempty"`
 
 	// Dimension represent the ngt index dimension
-	Dimension int `yaml:"dimension" json:"dimension"`
+	Dimension int `yaml:"dimension" json:"dimension,omitempty"`
 
 	// BulkInsertChunkSize represent the bulk insert chunk size
-	BulkInsertChunkSize int `yaml:"bulk_insert_chunk_size" json:"bulk_insert_chunk_size"`
+	BulkInsertChunkSize int `yaml:"bulk_insert_chunk_size" json:"bulk_insert_chunk_size,omitempty"`
 
 	// DistanceType represent the ngt index distance type
-	DistanceType string `yaml:"distance_type" json:"distance_type"`
+	DistanceType string `yaml:"distance_type" json:"distance_type,omitempty"`
 
 	// ObjectType represent the ngt index object type float or int
-	ObjectType string `yaml:"object_type" json:"object_type"`
+	ObjectType string `yaml:"object_type" json:"object_type,omitempty"`
 
 	// CreationEdgeSize represent the index edge count
-	CreationEdgeSize int `yaml:"creation_edge_size" json:"creation_edge_size"`
+	CreationEdgeSize int `yaml:"creation_edge_size" json:"creation_edge_size,omitempty"`
 
 	// SearchEdgeSize represent the search edge size
-	SearchEdgeSize int `yaml:"search_edge_size" json:"search_edge_size"`
+	SearchEdgeSize int `yaml:"search_edge_size" json:"search_edge_size,omitempty"`
 
 	// AutoIndexDurationLimit represents auto indexing duration limit
-	AutoIndexDurationLimit string `yaml:"auto_index_duration_limit" json:"auto_index_duration_limit"`
+	AutoIndexDurationLimit string `yaml:"auto_index_duration_limit" json:"auto_index_duration_limit,omitempty"`
 
 	// AutoIndexCheckDuration represent checking loop duration about auto indexing execution
-	AutoIndexCheckDuration string `yaml:"auto_index_check_duration" json:"auto_index_check_duration"`
+	AutoIndexCheckDuration string `yaml:"auto_index_check_duration" json:"auto_index_check_duration,omitempty"`
 
 	// AutoSaveIndexDuration represent checking loop duration about auto save index execution
-	AutoSaveIndexDuration string `yaml:"auto_save_index_duration" json:"auto_save_index_duration"`
+	AutoSaveIndexDuration string `yaml:"auto_save_index_duration" json:"auto_save_index_duration,omitempty"`
 
 	// AutoIndexLength represent auto index length limit
-	AutoIndexLength int `yaml:"auto_index_length" json:"auto_index_length"`
+	AutoIndexLength int `yaml:"auto_index_length" json:"auto_index_length,omitempty"`
 
 	// InitialDelayMaxDuration represent maximum duration for initial delay
-	InitialDelayMaxDuration string `yaml:"initial_delay_max_duration" json:"initial_delay_max_duration"`
+	InitialDelayMaxDuration string `yaml:"initial_delay_max_duration" json:"initial_delay_max_duration,omitempty"`
 
 	// EnableInMemoryMode enables on memory ngt indexing mode
-	EnableInMemoryMode bool `yaml:"enable_in_memory_mode" json:"enable_in_memory_mode"`
+	EnableInMemoryMode bool `yaml:"enable_in_memory_mode" json:"enable_in_memory_mode,omitempty"`
 
 	// DefaultPoolSize represent default create index batch pool size
-	DefaultPoolSize uint32 `yaml:"default_pool_size" json:"default_pool_size"`
+	DefaultPoolSize uint32 `yaml:"default_pool_size" json:"default_pool_size,omitempty"`
 
 	// DefaultRadius represent default radius used for search
-	DefaultRadius float32 `yaml:"default_radius" json:"default_radius"`
+	DefaultRadius float32 `yaml:"default_radius" json:"default_radius,omitempty"`
 
 	// DefaultEpsilon represent default epsilon used for search
-	DefaultEpsilon float32 `yaml:"default_epsilon" json:"default_epsilon"`
+	DefaultEpsilon float32 `yaml:"default_epsilon" json:"default_epsilon,omitempty"`
 
 	// MinLoadIndexTimeout represents minimum duration of load index timeout
-	MinLoadIndexTimeout string `yaml:"min_load_index_timeout" json:"min_load_index_timeout"`
+	MinLoadIndexTimeout string `yaml:"min_load_index_timeout" json:"min_load_index_timeout,omitempty"`
 
 	// MaxLoadIndexTimeout represents maximum duration of load index timeout
-	MaxLoadIndexTimeout string `yaml:"max_load_index_timeout" json:"max_load_index_timeout"`
+	MaxLoadIndexTimeout string `yaml:"max_load_index_timeout" json:"max_load_index_timeout,omitempty"`
 
 	// LoadIndexTimeoutFactor represents a factor of load index timeout
-	LoadIndexTimeoutFactor string `yaml:"load_index_timeout_factor" json:"load_index_timeout_factor"`
+	LoadIndexTimeoutFactor string `yaml:"load_index_timeout_factor" json:"load_index_timeout_factor,omitempty"`
 
 	// EnableProactiveGC enables more proactive GC call for reducing heap memory allocation
-	EnableProactiveGC bool `yaml:"enable_proactive_gc" json:"enable_proactive_gc"`
+	EnableProactiveGC bool `yaml:"enable_proactive_gc" json:"enable_proactive_gc,omitempty"`
+
+	// VQueue represent the ngt vector queue buffer size
+	VQueue *VQueue `json:"vqueue,omitempty" yaml:"vqueue"`
+}
+
+// VQueue represent the ngt vector queue buffer size
+type VQueue struct {
+	// InsertBufferSize represents insert channel buffer size
+	InsertBufferSize int `json:"insert_buffer_size,omitempty" yaml:"insert_buffer_size"`
+
+	// InsertBufferPoolSize represents insert time ordered slice buffer size
+	InsertBufferPoolSize int `json:"insert_buffer_pool_size,omitempty" yaml:"insert_buffer_pool_size"`
+
+	// DeleteBufferSize represents delete channel buffer size
+	DeleteBufferSize int `json:"delete_buffer_size,omitempty" yaml:"delete_buffer_size"`
+
+	// DeleteBufferPoolSize represents delete time ordered slice buffer size
+	DeleteBufferPoolSize int `json:"delete_buffer_pool_size,omitempty" yaml:"delete_buffer_pool_size"`
 }
 
 // Bind returns NGT object whose some string value is filed value or environment value.
@@ -92,5 +110,8 @@ func (n *NGT) Bind() *NGT {
 	n.MinLoadIndexTimeout = GetActualValue(n.MinLoadIndexTimeout)
 	n.MaxLoadIndexTimeout = GetActualValue(n.MaxLoadIndexTimeout)
 	n.LoadIndexTimeoutFactor = GetActualValue(n.LoadIndexTimeoutFactor)
+	if n.VQueue == nil {
+		n.VQueue = new(VQueue)
+	}
 	return n
 }
diff --git a/internal/config/ngt_test.go b/internal/config/ngt_test.go
index db3a7ad0ff..a9a53ddedc 100644
--- a/internal/config/ngt_test.go
+++ b/internal/config/ngt_test.go
@@ -40,6 +40,7 @@ func TestNGT_Bind(t *testing.T) {
 		AutoIndexLength         int
 		InitialDelayMaxDuration string
 		EnableInMemoryMode      bool
+		VQueue                  *VQueue
 	}
 	type want struct {
 		want *NGT
@@ -75,6 +76,7 @@ func TestNGT_Bind(t *testing.T) {
 				AutoIndexLength:         100,
 				InitialDelayMaxDuration: "1h",
 				EnableInMemoryMode:      false,
+				VQueue:                  new(VQueue),
 			},
 			want: want{
 				want: &NGT{
@@ -91,6 +93,7 @@ func TestNGT_Bind(t *testing.T) {
 					AutoIndexLength:         100,
 					InitialDelayMaxDuration: "1h",
 					EnableInMemoryMode:      false,
+					VQueue:                  new(VQueue),
 				},
 			},
 		},
@@ -110,6 +113,7 @@ func TestNGT_Bind(t *testing.T) {
 				AutoIndexLength:         100,
 				InitialDelayMaxDuration: "_initialDelayMaxDuration_",
 				EnableInMemoryMode:      false,
+				VQueue:                  new(VQueue),
 			},
 			beforeFunc: func() {
 				_ = os.Setenv("indexPath", "config/ngt")
@@ -144,13 +148,16 @@ func TestNGT_Bind(t *testing.T) {
 					AutoIndexLength:         100,
 					InitialDelayMaxDuration: "1h",
 					EnableInMemoryMode:      false,
+					VQueue:                  new(VQueue),
 				},
 			},
 		},
 		{
 			name: "returns NGT when all fields are empty",
 			want: want{
-				want: new(NGT),
+				want: &NGT{
+					VQueue: new(VQueue),
+				},
 			},
 		},
 	}
diff --git a/internal/core/algorithm/ngt/ngt.go b/internal/core/algorithm/ngt/ngt.go
index f119b9c294..bbefc1df61 100644
--- a/internal/core/algorithm/ngt/ngt.go
+++ b/internal/core/algorithm/ngt/ngt.go
@@ -499,16 +499,14 @@ func (n *ngt) Remove(id uint) error {
 }
 
 // BulkRemove removes multiple index from NGT index.
-func (n *ngt) BulkRemove(ids ...uint) error {
-	n.mu.Lock()
-	defer n.mu.Unlock()
-	for _, id := range ids {
-		if C.ngt_remove_index(n.index, C.ObjectID(id), n.ebuf) == ErrorCode {
-			ne := n.ebuf
-			return n.newGoError(ne)
+func (n *ngt) BulkRemove(ids ...uint) (errs error) {
+	for i, id := range ids {
+		err := n.Remove(id)
+		if err != nil {
+			errs = errors.Wrapf(errs, "bulkremove error detected index number: %d,\tid: %d\terr: %v", i, id, err)
 		}
 	}
-	return nil
+	return errs
 }
 
 // GetVector returns vector stored in NGT index.
diff --git a/internal/errors/vqueue.go b/internal/errors/vqueue.go
new file mode 100644
index 0000000000..b2fc5b4a01
--- /dev/null
+++ b/internal/errors/vqueue.go
@@ -0,0 +1,20 @@
+//
+// Copyright (C) 2019-2021 vdaas.org vald team <vald@vdaas.org>
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//    https://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+//
+
+// Package errors provides error types and function
+package errors
+
+var ErrVQueueFinalizing = New("error vector queue is now finalizing...")
diff --git a/internal/net/http/middleware/timeout.go b/internal/net/http/middleware/timeout.go
index dde511ea34..7d2531aef2 100644
--- a/internal/net/http/middleware/timeout.go
+++ b/internal/net/http/middleware/timeout.go
@@ -59,26 +59,36 @@ func (t *timeout) Wrap(h rest.Func) rest.Func {
 			var code int
 			code, err = h(w, r.WithContext(ctx))
 			if err != nil {
-				sch <- code
+				select {
+				case <-ctx.Done():
+				case sch <- code:
+				}
 				runtime.Gosched()
 			}
-			ech <- err
+			select {
+			case <-ctx.Done():
+			case ech <- err:
+			}
 			return nil
 		}))
 
 		select {
+		case <-ctx.Done():
+			// timeout passed or parent context canceled first,
+			// it is the responsibility for handler to response to the user
+			return http.StatusRequestTimeout, errors.ErrHandlerTimeout(ctx.Err(), time.Duration(fastime.UnixNanoNow()-start))
 		case err = <-ech:
 			// handler finished first, may have error returned
 			if err != nil {
-				code = <-sch
+				select {
+				case <-ctx.Done():
+					return http.StatusRequestTimeout, errors.ErrHandlerTimeout(errors.Wrap(ctx.Err(), err.Error()), time.Duration(fastime.UnixNanoNow()-start))
+				case code = <-sch:
+				}
 				err = errors.ErrHandler(err)
 				return code, err
 			}
 			return http.StatusOK, nil
-		case <-ctx.Done():
-			// timeout passed or parent context canceled first,
-			// it is the responsibility for handler to response to the user
-			return http.StatusRequestTimeout, errors.ErrHandlerTimeout(ctx.Err(), time.Duration(fastime.UnixNanoNow()-start))
 		}
 	}
 }
diff --git a/internal/observability/metrics/agent/core/ngt/ngt.go b/internal/observability/metrics/agent/core/ngt/ngt.go
index 57b287a794..3cbf4b8469 100644
--- a/internal/observability/metrics/agent/core/ngt/ngt.go
+++ b/internal/observability/metrics/agent/core/ngt/ngt.go
@@ -25,15 +25,17 @@ import (
 )
 
 type ngtMetrics struct {
-	ngt                       service.NGT
-	indexCount                metrics.Int64Measure
-	uncommittedIndexCount     metrics.Int64Measure
-	insertVCacheCount         metrics.Int64Measure
-	deleteVCacheCount         metrics.Int64Measure
-	completedCreateIndexTotal metrics.Int64Measure
-	executedProactiveGCTotal  metrics.Int64Measure
-	isIndexing                metrics.Int64Measure
-	isSaving                  metrics.Int64Measure
+	ngt                            service.NGT
+	indexCount                     metrics.Int64Measure
+	uncommittedIndexCount          metrics.Int64Measure
+	insertVQueueCount              metrics.Int64Measure
+	deleteVQueueCount              metrics.Int64Measure
+	insertVQueueChannelBufferCount metrics.Int64Measure
+	deleteVQueueChannelBufferCount metrics.Int64Measure
+	completedCreateIndexTotal      metrics.Int64Measure
+	executedProactiveGCTotal       metrics.Int64Measure
+	isIndexing                     metrics.Int64Measure
+	isSaving                       metrics.Int64Measure
 }
 
 func New(n service.NGT) metrics.Metric {
@@ -47,13 +49,21 @@ func New(n service.NGT) metrics.Metric {
 			metrics.ValdOrg+"/agent/core/ngt/uncommitted_index_count",
 			"Agent NGT uncommitted index count",
 			metrics.UnitDimensionless),
-		insertVCacheCount: *metrics.Int64(
-			metrics.ValdOrg+"/agent/core/ngt/insert_vcache_count",
-			"Agent NGT insert vcache count",
+		insertVQueueCount: *metrics.Int64(
+			metrics.ValdOrg+"/agent/core/ngt/insert_vqueue_count",
+			"Agent NGT insert vqueue count",
 			metrics.UnitDimensionless),
-		deleteVCacheCount: *metrics.Int64(
-			metrics.ValdOrg+"/agent/core/ngt/delete_vcache_count",
-			"Agent NGT delete vcache count",
+		deleteVQueueCount: *metrics.Int64(
+			metrics.ValdOrg+"/agent/core/ngt/delete_vqueue_count",
+			"Agent NGT delete vqueue count",
+			metrics.UnitDimensionless),
+		insertVQueueChannelBufferCount: *metrics.Int64(
+			metrics.ValdOrg+"/agent/core/ngt/insert_vqueue_channel_buffer_count",
+			"Agent NGT insert vqueue channel buffer count",
+			metrics.UnitDimensionless),
+		deleteVQueueChannelBufferCount: *metrics.Int64(
+			metrics.ValdOrg+"/agent/core/ngt/delete_vqueue_channel_buffer_count",
+			"Agent NGT delete vqueue channel buffer count",
 			metrics.UnitDimensionless),
 		completedCreateIndexTotal: *metrics.Int64(
 			metrics.ValdOrg+"/agent/core/ngt/completed_create_index_total",
@@ -87,9 +97,11 @@ func (n *ngtMetrics) Measurement(ctx context.Context) ([]metrics.Measurement, er
 
 	return []metrics.Measurement{
 		n.indexCount.M(int64(n.ngt.Len())),
-		n.uncommittedIndexCount.M(int64(n.ngt.InsertVCacheLen() + n.ngt.DeleteVCacheLen())),
-		n.insertVCacheCount.M(int64(n.ngt.InsertVCacheLen())),
-		n.deleteVCacheCount.M(int64(n.ngt.DeleteVCacheLen())),
+		n.uncommittedIndexCount.M(int64(n.ngt.InsertVQueueBufferLen() + n.ngt.DeleteVQueueBufferLen())),
+		n.insertVQueueCount.M(int64(n.ngt.InsertVQueueBufferLen())),
+		n.deleteVQueueCount.M(int64(n.ngt.DeleteVQueueBufferLen())),
+		n.insertVQueueChannelBufferCount.M(int64(n.ngt.InsertVQueueChannelLen())),
+		n.deleteVQueueChannelBufferCount.M(int64(n.ngt.DeleteVQueueChannelLen())),
 		n.completedCreateIndexTotal.M(int64(n.ngt.NumberOfCreateIndexExecution())),
 		n.executedProactiveGCTotal.M(int64(n.ngt.NumberOfProactiveGCExecution())),
 		n.isIndexing.M(isIndexing),
@@ -116,15 +128,27 @@ func (n *ngtMetrics) View() []*metrics.View {
 			Aggregation: metrics.LastValue(),
 		},
 		{
-			Name:        "agent_core_ngt_insert_vcache_count",
-			Description: n.insertVCacheCount.Description(),
-			Measure:     &n.insertVCacheCount,
+			Name:        "agent_core_ngt_insert_vqueue_count",
+			Description: n.insertVQueueCount.Description(),
+			Measure:     &n.insertVQueueCount,
+			Aggregation: metrics.LastValue(),
+		},
+		{
+			Name:        "agent_core_ngt_delete_vqueue_count",
+			Description: n.deleteVQueueCount.Description(),
+			Measure:     &n.deleteVQueueCount,
+			Aggregation: metrics.LastValue(),
+		},
+		{
+			Name:        "agent_core_ngt_insert_vqueue_channel_buffer_count",
+			Description: n.insertVQueueChannelBufferCount.Description(),
+			Measure:     &n.insertVQueueChannelBufferCount,
 			Aggregation: metrics.LastValue(),
 		},
 		{
-			Name:        "agent_core_ngt_delete_vcache_count",
-			Description: n.deleteVCacheCount.Description(),
-			Measure:     &n.deleteVCacheCount,
+			Name:        "agent_core_ngt_delete_vqueue_channel_buffer_count",
+			Description: n.deleteVQueueChannelBufferCount.Description(),
+			Measure:     &n.deleteVQueueChannelBufferCount,
 			Aggregation: metrics.LastValue(),
 		},
 		{
diff --git a/internal/observability/metrics/agent/core/ngt/ngt_test.go b/internal/observability/metrics/agent/core/ngt/ngt_test.go
index c61391b7ff..216aae41c4 100644
--- a/internal/observability/metrics/agent/core/ngt/ngt_test.go
+++ b/internal/observability/metrics/agent/core/ngt/ngt_test.go
@@ -78,10 +78,11 @@ func TestNew(t *testing.T) {
 		*/
 	}
 
-	for _, test := range tests {
+	for _, tc := range tests {
+		test := tc
 		t.Run(test.name, func(tt *testing.T) {
 			tt.Parallel()
-			defer goleak.VerifyNone(tt)
+			defer goleak.VerifyNone(tt, goleak.IgnoreCurrent())
 			if test.beforeFunc != nil {
 				test.beforeFunc(test.args)
 			}
@@ -109,8 +110,8 @@ func Test_ngtMetrics_Measurement(t *testing.T) {
 		ngt                       service.NGT
 		indexCount                metrics.Int64Measure
 		uncommittedIndexCount     metrics.Int64Measure
-		insertVCacheCount         metrics.Int64Measure
-		deleteVCacheCount         metrics.Int64Measure
+		insertVQueueCount         metrics.Int64Measure
+		deleteVQueueCount         metrics.Int64Measure
 		completedCreateIndexTotal metrics.Int64Measure
 		executedProactiveGCTotal  metrics.Int64Measure
 		isIndexing                metrics.Int64Measure
@@ -150,8 +151,8 @@ func Test_ngtMetrics_Measurement(t *testing.T) {
 		           ngt: nil,
 		           indexCount: nil,
 		           uncommittedIndexCount: nil,
-		           insertVCacheCount: nil,
-		           deleteVCacheCount: nil,
+		           insertVQueueCount: nil,
+		           deleteVQueueCount: nil,
 		           completedCreateIndexTotal: nil,
 		           executedProactiveGCTotal: nil,
 		           isIndexing: nil,
@@ -174,8 +175,8 @@ func Test_ngtMetrics_Measurement(t *testing.T) {
 		           ngt: nil,
 		           indexCount: nil,
 		           uncommittedIndexCount: nil,
-		           insertVCacheCount: nil,
-		           deleteVCacheCount: nil,
+		           insertVQueueCount: nil,
+		           deleteVQueueCount: nil,
 		           completedCreateIndexTotal: nil,
 		           executedProactiveGCTotal: nil,
 		           isIndexing: nil,
@@ -188,10 +189,11 @@ func Test_ngtMetrics_Measurement(t *testing.T) {
 		*/
 	}
 
-	for _, test := range tests {
+	for _, tc := range tests {
+		test := tc
 		t.Run(test.name, func(tt *testing.T) {
 			tt.Parallel()
-			defer goleak.VerifyNone(tt)
+			defer goleak.VerifyNone(tt, goleak.IgnoreCurrent())
 			if test.beforeFunc != nil {
 				test.beforeFunc(test.args)
 			}
@@ -205,8 +207,8 @@ func Test_ngtMetrics_Measurement(t *testing.T) {
 				ngt:                       test.fields.ngt,
 				indexCount:                test.fields.indexCount,
 				uncommittedIndexCount:     test.fields.uncommittedIndexCount,
-				insertVCacheCount:         test.fields.insertVCacheCount,
-				deleteVCacheCount:         test.fields.deleteVCacheCount,
+				insertVQueueCount:         test.fields.insertVQueueCount,
+				deleteVQueueCount:         test.fields.deleteVQueueCount,
 				completedCreateIndexTotal: test.fields.completedCreateIndexTotal,
 				executedProactiveGCTotal:  test.fields.executedProactiveGCTotal,
 				isIndexing:                test.fields.isIndexing,
@@ -230,8 +232,8 @@ func Test_ngtMetrics_MeasurementWithTags(t *testing.T) {
 		ngt                       service.NGT
 		indexCount                metrics.Int64Measure
 		uncommittedIndexCount     metrics.Int64Measure
-		insertVCacheCount         metrics.Int64Measure
-		deleteVCacheCount         metrics.Int64Measure
+		insertVQueueCount         metrics.Int64Measure
+		deleteVQueueCount         metrics.Int64Measure
 		completedCreateIndexTotal metrics.Int64Measure
 		executedProactiveGCTotal  metrics.Int64Measure
 		isIndexing                metrics.Int64Measure
@@ -271,8 +273,8 @@ func Test_ngtMetrics_MeasurementWithTags(t *testing.T) {
 		           ngt: nil,
 		           indexCount: nil,
 		           uncommittedIndexCount: nil,
-		           insertVCacheCount: nil,
-		           deleteVCacheCount: nil,
+		           insertVQueueCount: nil,
+		           deleteVQueueCount: nil,
 		           completedCreateIndexTotal: nil,
 		           executedProactiveGCTotal: nil,
 		           isIndexing: nil,
@@ -295,8 +297,8 @@ func Test_ngtMetrics_MeasurementWithTags(t *testing.T) {
 		           ngt: nil,
 		           indexCount: nil,
 		           uncommittedIndexCount: nil,
-		           insertVCacheCount: nil,
-		           deleteVCacheCount: nil,
+		           insertVQueueCount: nil,
+		           deleteVQueueCount: nil,
 		           completedCreateIndexTotal: nil,
 		           executedProactiveGCTotal: nil,
 		           isIndexing: nil,
@@ -309,10 +311,11 @@ func Test_ngtMetrics_MeasurementWithTags(t *testing.T) {
 		*/
 	}
 
-	for _, test := range tests {
+	for _, tc := range tests {
+		test := tc
 		t.Run(test.name, func(tt *testing.T) {
 			tt.Parallel()
-			defer goleak.VerifyNone(tt)
+			defer goleak.VerifyNone(tt, goleak.IgnoreCurrent())
 			if test.beforeFunc != nil {
 				test.beforeFunc(test.args)
 			}
@@ -326,8 +329,8 @@ func Test_ngtMetrics_MeasurementWithTags(t *testing.T) {
 				ngt:                       test.fields.ngt,
 				indexCount:                test.fields.indexCount,
 				uncommittedIndexCount:     test.fields.uncommittedIndexCount,
-				insertVCacheCount:         test.fields.insertVCacheCount,
-				deleteVCacheCount:         test.fields.deleteVCacheCount,
+				insertVQueueCount:         test.fields.insertVQueueCount,
+				deleteVQueueCount:         test.fields.deleteVQueueCount,
 				completedCreateIndexTotal: test.fields.completedCreateIndexTotal,
 				executedProactiveGCTotal:  test.fields.executedProactiveGCTotal,
 				isIndexing:                test.fields.isIndexing,
@@ -348,8 +351,8 @@ func Test_ngtMetrics_View(t *testing.T) {
 		ngt                       service.NGT
 		indexCount                metrics.Int64Measure
 		uncommittedIndexCount     metrics.Int64Measure
-		insertVCacheCount         metrics.Int64Measure
-		deleteVCacheCount         metrics.Int64Measure
+		insertVQueueCount         metrics.Int64Measure
+		deleteVQueueCount         metrics.Int64Measure
 		completedCreateIndexTotal metrics.Int64Measure
 		executedProactiveGCTotal  metrics.Int64Measure
 		isIndexing                metrics.Int64Measure
@@ -381,8 +384,8 @@ func Test_ngtMetrics_View(t *testing.T) {
 		           ngt: nil,
 		           indexCount: nil,
 		           uncommittedIndexCount: nil,
-		           insertVCacheCount: nil,
-		           deleteVCacheCount: nil,
+		           insertVQueueCount: nil,
+		           deleteVQueueCount: nil,
 		           completedCreateIndexTotal: nil,
 		           executedProactiveGCTotal: nil,
 		           isIndexing: nil,
@@ -402,8 +405,8 @@ func Test_ngtMetrics_View(t *testing.T) {
 		           ngt: nil,
 		           indexCount: nil,
 		           uncommittedIndexCount: nil,
-		           insertVCacheCount: nil,
-		           deleteVCacheCount: nil,
+		           insertVQueueCount: nil,
+		           deleteVQueueCount: nil,
 		           completedCreateIndexTotal: nil,
 		           executedProactiveGCTotal: nil,
 		           isIndexing: nil,
@@ -416,10 +419,11 @@ func Test_ngtMetrics_View(t *testing.T) {
 		*/
 	}
 
-	for _, test := range tests {
+	for _, tc := range tests {
+		test := tc
 		t.Run(test.name, func(tt *testing.T) {
 			tt.Parallel()
-			defer goleak.VerifyNone(tt)
+			defer goleak.VerifyNone(tt, goleak.IgnoreCurrent())
 			if test.beforeFunc != nil {
 				test.beforeFunc()
 			}
@@ -433,8 +437,8 @@ func Test_ngtMetrics_View(t *testing.T) {
 				ngt:                       test.fields.ngt,
 				indexCount:                test.fields.indexCount,
 				uncommittedIndexCount:     test.fields.uncommittedIndexCount,
-				insertVCacheCount:         test.fields.insertVCacheCount,
-				deleteVCacheCount:         test.fields.deleteVCacheCount,
+				insertVQueueCount:         test.fields.insertVQueueCount,
+				deleteVQueueCount:         test.fields.deleteVQueueCount,
 				completedCreateIndexTotal: test.fields.completedCreateIndexTotal,
 				executedProactiveGCTotal:  test.fields.executedProactiveGCTotal,
 				isIndexing:                test.fields.isIndexing,
diff --git a/internal/servers/server/server.go b/internal/servers/server/server.go
index e6f6172d0b..cc079778ab 100644
--- a/internal/servers/server/server.go
+++ b/internal/servers/server/server.go
@@ -351,10 +351,9 @@ func (s *server) Shutdown(ctx context.Context) (rerr error) {
 			}
 			return nil
 		}))
-		tctx, cancel := context.WithTimeout(ctx, s.pwt)
-		defer cancel()
 		select {
-		case <-tctx.Done():
+		case <-ctx.Done():
+		case <-time.After(s.pwt):
 		case err := <-ech:
 			if err != nil {
 				rerr = err
@@ -362,9 +361,10 @@ func (s *server) Shutdown(ctx context.Context) (rerr error) {
 		}
 
 	} else {
-		tctx, cancel := context.WithTimeout(ctx, s.pwt)
-		defer cancel()
-		<-tctx.Done()
+		select {
+		case <-ctx.Done():
+		case <-time.After(s.pwt):
+		}
 	}
 
 	if len(s.socketPath) != 0 {
diff --git a/k8s/agent/configmap.yaml b/k8s/agent/configmap.yaml
index a11b5e55eb..ec9afadbd3 100644
--- a/k8s/agent/configmap.yaml
+++ b/k8s/agent/configmap.yaml
@@ -229,3 +229,8 @@ data:
       min_load_index_timeout: 3m
       object_type: float
       search_edge_size: 10
+      vqueue:
+        delete_buffer_pool_size: 5000
+        delete_buffer_size: 100
+        insert_buffer_pool_size: 10000
+        insert_buffer_size: 100
diff --git a/k8s/metrics/grafana/dashboards/01-vald-agent.yaml b/k8s/metrics/grafana/dashboards/01-vald-agent.yaml
index 583f95d199..289e686808 100644
--- a/k8s/metrics/grafana/dashboards/01-vald-agent.yaml
+++ b/k8s/metrics/grafana/dashboards/01-vald-agent.yaml
@@ -855,7 +855,7 @@ data:
           "pluginVersion": "7.3.4",
           "targets": [
             {
-              "expr": "sum(vald_agent_core_ngt_insert_vcache_count{namespace=\"$Namespace\", app=~\"$ReplicaSet\", instance=~\"$PodName\"})",
+              "expr": "sum(vald_agent_core_ngt_insert_vqueue_count{namespace=\"$Namespace\", app=~\"$ReplicaSet\", instance=~\"$PodName\"})",
               "instant": true,
               "interval": "",
               "legendFormat": "",
@@ -864,7 +864,7 @@ data:
           ],
           "timeFrom": null,
           "timeShift": null,
-          "title": "insert vcache",
+          "title": "insert vqueue",
           "type": "stat"
         },
         {
@@ -931,7 +931,7 @@ data:
           "pluginVersion": "7.3.4",
           "targets": [
             {
-              "expr": "sum(vald_agent_core_ngt_delete_vcache_count{namespace=\"$Namespace\", app=~\"$ReplicaSet\", instance=~\"$PodName\"})",
+              "expr": "sum(vald_agent_core_ngt_delete_vqueue_count{namespace=\"$Namespace\", app=~\"$ReplicaSet\", instance=~\"$PodName\"})",
               "instant": true,
               "interval": "",
               "legendFormat": "",
@@ -940,7 +940,7 @@ data:
           ],
           "timeFrom": null,
           "timeShift": null,
-          "title": "delete vcache",
+          "title": "delete vqueue",
           "type": "stat"
         },
         {
@@ -1286,15 +1286,15 @@ data:
               "refId": "A"
             },
             {
-              "expr": " sum(vald_agent_core_ngt_insert_vcache_count{namespace=\"$Namespace\", app=~\"$ReplicaSet\", instance=~\"$PodName\"})",
+              "expr": " sum(vald_agent_core_ngt_insert_vqueue_count{namespace=\"$Namespace\", app=~\"$ReplicaSet\", instance=~\"$PodName\"})",
               "interval": "",
-              "legendFormat": "insert-vcache",
+              "legendFormat": "insert-vqueue",
               "refId": "B"
             },
             {
-              "expr": "sum(vald_agent_core_ngt_delete_vcache_count{namespace=\"$Namespace\", app=~\"$ReplicaSet\", instance=~\"$PodName\"})",
+              "expr": "sum(vald_agent_core_ngt_delete_vqueue_count{namespace=\"$Namespace\", app=~\"$ReplicaSet\", instance=~\"$PodName\"})",
               "interval": "",
-              "legendFormat": "delete-vcache",
+              "legendFormat": "delete-vqueue",
               "refId": "C"
             }
           ],
diff --git a/pkg/agent/core/ngt/handler/grpc/handler.go b/pkg/agent/core/ngt/handler/grpc/handler.go
index 1742fcb90e..6de8f1c4c8 100644
--- a/pkg/agent/core/ngt/handler/grpc/handler.go
+++ b/pkg/agent/core/ngt/handler/grpc/handler.go
@@ -1175,7 +1175,7 @@ func (s *server) IndexInfo(ctx context.Context, _ *payload.Empty) (res *payload.
 	}()
 	return &payload.Info_Index_Count{
 		Stored:      uint32(s.ngt.Len()),
-		Uncommitted: uint32(s.ngt.InsertVCacheLen()),
+		Uncommitted: uint32(s.ngt.InsertVQueueBufferLen() + s.ngt.DeleteVQueueBufferLen()),
 		Indexing:    s.ngt.IsIndexing(),
 	}, nil
 }
diff --git a/pkg/agent/core/ngt/handler/grpc/handler_test.go b/pkg/agent/core/ngt/handler/grpc/handler_test.go
index 2afa9cee2a..b3d25d4aeb 100644
--- a/pkg/agent/core/ngt/handler/grpc/handler_test.go
+++ b/pkg/agent/core/ngt/handler/grpc/handler_test.go
@@ -431,8 +431,8 @@ func Test_server_Search(t *testing.T) {
 		streamConcurrency int
 	}
 	type want struct {
-		want *payload.Search_Response
-		err  error
+		wantRes *payload.Search_Response
+		err     error
 	}
 	type test struct {
 		name       string
@@ -443,12 +443,12 @@ func Test_server_Search(t *testing.T) {
 		beforeFunc func(args)
 		afterFunc  func(args)
 	}
-	defaultCheckFunc := func(w want, got *payload.Search_Response, err error) error {
+	defaultCheckFunc := func(w want, gotRes *payload.Search_Response, err error) error {
 		if !errors.Is(err, w.err) {
 			return errors.Errorf("got_error: \"%#v\",\n\t\t\t\twant: \"%#v\"", err, w.err)
 		}
-		if !reflect.DeepEqual(got, w.want) {
-			return errors.Errorf("got: \"%#v\",\n\t\t\t\twant: \"%#v\"", got, w.want)
+		if !reflect.DeepEqual(gotRes, w.wantRes) {
+			return errors.Errorf("got: \"%#v\",\n\t\t\t\twant: \"%#v\"", gotRes, w.wantRes)
 		}
 		return nil
 	}
@@ -518,8 +518,8 @@ func Test_server_Search(t *testing.T) {
 				streamConcurrency: test.fields.streamConcurrency,
 			}
 
-			got, err := s.Search(test.args.ctx, test.args.req)
-			if err := test.checkFunc(test.want, got, err); err != nil {
+			gotRes, err := s.Search(test.args.ctx, test.args.req)
+			if err := test.checkFunc(test.want, gotRes, err); err != nil {
 				tt.Errorf("error = %v", err)
 			}
 		})
@@ -540,8 +540,8 @@ func Test_server_SearchByID(t *testing.T) {
 		streamConcurrency int
 	}
 	type want struct {
-		want *payload.Search_Response
-		err  error
+		wantRes *payload.Search_Response
+		err     error
 	}
 	type test struct {
 		name       string
@@ -552,12 +552,12 @@ func Test_server_SearchByID(t *testing.T) {
 		beforeFunc func(args)
 		afterFunc  func(args)
 	}
-	defaultCheckFunc := func(w want, got *payload.Search_Response, err error) error {
+	defaultCheckFunc := func(w want, gotRes *payload.Search_Response, err error) error {
 		if !errors.Is(err, w.err) {
 			return errors.Errorf("got_error: \"%#v\",\n\t\t\t\twant: \"%#v\"", err, w.err)
 		}
-		if !reflect.DeepEqual(got, w.want) {
-			return errors.Errorf("got: \"%#v\",\n\t\t\t\twant: \"%#v\"", got, w.want)
+		if !reflect.DeepEqual(gotRes, w.wantRes) {
+			return errors.Errorf("got: \"%#v\",\n\t\t\t\twant: \"%#v\"", gotRes, w.wantRes)
 		}
 		return nil
 	}
@@ -627,8 +627,8 @@ func Test_server_SearchByID(t *testing.T) {
 				streamConcurrency: test.fields.streamConcurrency,
 			}
 
-			got, err := s.SearchByID(test.args.ctx, test.args.req)
-			if err := test.checkFunc(test.want, got, err); err != nil {
+			gotRes, err := s.SearchByID(test.args.ctx, test.args.req)
+			if err := test.checkFunc(test.want, gotRes, err); err != nil {
 				tt.Errorf("error = %v", err)
 			}
 		})
@@ -1791,8 +1791,8 @@ func Test_server_Upsert(t *testing.T) {
 		streamConcurrency int
 	}
 	type want struct {
-		want *payload.Object_Location
-		err  error
+		wantLoc *payload.Object_Location
+		err     error
 	}
 	type test struct {
 		name       string
@@ -1803,12 +1803,12 @@ func Test_server_Upsert(t *testing.T) {
 		beforeFunc func(args)
 		afterFunc  func(args)
 	}
-	defaultCheckFunc := func(w want, got *payload.Object_Location, err error) error {
+	defaultCheckFunc := func(w want, gotLoc *payload.Object_Location, err error) error {
 		if !errors.Is(err, w.err) {
 			return errors.Errorf("got_error: \"%#v\",\n\t\t\t\twant: \"%#v\"", err, w.err)
 		}
-		if !reflect.DeepEqual(got, w.want) {
-			return errors.Errorf("got: \"%#v\",\n\t\t\t\twant: \"%#v\"", got, w.want)
+		if !reflect.DeepEqual(gotLoc, w.wantLoc) {
+			return errors.Errorf("got: \"%#v\",\n\t\t\t\twant: \"%#v\"", gotLoc, w.wantLoc)
 		}
 		return nil
 	}
@@ -1878,8 +1878,8 @@ func Test_server_Upsert(t *testing.T) {
 				streamConcurrency: test.fields.streamConcurrency,
 			}
 
-			got, err := s.Upsert(test.args.ctx, test.args.req)
-			if err := test.checkFunc(test.want, got, err); err != nil {
+			gotLoc, err := s.Upsert(test.args.ctx, test.args.req)
+			if err := test.checkFunc(test.want, gotLoc, err); err != nil {
 				tt.Errorf("error = %v", err)
 			}
 		})
diff --git a/pkg/agent/core/ngt/service/ngt.go b/pkg/agent/core/ngt/service/ngt.go
index dfcc4579cb..af01a9504d 100644
--- a/pkg/agent/core/ngt/service/ngt.go
+++ b/pkg/agent/core/ngt/service/ngt.go
@@ -39,6 +39,7 @@ import (
 	"github.com/vdaas/vald/internal/safety"
 	"github.com/vdaas/vald/pkg/agent/core/ngt/model"
 	"github.com/vdaas/vald/pkg/agent/core/ngt/service/kvs"
+	"github.com/vdaas/vald/pkg/agent/core/ngt/service/vqueue"
 	"github.com/vdaas/vald/pkg/agent/internal/metadata"
 )
 
@@ -63,9 +64,10 @@ type NGT interface {
 	NumberOfCreateIndexExecution() uint64
 	NumberOfProactiveGCExecution() uint64
 	UUIDs(context.Context) (uuids []string)
-	UncommittedUUIDs() (uuids []string)
-	DeleteVCacheLen() uint64
-	InsertVCacheLen() uint64
+	DeleteVQueueBufferLen() uint64
+	InsertVQueueBufferLen() uint64
+	DeleteVQueueChannelLen() uint64
+	InsertVQueueChannelLen() uint64
 	Close(ctx context.Context) error
 }
 
@@ -74,8 +76,7 @@ type ngt struct {
 	core core.NGT
 	eg   errgroup.Group
 	kvs  kvs.BidiMap
-	ivc  *vcaches // insertion vector cache
-	dvc  *vcaches // deletion vector cache
+	vq   vqueue.Queue
 
 	// statuses
 	indexing  atomic.Value
@@ -83,7 +84,6 @@ type ngt struct {
 	lastNoice uint64 // last number of create index execution this value prevent unnecessary saveindex.
 
 	// counters
-	ic    uint64 // insert count
 	nocie uint64 // number of create index execution
 	nogce uint64 // number of proactive GC execution
 
@@ -112,11 +112,6 @@ type ngt struct {
 	dcd    bool          // disable commit daemon
 }
 
-type vcache struct {
-	vector []float32
-	date   int64
-}
-
 const (
 	kvsFileName = "ngt-meta.kvsdb"
 )
@@ -152,11 +147,17 @@ func New(cfg *config.NGT, opts ...Option) (nn NGT, err error) {
 	if n.dur == 0 || n.alen == 0 {
 		n.dcd = true
 	}
-	if n.ivc == nil {
-		n.ivc = new(vcaches)
-	}
-	if n.dvc == nil {
-		n.dvc = new(vcaches)
+	if n.vq == nil {
+		n.vq, err = vqueue.New(
+			vqueue.WithErrGroup(n.eg),
+			vqueue.WithInsertBufferSize(cfg.VQueue.InsertBufferSize),
+			vqueue.WithDeleteBufferSize(cfg.VQueue.DeleteBufferSize),
+			vqueue.WithInsertBufferPoolSize(cfg.VQueue.InsertBufferPoolSize),
+			vqueue.WithDeleteBufferPoolSize(cfg.VQueue.DeleteBufferPoolSize),
+		)
+		if err != nil {
+			return nil, err
+		}
 	}
 
 	n.indexing.Store(false)
@@ -312,6 +313,10 @@ func (n *ngt) Start(ctx context.Context) <-chan error {
 	}
 	ech := make(chan error, 2)
 	n.eg.Go(safety.RecoverFunc(func() (err error) {
+		vqech, err := n.vq.Start(ctx)
+		if err != nil {
+			return err
+		}
 		if n.sdur == 0 {
 			n.sdur = n.dur + time.Second
 		}
@@ -346,13 +351,18 @@ func (n *ngt) Start(ctx context.Context) <-chan error {
 				}
 				return ctx.Err()
 			case <-tick.C:
-				if int(atomic.LoadUint64(&n.ic)) >= n.alen {
+				if n.vq.IVQLen() >= n.alen {
 					err = n.CreateIndex(ctx, n.poolSize)
 				}
 			case <-limit.C:
 				err = n.CreateAndSaveIndex(ctx, n.poolSize)
 			case <-sTick.C:
 				err = n.SaveIndex(ctx)
+			case err := <-vqech:
+				if err != nil {
+					ech <- err
+					err = nil
+				}
 			}
 			if err != nil && err != errors.ErrUncommittedIndexNotFound {
 				ech <- err
@@ -361,7 +371,6 @@ func (n *ngt) Start(ctx context.Context) <-chan error {
 			}
 		}
 	}))
-
 	return ech
 }
 
@@ -386,6 +395,8 @@ func (n *ngt) Search(vec []float32, size uint32, epsilon, radius float32) ([]mod
 				ID:       key,
 				Distance: d.Distance,
 			})
+		} else {
+			log.Warn("not found", d.ID, d.Distance)
 		}
 	}
 
@@ -421,18 +432,8 @@ func (n *ngt) insert(uuid string, vec []float32, t int64, validation bool) (err
 			err = errors.ErrUUIDAlreadyExists(uuid, uint(id))
 			return err
 		}
-		_, ok = n.insertCache(uuid)
-		if ok {
-			err = errors.ErrUUIDAlreadyExists(uuid, uint(id))
-			return err
-		}
 	}
-	n.ivc.Store(uuid, vcache{
-		vector: vec,
-		date:   t,
-	})
-	atomic.AddUint64(&n.ic, 1)
-	return nil
+	return n.vq.PushInsert(uuid, vec, t)
 }
 
 func (n *ngt) InsertMultiple(vecs map[string][]float32) (err error) {
@@ -474,26 +475,9 @@ func (n *ngt) UpdateMultiple(vecs map[string][]float32) (err error) {
 	}
 	err = n.DeleteMultiple(uuids...)
 	if err != nil {
-		for _, uuid := range uuids {
-			n.dvc.Delete(uuid)
-		}
 		return err
 	}
-	t := time.Now().UnixNano()
-	for uuid, vec := range vecs {
-		ierr := n.insert(uuid, vec, t, false)
-		if ierr != nil {
-			n.dvc.Delete(uuid)
-			n.ivc.Delete(uuid)
-			atomic.AddUint64(&n.ic, ^uint64(0))
-			if err != nil {
-				err = errors.Wrap(ierr, err.Error())
-			} else {
-				err = ierr
-			}
-		}
-	}
-	return err
+	return n.InsertMultiple(vecs)
 }
 
 func (n *ngt) Delete(uuid string) (err error) {
@@ -507,20 +491,9 @@ func (n *ngt) delete(uuid string, t int64) (err error) {
 	}
 	_, ok := n.kvs.Get(uuid)
 	if !ok {
-		_, ok := n.insertCache(uuid)
-		if !ok {
-			err = errors.ErrObjectIDNotFound(uuid)
-			return err
-		}
-	}
-	if vc, ok := n.ivc.Load(uuid); ok && vc.date < t {
-		n.ivc.Delete(uuid)
-		atomic.AddUint64(&n.ic, ^uint64(0))
+		return errors.ErrObjectIDNotFound(uuid)
 	}
-	n.dvc.Store(uuid, vcache{
-		date: t,
-	})
-	return nil
+	return n.vq.PushDelete(uuid, t)
 }
 
 func (n *ngt) DeleteMultiple(uuids ...string) (err error) {
@@ -541,13 +514,13 @@ func (n *ngt) DeleteMultiple(uuids ...string) (err error) {
 func (n *ngt) GetObject(uuid string) (vec []float32, err error) {
 	oid, ok := n.kvs.Get(uuid)
 	if !ok {
-		log.Debugf("GetObject\tuuid: %s's kvs data not found, trying to read from vcache", uuid)
-		ivc, ok := n.insertCache(uuid)
+		log.Debugf("GetObject\tuuid: %s's kvs data not found, trying to read from vqueue", uuid)
+		vec, ok := n.vq.GetVector(uuid)
 		if !ok {
-			log.Debugf("GetObject\tuuid: %s's vcache data not found", uuid)
+			log.Debugf("GetObject\tuuid: %s's vqueue data not found", uuid)
 			return nil, errors.ErrObjectIDNotFound(uuid)
 		}
-		return ivc.vector, nil
+		return vec, nil
 	}
 	log.Debugf("GetObject\tGetVector oid: %d", oid)
 	vec, err = n.core.GetVector(uint(oid))
@@ -569,89 +542,46 @@ func (n *ngt) CreateIndex(ctx context.Context, poolSize uint32) (err error) {
 	if n.IsIndexing() || n.IsSaving() {
 		return nil
 	}
-	ic := atomic.LoadUint64(&n.ic)
+	ic := n.vq.IVQLen() + n.vq.DVQLen()
 	if ic == 0 {
 		return errors.ErrUncommittedIndexNotFound
 	}
 	n.indexing.Store(true)
-	atomic.StoreUint64(&n.ic, 0)
-	t := time.Now().UnixNano()
 	defer n.indexing.Store(false)
 	defer n.gc()
 
 	log.Infof("create index operation started, uncommitted indexes = %d", ic)
-	delList := make([]string, 0, ic)
-	n.dvc.Range(func(uuid string, dvc vcache) bool {
-		if dvc.date > t {
-			return true
-		}
-		if ivc, ok := n.ivc.Load(uuid); ok && ivc.date < t && ivc.date < dvc.date {
-			n.ivc.Delete(uuid)
+	log.Info("create index delete phase started")
+	n.vq.RangePopDelete(ctx, func(uuid string) bool {
+		var ierr error
+		oid, ok := n.kvs.Delete(uuid)
+		if ok {
+			ierr = n.core.Remove(uint(oid))
+			if ierr != nil {
+				log.Error(ierr)
+				err = errors.Wrap(err, ierr.Error())
+			}
+		} else {
+			ierr = errors.ErrObjectIDNotFound(uuid)
+			log.Error(ierr)
+			err = errors.Wrap(err, ierr.Error())
 		}
-		delList = append(delList, uuid)
 		return true
 	})
-	log.Info("create index delete kvs phase started")
-	log.Debugf("deleting kvs: %#v", delList)
-	doids := make([]uint, 0, ic)
-	for _, duuid := range delList {
-		n.dvc.Delete(duuid)
-		id, ok := n.kvs.Delete(duuid)
-		if !ok {
-			log.Error(errors.ErrObjectIDNotFound(duuid).Error())
-			err = errors.Wrap(err, errors.ErrObjectIDNotFound(duuid).Error())
+	log.Info("create index delete phase finished")
+	n.gc()
+	log.Info("create index insert phase started")
+	n.vq.RangePopInsert(ctx, func(uuid string, vector []float32) bool {
+		oid, ierr := n.core.Insert(vector)
+		if ierr != nil {
+			log.Error(ierr)
+			err = errors.Wrap(err, ierr.Error())
 		} else {
-			doids = append(doids, uint(id))
-		}
-	}
-	log.Info("create index delete kvs phase finished")
-
-	log.Info("create index delete index phase started")
-	log.Debugf("deleting index: %#v", doids)
-	brerr := n.core.BulkRemove(doids...)
-	log.Info("create index delete index phase finished")
-	if brerr != nil {
-		log.Error("an error occurred on deleting index phase:", brerr)
-		err = errors.Wrap(err, brerr.Error())
-	}
-	uuids := make([]string, 0, ic)
-	vecs := make([][]float32, 0, ic)
-	n.ivc.Range(func(uuid string, ivc vcache) bool {
-		if ivc.date <= t {
-			uuids = append(uuids, uuid)
-			vecs = append(vecs, ivc.vector)
+			n.kvs.Set(uuid, uint32(oid))
 		}
 		return true
 	})
-	for _, uuid := range uuids {
-		n.ivc.Delete(uuid)
-	}
-	n.gc()
-	log.Info("create index insert index phase started")
-	log.Debugf("inserting index: %#v", vecs)
-	oids, errs := n.core.BulkInsert(vecs)
-	log.Info("create index insert index phase finished")
-	if errs != nil && len(errs) != 0 {
-		for _, bierr := range errs {
-			if bierr != nil {
-				log.Error("an error occurred on inserting index phase:", bierr)
-				err = errors.Wrap(err, bierr.Error())
-			}
-		}
-	}
-
-	log.Info("create index insert kvs phase started")
-	log.Debugf("uuids = %#v\t\toids = %#v", uuids, oids)
-	for i, uuid := range uuids {
-		if len(oids) > i {
-			oid := uint32(oids[i])
-			if oid != 0 {
-				n.kvs.Set(uuid, oid)
-			}
-		}
-	}
-	log.Info("create index insert kvs phase finished")
-
+	log.Info("create index insert phase finished")
 	log.Info("create graph and tree phase started")
 	log.Debugf("pool size = %d", poolSize)
 	cierr := n.core.CreateIndex(poolSize)
@@ -766,7 +696,7 @@ func (n *ngt) CreateAndSaveIndex(ctx context.Context, poolSize uint32) (err erro
 func (n *ngt) Exists(uuid string) (oid uint32, ok bool) {
 	oid, ok = n.kvs.Get(uuid)
 	if !ok {
-		_, ok = n.insertCache(uuid)
+		_, ok = n.vq.GetVector(uuid)
 	}
 	return oid, ok
 }
@@ -790,22 +720,6 @@ func (n *ngt) readyForUpdate(uuid string, vec []float32) (ready bool) {
 	return false
 }
 
-func (n *ngt) insertCache(uuid string) (*vcache, bool) {
-	iv, ok := n.ivc.Load(uuid)
-	if ok {
-		dv, ok := n.dvc.Load(uuid)
-		if !ok {
-			return &iv, true
-		}
-		if ok && dv.date <= iv.date {
-			return &iv, true
-		}
-		n.ivc.Delete(uuid)
-		atomic.AddUint64(&n.ic, ^uint64(0))
-	}
-	return nil, false
-}
-
 func (n *ngt) IsSaving() bool {
 	s, ok := n.saving.Load().(bool)
 	return s && ok
@@ -825,18 +739,6 @@ func (n *ngt) UUIDs(ctx context.Context) (uuids []string) {
 	return uuids
 }
 
-func (n *ngt) UncommittedUUIDs() (uuids []string) {
-	var mu sync.Mutex
-	uuids = make([]string, 0, atomic.LoadUint64(&n.ic))
-	n.ivc.Range(func(uuid string, vc vcache) bool {
-		mu.Lock()
-		uuids = append(uuids, uuid)
-		mu.Unlock()
-		return true
-	})
-	return uuids
-}
-
 func (n *ngt) NumberOfCreateIndexExecution() uint64 {
 	return atomic.LoadUint64(&n.nocie)
 }
@@ -856,12 +758,20 @@ func (n *ngt) Len() uint64 {
 	return n.kvs.Len()
 }
 
-func (n *ngt) InsertVCacheLen() uint64 {
-	return n.ivc.Len()
+func (n *ngt) InsertVQueueBufferLen() uint64 {
+	return uint64(n.vq.IVQLen())
+}
+
+func (n *ngt) DeleteVQueueBufferLen() uint64 {
+	return uint64(n.vq.DVQLen())
+}
+
+func (n *ngt) InsertVQueueChannelLen() uint64 {
+	return uint64(n.vq.IVCLen())
 }
 
-func (n *ngt) DeleteVCacheLen() uint64 {
-	return n.dvc.Len()
+func (n *ngt) DeleteVQueueChannelLen() uint64 {
+	return uint64(n.vq.DVCLen())
 }
 
 func (n *ngt) Close(ctx context.Context) (err error) {
diff --git a/pkg/agent/core/ngt/service/ngt_test.go b/pkg/agent/core/ngt/service/ngt_test.go
index a97defb030..e66cad0c05 100644
--- a/pkg/agent/core/ngt/service/ngt_test.go
+++ b/pkg/agent/core/ngt/service/ngt_test.go
@@ -30,6 +30,7 @@ import (
 	"github.com/vdaas/vald/internal/errors"
 	"github.com/vdaas/vald/pkg/agent/core/ngt/model"
 	"github.com/vdaas/vald/pkg/agent/core/ngt/service/kvs"
+	"github.com/vdaas/vald/pkg/agent/core/ngt/service/vqueue"
 	"go.uber.org/goleak"
 )
 
@@ -122,12 +123,10 @@ func Test_ngt_initNGT(t *testing.T) {
 		core              core.NGT
 		eg                errgroup.Group
 		kvs               kvs.BidiMap
-		ivc               *vcaches
-		dvc               *vcaches
+		vq                vqueue.Queue
 		indexing          atomic.Value
 		saving            atomic.Value
 		lastNoice         uint64
-		ic                uint64
 		nocie             uint64
 		nogce             uint64
 		inMem             bool
@@ -176,12 +175,10 @@ func Test_ngt_initNGT(t *testing.T) {
 		           core: nil,
 		           eg: nil,
 		           kvs: nil,
-		           ivc: vcaches{},
-		           dvc: vcaches{},
+		           vq: nil,
 		           indexing: nil,
 		           saving: nil,
 		           lastNoice: 0,
-		           ic: 0,
 		           nocie: 0,
 		           nogce: 0,
 		           inMem: false,
@@ -217,12 +214,10 @@ func Test_ngt_initNGT(t *testing.T) {
 		           core: nil,
 		           eg: nil,
 		           kvs: nil,
-		           ivc: vcaches{},
-		           dvc: vcaches{},
+		           vq: nil,
 		           indexing: nil,
 		           saving: nil,
 		           lastNoice: 0,
-		           ic: 0,
 		           nocie: 0,
 		           nogce: 0,
 		           inMem: false,
@@ -266,12 +261,10 @@ func Test_ngt_initNGT(t *testing.T) {
 				core:              test.fields.core,
 				eg:                test.fields.eg,
 				kvs:               test.fields.kvs,
-				ivc:               test.fields.ivc,
-				dvc:               test.fields.dvc,
+				vq:                test.fields.vq,
 				indexing:          test.fields.indexing,
 				saving:            test.fields.saving,
 				lastNoice:         test.fields.lastNoice,
-				ic:                test.fields.ic,
 				nocie:             test.fields.nocie,
 				nogce:             test.fields.nogce,
 				inMem:             test.fields.inMem,
@@ -305,12 +298,10 @@ func Test_ngt_loadKVS(t *testing.T) {
 		core              core.NGT
 		eg                errgroup.Group
 		kvs               kvs.BidiMap
-		ivc               *vcaches
-		dvc               *vcaches
+		vq                vqueue.Queue
 		indexing          atomic.Value
 		saving            atomic.Value
 		lastNoice         uint64
-		ic                uint64
 		nocie             uint64
 		nogce             uint64
 		inMem             bool
@@ -355,12 +346,10 @@ func Test_ngt_loadKVS(t *testing.T) {
 		           core: nil,
 		           eg: nil,
 		           kvs: nil,
-		           ivc: vcaches{},
-		           dvc: vcaches{},
+		           vq: nil,
 		           indexing: nil,
 		           saving: nil,
 		           lastNoice: 0,
-		           ic: 0,
 		           nocie: 0,
 		           nogce: 0,
 		           inMem: false,
@@ -393,12 +382,10 @@ func Test_ngt_loadKVS(t *testing.T) {
 		           core: nil,
 		           eg: nil,
 		           kvs: nil,
-		           ivc: vcaches{},
-		           dvc: vcaches{},
+		           vq: nil,
 		           indexing: nil,
 		           saving: nil,
 		           lastNoice: 0,
-		           ic: 0,
 		           nocie: 0,
 		           nogce: 0,
 		           inMem: false,
@@ -442,12 +429,10 @@ func Test_ngt_loadKVS(t *testing.T) {
 				core:              test.fields.core,
 				eg:                test.fields.eg,
 				kvs:               test.fields.kvs,
-				ivc:               test.fields.ivc,
-				dvc:               test.fields.dvc,
+				vq:                test.fields.vq,
 				indexing:          test.fields.indexing,
 				saving:            test.fields.saving,
 				lastNoice:         test.fields.lastNoice,
-				ic:                test.fields.ic,
 				nocie:             test.fields.nocie,
 				nogce:             test.fields.nogce,
 				inMem:             test.fields.inMem,
@@ -484,12 +469,10 @@ func Test_ngt_Start(t *testing.T) {
 		core              core.NGT
 		eg                errgroup.Group
 		kvs               kvs.BidiMap
-		ivc               *vcaches
-		dvc               *vcaches
+		vq                vqueue.Queue
 		indexing          atomic.Value
 		saving            atomic.Value
 		lastNoice         uint64
-		ic                uint64
 		nocie             uint64
 		nogce             uint64
 		inMem             bool
@@ -538,12 +521,10 @@ func Test_ngt_Start(t *testing.T) {
 		           core: nil,
 		           eg: nil,
 		           kvs: nil,
-		           ivc: vcaches{},
-		           dvc: vcaches{},
+		           vq: nil,
 		           indexing: nil,
 		           saving: nil,
 		           lastNoice: 0,
-		           ic: 0,
 		           nocie: 0,
 		           nogce: 0,
 		           inMem: false,
@@ -579,12 +560,10 @@ func Test_ngt_Start(t *testing.T) {
 		           core: nil,
 		           eg: nil,
 		           kvs: nil,
-		           ivc: vcaches{},
-		           dvc: vcaches{},
+		           vq: nil,
 		           indexing: nil,
 		           saving: nil,
 		           lastNoice: 0,
-		           ic: 0,
 		           nocie: 0,
 		           nogce: 0,
 		           inMem: false,
@@ -628,12 +607,10 @@ func Test_ngt_Start(t *testing.T) {
 				core:              test.fields.core,
 				eg:                test.fields.eg,
 				kvs:               test.fields.kvs,
-				ivc:               test.fields.ivc,
-				dvc:               test.fields.dvc,
+				vq:                test.fields.vq,
 				indexing:          test.fields.indexing,
 				saving:            test.fields.saving,
 				lastNoice:         test.fields.lastNoice,
-				ic:                test.fields.ic,
 				nocie:             test.fields.nocie,
 				nogce:             test.fields.nogce,
 				inMem:             test.fields.inMem,
@@ -673,12 +650,10 @@ func Test_ngt_Search(t *testing.T) {
 		core              core.NGT
 		eg                errgroup.Group
 		kvs               kvs.BidiMap
-		ivc               *vcaches
-		dvc               *vcaches
+		vq                vqueue.Queue
 		indexing          atomic.Value
 		saving            atomic.Value
 		lastNoice         uint64
-		ic                uint64
 		nocie             uint64
 		nogce             uint64
 		inMem             bool
@@ -734,12 +709,10 @@ func Test_ngt_Search(t *testing.T) {
 		           core: nil,
 		           eg: nil,
 		           kvs: nil,
-		           ivc: vcaches{},
-		           dvc: vcaches{},
+		           vq: nil,
 		           indexing: nil,
 		           saving: nil,
 		           lastNoice: 0,
-		           ic: 0,
 		           nocie: 0,
 		           nogce: 0,
 		           inMem: false,
@@ -778,12 +751,10 @@ func Test_ngt_Search(t *testing.T) {
 		           core: nil,
 		           eg: nil,
 		           kvs: nil,
-		           ivc: vcaches{},
-		           dvc: vcaches{},
+		           vq: nil,
 		           indexing: nil,
 		           saving: nil,
 		           lastNoice: 0,
-		           ic: 0,
 		           nocie: 0,
 		           nogce: 0,
 		           inMem: false,
@@ -827,12 +798,10 @@ func Test_ngt_Search(t *testing.T) {
 				core:              test.fields.core,
 				eg:                test.fields.eg,
 				kvs:               test.fields.kvs,
-				ivc:               test.fields.ivc,
-				dvc:               test.fields.dvc,
+				vq:                test.fields.vq,
 				indexing:          test.fields.indexing,
 				saving:            test.fields.saving,
 				lastNoice:         test.fields.lastNoice,
-				ic:                test.fields.ic,
 				nocie:             test.fields.nocie,
 				nogce:             test.fields.nogce,
 				inMem:             test.fields.inMem,
@@ -872,12 +841,10 @@ func Test_ngt_SearchByID(t *testing.T) {
 		core              core.NGT
 		eg                errgroup.Group
 		kvs               kvs.BidiMap
-		ivc               *vcaches
-		dvc               *vcaches
+		vq                vqueue.Queue
 		indexing          atomic.Value
 		saving            atomic.Value
 		lastNoice         uint64
-		ic                uint64
 		nocie             uint64
 		nogce             uint64
 		inMem             bool
@@ -933,12 +900,10 @@ func Test_ngt_SearchByID(t *testing.T) {
 		           core: nil,
 		           eg: nil,
 		           kvs: nil,
-		           ivc: vcaches{},
-		           dvc: vcaches{},
+		           vq: nil,
 		           indexing: nil,
 		           saving: nil,
 		           lastNoice: 0,
-		           ic: 0,
 		           nocie: 0,
 		           nogce: 0,
 		           inMem: false,
@@ -977,12 +942,10 @@ func Test_ngt_SearchByID(t *testing.T) {
 		           core: nil,
 		           eg: nil,
 		           kvs: nil,
-		           ivc: vcaches{},
-		           dvc: vcaches{},
+		           vq: nil,
 		           indexing: nil,
 		           saving: nil,
 		           lastNoice: 0,
-		           ic: 0,
 		           nocie: 0,
 		           nogce: 0,
 		           inMem: false,
@@ -1026,12 +989,10 @@ func Test_ngt_SearchByID(t *testing.T) {
 				core:              test.fields.core,
 				eg:                test.fields.eg,
 				kvs:               test.fields.kvs,
-				ivc:               test.fields.ivc,
-				dvc:               test.fields.dvc,
+				vq:                test.fields.vq,
 				indexing:          test.fields.indexing,
 				saving:            test.fields.saving,
 				lastNoice:         test.fields.lastNoice,
-				ic:                test.fields.ic,
 				nocie:             test.fields.nocie,
 				nogce:             test.fields.nogce,
 				inMem:             test.fields.inMem,
@@ -1069,12 +1030,10 @@ func Test_ngt_Insert(t *testing.T) {
 		core              core.NGT
 		eg                errgroup.Group
 		kvs               kvs.BidiMap
-		ivc               *vcaches
-		dvc               *vcaches
+		vq                vqueue.Queue
 		indexing          atomic.Value
 		saving            atomic.Value
 		lastNoice         uint64
-		ic                uint64
 		nocie             uint64
 		nogce             uint64
 		inMem             bool
@@ -1124,12 +1083,10 @@ func Test_ngt_Insert(t *testing.T) {
 		           core: nil,
 		           eg: nil,
 		           kvs: nil,
-		           ivc: vcaches{},
-		           dvc: vcaches{},
+		           vq: nil,
 		           indexing: nil,
 		           saving: nil,
 		           lastNoice: 0,
-		           ic: 0,
 		           nocie: 0,
 		           nogce: 0,
 		           inMem: false,
@@ -1166,12 +1123,10 @@ func Test_ngt_Insert(t *testing.T) {
 		           core: nil,
 		           eg: nil,
 		           kvs: nil,
-		           ivc: vcaches{},
-		           dvc: vcaches{},
+		           vq: nil,
 		           indexing: nil,
 		           saving: nil,
 		           lastNoice: 0,
-		           ic: 0,
 		           nocie: 0,
 		           nogce: 0,
 		           inMem: false,
@@ -1215,12 +1170,10 @@ func Test_ngt_Insert(t *testing.T) {
 				core:              test.fields.core,
 				eg:                test.fields.eg,
 				kvs:               test.fields.kvs,
-				ivc:               test.fields.ivc,
-				dvc:               test.fields.dvc,
+				vq:                test.fields.vq,
 				indexing:          test.fields.indexing,
 				saving:            test.fields.saving,
 				lastNoice:         test.fields.lastNoice,
-				ic:                test.fields.ic,
 				nocie:             test.fields.nocie,
 				nogce:             test.fields.nogce,
 				inMem:             test.fields.inMem,
@@ -1260,12 +1213,10 @@ func Test_ngt_insert(t *testing.T) {
 		core              core.NGT
 		eg                errgroup.Group
 		kvs               kvs.BidiMap
-		ivc               *vcaches
-		dvc               *vcaches
+		vq                vqueue.Queue
 		indexing          atomic.Value
 		saving            atomic.Value
 		lastNoice         uint64
-		ic                uint64
 		nocie             uint64
 		nogce             uint64
 		inMem             bool
@@ -1317,12 +1268,10 @@ func Test_ngt_insert(t *testing.T) {
 		           core: nil,
 		           eg: nil,
 		           kvs: nil,
-		           ivc: vcaches{},
-		           dvc: vcaches{},
+		           vq: nil,
 		           indexing: nil,
 		           saving: nil,
 		           lastNoice: 0,
-		           ic: 0,
 		           nocie: 0,
 		           nogce: 0,
 		           inMem: false,
@@ -1361,12 +1310,10 @@ func Test_ngt_insert(t *testing.T) {
 		           core: nil,
 		           eg: nil,
 		           kvs: nil,
-		           ivc: vcaches{},
-		           dvc: vcaches{},
+		           vq: nil,
 		           indexing: nil,
 		           saving: nil,
 		           lastNoice: 0,
-		           ic: 0,
 		           nocie: 0,
 		           nogce: 0,
 		           inMem: false,
@@ -1410,12 +1357,10 @@ func Test_ngt_insert(t *testing.T) {
 				core:              test.fields.core,
 				eg:                test.fields.eg,
 				kvs:               test.fields.kvs,
-				ivc:               test.fields.ivc,
-				dvc:               test.fields.dvc,
+				vq:                test.fields.vq,
 				indexing:          test.fields.indexing,
 				saving:            test.fields.saving,
 				lastNoice:         test.fields.lastNoice,
-				ic:                test.fields.ic,
 				nocie:             test.fields.nocie,
 				nogce:             test.fields.nogce,
 				inMem:             test.fields.inMem,
@@ -1452,12 +1397,10 @@ func Test_ngt_InsertMultiple(t *testing.T) {
 		core              core.NGT
 		eg                errgroup.Group
 		kvs               kvs.BidiMap
-		ivc               *vcaches
-		dvc               *vcaches
+		vq                vqueue.Queue
 		indexing          atomic.Value
 		saving            atomic.Value
 		lastNoice         uint64
-		ic                uint64
 		nocie             uint64
 		nogce             uint64
 		inMem             bool
@@ -1506,12 +1449,10 @@ func Test_ngt_InsertMultiple(t *testing.T) {
 		           core: nil,
 		           eg: nil,
 		           kvs: nil,
-		           ivc: vcaches{},
-		           dvc: vcaches{},
+		           vq: nil,
 		           indexing: nil,
 		           saving: nil,
 		           lastNoice: 0,
-		           ic: 0,
 		           nocie: 0,
 		           nogce: 0,
 		           inMem: false,
@@ -1547,12 +1488,10 @@ func Test_ngt_InsertMultiple(t *testing.T) {
 		           core: nil,
 		           eg: nil,
 		           kvs: nil,
-		           ivc: vcaches{},
-		           dvc: vcaches{},
+		           vq: nil,
 		           indexing: nil,
 		           saving: nil,
 		           lastNoice: 0,
-		           ic: 0,
 		           nocie: 0,
 		           nogce: 0,
 		           inMem: false,
@@ -1596,12 +1535,10 @@ func Test_ngt_InsertMultiple(t *testing.T) {
 				core:              test.fields.core,
 				eg:                test.fields.eg,
 				kvs:               test.fields.kvs,
-				ivc:               test.fields.ivc,
-				dvc:               test.fields.dvc,
+				vq:                test.fields.vq,
 				indexing:          test.fields.indexing,
 				saving:            test.fields.saving,
 				lastNoice:         test.fields.lastNoice,
-				ic:                test.fields.ic,
 				nocie:             test.fields.nocie,
 				nogce:             test.fields.nogce,
 				inMem:             test.fields.inMem,
@@ -1639,12 +1576,10 @@ func Test_ngt_Update(t *testing.T) {
 		core              core.NGT
 		eg                errgroup.Group
 		kvs               kvs.BidiMap
-		ivc               *vcaches
-		dvc               *vcaches
+		vq                vqueue.Queue
 		indexing          atomic.Value
 		saving            atomic.Value
 		lastNoice         uint64
-		ic                uint64
 		nocie             uint64
 		nogce             uint64
 		inMem             bool
@@ -1694,12 +1629,10 @@ func Test_ngt_Update(t *testing.T) {
 		           core: nil,
 		           eg: nil,
 		           kvs: nil,
-		           ivc: vcaches{},
-		           dvc: vcaches{},
+		           vq: nil,
 		           indexing: nil,
 		           saving: nil,
 		           lastNoice: 0,
-		           ic: 0,
 		           nocie: 0,
 		           nogce: 0,
 		           inMem: false,
@@ -1736,12 +1669,10 @@ func Test_ngt_Update(t *testing.T) {
 		           core: nil,
 		           eg: nil,
 		           kvs: nil,
-		           ivc: vcaches{},
-		           dvc: vcaches{},
+		           vq: nil,
 		           indexing: nil,
 		           saving: nil,
 		           lastNoice: 0,
-		           ic: 0,
 		           nocie: 0,
 		           nogce: 0,
 		           inMem: false,
@@ -1785,12 +1716,10 @@ func Test_ngt_Update(t *testing.T) {
 				core:              test.fields.core,
 				eg:                test.fields.eg,
 				kvs:               test.fields.kvs,
-				ivc:               test.fields.ivc,
-				dvc:               test.fields.dvc,
+				vq:                test.fields.vq,
 				indexing:          test.fields.indexing,
 				saving:            test.fields.saving,
 				lastNoice:         test.fields.lastNoice,
-				ic:                test.fields.ic,
 				nocie:             test.fields.nocie,
 				nogce:             test.fields.nogce,
 				inMem:             test.fields.inMem,
@@ -1827,12 +1756,10 @@ func Test_ngt_UpdateMultiple(t *testing.T) {
 		core              core.NGT
 		eg                errgroup.Group
 		kvs               kvs.BidiMap
-		ivc               *vcaches
-		dvc               *vcaches
+		vq                vqueue.Queue
 		indexing          atomic.Value
 		saving            atomic.Value
 		lastNoice         uint64
-		ic                uint64
 		nocie             uint64
 		nogce             uint64
 		inMem             bool
@@ -1881,12 +1808,10 @@ func Test_ngt_UpdateMultiple(t *testing.T) {
 		           core: nil,
 		           eg: nil,
 		           kvs: nil,
-		           ivc: vcaches{},
-		           dvc: vcaches{},
+		           vq: nil,
 		           indexing: nil,
 		           saving: nil,
 		           lastNoice: 0,
-		           ic: 0,
 		           nocie: 0,
 		           nogce: 0,
 		           inMem: false,
@@ -1922,12 +1847,10 @@ func Test_ngt_UpdateMultiple(t *testing.T) {
 		           core: nil,
 		           eg: nil,
 		           kvs: nil,
-		           ivc: vcaches{},
-		           dvc: vcaches{},
+		           vq: nil,
 		           indexing: nil,
 		           saving: nil,
 		           lastNoice: 0,
-		           ic: 0,
 		           nocie: 0,
 		           nogce: 0,
 		           inMem: false,
@@ -1971,12 +1894,10 @@ func Test_ngt_UpdateMultiple(t *testing.T) {
 				core:              test.fields.core,
 				eg:                test.fields.eg,
 				kvs:               test.fields.kvs,
-				ivc:               test.fields.ivc,
-				dvc:               test.fields.dvc,
+				vq:                test.fields.vq,
 				indexing:          test.fields.indexing,
 				saving:            test.fields.saving,
 				lastNoice:         test.fields.lastNoice,
-				ic:                test.fields.ic,
 				nocie:             test.fields.nocie,
 				nogce:             test.fields.nogce,
 				inMem:             test.fields.inMem,
@@ -2013,12 +1934,10 @@ func Test_ngt_Delete(t *testing.T) {
 		core              core.NGT
 		eg                errgroup.Group
 		kvs               kvs.BidiMap
-		ivc               *vcaches
-		dvc               *vcaches
+		vq                vqueue.Queue
 		indexing          atomic.Value
 		saving            atomic.Value
 		lastNoice         uint64
-		ic                uint64
 		nocie             uint64
 		nogce             uint64
 		inMem             bool
@@ -2067,12 +1986,10 @@ func Test_ngt_Delete(t *testing.T) {
 		           core: nil,
 		           eg: nil,
 		           kvs: nil,
-		           ivc: vcaches{},
-		           dvc: vcaches{},
+		           vq: nil,
 		           indexing: nil,
 		           saving: nil,
 		           lastNoice: 0,
-		           ic: 0,
 		           nocie: 0,
 		           nogce: 0,
 		           inMem: false,
@@ -2108,12 +2025,10 @@ func Test_ngt_Delete(t *testing.T) {
 		           core: nil,
 		           eg: nil,
 		           kvs: nil,
-		           ivc: vcaches{},
-		           dvc: vcaches{},
+		           vq: nil,
 		           indexing: nil,
 		           saving: nil,
 		           lastNoice: 0,
-		           ic: 0,
 		           nocie: 0,
 		           nogce: 0,
 		           inMem: false,
@@ -2157,12 +2072,10 @@ func Test_ngt_Delete(t *testing.T) {
 				core:              test.fields.core,
 				eg:                test.fields.eg,
 				kvs:               test.fields.kvs,
-				ivc:               test.fields.ivc,
-				dvc:               test.fields.dvc,
+				vq:                test.fields.vq,
 				indexing:          test.fields.indexing,
 				saving:            test.fields.saving,
 				lastNoice:         test.fields.lastNoice,
-				ic:                test.fields.ic,
 				nocie:             test.fields.nocie,
 				nogce:             test.fields.nogce,
 				inMem:             test.fields.inMem,
@@ -2200,12 +2113,10 @@ func Test_ngt_delete(t *testing.T) {
 		core              core.NGT
 		eg                errgroup.Group
 		kvs               kvs.BidiMap
-		ivc               *vcaches
-		dvc               *vcaches
+		vq                vqueue.Queue
 		indexing          atomic.Value
 		saving            atomic.Value
 		lastNoice         uint64
-		ic                uint64
 		nocie             uint64
 		nogce             uint64
 		inMem             bool
@@ -2255,12 +2166,10 @@ func Test_ngt_delete(t *testing.T) {
 		           core: nil,
 		           eg: nil,
 		           kvs: nil,
-		           ivc: vcaches{},
-		           dvc: vcaches{},
+		           vq: nil,
 		           indexing: nil,
 		           saving: nil,
 		           lastNoice: 0,
-		           ic: 0,
 		           nocie: 0,
 		           nogce: 0,
 		           inMem: false,
@@ -2297,12 +2206,10 @@ func Test_ngt_delete(t *testing.T) {
 		           core: nil,
 		           eg: nil,
 		           kvs: nil,
-		           ivc: vcaches{},
-		           dvc: vcaches{},
+		           vq: nil,
 		           indexing: nil,
 		           saving: nil,
 		           lastNoice: 0,
-		           ic: 0,
 		           nocie: 0,
 		           nogce: 0,
 		           inMem: false,
@@ -2346,12 +2253,10 @@ func Test_ngt_delete(t *testing.T) {
 				core:              test.fields.core,
 				eg:                test.fields.eg,
 				kvs:               test.fields.kvs,
-				ivc:               test.fields.ivc,
-				dvc:               test.fields.dvc,
+				vq:                test.fields.vq,
 				indexing:          test.fields.indexing,
 				saving:            test.fields.saving,
 				lastNoice:         test.fields.lastNoice,
-				ic:                test.fields.ic,
 				nocie:             test.fields.nocie,
 				nogce:             test.fields.nogce,
 				inMem:             test.fields.inMem,
@@ -2388,12 +2293,10 @@ func Test_ngt_DeleteMultiple(t *testing.T) {
 		core              core.NGT
 		eg                errgroup.Group
 		kvs               kvs.BidiMap
-		ivc               *vcaches
-		dvc               *vcaches
+		vq                vqueue.Queue
 		indexing          atomic.Value
 		saving            atomic.Value
 		lastNoice         uint64
-		ic                uint64
 		nocie             uint64
 		nogce             uint64
 		inMem             bool
@@ -2442,12 +2345,10 @@ func Test_ngt_DeleteMultiple(t *testing.T) {
 		           core: nil,
 		           eg: nil,
 		           kvs: nil,
-		           ivc: vcaches{},
-		           dvc: vcaches{},
+		           vq: nil,
 		           indexing: nil,
 		           saving: nil,
 		           lastNoice: 0,
-		           ic: 0,
 		           nocie: 0,
 		           nogce: 0,
 		           inMem: false,
@@ -2483,12 +2384,10 @@ func Test_ngt_DeleteMultiple(t *testing.T) {
 		           core: nil,
 		           eg: nil,
 		           kvs: nil,
-		           ivc: vcaches{},
-		           dvc: vcaches{},
+		           vq: nil,
 		           indexing: nil,
 		           saving: nil,
 		           lastNoice: 0,
-		           ic: 0,
 		           nocie: 0,
 		           nogce: 0,
 		           inMem: false,
@@ -2532,12 +2431,10 @@ func Test_ngt_DeleteMultiple(t *testing.T) {
 				core:              test.fields.core,
 				eg:                test.fields.eg,
 				kvs:               test.fields.kvs,
-				ivc:               test.fields.ivc,
-				dvc:               test.fields.dvc,
+				vq:                test.fields.vq,
 				indexing:          test.fields.indexing,
 				saving:            test.fields.saving,
 				lastNoice:         test.fields.lastNoice,
-				ic:                test.fields.ic,
 				nocie:             test.fields.nocie,
 				nogce:             test.fields.nogce,
 				inMem:             test.fields.inMem,
@@ -2574,12 +2471,10 @@ func Test_ngt_GetObject(t *testing.T) {
 		core              core.NGT
 		eg                errgroup.Group
 		kvs               kvs.BidiMap
-		ivc               *vcaches
-		dvc               *vcaches
+		vq                vqueue.Queue
 		indexing          atomic.Value
 		saving            atomic.Value
 		lastNoice         uint64
-		ic                uint64
 		nocie             uint64
 		nogce             uint64
 		inMem             bool
@@ -2632,12 +2527,10 @@ func Test_ngt_GetObject(t *testing.T) {
 		           core: nil,
 		           eg: nil,
 		           kvs: nil,
-		           ivc: vcaches{},
-		           dvc: vcaches{},
+		           vq: nil,
 		           indexing: nil,
 		           saving: nil,
 		           lastNoice: 0,
-		           ic: 0,
 		           nocie: 0,
 		           nogce: 0,
 		           inMem: false,
@@ -2673,12 +2566,10 @@ func Test_ngt_GetObject(t *testing.T) {
 		           core: nil,
 		           eg: nil,
 		           kvs: nil,
-		           ivc: vcaches{},
-		           dvc: vcaches{},
+		           vq: nil,
 		           indexing: nil,
 		           saving: nil,
 		           lastNoice: 0,
-		           ic: 0,
 		           nocie: 0,
 		           nogce: 0,
 		           inMem: false,
@@ -2722,12 +2613,10 @@ func Test_ngt_GetObject(t *testing.T) {
 				core:              test.fields.core,
 				eg:                test.fields.eg,
 				kvs:               test.fields.kvs,
-				ivc:               test.fields.ivc,
-				dvc:               test.fields.dvc,
+				vq:                test.fields.vq,
 				indexing:          test.fields.indexing,
 				saving:            test.fields.saving,
 				lastNoice:         test.fields.lastNoice,
-				ic:                test.fields.ic,
 				nocie:             test.fields.nocie,
 				nogce:             test.fields.nogce,
 				inMem:             test.fields.inMem,
@@ -2765,12 +2654,10 @@ func Test_ngt_CreateIndex(t *testing.T) {
 		core              core.NGT
 		eg                errgroup.Group
 		kvs               kvs.BidiMap
-		ivc               *vcaches
-		dvc               *vcaches
+		vq                vqueue.Queue
 		indexing          atomic.Value
 		saving            atomic.Value
 		lastNoice         uint64
-		ic                uint64
 		nocie             uint64
 		nogce             uint64
 		inMem             bool
@@ -2820,12 +2707,10 @@ func Test_ngt_CreateIndex(t *testing.T) {
 		           core: nil,
 		           eg: nil,
 		           kvs: nil,
-		           ivc: vcaches{},
-		           dvc: vcaches{},
+		           vq: nil,
 		           indexing: nil,
 		           saving: nil,
 		           lastNoice: 0,
-		           ic: 0,
 		           nocie: 0,
 		           nogce: 0,
 		           inMem: false,
@@ -2862,12 +2747,10 @@ func Test_ngt_CreateIndex(t *testing.T) {
 		           core: nil,
 		           eg: nil,
 		           kvs: nil,
-		           ivc: vcaches{},
-		           dvc: vcaches{},
+		           vq: nil,
 		           indexing: nil,
 		           saving: nil,
 		           lastNoice: 0,
-		           ic: 0,
 		           nocie: 0,
 		           nogce: 0,
 		           inMem: false,
@@ -2911,12 +2794,10 @@ func Test_ngt_CreateIndex(t *testing.T) {
 				core:              test.fields.core,
 				eg:                test.fields.eg,
 				kvs:               test.fields.kvs,
-				ivc:               test.fields.ivc,
-				dvc:               test.fields.dvc,
+				vq:                test.fields.vq,
 				indexing:          test.fields.indexing,
 				saving:            test.fields.saving,
 				lastNoice:         test.fields.lastNoice,
-				ic:                test.fields.ic,
 				nocie:             test.fields.nocie,
 				nogce:             test.fields.nogce,
 				inMem:             test.fields.inMem,
@@ -2953,12 +2834,10 @@ func Test_ngt_SaveIndex(t *testing.T) {
 		core              core.NGT
 		eg                errgroup.Group
 		kvs               kvs.BidiMap
-		ivc               *vcaches
-		dvc               *vcaches
+		vq                vqueue.Queue
 		indexing          atomic.Value
 		saving            atomic.Value
 		lastNoice         uint64
-		ic                uint64
 		nocie             uint64
 		nogce             uint64
 		inMem             bool
@@ -3007,12 +2886,10 @@ func Test_ngt_SaveIndex(t *testing.T) {
 		           core: nil,
 		           eg: nil,
 		           kvs: nil,
-		           ivc: vcaches{},
-		           dvc: vcaches{},
+		           vq: nil,
 		           indexing: nil,
 		           saving: nil,
 		           lastNoice: 0,
-		           ic: 0,
 		           nocie: 0,
 		           nogce: 0,
 		           inMem: false,
@@ -3048,12 +2925,10 @@ func Test_ngt_SaveIndex(t *testing.T) {
 		           core: nil,
 		           eg: nil,
 		           kvs: nil,
-		           ivc: vcaches{},
-		           dvc: vcaches{},
+		           vq: nil,
 		           indexing: nil,
 		           saving: nil,
 		           lastNoice: 0,
-		           ic: 0,
 		           nocie: 0,
 		           nogce: 0,
 		           inMem: false,
@@ -3097,12 +2972,10 @@ func Test_ngt_SaveIndex(t *testing.T) {
 				core:              test.fields.core,
 				eg:                test.fields.eg,
 				kvs:               test.fields.kvs,
-				ivc:               test.fields.ivc,
-				dvc:               test.fields.dvc,
+				vq:                test.fields.vq,
 				indexing:          test.fields.indexing,
 				saving:            test.fields.saving,
 				lastNoice:         test.fields.lastNoice,
-				ic:                test.fields.ic,
 				nocie:             test.fields.nocie,
 				nogce:             test.fields.nogce,
 				inMem:             test.fields.inMem,
@@ -3139,12 +3012,10 @@ func Test_ngt_saveIndex(t *testing.T) {
 		core              core.NGT
 		eg                errgroup.Group
 		kvs               kvs.BidiMap
-		ivc               *vcaches
-		dvc               *vcaches
+		vq                vqueue.Queue
 		indexing          atomic.Value
 		saving            atomic.Value
 		lastNoice         uint64
-		ic                uint64
 		nocie             uint64
 		nogce             uint64
 		inMem             bool
@@ -3193,12 +3064,10 @@ func Test_ngt_saveIndex(t *testing.T) {
 		           core: nil,
 		           eg: nil,
 		           kvs: nil,
-		           ivc: vcaches{},
-		           dvc: vcaches{},
+		           vq: nil,
 		           indexing: nil,
 		           saving: nil,
 		           lastNoice: 0,
-		           ic: 0,
 		           nocie: 0,
 		           nogce: 0,
 		           inMem: false,
@@ -3234,12 +3103,10 @@ func Test_ngt_saveIndex(t *testing.T) {
 		           core: nil,
 		           eg: nil,
 		           kvs: nil,
-		           ivc: vcaches{},
-		           dvc: vcaches{},
+		           vq: nil,
 		           indexing: nil,
 		           saving: nil,
 		           lastNoice: 0,
-		           ic: 0,
 		           nocie: 0,
 		           nogce: 0,
 		           inMem: false,
@@ -3283,12 +3150,10 @@ func Test_ngt_saveIndex(t *testing.T) {
 				core:              test.fields.core,
 				eg:                test.fields.eg,
 				kvs:               test.fields.kvs,
-				ivc:               test.fields.ivc,
-				dvc:               test.fields.dvc,
+				vq:                test.fields.vq,
 				indexing:          test.fields.indexing,
 				saving:            test.fields.saving,
 				lastNoice:         test.fields.lastNoice,
-				ic:                test.fields.ic,
 				nocie:             test.fields.nocie,
 				nogce:             test.fields.nogce,
 				inMem:             test.fields.inMem,
@@ -3326,12 +3191,10 @@ func Test_ngt_CreateAndSaveIndex(t *testing.T) {
 		core              core.NGT
 		eg                errgroup.Group
 		kvs               kvs.BidiMap
-		ivc               *vcaches
-		dvc               *vcaches
+		vq                vqueue.Queue
 		indexing          atomic.Value
 		saving            atomic.Value
 		lastNoice         uint64
-		ic                uint64
 		nocie             uint64
 		nogce             uint64
 		inMem             bool
@@ -3381,12 +3244,10 @@ func Test_ngt_CreateAndSaveIndex(t *testing.T) {
 		           core: nil,
 		           eg: nil,
 		           kvs: nil,
-		           ivc: vcaches{},
-		           dvc: vcaches{},
+		           vq: nil,
 		           indexing: nil,
 		           saving: nil,
 		           lastNoice: 0,
-		           ic: 0,
 		           nocie: 0,
 		           nogce: 0,
 		           inMem: false,
@@ -3423,12 +3284,10 @@ func Test_ngt_CreateAndSaveIndex(t *testing.T) {
 		           core: nil,
 		           eg: nil,
 		           kvs: nil,
-		           ivc: vcaches{},
-		           dvc: vcaches{},
+		           vq: nil,
 		           indexing: nil,
 		           saving: nil,
 		           lastNoice: 0,
-		           ic: 0,
 		           nocie: 0,
 		           nogce: 0,
 		           inMem: false,
@@ -3472,12 +3331,10 @@ func Test_ngt_CreateAndSaveIndex(t *testing.T) {
 				core:              test.fields.core,
 				eg:                test.fields.eg,
 				kvs:               test.fields.kvs,
-				ivc:               test.fields.ivc,
-				dvc:               test.fields.dvc,
+				vq:                test.fields.vq,
 				indexing:          test.fields.indexing,
 				saving:            test.fields.saving,
 				lastNoice:         test.fields.lastNoice,
-				ic:                test.fields.ic,
 				nocie:             test.fields.nocie,
 				nogce:             test.fields.nogce,
 				inMem:             test.fields.inMem,
@@ -3514,12 +3371,10 @@ func Test_ngt_Exists(t *testing.T) {
 		core              core.NGT
 		eg                errgroup.Group
 		kvs               kvs.BidiMap
-		ivc               *vcaches
-		dvc               *vcaches
+		vq                vqueue.Queue
 		indexing          atomic.Value
 		saving            atomic.Value
 		lastNoice         uint64
-		ic                uint64
 		nocie             uint64
 		nogce             uint64
 		inMem             bool
@@ -3572,12 +3427,10 @@ func Test_ngt_Exists(t *testing.T) {
 		           core: nil,
 		           eg: nil,
 		           kvs: nil,
-		           ivc: vcaches{},
-		           dvc: vcaches{},
+		           vq: nil,
 		           indexing: nil,
 		           saving: nil,
 		           lastNoice: 0,
-		           ic: 0,
 		           nocie: 0,
 		           nogce: 0,
 		           inMem: false,
@@ -3613,12 +3466,10 @@ func Test_ngt_Exists(t *testing.T) {
 		           core: nil,
 		           eg: nil,
 		           kvs: nil,
-		           ivc: vcaches{},
-		           dvc: vcaches{},
+		           vq: nil,
 		           indexing: nil,
 		           saving: nil,
 		           lastNoice: 0,
-		           ic: 0,
 		           nocie: 0,
 		           nogce: 0,
 		           inMem: false,
@@ -3662,12 +3513,10 @@ func Test_ngt_Exists(t *testing.T) {
 				core:              test.fields.core,
 				eg:                test.fields.eg,
 				kvs:               test.fields.kvs,
-				ivc:               test.fields.ivc,
-				dvc:               test.fields.dvc,
+				vq:                test.fields.vq,
 				indexing:          test.fields.indexing,
 				saving:            test.fields.saving,
 				lastNoice:         test.fields.lastNoice,
-				ic:                test.fields.ic,
 				nocie:             test.fields.nocie,
 				nogce:             test.fields.nogce,
 				inMem:             test.fields.inMem,
@@ -3705,12 +3554,10 @@ func Test_ngt_readyForUpdate(t *testing.T) {
 		core              core.NGT
 		eg                errgroup.Group
 		kvs               kvs.BidiMap
-		ivc               *vcaches
-		dvc               *vcaches
+		vq                vqueue.Queue
 		indexing          atomic.Value
 		saving            atomic.Value
 		lastNoice         uint64
-		ic                uint64
 		nocie             uint64
 		nogce             uint64
 		inMem             bool
@@ -3760,12 +3607,10 @@ func Test_ngt_readyForUpdate(t *testing.T) {
 		           core: nil,
 		           eg: nil,
 		           kvs: nil,
-		           ivc: vcaches{},
-		           dvc: vcaches{},
+		           vq: nil,
 		           indexing: nil,
 		           saving: nil,
 		           lastNoice: 0,
-		           ic: 0,
 		           nocie: 0,
 		           nogce: 0,
 		           inMem: false,
@@ -3802,12 +3647,10 @@ func Test_ngt_readyForUpdate(t *testing.T) {
 		           core: nil,
 		           eg: nil,
 		           kvs: nil,
-		           ivc: vcaches{},
-		           dvc: vcaches{},
+		           vq: nil,
 		           indexing: nil,
 		           saving: nil,
 		           lastNoice: 0,
-		           ic: 0,
 		           nocie: 0,
 		           nogce: 0,
 		           inMem: false,
@@ -3851,12 +3694,10 @@ func Test_ngt_readyForUpdate(t *testing.T) {
 				core:              test.fields.core,
 				eg:                test.fields.eg,
 				kvs:               test.fields.kvs,
-				ivc:               test.fields.ivc,
-				dvc:               test.fields.dvc,
+				vq:                test.fields.vq,
 				indexing:          test.fields.indexing,
 				saving:            test.fields.saving,
 				lastNoice:         test.fields.lastNoice,
-				ic:                test.fields.ic,
 				nocie:             test.fields.nocie,
 				nogce:             test.fields.nogce,
 				inMem:             test.fields.inMem,
@@ -3884,21 +3725,16 @@ func Test_ngt_readyForUpdate(t *testing.T) {
 	}
 }
 
-func Test_ngt_insertCache(t *testing.T) {
+func Test_ngt_IsSaving(t *testing.T) {
 	t.Parallel()
-	type args struct {
-		uuid string
-	}
 	type fields struct {
 		core              core.NGT
 		eg                errgroup.Group
 		kvs               kvs.BidiMap
-		ivc               *vcaches
-		dvc               *vcaches
+		vq                vqueue.Queue
 		indexing          atomic.Value
 		saving            atomic.Value
 		lastNoice         uint64
-		ic                uint64
 		nocie             uint64
 		nogce             uint64
 		inMem             bool
@@ -3918,25 +3754,20 @@ func Test_ngt_insertCache(t *testing.T) {
 		dcd               bool
 	}
 	type want struct {
-		want  *vcache
-		want1 bool
+		want bool
 	}
 	type test struct {
 		name       string
-		args       args
 		fields     fields
 		want       want
-		checkFunc  func(want, *vcache, bool) error
-		beforeFunc func(args)
-		afterFunc  func(args)
+		checkFunc  func(want, bool) error
+		beforeFunc func()
+		afterFunc  func()
 	}
-	defaultCheckFunc := func(w want, got *vcache, got1 bool) error {
+	defaultCheckFunc := func(w want, got bool) error {
 		if !reflect.DeepEqual(got, w.want) {
 			return errors.Errorf("got: \"%#v\",\n\t\t\t\twant: \"%#v\"", got, w.want)
 		}
-		if !reflect.DeepEqual(got1, w.want1) {
-			return errors.Errorf("got: \"%#v\",\n\t\t\t\twant: \"%#v\"", got1, w.want1)
-		}
 		return nil
 	}
 	tests := []test{
@@ -3944,19 +3775,14 @@ func Test_ngt_insertCache(t *testing.T) {
 		/*
 		   {
 		       name: "test_case_1",
-		       args: args {
-		           uuid: "",
-		       },
 		       fields: fields {
 		           core: nil,
 		           eg: nil,
 		           kvs: nil,
-		           ivc: vcaches{},
-		           dvc: vcaches{},
+		           vq: nil,
 		           indexing: nil,
 		           saving: nil,
 		           lastNoice: 0,
-		           ic: 0,
 		           nocie: 0,
 		           nogce: 0,
 		           inMem: false,
@@ -3985,19 +3811,14 @@ func Test_ngt_insertCache(t *testing.T) {
 		   func() test {
 		       return test {
 		           name: "test_case_2",
-		           args: args {
-		           uuid: "",
-		           },
 		           fields: fields {
 		           core: nil,
 		           eg: nil,
 		           kvs: nil,
-		           ivc: vcaches{},
-		           dvc: vcaches{},
+		           vq: nil,
 		           indexing: nil,
 		           saving: nil,
 		           lastNoice: 0,
-		           ic: 0,
 		           nocie: 0,
 		           nogce: 0,
 		           inMem: false,
@@ -4029,10 +3850,10 @@ func Test_ngt_insertCache(t *testing.T) {
 			tt.Parallel()
 			defer goleak.VerifyNone(tt, goleak.IgnoreCurrent())
 			if test.beforeFunc != nil {
-				test.beforeFunc(test.args)
+				test.beforeFunc()
 			}
 			if test.afterFunc != nil {
-				defer test.afterFunc(test.args)
+				defer test.afterFunc()
 			}
 			if test.checkFunc == nil {
 				test.checkFunc = defaultCheckFunc
@@ -4041,12 +3862,10 @@ func Test_ngt_insertCache(t *testing.T) {
 				core:              test.fields.core,
 				eg:                test.fields.eg,
 				kvs:               test.fields.kvs,
-				ivc:               test.fields.ivc,
-				dvc:               test.fields.dvc,
+				vq:                test.fields.vq,
 				indexing:          test.fields.indexing,
 				saving:            test.fields.saving,
 				lastNoice:         test.fields.lastNoice,
-				ic:                test.fields.ic,
 				nocie:             test.fields.nocie,
 				nogce:             test.fields.nogce,
 				inMem:             test.fields.inMem,
@@ -4066,26 +3885,24 @@ func Test_ngt_insertCache(t *testing.T) {
 				dcd:               test.fields.dcd,
 			}
 
-			got, got1 := n.insertCache(test.args.uuid)
-			if err := test.checkFunc(test.want, got, got1); err != nil {
+			got := n.IsSaving()
+			if err := test.checkFunc(test.want, got); err != nil {
 				tt.Errorf("error = %v", err)
 			}
 		})
 	}
 }
 
-func Test_ngt_IsSaving(t *testing.T) {
+func Test_ngt_IsIndexing(t *testing.T) {
 	t.Parallel()
 	type fields struct {
 		core              core.NGT
 		eg                errgroup.Group
 		kvs               kvs.BidiMap
-		ivc               *vcaches
-		dvc               *vcaches
+		vq                vqueue.Queue
 		indexing          atomic.Value
 		saving            atomic.Value
 		lastNoice         uint64
-		ic                uint64
 		nocie             uint64
 		nogce             uint64
 		inMem             bool
@@ -4130,12 +3947,10 @@ func Test_ngt_IsSaving(t *testing.T) {
 		           core: nil,
 		           eg: nil,
 		           kvs: nil,
-		           ivc: vcaches{},
-		           dvc: vcaches{},
+		           vq: nil,
 		           indexing: nil,
 		           saving: nil,
 		           lastNoice: 0,
-		           ic: 0,
 		           nocie: 0,
 		           nogce: 0,
 		           inMem: false,
@@ -4168,12 +3983,10 @@ func Test_ngt_IsSaving(t *testing.T) {
 		           core: nil,
 		           eg: nil,
 		           kvs: nil,
-		           ivc: vcaches{},
-		           dvc: vcaches{},
+		           vq: nil,
 		           indexing: nil,
 		           saving: nil,
 		           lastNoice: 0,
-		           ic: 0,
 		           nocie: 0,
 		           nogce: 0,
 		           inMem: false,
@@ -4217,12 +4030,10 @@ func Test_ngt_IsSaving(t *testing.T) {
 				core:              test.fields.core,
 				eg:                test.fields.eg,
 				kvs:               test.fields.kvs,
-				ivc:               test.fields.ivc,
-				dvc:               test.fields.dvc,
+				vq:                test.fields.vq,
 				indexing:          test.fields.indexing,
 				saving:            test.fields.saving,
 				lastNoice:         test.fields.lastNoice,
-				ic:                test.fields.ic,
 				nocie:             test.fields.nocie,
 				nogce:             test.fields.nogce,
 				inMem:             test.fields.inMem,
@@ -4242,7 +4053,7 @@ func Test_ngt_IsSaving(t *testing.T) {
 				dcd:               test.fields.dcd,
 			}
 
-			got := n.IsSaving()
+			got := n.IsIndexing()
 			if err := test.checkFunc(test.want, got); err != nil {
 				tt.Errorf("error = %v", err)
 			}
@@ -4250,18 +4061,19 @@ func Test_ngt_IsSaving(t *testing.T) {
 	}
 }
 
-func Test_ngt_IsIndexing(t *testing.T) {
+func Test_ngt_UUIDs(t *testing.T) {
 	t.Parallel()
+	type args struct {
+		ctx context.Context
+	}
 	type fields struct {
 		core              core.NGT
 		eg                errgroup.Group
 		kvs               kvs.BidiMap
-		ivc               *vcaches
-		dvc               *vcaches
+		vq                vqueue.Queue
 		indexing          atomic.Value
 		saving            atomic.Value
 		lastNoice         uint64
-		ic                uint64
 		nocie             uint64
 		nogce             uint64
 		inMem             bool
@@ -4281,19 +4093,20 @@ func Test_ngt_IsIndexing(t *testing.T) {
 		dcd               bool
 	}
 	type want struct {
-		want bool
+		wantUuids []string
 	}
 	type test struct {
 		name       string
+		args       args
 		fields     fields
 		want       want
-		checkFunc  func(want, bool) error
-		beforeFunc func()
-		afterFunc  func()
+		checkFunc  func(want, []string) error
+		beforeFunc func(args)
+		afterFunc  func(args)
 	}
-	defaultCheckFunc := func(w want, got bool) error {
-		if !reflect.DeepEqual(got, w.want) {
-			return errors.Errorf("got: \"%#v\",\n\t\t\t\twant: \"%#v\"", got, w.want)
+	defaultCheckFunc := func(w want, gotUuids []string) error {
+		if !reflect.DeepEqual(gotUuids, w.wantUuids) {
+			return errors.Errorf("got: \"%#v\",\n\t\t\t\twant: \"%#v\"", gotUuids, w.wantUuids)
 		}
 		return nil
 	}
@@ -4302,16 +4115,17 @@ func Test_ngt_IsIndexing(t *testing.T) {
 		/*
 		   {
 		       name: "test_case_1",
+		       args: args {
+		           ctx: nil,
+		       },
 		       fields: fields {
 		           core: nil,
 		           eg: nil,
 		           kvs: nil,
-		           ivc: vcaches{},
-		           dvc: vcaches{},
+		           vq: nil,
 		           indexing: nil,
 		           saving: nil,
 		           lastNoice: 0,
-		           ic: 0,
 		           nocie: 0,
 		           nogce: 0,
 		           inMem: false,
@@ -4340,16 +4154,17 @@ func Test_ngt_IsIndexing(t *testing.T) {
 		   func() test {
 		       return test {
 		           name: "test_case_2",
+		           args: args {
+		           ctx: nil,
+		           },
 		           fields: fields {
 		           core: nil,
 		           eg: nil,
 		           kvs: nil,
-		           ivc: vcaches{},
-		           dvc: vcaches{},
+		           vq: nil,
 		           indexing: nil,
 		           saving: nil,
 		           lastNoice: 0,
-		           ic: 0,
 		           nocie: 0,
 		           nogce: 0,
 		           inMem: false,
@@ -4381,10 +4196,10 @@ func Test_ngt_IsIndexing(t *testing.T) {
 			tt.Parallel()
 			defer goleak.VerifyNone(tt, goleak.IgnoreCurrent())
 			if test.beforeFunc != nil {
-				test.beforeFunc()
+				test.beforeFunc(test.args)
 			}
 			if test.afterFunc != nil {
-				defer test.afterFunc()
+				defer test.afterFunc(test.args)
 			}
 			if test.checkFunc == nil {
 				test.checkFunc = defaultCheckFunc
@@ -4393,12 +4208,10 @@ func Test_ngt_IsIndexing(t *testing.T) {
 				core:              test.fields.core,
 				eg:                test.fields.eg,
 				kvs:               test.fields.kvs,
-				ivc:               test.fields.ivc,
-				dvc:               test.fields.dvc,
+				vq:                test.fields.vq,
 				indexing:          test.fields.indexing,
 				saving:            test.fields.saving,
 				lastNoice:         test.fields.lastNoice,
-				ic:                test.fields.ic,
 				nocie:             test.fields.nocie,
 				nogce:             test.fields.nogce,
 				inMem:             test.fields.inMem,
@@ -4418,29 +4231,24 @@ func Test_ngt_IsIndexing(t *testing.T) {
 				dcd:               test.fields.dcd,
 			}
 
-			got := n.IsIndexing()
-			if err := test.checkFunc(test.want, got); err != nil {
+			gotUuids := n.UUIDs(test.args.ctx)
+			if err := test.checkFunc(test.want, gotUuids); err != nil {
 				tt.Errorf("error = %v", err)
 			}
 		})
 	}
 }
 
-func Test_ngt_UUIDs(t *testing.T) {
+func Test_ngt_NumberOfCreateIndexExecution(t *testing.T) {
 	t.Parallel()
-	type args struct {
-		ctx context.Context
-	}
 	type fields struct {
 		core              core.NGT
 		eg                errgroup.Group
 		kvs               kvs.BidiMap
-		ivc               *vcaches
-		dvc               *vcaches
+		vq                vqueue.Queue
 		indexing          atomic.Value
 		saving            atomic.Value
 		lastNoice         uint64
-		ic                uint64
 		nocie             uint64
 		nogce             uint64
 		inMem             bool
@@ -4460,20 +4268,19 @@ func Test_ngt_UUIDs(t *testing.T) {
 		dcd               bool
 	}
 	type want struct {
-		wantUuids []string
+		want uint64
 	}
 	type test struct {
 		name       string
-		args       args
 		fields     fields
 		want       want
-		checkFunc  func(want, []string) error
-		beforeFunc func(args)
-		afterFunc  func(args)
+		checkFunc  func(want, uint64) error
+		beforeFunc func()
+		afterFunc  func()
 	}
-	defaultCheckFunc := func(w want, gotUuids []string) error {
-		if !reflect.DeepEqual(gotUuids, w.wantUuids) {
-			return errors.Errorf("got: \"%#v\",\n\t\t\t\twant: \"%#v\"", gotUuids, w.wantUuids)
+	defaultCheckFunc := func(w want, got uint64) error {
+		if !reflect.DeepEqual(got, w.want) {
+			return errors.Errorf("got: \"%#v\",\n\t\t\t\twant: \"%#v\"", got, w.want)
 		}
 		return nil
 	}
@@ -4482,19 +4289,14 @@ func Test_ngt_UUIDs(t *testing.T) {
 		/*
 		   {
 		       name: "test_case_1",
-		       args: args {
-		           ctx: nil,
-		       },
 		       fields: fields {
 		           core: nil,
 		           eg: nil,
 		           kvs: nil,
-		           ivc: vcaches{},
-		           dvc: vcaches{},
+		           vq: nil,
 		           indexing: nil,
 		           saving: nil,
 		           lastNoice: 0,
-		           ic: 0,
 		           nocie: 0,
 		           nogce: 0,
 		           inMem: false,
@@ -4523,19 +4325,14 @@ func Test_ngt_UUIDs(t *testing.T) {
 		   func() test {
 		       return test {
 		           name: "test_case_2",
-		           args: args {
-		           ctx: nil,
-		           },
 		           fields: fields {
 		           core: nil,
 		           eg: nil,
 		           kvs: nil,
-		           ivc: vcaches{},
-		           dvc: vcaches{},
+		           vq: nil,
 		           indexing: nil,
 		           saving: nil,
 		           lastNoice: 0,
-		           ic: 0,
 		           nocie: 0,
 		           nogce: 0,
 		           inMem: false,
@@ -4567,10 +4364,10 @@ func Test_ngt_UUIDs(t *testing.T) {
 			tt.Parallel()
 			defer goleak.VerifyNone(tt, goleak.IgnoreCurrent())
 			if test.beforeFunc != nil {
-				test.beforeFunc(test.args)
+				test.beforeFunc()
 			}
 			if test.afterFunc != nil {
-				defer test.afterFunc(test.args)
+				defer test.afterFunc()
 			}
 			if test.checkFunc == nil {
 				test.checkFunc = defaultCheckFunc
@@ -4579,12 +4376,10 @@ func Test_ngt_UUIDs(t *testing.T) {
 				core:              test.fields.core,
 				eg:                test.fields.eg,
 				kvs:               test.fields.kvs,
-				ivc:               test.fields.ivc,
-				dvc:               test.fields.dvc,
+				vq:                test.fields.vq,
 				indexing:          test.fields.indexing,
 				saving:            test.fields.saving,
 				lastNoice:         test.fields.lastNoice,
-				ic:                test.fields.ic,
 				nocie:             test.fields.nocie,
 				nogce:             test.fields.nogce,
 				inMem:             test.fields.inMem,
@@ -4604,26 +4399,24 @@ func Test_ngt_UUIDs(t *testing.T) {
 				dcd:               test.fields.dcd,
 			}
 
-			gotUuids := n.UUIDs(test.args.ctx)
-			if err := test.checkFunc(test.want, gotUuids); err != nil {
+			got := n.NumberOfCreateIndexExecution()
+			if err := test.checkFunc(test.want, got); err != nil {
 				tt.Errorf("error = %v", err)
 			}
 		})
 	}
 }
 
-func Test_ngt_UncommittedUUIDs(t *testing.T) {
+func Test_ngt_NumberOfProactiveGCExecution(t *testing.T) {
 	t.Parallel()
 	type fields struct {
 		core              core.NGT
 		eg                errgroup.Group
 		kvs               kvs.BidiMap
-		ivc               *vcaches
-		dvc               *vcaches
+		vq                vqueue.Queue
 		indexing          atomic.Value
 		saving            atomic.Value
 		lastNoice         uint64
-		ic                uint64
 		nocie             uint64
 		nogce             uint64
 		inMem             bool
@@ -4643,19 +4436,19 @@ func Test_ngt_UncommittedUUIDs(t *testing.T) {
 		dcd               bool
 	}
 	type want struct {
-		wantUuids []string
+		want uint64
 	}
 	type test struct {
 		name       string
 		fields     fields
 		want       want
-		checkFunc  func(want, []string) error
+		checkFunc  func(want, uint64) error
 		beforeFunc func()
 		afterFunc  func()
 	}
-	defaultCheckFunc := func(w want, gotUuids []string) error {
-		if !reflect.DeepEqual(gotUuids, w.wantUuids) {
-			return errors.Errorf("got: \"%#v\",\n\t\t\t\twant: \"%#v\"", gotUuids, w.wantUuids)
+	defaultCheckFunc := func(w want, got uint64) error {
+		if !reflect.DeepEqual(got, w.want) {
+			return errors.Errorf("got: \"%#v\",\n\t\t\t\twant: \"%#v\"", got, w.want)
 		}
 		return nil
 	}
@@ -4668,12 +4461,10 @@ func Test_ngt_UncommittedUUIDs(t *testing.T) {
 		           core: nil,
 		           eg: nil,
 		           kvs: nil,
-		           ivc: vcaches{},
-		           dvc: vcaches{},
+		           vq: nil,
 		           indexing: nil,
 		           saving: nil,
 		           lastNoice: 0,
-		           ic: 0,
 		           nocie: 0,
 		           nogce: 0,
 		           inMem: false,
@@ -4706,12 +4497,10 @@ func Test_ngt_UncommittedUUIDs(t *testing.T) {
 		           core: nil,
 		           eg: nil,
 		           kvs: nil,
-		           ivc: vcaches{},
-		           dvc: vcaches{},
+		           vq: nil,
 		           indexing: nil,
 		           saving: nil,
 		           lastNoice: 0,
-		           ic: 0,
 		           nocie: 0,
 		           nogce: 0,
 		           inMem: false,
@@ -4755,12 +4544,10 @@ func Test_ngt_UncommittedUUIDs(t *testing.T) {
 				core:              test.fields.core,
 				eg:                test.fields.eg,
 				kvs:               test.fields.kvs,
-				ivc:               test.fields.ivc,
-				dvc:               test.fields.dvc,
+				vq:                test.fields.vq,
 				indexing:          test.fields.indexing,
 				saving:            test.fields.saving,
 				lastNoice:         test.fields.lastNoice,
-				ic:                test.fields.ic,
 				nocie:             test.fields.nocie,
 				nogce:             test.fields.nogce,
 				inMem:             test.fields.inMem,
@@ -4780,26 +4567,24 @@ func Test_ngt_UncommittedUUIDs(t *testing.T) {
 				dcd:               test.fields.dcd,
 			}
 
-			gotUuids := n.UncommittedUUIDs()
-			if err := test.checkFunc(test.want, gotUuids); err != nil {
+			got := n.NumberOfProactiveGCExecution()
+			if err := test.checkFunc(test.want, got); err != nil {
 				tt.Errorf("error = %v", err)
 			}
 		})
 	}
 }
 
-func Test_ngt_NumberOfCreateIndexExecution(t *testing.T) {
+func Test_ngt_gc(t *testing.T) {
 	t.Parallel()
 	type fields struct {
 		core              core.NGT
 		eg                errgroup.Group
 		kvs               kvs.BidiMap
-		ivc               *vcaches
-		dvc               *vcaches
+		vq                vqueue.Queue
 		indexing          atomic.Value
 		saving            atomic.Value
 		lastNoice         uint64
-		ic                uint64
 		nocie             uint64
 		nogce             uint64
 		inMem             bool
@@ -4818,21 +4603,16 @@ func Test_ngt_NumberOfCreateIndexExecution(t *testing.T) {
 		idelay            time.Duration
 		dcd               bool
 	}
-	type want struct {
-		want uint64
-	}
+	type want struct{}
 	type test struct {
 		name       string
 		fields     fields
 		want       want
-		checkFunc  func(want, uint64) error
+		checkFunc  func(want) error
 		beforeFunc func()
 		afterFunc  func()
 	}
-	defaultCheckFunc := func(w want, got uint64) error {
-		if !reflect.DeepEqual(got, w.want) {
-			return errors.Errorf("got: \"%#v\",\n\t\t\t\twant: \"%#v\"", got, w.want)
-		}
+	defaultCheckFunc := func(w want) error {
 		return nil
 	}
 	tests := []test{
@@ -4844,12 +4624,10 @@ func Test_ngt_NumberOfCreateIndexExecution(t *testing.T) {
 		           core: nil,
 		           eg: nil,
 		           kvs: nil,
-		           ivc: vcaches{},
-		           dvc: vcaches{},
+		           vq: nil,
 		           indexing: nil,
 		           saving: nil,
 		           lastNoice: 0,
-		           ic: 0,
 		           nocie: 0,
 		           nogce: 0,
 		           inMem: false,
@@ -4882,12 +4660,10 @@ func Test_ngt_NumberOfCreateIndexExecution(t *testing.T) {
 		           core: nil,
 		           eg: nil,
 		           kvs: nil,
-		           ivc: vcaches{},
-		           dvc: vcaches{},
+		           vq: nil,
 		           indexing: nil,
 		           saving: nil,
 		           lastNoice: 0,
-		           ic: 0,
 		           nocie: 0,
 		           nogce: 0,
 		           inMem: false,
@@ -4931,12 +4707,10 @@ func Test_ngt_NumberOfCreateIndexExecution(t *testing.T) {
 				core:              test.fields.core,
 				eg:                test.fields.eg,
 				kvs:               test.fields.kvs,
-				ivc:               test.fields.ivc,
-				dvc:               test.fields.dvc,
+				vq:                test.fields.vq,
 				indexing:          test.fields.indexing,
 				saving:            test.fields.saving,
 				lastNoice:         test.fields.lastNoice,
-				ic:                test.fields.ic,
 				nocie:             test.fields.nocie,
 				nogce:             test.fields.nogce,
 				inMem:             test.fields.inMem,
@@ -4956,26 +4730,24 @@ func Test_ngt_NumberOfCreateIndexExecution(t *testing.T) {
 				dcd:               test.fields.dcd,
 			}
 
-			got := n.NumberOfCreateIndexExecution()
-			if err := test.checkFunc(test.want, got); err != nil {
+			n.gc()
+			if err := test.checkFunc(test.want); err != nil {
 				tt.Errorf("error = %v", err)
 			}
 		})
 	}
 }
 
-func Test_ngt_NumberOfProactiveGCExecution(t *testing.T) {
+func Test_ngt_Len(t *testing.T) {
 	t.Parallel()
 	type fields struct {
 		core              core.NGT
 		eg                errgroup.Group
 		kvs               kvs.BidiMap
-		ivc               *vcaches
-		dvc               *vcaches
+		vq                vqueue.Queue
 		indexing          atomic.Value
 		saving            atomic.Value
 		lastNoice         uint64
-		ic                uint64
 		nocie             uint64
 		nogce             uint64
 		inMem             bool
@@ -5020,12 +4792,10 @@ func Test_ngt_NumberOfProactiveGCExecution(t *testing.T) {
 		           core: nil,
 		           eg: nil,
 		           kvs: nil,
-		           ivc: vcaches{},
-		           dvc: vcaches{},
+		           vq: nil,
 		           indexing: nil,
 		           saving: nil,
 		           lastNoice: 0,
-		           ic: 0,
 		           nocie: 0,
 		           nogce: 0,
 		           inMem: false,
@@ -5058,12 +4828,10 @@ func Test_ngt_NumberOfProactiveGCExecution(t *testing.T) {
 		           core: nil,
 		           eg: nil,
 		           kvs: nil,
-		           ivc: vcaches{},
-		           dvc: vcaches{},
+		           vq: nil,
 		           indexing: nil,
 		           saving: nil,
 		           lastNoice: 0,
-		           ic: 0,
 		           nocie: 0,
 		           nogce: 0,
 		           inMem: false,
@@ -5107,12 +4875,10 @@ func Test_ngt_NumberOfProactiveGCExecution(t *testing.T) {
 				core:              test.fields.core,
 				eg:                test.fields.eg,
 				kvs:               test.fields.kvs,
-				ivc:               test.fields.ivc,
-				dvc:               test.fields.dvc,
+				vq:                test.fields.vq,
 				indexing:          test.fields.indexing,
 				saving:            test.fields.saving,
 				lastNoice:         test.fields.lastNoice,
-				ic:                test.fields.ic,
 				nocie:             test.fields.nocie,
 				nogce:             test.fields.nogce,
 				inMem:             test.fields.inMem,
@@ -5132,7 +4898,7 @@ func Test_ngt_NumberOfProactiveGCExecution(t *testing.T) {
 				dcd:               test.fields.dcd,
 			}
 
-			got := n.NumberOfProactiveGCExecution()
+			got := n.Len()
 			if err := test.checkFunc(test.want, got); err != nil {
 				tt.Errorf("error = %v", err)
 			}
@@ -5140,18 +4906,16 @@ func Test_ngt_NumberOfProactiveGCExecution(t *testing.T) {
 	}
 }
 
-func Test_ngt_gc(t *testing.T) {
+func Test_ngt_InsertVQueueBufferLen(t *testing.T) {
 	t.Parallel()
 	type fields struct {
 		core              core.NGT
 		eg                errgroup.Group
 		kvs               kvs.BidiMap
-		ivc               *vcaches
-		dvc               *vcaches
+		vq                vqueue.Queue
 		indexing          atomic.Value
 		saving            atomic.Value
 		lastNoice         uint64
-		ic                uint64
 		nocie             uint64
 		nogce             uint64
 		inMem             bool
@@ -5170,16 +4934,21 @@ func Test_ngt_gc(t *testing.T) {
 		idelay            time.Duration
 		dcd               bool
 	}
-	type want struct{}
+	type want struct {
+		want uint64
+	}
 	type test struct {
 		name       string
 		fields     fields
 		want       want
-		checkFunc  func(want) error
+		checkFunc  func(want, uint64) error
 		beforeFunc func()
 		afterFunc  func()
 	}
-	defaultCheckFunc := func(w want) error {
+	defaultCheckFunc := func(w want, got uint64) error {
+		if !reflect.DeepEqual(got, w.want) {
+			return errors.Errorf("got: \"%#v\",\n\t\t\t\twant: \"%#v\"", got, w.want)
+		}
 		return nil
 	}
 	tests := []test{
@@ -5191,12 +4960,10 @@ func Test_ngt_gc(t *testing.T) {
 		           core: nil,
 		           eg: nil,
 		           kvs: nil,
-		           ivc: vcaches{},
-		           dvc: vcaches{},
+		           vq: nil,
 		           indexing: nil,
 		           saving: nil,
 		           lastNoice: 0,
-		           ic: 0,
 		           nocie: 0,
 		           nogce: 0,
 		           inMem: false,
@@ -5229,12 +4996,10 @@ func Test_ngt_gc(t *testing.T) {
 		           core: nil,
 		           eg: nil,
 		           kvs: nil,
-		           ivc: vcaches{},
-		           dvc: vcaches{},
+		           vq: nil,
 		           indexing: nil,
 		           saving: nil,
 		           lastNoice: 0,
-		           ic: 0,
 		           nocie: 0,
 		           nogce: 0,
 		           inMem: false,
@@ -5278,12 +5043,10 @@ func Test_ngt_gc(t *testing.T) {
 				core:              test.fields.core,
 				eg:                test.fields.eg,
 				kvs:               test.fields.kvs,
-				ivc:               test.fields.ivc,
-				dvc:               test.fields.dvc,
+				vq:                test.fields.vq,
 				indexing:          test.fields.indexing,
 				saving:            test.fields.saving,
 				lastNoice:         test.fields.lastNoice,
-				ic:                test.fields.ic,
 				nocie:             test.fields.nocie,
 				nogce:             test.fields.nogce,
 				inMem:             test.fields.inMem,
@@ -5303,26 +5066,24 @@ func Test_ngt_gc(t *testing.T) {
 				dcd:               test.fields.dcd,
 			}
 
-			n.gc()
-			if err := test.checkFunc(test.want); err != nil {
+			got := n.InsertVQueueBufferLen()
+			if err := test.checkFunc(test.want, got); err != nil {
 				tt.Errorf("error = %v", err)
 			}
 		})
 	}
 }
 
-func Test_ngt_Len(t *testing.T) {
+func Test_ngt_DeleteVQueueBufferLen(t *testing.T) {
 	t.Parallel()
 	type fields struct {
 		core              core.NGT
 		eg                errgroup.Group
 		kvs               kvs.BidiMap
-		ivc               *vcaches
-		dvc               *vcaches
+		vq                vqueue.Queue
 		indexing          atomic.Value
 		saving            atomic.Value
 		lastNoice         uint64
-		ic                uint64
 		nocie             uint64
 		nogce             uint64
 		inMem             bool
@@ -5367,12 +5128,10 @@ func Test_ngt_Len(t *testing.T) {
 		           core: nil,
 		           eg: nil,
 		           kvs: nil,
-		           ivc: vcaches{},
-		           dvc: vcaches{},
+		           vq: nil,
 		           indexing: nil,
 		           saving: nil,
 		           lastNoice: 0,
-		           ic: 0,
 		           nocie: 0,
 		           nogce: 0,
 		           inMem: false,
@@ -5405,12 +5164,10 @@ func Test_ngt_Len(t *testing.T) {
 		           core: nil,
 		           eg: nil,
 		           kvs: nil,
-		           ivc: vcaches{},
-		           dvc: vcaches{},
+		           vq: nil,
 		           indexing: nil,
 		           saving: nil,
 		           lastNoice: 0,
-		           ic: 0,
 		           nocie: 0,
 		           nogce: 0,
 		           inMem: false,
@@ -5454,12 +5211,10 @@ func Test_ngt_Len(t *testing.T) {
 				core:              test.fields.core,
 				eg:                test.fields.eg,
 				kvs:               test.fields.kvs,
-				ivc:               test.fields.ivc,
-				dvc:               test.fields.dvc,
+				vq:                test.fields.vq,
 				indexing:          test.fields.indexing,
 				saving:            test.fields.saving,
 				lastNoice:         test.fields.lastNoice,
-				ic:                test.fields.ic,
 				nocie:             test.fields.nocie,
 				nogce:             test.fields.nogce,
 				inMem:             test.fields.inMem,
@@ -5479,7 +5234,7 @@ func Test_ngt_Len(t *testing.T) {
 				dcd:               test.fields.dcd,
 			}
 
-			got := n.Len()
+			got := n.DeleteVQueueBufferLen()
 			if err := test.checkFunc(test.want, got); err != nil {
 				tt.Errorf("error = %v", err)
 			}
@@ -5487,18 +5242,16 @@ func Test_ngt_Len(t *testing.T) {
 	}
 }
 
-func Test_ngt_InsertVCacheLen(t *testing.T) {
+func Test_ngt_InsertVQueueChannelLen(t *testing.T) {
 	t.Parallel()
 	type fields struct {
 		core              core.NGT
 		eg                errgroup.Group
 		kvs               kvs.BidiMap
-		ivc               *vcaches
-		dvc               *vcaches
+		vq                vqueue.Queue
 		indexing          atomic.Value
 		saving            atomic.Value
 		lastNoice         uint64
-		ic                uint64
 		nocie             uint64
 		nogce             uint64
 		inMem             bool
@@ -5543,12 +5296,10 @@ func Test_ngt_InsertVCacheLen(t *testing.T) {
 		           core: nil,
 		           eg: nil,
 		           kvs: nil,
-		           ivc: vcaches{},
-		           dvc: vcaches{},
+		           vq: nil,
 		           indexing: nil,
 		           saving: nil,
 		           lastNoice: 0,
-		           ic: 0,
 		           nocie: 0,
 		           nogce: 0,
 		           inMem: false,
@@ -5581,12 +5332,10 @@ func Test_ngt_InsertVCacheLen(t *testing.T) {
 		           core: nil,
 		           eg: nil,
 		           kvs: nil,
-		           ivc: vcaches{},
-		           dvc: vcaches{},
+		           vq: nil,
 		           indexing: nil,
 		           saving: nil,
 		           lastNoice: 0,
-		           ic: 0,
 		           nocie: 0,
 		           nogce: 0,
 		           inMem: false,
@@ -5630,12 +5379,10 @@ func Test_ngt_InsertVCacheLen(t *testing.T) {
 				core:              test.fields.core,
 				eg:                test.fields.eg,
 				kvs:               test.fields.kvs,
-				ivc:               test.fields.ivc,
-				dvc:               test.fields.dvc,
+				vq:                test.fields.vq,
 				indexing:          test.fields.indexing,
 				saving:            test.fields.saving,
 				lastNoice:         test.fields.lastNoice,
-				ic:                test.fields.ic,
 				nocie:             test.fields.nocie,
 				nogce:             test.fields.nogce,
 				inMem:             test.fields.inMem,
@@ -5655,7 +5402,7 @@ func Test_ngt_InsertVCacheLen(t *testing.T) {
 				dcd:               test.fields.dcd,
 			}
 
-			got := n.InsertVCacheLen()
+			got := n.InsertVQueueChannelLen()
 			if err := test.checkFunc(test.want, got); err != nil {
 				tt.Errorf("error = %v", err)
 			}
@@ -5663,18 +5410,16 @@ func Test_ngt_InsertVCacheLen(t *testing.T) {
 	}
 }
 
-func Test_ngt_DeleteVCacheLen(t *testing.T) {
+func Test_ngt_DeleteVQueueChannelLen(t *testing.T) {
 	t.Parallel()
 	type fields struct {
 		core              core.NGT
 		eg                errgroup.Group
 		kvs               kvs.BidiMap
-		ivc               *vcaches
-		dvc               *vcaches
+		vq                vqueue.Queue
 		indexing          atomic.Value
 		saving            atomic.Value
 		lastNoice         uint64
-		ic                uint64
 		nocie             uint64
 		nogce             uint64
 		inMem             bool
@@ -5719,12 +5464,10 @@ func Test_ngt_DeleteVCacheLen(t *testing.T) {
 		           core: nil,
 		           eg: nil,
 		           kvs: nil,
-		           ivc: vcaches{},
-		           dvc: vcaches{},
+		           vq: nil,
 		           indexing: nil,
 		           saving: nil,
 		           lastNoice: 0,
-		           ic: 0,
 		           nocie: 0,
 		           nogce: 0,
 		           inMem: false,
@@ -5757,12 +5500,10 @@ func Test_ngt_DeleteVCacheLen(t *testing.T) {
 		           core: nil,
 		           eg: nil,
 		           kvs: nil,
-		           ivc: vcaches{},
-		           dvc: vcaches{},
+		           vq: nil,
 		           indexing: nil,
 		           saving: nil,
 		           lastNoice: 0,
-		           ic: 0,
 		           nocie: 0,
 		           nogce: 0,
 		           inMem: false,
@@ -5806,12 +5547,10 @@ func Test_ngt_DeleteVCacheLen(t *testing.T) {
 				core:              test.fields.core,
 				eg:                test.fields.eg,
 				kvs:               test.fields.kvs,
-				ivc:               test.fields.ivc,
-				dvc:               test.fields.dvc,
+				vq:                test.fields.vq,
 				indexing:          test.fields.indexing,
 				saving:            test.fields.saving,
 				lastNoice:         test.fields.lastNoice,
-				ic:                test.fields.ic,
 				nocie:             test.fields.nocie,
 				nogce:             test.fields.nogce,
 				inMem:             test.fields.inMem,
@@ -5831,7 +5570,7 @@ func Test_ngt_DeleteVCacheLen(t *testing.T) {
 				dcd:               test.fields.dcd,
 			}
 
-			got := n.DeleteVCacheLen()
+			got := n.DeleteVQueueChannelLen()
 			if err := test.checkFunc(test.want, got); err != nil {
 				tt.Errorf("error = %v", err)
 			}
@@ -5848,12 +5587,10 @@ func Test_ngt_Close(t *testing.T) {
 		core              core.NGT
 		eg                errgroup.Group
 		kvs               kvs.BidiMap
-		ivc               *vcaches
-		dvc               *vcaches
+		vq                vqueue.Queue
 		indexing          atomic.Value
 		saving            atomic.Value
 		lastNoice         uint64
-		ic                uint64
 		nocie             uint64
 		nogce             uint64
 		inMem             bool
@@ -5902,12 +5639,10 @@ func Test_ngt_Close(t *testing.T) {
 		           core: nil,
 		           eg: nil,
 		           kvs: nil,
-		           ivc: vcaches{},
-		           dvc: vcaches{},
+		           vq: nil,
 		           indexing: nil,
 		           saving: nil,
 		           lastNoice: 0,
-		           ic: 0,
 		           nocie: 0,
 		           nogce: 0,
 		           inMem: false,
@@ -5943,12 +5678,10 @@ func Test_ngt_Close(t *testing.T) {
 		           core: nil,
 		           eg: nil,
 		           kvs: nil,
-		           ivc: vcaches{},
-		           dvc: vcaches{},
+		           vq: nil,
 		           indexing: nil,
 		           saving: nil,
 		           lastNoice: 0,
-		           ic: 0,
 		           nocie: 0,
 		           nogce: 0,
 		           inMem: false,
@@ -5992,12 +5725,10 @@ func Test_ngt_Close(t *testing.T) {
 				core:              test.fields.core,
 				eg:                test.fields.eg,
 				kvs:               test.fields.kvs,
-				ivc:               test.fields.ivc,
-				dvc:               test.fields.dvc,
+				vq:                test.fields.vq,
 				indexing:          test.fields.indexing,
 				saving:            test.fields.saving,
 				lastNoice:         test.fields.lastNoice,
-				ic:                test.fields.ic,
 				nocie:             test.fields.nocie,
 				nogce:             test.fields.nogce,
 				inMem:             test.fields.inMem,
diff --git a/pkg/agent/core/ngt/service/vcaches.go b/pkg/agent/core/ngt/service/vcaches.go
deleted file mode 100644
index bbeb77fa7a..0000000000
--- a/pkg/agent/core/ngt/service/vcaches.go
+++ /dev/null
@@ -1,213 +0,0 @@
-//
-// Copyright (C) 2019-2021 vdaas.org vald team <vald@vdaas.org>
-//
-// Licensed under the Apache License, Version 2.0 (the "License");
-// you may not use this file except in compliance with the License.
-// You may obtain a copy of the License at
-//
-//    https://www.apache.org/licenses/LICENSE-2.0
-//
-// Unless required by applicable law or agreed to in writing, software
-// distributed under the License is distributed on an "AS IS" BASIS,
-// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
-// See the License for the specific language governing permissions and
-// limitations under the License.
-//
-
-package service
-
-import (
-	"sync"
-	"sync/atomic"
-	"unsafe"
-)
-
-type vcaches struct {
-	length uint64
-	mu     sync.Mutex
-	read   atomic.Value // readOnly
-	dirty  map[string]*entryVCache
-	misses int
-}
-
-type readOnlyVCache struct {
-	m       map[string]*entryVCache
-	amended bool
-}
-
-var expungedVCache = unsafe.Pointer(new(vcache))
-
-type entryVCache struct {
-	p unsafe.Pointer
-}
-
-func newEntryVCache(i vcache) *entryVCache {
-	return &entryVCache{p: unsafe.Pointer(&i)}
-}
-
-func (m *vcaches) Load(key string) (value vcache, ok bool) {
-	read, _ := m.read.Load().(readOnlyVCache)
-	e, ok := read.m[key]
-	if !ok && read.amended {
-		m.mu.Lock()
-		read, _ = m.read.Load().(readOnlyVCache)
-		e, ok = read.m[key]
-		if !ok && read.amended {
-			e, ok = m.dirty[key]
-			m.missLocked()
-		}
-		m.mu.Unlock()
-	}
-	if !ok {
-		return value, false
-	}
-	return e.load()
-}
-
-func (e *entryVCache) load() (value vcache, ok bool) {
-	p := atomic.LoadPointer(&e.p)
-	if p == nil || p == expungedVCache {
-		return value, false
-	}
-	return *(*vcache)(p), true
-}
-
-func (m *vcaches) Store(key string, value vcache) {
-	defer atomic.AddUint64(&m.length, 1)
-	read, _ := m.read.Load().(readOnlyVCache)
-	if e, ok := read.m[key]; ok && e.tryStore(&value) {
-		return
-	}
-
-	m.mu.Lock()
-	read, _ = m.read.Load().(readOnlyVCache)
-	if e, ok := read.m[key]; ok {
-		if e.unexpungeLocked() {
-			m.dirty[key] = e
-		}
-		e.storeLocked(&value)
-	} else if e, ok := m.dirty[key]; ok {
-		e.storeLocked(&value)
-	} else {
-		if !read.amended {
-			m.dirtyLocked()
-			m.read.Store(readOnlyVCache{m: read.m, amended: true})
-		}
-		m.dirty[key] = newEntryVCache(value)
-	}
-	m.mu.Unlock()
-}
-
-func (e *entryVCache) tryStore(i *vcache) bool {
-	for {
-		p := atomic.LoadPointer(&e.p)
-		if p == expungedVCache {
-			return false
-		}
-		if atomic.CompareAndSwapPointer(&e.p, p, unsafe.Pointer(i)) {
-			return true
-		}
-	}
-}
-
-func (e *entryVCache) unexpungeLocked() (wasExpunged bool) {
-	return atomic.CompareAndSwapPointer(&e.p, expungedVCache, nil)
-}
-
-func (e *entryVCache) storeLocked(i *vcache) {
-	atomic.StorePointer(&e.p, unsafe.Pointer(i))
-}
-
-func (m *vcaches) Delete(key string) {
-	atomic.AddUint64(&m.length, ^uint64(0))
-	read, _ := m.read.Load().(readOnlyVCache)
-	e, ok := read.m[key]
-	if !ok && read.amended {
-		m.mu.Lock()
-		read, _ = m.read.Load().(readOnlyVCache)
-		e, ok = read.m[key]
-		if !ok && read.amended {
-			delete(m.dirty, key)
-		}
-		m.mu.Unlock()
-	}
-	if ok {
-		e.delete()
-	}
-}
-
-func (e *entryVCache) delete() (hadValue bool) {
-	for {
-		p := atomic.LoadPointer(&e.p)
-		if p == nil || p == expungedVCache {
-			return false
-		}
-		if atomic.CompareAndSwapPointer(&e.p, p, nil) {
-			return true
-		}
-	}
-}
-
-func (m *vcaches) Range(f func(key string, value vcache) bool) {
-	read, _ := m.read.Load().(readOnlyVCache)
-	if read.amended {
-		m.mu.Lock()
-		read, _ = m.read.Load().(readOnlyVCache)
-		if read.amended {
-			read = readOnlyVCache{m: m.dirty}
-			m.read.Store(read)
-			m.dirty = nil
-			m.misses = 0
-		}
-		m.mu.Unlock()
-	}
-
-	for k, e := range read.m {
-		v, ok := e.load()
-		if !ok {
-			continue
-		}
-		if !f(k, v) {
-			break
-		}
-	}
-}
-
-func (m *vcaches) missLocked() {
-	m.misses++
-	if m.misses < len(m.dirty) {
-		return
-	}
-	m.read.Store(readOnlyVCache{m: m.dirty})
-	m.dirty = nil
-	m.misses = 0
-}
-
-func (m *vcaches) dirtyLocked() {
-	if m.dirty != nil {
-		return
-	}
-
-	read, _ := m.read.Load().(readOnlyVCache)
-	m.dirty = make(map[string]*entryVCache, len(read.m))
-	for k, e := range read.m {
-		if !e.tryExpungeLocked() {
-			m.dirty[k] = e
-		}
-	}
-}
-
-func (e *entryVCache) tryExpungeLocked() (isExpunged bool) {
-	p := atomic.LoadPointer(&e.p)
-	for p == nil {
-		if atomic.CompareAndSwapPointer(&e.p, nil, expungedVCache) {
-			return true
-		}
-		p = atomic.LoadPointer(&e.p)
-	}
-	return p == expungedVCache
-}
-
-func (m *vcaches) Len() uint64 {
-	return atomic.LoadUint64(&m.length)
-}
diff --git a/pkg/agent/core/ngt/service/vcaches_test.go b/pkg/agent/core/ngt/service/vcaches_test.go
deleted file mode 100644
index 6710e2c2c8..0000000000
--- a/pkg/agent/core/ngt/service/vcaches_test.go
+++ /dev/null
@@ -1,1242 +0,0 @@
-//
-// Copyright (C) 2019-2021 vdaas.org vald team <vald@vdaas.org>
-//
-// Licensed under the Apache License, Version 2.0 (the "License");
-// you may not use this file except in compliance with the License.
-// You may obtain a copy of the License at
-//
-//    https://www.apache.org/licenses/LICENSE-2.0
-//
-// Unless required by applicable law or agreed to in writing, software
-// distributed under the License is distributed on an "AS IS" BASIS,
-// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
-// See the License for the specific language governing permissions and
-// limitations under the License.
-//
-
-package service
-
-import (
-	"reflect"
-	"sync"
-	"sync/atomic"
-	"testing"
-	"unsafe"
-
-	"github.com/vdaas/vald/internal/errors"
-	"go.uber.org/goleak"
-)
-
-func Test_newEntryVCache(t *testing.T) {
-	t.Parallel()
-	type args struct {
-		i vcache
-	}
-	type want struct {
-		want *entryVCache
-	}
-	type test struct {
-		name       string
-		args       args
-		want       want
-		checkFunc  func(want, *entryVCache) error
-		beforeFunc func(args)
-		afterFunc  func(args)
-	}
-	defaultCheckFunc := func(w want, got *entryVCache) error {
-		if !reflect.DeepEqual(got, w.want) {
-			return errors.Errorf("got: \"%#v\",\n\t\t\t\twant: \"%#v\"", got, w.want)
-		}
-		return nil
-	}
-	tests := []test{
-		// TODO test cases
-		/*
-		   {
-		       name: "test_case_1",
-		       args: args {
-		           i: vcache{},
-		       },
-		       want: want{},
-		       checkFunc: defaultCheckFunc,
-		   },
-		*/
-
-		// TODO test cases
-		/*
-		   func() test {
-		       return test {
-		           name: "test_case_2",
-		           args: args {
-		           i: vcache{},
-		           },
-		           want: want{},
-		           checkFunc: defaultCheckFunc,
-		       }
-		   }(),
-		*/
-	}
-
-	for _, tc := range tests {
-		test := tc
-		t.Run(test.name, func(tt *testing.T) {
-			tt.Parallel()
-			defer goleak.VerifyNone(tt, goleak.IgnoreCurrent())
-			if test.beforeFunc != nil {
-				test.beforeFunc(test.args)
-			}
-			if test.afterFunc != nil {
-				defer test.afterFunc(test.args)
-			}
-			if test.checkFunc == nil {
-				test.checkFunc = defaultCheckFunc
-			}
-
-			got := newEntryVCache(test.args.i)
-			if err := test.checkFunc(test.want, got); err != nil {
-				tt.Errorf("error = %v", err)
-			}
-		})
-	}
-}
-
-func Test_vcaches_Load(t *testing.T) {
-	t.Parallel()
-	type args struct {
-		key string
-	}
-	type fields struct {
-		length uint64
-		mu     sync.Mutex
-		read   atomic.Value
-		dirty  map[string]*entryVCache
-		misses int
-	}
-	type want struct {
-		wantValue vcache
-		wantOk    bool
-	}
-	type test struct {
-		name       string
-		args       args
-		fields     fields
-		want       want
-		checkFunc  func(want, vcache, bool) error
-		beforeFunc func(args)
-		afterFunc  func(args)
-	}
-	defaultCheckFunc := func(w want, gotValue vcache, gotOk bool) error {
-		if !reflect.DeepEqual(gotValue, w.wantValue) {
-			return errors.Errorf("got: \"%#v\",\n\t\t\t\twant: \"%#v\"", gotValue, w.wantValue)
-		}
-		if !reflect.DeepEqual(gotOk, w.wantOk) {
-			return errors.Errorf("got: \"%#v\",\n\t\t\t\twant: \"%#v\"", gotOk, w.wantOk)
-		}
-		return nil
-	}
-	tests := []test{
-		// TODO test cases
-		/*
-		   {
-		       name: "test_case_1",
-		       args: args {
-		           key: "",
-		       },
-		       fields: fields {
-		           length: 0,
-		           mu: sync.Mutex{},
-		           read: nil,
-		           dirty: nil,
-		           misses: 0,
-		       },
-		       want: want{},
-		       checkFunc: defaultCheckFunc,
-		   },
-		*/
-
-		// TODO test cases
-		/*
-		   func() test {
-		       return test {
-		           name: "test_case_2",
-		           args: args {
-		           key: "",
-		           },
-		           fields: fields {
-		           length: 0,
-		           mu: sync.Mutex{},
-		           read: nil,
-		           dirty: nil,
-		           misses: 0,
-		           },
-		           want: want{},
-		           checkFunc: defaultCheckFunc,
-		       }
-		   }(),
-		*/
-	}
-
-	for _, tc := range tests {
-		test := tc
-		t.Run(test.name, func(tt *testing.T) {
-			tt.Parallel()
-			defer goleak.VerifyNone(tt, goleak.IgnoreCurrent())
-			if test.beforeFunc != nil {
-				test.beforeFunc(test.args)
-			}
-			if test.afterFunc != nil {
-				defer test.afterFunc(test.args)
-			}
-			if test.checkFunc == nil {
-				test.checkFunc = defaultCheckFunc
-			}
-			m := &vcaches{
-				length: test.fields.length,
-				mu:     test.fields.mu,
-				read:   test.fields.read,
-				dirty:  test.fields.dirty,
-				misses: test.fields.misses,
-			}
-
-			gotValue, gotOk := m.Load(test.args.key)
-			if err := test.checkFunc(test.want, gotValue, gotOk); err != nil {
-				tt.Errorf("error = %v", err)
-			}
-		})
-	}
-}
-
-func Test_entryVCache_load(t *testing.T) {
-	t.Parallel()
-	type fields struct {
-		p unsafe.Pointer
-	}
-	type want struct {
-		wantValue vcache
-		wantOk    bool
-	}
-	type test struct {
-		name       string
-		fields     fields
-		want       want
-		checkFunc  func(want, vcache, bool) error
-		beforeFunc func()
-		afterFunc  func()
-	}
-	defaultCheckFunc := func(w want, gotValue vcache, gotOk bool) error {
-		if !reflect.DeepEqual(gotValue, w.wantValue) {
-			return errors.Errorf("got: \"%#v\",\n\t\t\t\twant: \"%#v\"", gotValue, w.wantValue)
-		}
-		if !reflect.DeepEqual(gotOk, w.wantOk) {
-			return errors.Errorf("got: \"%#v\",\n\t\t\t\twant: \"%#v\"", gotOk, w.wantOk)
-		}
-		return nil
-	}
-	tests := []test{
-		// TODO test cases
-		/*
-		   {
-		       name: "test_case_1",
-		       fields: fields {
-		           p: nil,
-		       },
-		       want: want{},
-		       checkFunc: defaultCheckFunc,
-		   },
-		*/
-
-		// TODO test cases
-		/*
-		   func() test {
-		       return test {
-		           name: "test_case_2",
-		           fields: fields {
-		           p: nil,
-		           },
-		           want: want{},
-		           checkFunc: defaultCheckFunc,
-		       }
-		   }(),
-		*/
-	}
-
-	for _, tc := range tests {
-		test := tc
-		t.Run(test.name, func(tt *testing.T) {
-			tt.Parallel()
-			defer goleak.VerifyNone(tt, goleak.IgnoreCurrent())
-			if test.beforeFunc != nil {
-				test.beforeFunc()
-			}
-			if test.afterFunc != nil {
-				defer test.afterFunc()
-			}
-			if test.checkFunc == nil {
-				test.checkFunc = defaultCheckFunc
-			}
-			e := &entryVCache{
-				p: test.fields.p,
-			}
-
-			gotValue, gotOk := e.load()
-			if err := test.checkFunc(test.want, gotValue, gotOk); err != nil {
-				tt.Errorf("error = %v", err)
-			}
-		})
-	}
-}
-
-func Test_vcaches_Store(t *testing.T) {
-	t.Parallel()
-	type args struct {
-		key   string
-		value vcache
-	}
-	type fields struct {
-		length uint64
-		mu     sync.Mutex
-		read   atomic.Value
-		dirty  map[string]*entryVCache
-		misses int
-	}
-	type want struct{}
-	type test struct {
-		name       string
-		args       args
-		fields     fields
-		want       want
-		checkFunc  func(want) error
-		beforeFunc func(args)
-		afterFunc  func(args)
-	}
-	defaultCheckFunc := func(w want) error {
-		return nil
-	}
-	tests := []test{
-		// TODO test cases
-		/*
-		   {
-		       name: "test_case_1",
-		       args: args {
-		           key: "",
-		           value: vcache{},
-		       },
-		       fields: fields {
-		           length: 0,
-		           mu: sync.Mutex{},
-		           read: nil,
-		           dirty: nil,
-		           misses: 0,
-		       },
-		       want: want{},
-		       checkFunc: defaultCheckFunc,
-		   },
-		*/
-
-		// TODO test cases
-		/*
-		   func() test {
-		       return test {
-		           name: "test_case_2",
-		           args: args {
-		           key: "",
-		           value: vcache{},
-		           },
-		           fields: fields {
-		           length: 0,
-		           mu: sync.Mutex{},
-		           read: nil,
-		           dirty: nil,
-		           misses: 0,
-		           },
-		           want: want{},
-		           checkFunc: defaultCheckFunc,
-		       }
-		   }(),
-		*/
-	}
-
-	for _, tc := range tests {
-		test := tc
-		t.Run(test.name, func(tt *testing.T) {
-			tt.Parallel()
-			defer goleak.VerifyNone(tt, goleak.IgnoreCurrent())
-			if test.beforeFunc != nil {
-				test.beforeFunc(test.args)
-			}
-			if test.afterFunc != nil {
-				defer test.afterFunc(test.args)
-			}
-			if test.checkFunc == nil {
-				test.checkFunc = defaultCheckFunc
-			}
-			m := &vcaches{
-				length: test.fields.length,
-				mu:     test.fields.mu,
-				read:   test.fields.read,
-				dirty:  test.fields.dirty,
-				misses: test.fields.misses,
-			}
-
-			m.Store(test.args.key, test.args.value)
-			if err := test.checkFunc(test.want); err != nil {
-				tt.Errorf("error = %v", err)
-			}
-		})
-	}
-}
-
-func Test_entryVCache_tryStore(t *testing.T) {
-	t.Parallel()
-	type args struct {
-		i *vcache
-	}
-	type fields struct {
-		p unsafe.Pointer
-	}
-	type want struct {
-		want bool
-	}
-	type test struct {
-		name       string
-		args       args
-		fields     fields
-		want       want
-		checkFunc  func(want, bool) error
-		beforeFunc func(args)
-		afterFunc  func(args)
-	}
-	defaultCheckFunc := func(w want, got bool) error {
-		if !reflect.DeepEqual(got, w.want) {
-			return errors.Errorf("got: \"%#v\",\n\t\t\t\twant: \"%#v\"", got, w.want)
-		}
-		return nil
-	}
-	tests := []test{
-		// TODO test cases
-		/*
-		   {
-		       name: "test_case_1",
-		       args: args {
-		           i: vcache{},
-		       },
-		       fields: fields {
-		           p: nil,
-		       },
-		       want: want{},
-		       checkFunc: defaultCheckFunc,
-		   },
-		*/
-
-		// TODO test cases
-		/*
-		   func() test {
-		       return test {
-		           name: "test_case_2",
-		           args: args {
-		           i: vcache{},
-		           },
-		           fields: fields {
-		           p: nil,
-		           },
-		           want: want{},
-		           checkFunc: defaultCheckFunc,
-		       }
-		   }(),
-		*/
-	}
-
-	for _, tc := range tests {
-		test := tc
-		t.Run(test.name, func(tt *testing.T) {
-			tt.Parallel()
-			defer goleak.VerifyNone(tt, goleak.IgnoreCurrent())
-			if test.beforeFunc != nil {
-				test.beforeFunc(test.args)
-			}
-			if test.afterFunc != nil {
-				defer test.afterFunc(test.args)
-			}
-			if test.checkFunc == nil {
-				test.checkFunc = defaultCheckFunc
-			}
-			e := &entryVCache{
-				p: test.fields.p,
-			}
-
-			got := e.tryStore(test.args.i)
-			if err := test.checkFunc(test.want, got); err != nil {
-				tt.Errorf("error = %v", err)
-			}
-		})
-	}
-}
-
-func Test_entryVCache_unexpungeLocked(t *testing.T) {
-	t.Parallel()
-	type fields struct {
-		p unsafe.Pointer
-	}
-	type want struct {
-		wantWasExpunged bool
-	}
-	type test struct {
-		name       string
-		fields     fields
-		want       want
-		checkFunc  func(want, bool) error
-		beforeFunc func()
-		afterFunc  func()
-	}
-	defaultCheckFunc := func(w want, gotWasExpunged bool) error {
-		if !reflect.DeepEqual(gotWasExpunged, w.wantWasExpunged) {
-			return errors.Errorf("got: \"%#v\",\n\t\t\t\twant: \"%#v\"", gotWasExpunged, w.wantWasExpunged)
-		}
-		return nil
-	}
-	tests := []test{
-		// TODO test cases
-		/*
-		   {
-		       name: "test_case_1",
-		       fields: fields {
-		           p: nil,
-		       },
-		       want: want{},
-		       checkFunc: defaultCheckFunc,
-		   },
-		*/
-
-		// TODO test cases
-		/*
-		   func() test {
-		       return test {
-		           name: "test_case_2",
-		           fields: fields {
-		           p: nil,
-		           },
-		           want: want{},
-		           checkFunc: defaultCheckFunc,
-		       }
-		   }(),
-		*/
-	}
-
-	for _, tc := range tests {
-		test := tc
-		t.Run(test.name, func(tt *testing.T) {
-			tt.Parallel()
-			defer goleak.VerifyNone(tt, goleak.IgnoreCurrent())
-			if test.beforeFunc != nil {
-				test.beforeFunc()
-			}
-			if test.afterFunc != nil {
-				defer test.afterFunc()
-			}
-			if test.checkFunc == nil {
-				test.checkFunc = defaultCheckFunc
-			}
-			e := &entryVCache{
-				p: test.fields.p,
-			}
-
-			gotWasExpunged := e.unexpungeLocked()
-			if err := test.checkFunc(test.want, gotWasExpunged); err != nil {
-				tt.Errorf("error = %v", err)
-			}
-		})
-	}
-}
-
-func Test_entryVCache_storeLocked(t *testing.T) {
-	t.Parallel()
-	type args struct {
-		i *vcache
-	}
-	type fields struct {
-		p unsafe.Pointer
-	}
-	type want struct{}
-	type test struct {
-		name       string
-		args       args
-		fields     fields
-		want       want
-		checkFunc  func(want) error
-		beforeFunc func(args)
-		afterFunc  func(args)
-	}
-	defaultCheckFunc := func(w want) error {
-		return nil
-	}
-	tests := []test{
-		// TODO test cases
-		/*
-		   {
-		       name: "test_case_1",
-		       args: args {
-		           i: vcache{},
-		       },
-		       fields: fields {
-		           p: nil,
-		       },
-		       want: want{},
-		       checkFunc: defaultCheckFunc,
-		   },
-		*/
-
-		// TODO test cases
-		/*
-		   func() test {
-		       return test {
-		           name: "test_case_2",
-		           args: args {
-		           i: vcache{},
-		           },
-		           fields: fields {
-		           p: nil,
-		           },
-		           want: want{},
-		           checkFunc: defaultCheckFunc,
-		       }
-		   }(),
-		*/
-	}
-
-	for _, tc := range tests {
-		test := tc
-		t.Run(test.name, func(tt *testing.T) {
-			tt.Parallel()
-			defer goleak.VerifyNone(tt, goleak.IgnoreCurrent())
-			if test.beforeFunc != nil {
-				test.beforeFunc(test.args)
-			}
-			if test.afterFunc != nil {
-				defer test.afterFunc(test.args)
-			}
-			if test.checkFunc == nil {
-				test.checkFunc = defaultCheckFunc
-			}
-			e := &entryVCache{
-				p: test.fields.p,
-			}
-
-			e.storeLocked(test.args.i)
-			if err := test.checkFunc(test.want); err != nil {
-				tt.Errorf("error = %v", err)
-			}
-		})
-	}
-}
-
-func Test_vcaches_Delete(t *testing.T) {
-	t.Parallel()
-	type args struct {
-		key string
-	}
-	type fields struct {
-		length uint64
-		mu     sync.Mutex
-		read   atomic.Value
-		dirty  map[string]*entryVCache
-		misses int
-	}
-	type want struct{}
-	type test struct {
-		name       string
-		args       args
-		fields     fields
-		want       want
-		checkFunc  func(want) error
-		beforeFunc func(args)
-		afterFunc  func(args)
-	}
-	defaultCheckFunc := func(w want) error {
-		return nil
-	}
-	tests := []test{
-		// TODO test cases
-		/*
-		   {
-		       name: "test_case_1",
-		       args: args {
-		           key: "",
-		       },
-		       fields: fields {
-		           length: 0,
-		           mu: sync.Mutex{},
-		           read: nil,
-		           dirty: nil,
-		           misses: 0,
-		       },
-		       want: want{},
-		       checkFunc: defaultCheckFunc,
-		   },
-		*/
-
-		// TODO test cases
-		/*
-		   func() test {
-		       return test {
-		           name: "test_case_2",
-		           args: args {
-		           key: "",
-		           },
-		           fields: fields {
-		           length: 0,
-		           mu: sync.Mutex{},
-		           read: nil,
-		           dirty: nil,
-		           misses: 0,
-		           },
-		           want: want{},
-		           checkFunc: defaultCheckFunc,
-		       }
-		   }(),
-		*/
-	}
-
-	for _, tc := range tests {
-		test := tc
-		t.Run(test.name, func(tt *testing.T) {
-			tt.Parallel()
-			defer goleak.VerifyNone(tt, goleak.IgnoreCurrent())
-			if test.beforeFunc != nil {
-				test.beforeFunc(test.args)
-			}
-			if test.afterFunc != nil {
-				defer test.afterFunc(test.args)
-			}
-			if test.checkFunc == nil {
-				test.checkFunc = defaultCheckFunc
-			}
-			m := &vcaches{
-				length: test.fields.length,
-				mu:     test.fields.mu,
-				read:   test.fields.read,
-				dirty:  test.fields.dirty,
-				misses: test.fields.misses,
-			}
-
-			m.Delete(test.args.key)
-			if err := test.checkFunc(test.want); err != nil {
-				tt.Errorf("error = %v", err)
-			}
-		})
-	}
-}
-
-func Test_entryVCache_delete(t *testing.T) {
-	t.Parallel()
-	type fields struct {
-		p unsafe.Pointer
-	}
-	type want struct {
-		wantHadValue bool
-	}
-	type test struct {
-		name       string
-		fields     fields
-		want       want
-		checkFunc  func(want, bool) error
-		beforeFunc func()
-		afterFunc  func()
-	}
-	defaultCheckFunc := func(w want, gotHadValue bool) error {
-		if !reflect.DeepEqual(gotHadValue, w.wantHadValue) {
-			return errors.Errorf("got: \"%#v\",\n\t\t\t\twant: \"%#v\"", gotHadValue, w.wantHadValue)
-		}
-		return nil
-	}
-	tests := []test{
-		// TODO test cases
-		/*
-		   {
-		       name: "test_case_1",
-		       fields: fields {
-		           p: nil,
-		       },
-		       want: want{},
-		       checkFunc: defaultCheckFunc,
-		   },
-		*/
-
-		// TODO test cases
-		/*
-		   func() test {
-		       return test {
-		           name: "test_case_2",
-		           fields: fields {
-		           p: nil,
-		           },
-		           want: want{},
-		           checkFunc: defaultCheckFunc,
-		       }
-		   }(),
-		*/
-	}
-
-	for _, tc := range tests {
-		test := tc
-		t.Run(test.name, func(tt *testing.T) {
-			tt.Parallel()
-			defer goleak.VerifyNone(tt, goleak.IgnoreCurrent())
-			if test.beforeFunc != nil {
-				test.beforeFunc()
-			}
-			if test.afterFunc != nil {
-				defer test.afterFunc()
-			}
-			if test.checkFunc == nil {
-				test.checkFunc = defaultCheckFunc
-			}
-			e := &entryVCache{
-				p: test.fields.p,
-			}
-
-			gotHadValue := e.delete()
-			if err := test.checkFunc(test.want, gotHadValue); err != nil {
-				tt.Errorf("error = %v", err)
-			}
-		})
-	}
-}
-
-func Test_vcaches_Range(t *testing.T) {
-	t.Parallel()
-	type args struct {
-		f func(key string, value vcache) bool
-	}
-	type fields struct {
-		length uint64
-		mu     sync.Mutex
-		read   atomic.Value
-		dirty  map[string]*entryVCache
-		misses int
-	}
-	type want struct{}
-	type test struct {
-		name       string
-		args       args
-		fields     fields
-		want       want
-		checkFunc  func(want) error
-		beforeFunc func(args)
-		afterFunc  func(args)
-	}
-	defaultCheckFunc := func(w want) error {
-		return nil
-	}
-	tests := []test{
-		// TODO test cases
-		/*
-		   {
-		       name: "test_case_1",
-		       args: args {
-		           f: nil,
-		       },
-		       fields: fields {
-		           length: 0,
-		           mu: sync.Mutex{},
-		           read: nil,
-		           dirty: nil,
-		           misses: 0,
-		       },
-		       want: want{},
-		       checkFunc: defaultCheckFunc,
-		   },
-		*/
-
-		// TODO test cases
-		/*
-		   func() test {
-		       return test {
-		           name: "test_case_2",
-		           args: args {
-		           f: nil,
-		           },
-		           fields: fields {
-		           length: 0,
-		           mu: sync.Mutex{},
-		           read: nil,
-		           dirty: nil,
-		           misses: 0,
-		           },
-		           want: want{},
-		           checkFunc: defaultCheckFunc,
-		       }
-		   }(),
-		*/
-	}
-
-	for _, tc := range tests {
-		test := tc
-		t.Run(test.name, func(tt *testing.T) {
-			tt.Parallel()
-			defer goleak.VerifyNone(tt, goleak.IgnoreCurrent())
-			if test.beforeFunc != nil {
-				test.beforeFunc(test.args)
-			}
-			if test.afterFunc != nil {
-				defer test.afterFunc(test.args)
-			}
-			if test.checkFunc == nil {
-				test.checkFunc = defaultCheckFunc
-			}
-			m := &vcaches{
-				length: test.fields.length,
-				mu:     test.fields.mu,
-				read:   test.fields.read,
-				dirty:  test.fields.dirty,
-				misses: test.fields.misses,
-			}
-
-			m.Range(test.args.f)
-			if err := test.checkFunc(test.want); err != nil {
-				tt.Errorf("error = %v", err)
-			}
-		})
-	}
-}
-
-func Test_vcaches_missLocked(t *testing.T) {
-	t.Parallel()
-	type fields struct {
-		length uint64
-		mu     sync.Mutex
-		read   atomic.Value
-		dirty  map[string]*entryVCache
-		misses int
-	}
-	type want struct{}
-	type test struct {
-		name       string
-		fields     fields
-		want       want
-		checkFunc  func(want) error
-		beforeFunc func()
-		afterFunc  func()
-	}
-	defaultCheckFunc := func(w want) error {
-		return nil
-	}
-	tests := []test{
-		// TODO test cases
-		/*
-		   {
-		       name: "test_case_1",
-		       fields: fields {
-		           length: 0,
-		           mu: sync.Mutex{},
-		           read: nil,
-		           dirty: nil,
-		           misses: 0,
-		       },
-		       want: want{},
-		       checkFunc: defaultCheckFunc,
-		   },
-		*/
-
-		// TODO test cases
-		/*
-		   func() test {
-		       return test {
-		           name: "test_case_2",
-		           fields: fields {
-		           length: 0,
-		           mu: sync.Mutex{},
-		           read: nil,
-		           dirty: nil,
-		           misses: 0,
-		           },
-		           want: want{},
-		           checkFunc: defaultCheckFunc,
-		       }
-		   }(),
-		*/
-	}
-
-	for _, tc := range tests {
-		test := tc
-		t.Run(test.name, func(tt *testing.T) {
-			tt.Parallel()
-			defer goleak.VerifyNone(tt, goleak.IgnoreCurrent())
-			if test.beforeFunc != nil {
-				test.beforeFunc()
-			}
-			if test.afterFunc != nil {
-				defer test.afterFunc()
-			}
-			if test.checkFunc == nil {
-				test.checkFunc = defaultCheckFunc
-			}
-			m := &vcaches{
-				length: test.fields.length,
-				mu:     test.fields.mu,
-				read:   test.fields.read,
-				dirty:  test.fields.dirty,
-				misses: test.fields.misses,
-			}
-
-			m.missLocked()
-			if err := test.checkFunc(test.want); err != nil {
-				tt.Errorf("error = %v", err)
-			}
-		})
-	}
-}
-
-func Test_vcaches_dirtyLocked(t *testing.T) {
-	t.Parallel()
-	type fields struct {
-		length uint64
-		mu     sync.Mutex
-		read   atomic.Value
-		dirty  map[string]*entryVCache
-		misses int
-	}
-	type want struct{}
-	type test struct {
-		name       string
-		fields     fields
-		want       want
-		checkFunc  func(want) error
-		beforeFunc func()
-		afterFunc  func()
-	}
-	defaultCheckFunc := func(w want) error {
-		return nil
-	}
-	tests := []test{
-		// TODO test cases
-		/*
-		   {
-		       name: "test_case_1",
-		       fields: fields {
-		           length: 0,
-		           mu: sync.Mutex{},
-		           read: nil,
-		           dirty: nil,
-		           misses: 0,
-		       },
-		       want: want{},
-		       checkFunc: defaultCheckFunc,
-		   },
-		*/
-
-		// TODO test cases
-		/*
-		   func() test {
-		       return test {
-		           name: "test_case_2",
-		           fields: fields {
-		           length: 0,
-		           mu: sync.Mutex{},
-		           read: nil,
-		           dirty: nil,
-		           misses: 0,
-		           },
-		           want: want{},
-		           checkFunc: defaultCheckFunc,
-		       }
-		   }(),
-		*/
-	}
-
-	for _, tc := range tests {
-		test := tc
-		t.Run(test.name, func(tt *testing.T) {
-			tt.Parallel()
-			defer goleak.VerifyNone(tt, goleak.IgnoreCurrent())
-			if test.beforeFunc != nil {
-				test.beforeFunc()
-			}
-			if test.afterFunc != nil {
-				defer test.afterFunc()
-			}
-			if test.checkFunc == nil {
-				test.checkFunc = defaultCheckFunc
-			}
-			m := &vcaches{
-				length: test.fields.length,
-				mu:     test.fields.mu,
-				read:   test.fields.read,
-				dirty:  test.fields.dirty,
-				misses: test.fields.misses,
-			}
-
-			m.dirtyLocked()
-			if err := test.checkFunc(test.want); err != nil {
-				tt.Errorf("error = %v", err)
-			}
-		})
-	}
-}
-
-func Test_entryVCache_tryExpungeLocked(t *testing.T) {
-	t.Parallel()
-	type fields struct {
-		p unsafe.Pointer
-	}
-	type want struct {
-		wantIsExpunged bool
-	}
-	type test struct {
-		name       string
-		fields     fields
-		want       want
-		checkFunc  func(want, bool) error
-		beforeFunc func()
-		afterFunc  func()
-	}
-	defaultCheckFunc := func(w want, gotIsExpunged bool) error {
-		if !reflect.DeepEqual(gotIsExpunged, w.wantIsExpunged) {
-			return errors.Errorf("got: \"%#v\",\n\t\t\t\twant: \"%#v\"", gotIsExpunged, w.wantIsExpunged)
-		}
-		return nil
-	}
-	tests := []test{
-		// TODO test cases
-		/*
-		   {
-		       name: "test_case_1",
-		       fields: fields {
-		           p: nil,
-		       },
-		       want: want{},
-		       checkFunc: defaultCheckFunc,
-		   },
-		*/
-
-		// TODO test cases
-		/*
-		   func() test {
-		       return test {
-		           name: "test_case_2",
-		           fields: fields {
-		           p: nil,
-		           },
-		           want: want{},
-		           checkFunc: defaultCheckFunc,
-		       }
-		   }(),
-		*/
-	}
-
-	for _, tc := range tests {
-		test := tc
-		t.Run(test.name, func(tt *testing.T) {
-			tt.Parallel()
-			defer goleak.VerifyNone(tt, goleak.IgnoreCurrent())
-			if test.beforeFunc != nil {
-				test.beforeFunc()
-			}
-			if test.afterFunc != nil {
-				defer test.afterFunc()
-			}
-			if test.checkFunc == nil {
-				test.checkFunc = defaultCheckFunc
-			}
-			e := &entryVCache{
-				p: test.fields.p,
-			}
-
-			gotIsExpunged := e.tryExpungeLocked()
-			if err := test.checkFunc(test.want, gotIsExpunged); err != nil {
-				tt.Errorf("error = %v", err)
-			}
-		})
-	}
-}
-
-func Test_vcaches_Len(t *testing.T) {
-	t.Parallel()
-	type fields struct {
-		length uint64
-		mu     sync.Mutex
-		read   atomic.Value
-		dirty  map[string]*entryVCache
-		misses int
-	}
-	type want struct {
-		want uint64
-	}
-	type test struct {
-		name       string
-		fields     fields
-		want       want
-		checkFunc  func(want, uint64) error
-		beforeFunc func()
-		afterFunc  func()
-	}
-	defaultCheckFunc := func(w want, got uint64) error {
-		if !reflect.DeepEqual(got, w.want) {
-			return errors.Errorf("got: \"%#v\",\n\t\t\t\twant: \"%#v\"", got, w.want)
-		}
-		return nil
-	}
-	tests := []test{
-		// TODO test cases
-		/*
-		   {
-		       name: "test_case_1",
-		       fields: fields {
-		           length: 0,
-		           mu: sync.Mutex{},
-		           read: nil,
-		           dirty: nil,
-		           misses: 0,
-		       },
-		       want: want{},
-		       checkFunc: defaultCheckFunc,
-		   },
-		*/
-
-		// TODO test cases
-		/*
-		   func() test {
-		       return test {
-		           name: "test_case_2",
-		           fields: fields {
-		           length: 0,
-		           mu: sync.Mutex{},
-		           read: nil,
-		           dirty: nil,
-		           misses: 0,
-		           },
-		           want: want{},
-		           checkFunc: defaultCheckFunc,
-		       }
-		   }(),
-		*/
-	}
-
-	for _, tc := range tests {
-		test := tc
-		t.Run(test.name, func(tt *testing.T) {
-			tt.Parallel()
-			defer goleak.VerifyNone(tt, goleak.IgnoreCurrent())
-			if test.beforeFunc != nil {
-				test.beforeFunc()
-			}
-			if test.afterFunc != nil {
-				defer test.afterFunc()
-			}
-			if test.checkFunc == nil {
-				test.checkFunc = defaultCheckFunc
-			}
-			m := &vcaches{
-				length: test.fields.length,
-				mu:     test.fields.mu,
-				read:   test.fields.read,
-				dirty:  test.fields.dirty,
-				misses: test.fields.misses,
-			}
-
-			got := m.Len()
-			if err := test.checkFunc(test.want, got); err != nil {
-				tt.Errorf("error = %v", err)
-			}
-		})
-	}
-}
diff --git a/pkg/agent/core/ngt/service/vqueue/option.go b/pkg/agent/core/ngt/service/vqueue/option.go
new file mode 100644
index 0000000000..3aad6251f4
--- /dev/null
+++ b/pkg/agent/core/ngt/service/vqueue/option.go
@@ -0,0 +1,82 @@
+//
+// Copyright (C) 2019-2021 vdaas.org vald team <vald@vdaas.org>
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//    https://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+//
+
+// Package vqueue manages the vector cache layer for reducing FFI overhead for fast Agent processing.
+package vqueue
+
+import (
+	"github.com/vdaas/vald/internal/errgroup"
+)
+
+type Option func(n *vqueue) error
+
+var defaultOptions = []Option{
+	WithErrGroup(errgroup.Get()),
+	WithDeleteBufferPoolSize(1000),
+	WithInsertBufferPoolSize(1000),
+	WithDeleteBufferSize(100),
+	WithInsertBufferSize(100),
+}
+
+func WithErrGroup(eg errgroup.Group) Option {
+	return func(v *vqueue) error {
+		if eg != nil {
+			v.eg = eg
+		}
+
+		return nil
+	}
+}
+
+func WithInsertBufferSize(size int) Option {
+	return func(v *vqueue) error {
+		if size > 0 {
+			v.ichSize = size
+		}
+
+		return nil
+	}
+}
+
+func WithDeleteBufferSize(size int) Option {
+	return func(v *vqueue) error {
+		if size > 0 {
+			v.dchSize = size
+		}
+
+		return nil
+	}
+}
+
+func WithInsertBufferPoolSize(size int) Option {
+	return func(v *vqueue) error {
+		if size > 0 {
+			v.iBufSize = size
+		}
+
+		return nil
+	}
+}
+
+func WithDeleteBufferPoolSize(size int) Option {
+	return func(v *vqueue) error {
+		if size > 0 {
+			v.dBufSize = size
+		}
+
+		return nil
+	}
+}
diff --git a/pkg/agent/core/ngt/service/vqueue/option_test.go b/pkg/agent/core/ngt/service/vqueue/option_test.go
new file mode 100644
index 0000000000..0b7b71ac73
--- /dev/null
+++ b/pkg/agent/core/ngt/service/vqueue/option_test.go
@@ -0,0 +1,610 @@
+//
+// Copyright (C) 2019-2021 vdaas.org vald team <vald@vdaas.org>
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//    https://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+//
+
+// Package vqueue manages the vector cache layer for reducing FFI overhead for fast Agent processing.
+package vqueue
+
+import (
+	"testing"
+
+	"github.com/vdaas/vald/internal/errgroup"
+	"go.uber.org/goleak"
+)
+
+func TestWithErrGroup(t *testing.T) {
+	t.Parallel()
+	// Change interface type to the type of object you are testing
+	type T = interface{}
+	type args struct {
+		eg errgroup.Group
+	}
+	type want struct {
+		obj *T
+		// Uncomment this line if the option returns an error, otherwise delete it
+		// err error
+	}
+	type test struct {
+		name string
+		args args
+		want want
+		// Use the first line if the option returns an error. otherwise use the second line
+		// checkFunc  func(want, *T, error) error
+		// checkFunc  func(want, *T) error
+		beforeFunc func(args)
+		afterFunc  func(args)
+	}
+
+	// Uncomment this block if the option returns an error, otherwise delete it
+	/*
+	   defaultCheckFunc := func(w want, obj *T, err error) error {
+	       if !errors.Is(err, w.err) {
+	           return errors.Errorf("got_error: \"%#v\",\n\t\t\t\twant: \"%#v\"", err, w.err)
+	       }
+	       if !reflect.DeepEqual(obj, w.obj) {
+	           return errors.Errorf("got: \"%#v\",\n\t\t\t\twant: \"%#v\"", obj, w.obj)
+	       }
+	       return nil
+	   }
+	*/
+
+	// Uncomment this block if the option do not returns an error, otherwise delete it
+	/*
+	   defaultCheckFunc := func(w want, obj *T) error {
+	       if !reflect.DeepEqual(obj, w.obj) {
+	           return errors.Errorf("got: \"%#v\",\n\t\t\t\twant: \"%#v\"", obj, w.obj)
+	       }
+	       return nil
+	   }
+	*/
+
+	tests := []test{
+		// TODO test cases
+		/*
+		   {
+		       name: "test_case_1",
+		       args: args {
+		           eg: nil,
+		       },
+		       want: want {
+		           obj: new(T),
+		       },
+		   },
+		*/
+
+		// TODO test cases
+		/*
+		   func() test {
+		       return test {
+		           name: "test_case_2",
+		           args: args {
+		           eg: nil,
+		           },
+		           want: want {
+		               obj: new(T),
+		           },
+		       }
+		   }(),
+		*/
+	}
+
+	for _, tc := range tests {
+		test := tc
+		t.Run(test.name, func(tt *testing.T) {
+			tt.Parallel()
+			defer goleak.VerifyNone(tt, goleak.IgnoreCurrent())
+			if test.beforeFunc != nil {
+				test.beforeFunc(test.args)
+			}
+			if test.afterFunc != nil {
+				defer test.afterFunc(test.args)
+			}
+
+			// Uncomment this block if the option returns an error, otherwise delete it
+			/*
+			   if test.checkFunc == nil {
+			       test.checkFunc = defaultCheckFunc
+			   }
+
+			   got := WithErrGroup(test.args.eg)
+			   obj := new(T)
+			   if err := test.checkFunc(test.want, obj, got(obj)); err != nil {
+			       tt.Errorf("error = %v", err)
+			   }
+			*/
+
+			// Uncomment this block if the option do not return an error, otherwise delete it
+			/*
+			   if test.checkFunc == nil {
+			       test.checkFunc = defaultCheckFunc
+			   }
+			   got := WithErrGroup(test.args.eg)
+			   obj := new(T)
+			   got(obj)
+			   if err := test.checkFunc(test.want, obj); err != nil {
+			       tt.Errorf("error = %v", err)
+			   }
+			*/
+		})
+	}
+}
+
+func TestWithInsertBufferSize(t *testing.T) {
+	t.Parallel()
+	// Change interface type to the type of object you are testing
+	type T = interface{}
+	type args struct {
+		size int
+	}
+	type want struct {
+		obj *T
+		// Uncomment this line if the option returns an error, otherwise delete it
+		// err error
+	}
+	type test struct {
+		name string
+		args args
+		want want
+		// Use the first line if the option returns an error. otherwise use the second line
+		// checkFunc  func(want, *T, error) error
+		// checkFunc  func(want, *T) error
+		beforeFunc func(args)
+		afterFunc  func(args)
+	}
+
+	// Uncomment this block if the option returns an error, otherwise delete it
+	/*
+	   defaultCheckFunc := func(w want, obj *T, err error) error {
+	       if !errors.Is(err, w.err) {
+	           return errors.Errorf("got_error: \"%#v\",\n\t\t\t\twant: \"%#v\"", err, w.err)
+	       }
+	       if !reflect.DeepEqual(obj, w.obj) {
+	           return errors.Errorf("got: \"%#v\",\n\t\t\t\twant: \"%#v\"", obj, w.obj)
+	       }
+	       return nil
+	   }
+	*/
+
+	// Uncomment this block if the option do not returns an error, otherwise delete it
+	/*
+	   defaultCheckFunc := func(w want, obj *T) error {
+	       if !reflect.DeepEqual(obj, w.obj) {
+	           return errors.Errorf("got: \"%#v\",\n\t\t\t\twant: \"%#v\"", obj, w.obj)
+	       }
+	       return nil
+	   }
+	*/
+
+	tests := []test{
+		// TODO test cases
+		/*
+		   {
+		       name: "test_case_1",
+		       args: args {
+		           size: 0,
+		       },
+		       want: want {
+		           obj: new(T),
+		       },
+		   },
+		*/
+
+		// TODO test cases
+		/*
+		   func() test {
+		       return test {
+		           name: "test_case_2",
+		           args: args {
+		           size: 0,
+		           },
+		           want: want {
+		               obj: new(T),
+		           },
+		       }
+		   }(),
+		*/
+	}
+
+	for _, tc := range tests {
+		test := tc
+		t.Run(test.name, func(tt *testing.T) {
+			tt.Parallel()
+			defer goleak.VerifyNone(tt, goleak.IgnoreCurrent())
+			if test.beforeFunc != nil {
+				test.beforeFunc(test.args)
+			}
+			if test.afterFunc != nil {
+				defer test.afterFunc(test.args)
+			}
+
+			// Uncomment this block if the option returns an error, otherwise delete it
+			/*
+			   if test.checkFunc == nil {
+			       test.checkFunc = defaultCheckFunc
+			   }
+
+			   got := WithInsertBufferSize(test.args.size)
+			   obj := new(T)
+			   if err := test.checkFunc(test.want, obj, got(obj)); err != nil {
+			       tt.Errorf("error = %v", err)
+			   }
+			*/
+
+			// Uncomment this block if the option do not return an error, otherwise delete it
+			/*
+			   if test.checkFunc == nil {
+			       test.checkFunc = defaultCheckFunc
+			   }
+			   got := WithInsertBufferSize(test.args.size)
+			   obj := new(T)
+			   got(obj)
+			   if err := test.checkFunc(test.want, obj); err != nil {
+			       tt.Errorf("error = %v", err)
+			   }
+			*/
+		})
+	}
+}
+
+func TestWithDeleteBufferSize(t *testing.T) {
+	t.Parallel()
+	// Change interface type to the type of object you are testing
+	type T = interface{}
+	type args struct {
+		size int
+	}
+	type want struct {
+		obj *T
+		// Uncomment this line if the option returns an error, otherwise delete it
+		// err error
+	}
+	type test struct {
+		name string
+		args args
+		want want
+		// Use the first line if the option returns an error. otherwise use the second line
+		// checkFunc  func(want, *T, error) error
+		// checkFunc  func(want, *T) error
+		beforeFunc func(args)
+		afterFunc  func(args)
+	}
+
+	// Uncomment this block if the option returns an error, otherwise delete it
+	/*
+	   defaultCheckFunc := func(w want, obj *T, err error) error {
+	       if !errors.Is(err, w.err) {
+	           return errors.Errorf("got_error: \"%#v\",\n\t\t\t\twant: \"%#v\"", err, w.err)
+	       }
+	       if !reflect.DeepEqual(obj, w.obj) {
+	           return errors.Errorf("got: \"%#v\",\n\t\t\t\twant: \"%#v\"", obj, w.obj)
+	       }
+	       return nil
+	   }
+	*/
+
+	// Uncomment this block if the option do not returns an error, otherwise delete it
+	/*
+	   defaultCheckFunc := func(w want, obj *T) error {
+	       if !reflect.DeepEqual(obj, w.obj) {
+	           return errors.Errorf("got: \"%#v\",\n\t\t\t\twant: \"%#v\"", obj, w.obj)
+	       }
+	       return nil
+	   }
+	*/
+
+	tests := []test{
+		// TODO test cases
+		/*
+		   {
+		       name: "test_case_1",
+		       args: args {
+		           size: 0,
+		       },
+		       want: want {
+		           obj: new(T),
+		       },
+		   },
+		*/
+
+		// TODO test cases
+		/*
+		   func() test {
+		       return test {
+		           name: "test_case_2",
+		           args: args {
+		           size: 0,
+		           },
+		           want: want {
+		               obj: new(T),
+		           },
+		       }
+		   }(),
+		*/
+	}
+
+	for _, tc := range tests {
+		test := tc
+		t.Run(test.name, func(tt *testing.T) {
+			tt.Parallel()
+			defer goleak.VerifyNone(tt, goleak.IgnoreCurrent())
+			if test.beforeFunc != nil {
+				test.beforeFunc(test.args)
+			}
+			if test.afterFunc != nil {
+				defer test.afterFunc(test.args)
+			}
+
+			// Uncomment this block if the option returns an error, otherwise delete it
+			/*
+			   if test.checkFunc == nil {
+			       test.checkFunc = defaultCheckFunc
+			   }
+
+			   got := WithDeleteBufferSize(test.args.size)
+			   obj := new(T)
+			   if err := test.checkFunc(test.want, obj, got(obj)); err != nil {
+			       tt.Errorf("error = %v", err)
+			   }
+			*/
+
+			// Uncomment this block if the option do not return an error, otherwise delete it
+			/*
+			   if test.checkFunc == nil {
+			       test.checkFunc = defaultCheckFunc
+			   }
+			   got := WithDeleteBufferSize(test.args.size)
+			   obj := new(T)
+			   got(obj)
+			   if err := test.checkFunc(test.want, obj); err != nil {
+			       tt.Errorf("error = %v", err)
+			   }
+			*/
+		})
+	}
+}
+
+func TestWithInsertBufferPoolSize(t *testing.T) {
+	t.Parallel()
+	// Change interface type to the type of object you are testing
+	type T = interface{}
+	type args struct {
+		size int
+	}
+	type want struct {
+		obj *T
+		// Uncomment this line if the option returns an error, otherwise delete it
+		// err error
+	}
+	type test struct {
+		name string
+		args args
+		want want
+		// Use the first line if the option returns an error. otherwise use the second line
+		// checkFunc  func(want, *T, error) error
+		// checkFunc  func(want, *T) error
+		beforeFunc func(args)
+		afterFunc  func(args)
+	}
+
+	// Uncomment this block if the option returns an error, otherwise delete it
+	/*
+	   defaultCheckFunc := func(w want, obj *T, err error) error {
+	       if !errors.Is(err, w.err) {
+	           return errors.Errorf("got_error: \"%#v\",\n\t\t\t\twant: \"%#v\"", err, w.err)
+	       }
+	       if !reflect.DeepEqual(obj, w.obj) {
+	           return errors.Errorf("got: \"%#v\",\n\t\t\t\twant: \"%#v\"", obj, w.obj)
+	       }
+	       return nil
+	   }
+	*/
+
+	// Uncomment this block if the option do not returns an error, otherwise delete it
+	/*
+	   defaultCheckFunc := func(w want, obj *T) error {
+	       if !reflect.DeepEqual(obj, w.obj) {
+	           return errors.Errorf("got: \"%#v\",\n\t\t\t\twant: \"%#v\"", obj, w.obj)
+	       }
+	       return nil
+	   }
+	*/
+
+	tests := []test{
+		// TODO test cases
+		/*
+		   {
+		       name: "test_case_1",
+		       args: args {
+		           size: 0,
+		       },
+		       want: want {
+		           obj: new(T),
+		       },
+		   },
+		*/
+
+		// TODO test cases
+		/*
+		   func() test {
+		       return test {
+		           name: "test_case_2",
+		           args: args {
+		           size: 0,
+		           },
+		           want: want {
+		               obj: new(T),
+		           },
+		       }
+		   }(),
+		*/
+	}
+
+	for _, tc := range tests {
+		test := tc
+		t.Run(test.name, func(tt *testing.T) {
+			tt.Parallel()
+			defer goleak.VerifyNone(tt, goleak.IgnoreCurrent())
+			if test.beforeFunc != nil {
+				test.beforeFunc(test.args)
+			}
+			if test.afterFunc != nil {
+				defer test.afterFunc(test.args)
+			}
+
+			// Uncomment this block if the option returns an error, otherwise delete it
+			/*
+			   if test.checkFunc == nil {
+			       test.checkFunc = defaultCheckFunc
+			   }
+
+			   got := WithInsertBufferPoolSize(test.args.size)
+			   obj := new(T)
+			   if err := test.checkFunc(test.want, obj, got(obj)); err != nil {
+			       tt.Errorf("error = %v", err)
+			   }
+			*/
+
+			// Uncomment this block if the option do not return an error, otherwise delete it
+			/*
+			   if test.checkFunc == nil {
+			       test.checkFunc = defaultCheckFunc
+			   }
+			   got := WithInsertBufferPoolSize(test.args.size)
+			   obj := new(T)
+			   got(obj)
+			   if err := test.checkFunc(test.want, obj); err != nil {
+			       tt.Errorf("error = %v", err)
+			   }
+			*/
+		})
+	}
+}
+
+func TestWithDeleteBufferPoolSize(t *testing.T) {
+	t.Parallel()
+	// Change interface type to the type of object you are testing
+	type T = interface{}
+	type args struct {
+		size int
+	}
+	type want struct {
+		obj *T
+		// Uncomment this line if the option returns an error, otherwise delete it
+		// err error
+	}
+	type test struct {
+		name string
+		args args
+		want want
+		// Use the first line if the option returns an error. otherwise use the second line
+		// checkFunc  func(want, *T, error) error
+		// checkFunc  func(want, *T) error
+		beforeFunc func(args)
+		afterFunc  func(args)
+	}
+
+	// Uncomment this block if the option returns an error, otherwise delete it
+	/*
+	   defaultCheckFunc := func(w want, obj *T, err error) error {
+	       if !errors.Is(err, w.err) {
+	           return errors.Errorf("got_error: \"%#v\",\n\t\t\t\twant: \"%#v\"", err, w.err)
+	       }
+	       if !reflect.DeepEqual(obj, w.obj) {
+	           return errors.Errorf("got: \"%#v\",\n\t\t\t\twant: \"%#v\"", obj, w.obj)
+	       }
+	       return nil
+	   }
+	*/
+
+	// Uncomment this block if the option do not returns an error, otherwise delete it
+	/*
+	   defaultCheckFunc := func(w want, obj *T) error {
+	       if !reflect.DeepEqual(obj, w.obj) {
+	           return errors.Errorf("got: \"%#v\",\n\t\t\t\twant: \"%#v\"", obj, w.obj)
+	       }
+	       return nil
+	   }
+	*/
+
+	tests := []test{
+		// TODO test cases
+		/*
+		   {
+		       name: "test_case_1",
+		       args: args {
+		           size: 0,
+		       },
+		       want: want {
+		           obj: new(T),
+		       },
+		   },
+		*/
+
+		// TODO test cases
+		/*
+		   func() test {
+		       return test {
+		           name: "test_case_2",
+		           args: args {
+		           size: 0,
+		           },
+		           want: want {
+		               obj: new(T),
+		           },
+		       }
+		   }(),
+		*/
+	}
+
+	for _, tc := range tests {
+		test := tc
+		t.Run(test.name, func(tt *testing.T) {
+			tt.Parallel()
+			defer goleak.VerifyNone(tt, goleak.IgnoreCurrent())
+			if test.beforeFunc != nil {
+				test.beforeFunc(test.args)
+			}
+			if test.afterFunc != nil {
+				defer test.afterFunc(test.args)
+			}
+
+			// Uncomment this block if the option returns an error, otherwise delete it
+			/*
+			   if test.checkFunc == nil {
+			       test.checkFunc = defaultCheckFunc
+			   }
+
+			   got := WithDeleteBufferPoolSize(test.args.size)
+			   obj := new(T)
+			   if err := test.checkFunc(test.want, obj, got(obj)); err != nil {
+			       tt.Errorf("error = %v", err)
+			   }
+			*/
+
+			// Uncomment this block if the option do not return an error, otherwise delete it
+			/*
+			   if test.checkFunc == nil {
+			       test.checkFunc = defaultCheckFunc
+			   }
+			   got := WithDeleteBufferPoolSize(test.args.size)
+			   obj := new(T)
+			   got(obj)
+			   if err := test.checkFunc(test.want, obj); err != nil {
+			       tt.Errorf("error = %v", err)
+			   }
+			*/
+		})
+	}
+}
diff --git a/pkg/agent/core/ngt/service/vqueue/queue.go b/pkg/agent/core/ngt/service/vqueue/queue.go
new file mode 100644
index 0000000000..82d0085a56
--- /dev/null
+++ b/pkg/agent/core/ngt/service/vqueue/queue.go
@@ -0,0 +1,350 @@
+//
+// Copyright (C) 2019-2021 vdaas.org vald team <vald@vdaas.org>
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//    https://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+//
+
+// Package vqueue manages the vector cache layer for reducing FFI overhead for fast Agent processing.
+package vqueue
+
+import (
+	"context"
+	"reflect"
+	"sort"
+	"sync"
+	"sync/atomic"
+	"time"
+
+	"github.com/vdaas/vald/internal/errgroup"
+	"github.com/vdaas/vald/internal/errors"
+	"github.com/vdaas/vald/internal/safety"
+)
+
+type Queue interface {
+	Start(ctx context.Context) (<-chan error, error)
+	PushInsert(uuid string, vector []float32, date int64) error
+	PushDelete(uuid string, date int64) error
+	GetVector(uuid string) ([]float32, bool)
+	RangePopInsert(ctx context.Context, f func(uuid string, vector []float32) bool)
+	RangePopDelete(ctx context.Context, f func(uuid string) bool)
+	IVQLen() int
+	IVCLen() int
+	DVQLen() int
+	DVCLen() int
+}
+
+type vqueue struct {
+	ich              chan index           // ich is insert channel
+	uii              []index              // uii is un inserted index
+	imu              sync.Mutex           // insert mutex
+	uiim             map[string][]float32 // uiim is un inserted index map (this value is used for GetVector operation to return queued vector cache data)
+	dch              chan key             // dch is delete channel
+	udk              []key                // udk is un deleted key
+	dmu              sync.Mutex           // delete mutex
+	eg               errgroup.Group
+	finalizingInsert atomic.Value
+	finalizingDelete atomic.Value
+	closed           atomic.Value
+
+	// buffer config
+	ichSize  int
+	dchSize  int
+	iBufSize int
+	dBufSize int
+}
+
+type index struct {
+	uuid   string
+	vector []float32
+	date   int64
+}
+
+type key struct {
+	uuid   string
+	vector []float32
+	date   int64
+}
+
+func New(opts ...Option) (Queue, error) {
+	vq := new(vqueue)
+	for _, opt := range append(defaultOptions, opts...) {
+		if err := opt(vq); err != nil {
+			return nil, errors.ErrOptionFailed(err, reflect.ValueOf(opt))
+		}
+	}
+	vq.ich = make(chan index, vq.ichSize)
+	vq.uii = make([]index, 0, vq.iBufSize)
+	vq.uiim = make(map[string][]float32, vq.iBufSize)
+	vq.dch = make(chan key, vq.dchSize)
+	vq.udk = make([]key, 0, vq.dBufSize)
+	vq.finalizingInsert.Store(false)
+	vq.finalizingDelete.Store(false)
+	vq.closed.Store(true)
+	return vq, nil
+}
+
+func (v *vqueue) Start(ctx context.Context) (<-chan error, error) {
+	ech := make(chan error, 1)
+	v.eg.Go(safety.RecoverFunc(func() (err error) {
+		v.closed.Store(false)
+		defer v.closed.Store(true)
+		defer close(ech)
+		for {
+			select {
+			case <-ctx.Done():
+				v.finalizingInsert.Store(true)
+				close(v.ich)
+				for i := range v.ich {
+					v.addInsert(i)
+				}
+				v.finalizingInsert.Store(false)
+				err := ctx.Err()
+				if errors.Is(err, context.Canceled) || errors.Is(err, context.DeadlineExceeded) {
+					return nil
+				}
+				return err
+			case i := <-v.ich:
+				v.addInsert(i)
+			}
+		}
+	}))
+	v.eg.Go(safety.RecoverFunc(func() (err error) {
+		v.closed.Store(false)
+		defer v.closed.Store(true)
+		for {
+			select {
+			case <-ctx.Done():
+				v.finalizingDelete.Store(true)
+				close(v.dch)
+				for d := range v.dch {
+					v.addDelete(d)
+				}
+				v.finalizingDelete.Store(false)
+				err := ctx.Err()
+				if errors.Is(err, context.Canceled) || errors.Is(err, context.DeadlineExceeded) {
+					return nil
+				}
+				return err
+			case d := <-v.dch:
+				v.addDelete(d)
+			}
+		}
+	}))
+	return ech, nil
+}
+
+func (v *vqueue) PushInsert(uuid string, vector []float32, date int64) error {
+	// we have to check this instance's channel bypass daemon is finalizing or not, if in finalizing process we should not send new index to channel
+	if v.finalizingInsert.Load().(bool) || v.closed.Load().(bool) {
+		return errors.ErrVQueueFinalizing
+	}
+	if date == 0 {
+		date = time.Now().UnixNano()
+	}
+
+	v.ich <- index{
+		uuid:   uuid,
+		vector: vector,
+		date:   date,
+	}
+	return nil
+}
+
+func (v *vqueue) PushDelete(uuid string, date int64) error {
+	// we have to check this instance's channel bypass daemon is finalizing or not, if in finalizing process we should not send new index to channel
+	if v.finalizingDelete.Load().(bool) || v.closed.Load().(bool) {
+		return errors.ErrVQueueFinalizing
+	}
+	if date == 0 {
+		date = time.Now().UnixNano()
+	}
+	v.dch <- key{
+		uuid: uuid,
+		date: date,
+	}
+	return nil
+}
+
+func (v *vqueue) RangePopInsert(ctx context.Context, f func(uuid string, vector []float32) bool) {
+	// if finalizing, wait for all insert channel queue processed
+	for v.finalizingInsert.Load().(bool) {
+		select {
+		case <-ctx.Done():
+			return
+		case <-time.After(time.Millisecond * 100):
+		}
+	}
+	for _, idx := range v.flushAndLoadInsert() {
+		select {
+		case <-ctx.Done():
+			return
+		default:
+			if !f(idx.uuid, idx.vector) {
+				return
+			}
+		}
+	}
+}
+
+func (v *vqueue) RangePopDelete(ctx context.Context, f func(uuid string) bool) {
+	// if finalizing, wait for all insert & delete channel queue processed
+	for v.finalizingDelete.Load().(bool) || v.finalizingInsert.Load().(bool) {
+		select {
+		case <-ctx.Done():
+			return
+		case <-time.After(time.Millisecond * 100):
+		}
+	}
+	for _, key := range v.flushAndLoadDelete() {
+		select {
+		case <-ctx.Done():
+			return
+		default:
+			if !f(key.uuid) {
+				return
+			}
+		}
+	}
+}
+
+func (v *vqueue) GetVector(uuid string) ([]float32, bool) {
+	v.imu.Lock()
+	vec, ok := v.uiim[uuid]
+	v.imu.Unlock()
+	return vec, ok
+}
+
+func (v *vqueue) addInsert(i index) {
+	v.imu.Lock()
+	v.uii = append(v.uii, i)
+	v.uiim[i.uuid] = i.vector
+	v.imu.Unlock()
+}
+
+func (v *vqueue) addDelete(d key) {
+	v.dmu.Lock()
+	v.udk = append(v.udk, d)
+	v.dmu.Unlock()
+}
+
+func (v *vqueue) flushAndLoadInsert() (uii []index) {
+	v.imu.Lock()
+	uii = make([]index, len(v.uii))
+	copy(uii, v.uii)
+	v.uii = v.uii[:0]
+	v.imu.Unlock()
+	sort.Slice(uii, func(i, j int) bool {
+		return uii[i].date > uii[j].date
+	})
+	dup := make(map[string]bool, len(uii)/2)
+	dl := make([]int, 0, len(uii)/2)
+	for i, idx := range uii {
+		v.imu.Lock()
+		delete(v.uiim, idx.uuid)
+		v.imu.Unlock()
+		if dup[idx.uuid] {
+			dl = append(dl, i)
+		} else {
+			dup[idx.uuid] = true
+		}
+	}
+	sort.Sort(sort.Reverse(sort.IntSlice(dl)))
+	for _, i := range dl {
+		uii = append(uii[:i], uii[i+1:]...)
+	}
+	sort.Slice(uii, func(i, j int) bool {
+		return uii[i].date < uii[j].date
+	})
+	return uii
+}
+
+func (v *vqueue) flushAndLoadDelete() (udk []key) {
+	v.dmu.Lock()
+	udk = make([]key, len(v.udk))
+	copy(udk, v.udk)
+	v.udk = v.udk[:0]
+	v.dmu.Unlock()
+	sort.Slice(udk, func(i, j int) bool {
+		return udk[i].date > udk[j].date
+	})
+	dup := make(map[string]bool, len(udk)/2)
+	dl := make([]int, 0, len(udk)/2)
+	for i, idx := range udk {
+		if dup[idx.uuid] {
+			dl = append(dl, i)
+		} else {
+			dup[idx.uuid] = true
+		}
+	}
+	sort.Sort(sort.Reverse(sort.IntSlice(dl)))
+	for _, i := range dl {
+		udk = append(udk[:i], udk[i+1:]...)
+	}
+	sort.Slice(udk, func(i, j int) bool {
+		return udk[i].date < udk[j].date
+	})
+
+	udm := make(map[string]int64, len(udk))
+	for _, d := range udk {
+		udm[d.uuid] = d.date
+	}
+	dl = dl[:0]
+
+	// In the CreateIndex operation of the NGT Service, the Delete Queue is processed first, and then the Insert Queue is processed,
+	// so the Insert Queue still contains the old Insert Operation older than the Delete Queue,
+	// and it is possible that data that was intended to be deleted is registered again.
+	// For this reason, the data is deleted from the Insert Queue only when retrieving data from the Delete Queue.
+	// we should check insert vqueue if insert vqueue exists and delete operation date is newer than insert operation date then we should remove insert vqueue's data.
+	v.imu.Lock()
+	for i, idx := range v.uii {
+		// check same uuid & operation date
+		// if date is equal, it may update operation we shouldn't remove at that time
+		date, exists := udm[idx.uuid]
+		if exists && date > idx.date {
+			dl = append(dl, i)
+		}
+	}
+	v.imu.Unlock()
+	sort.Sort(sort.Reverse(sort.IntSlice(dl)))
+	for _, i := range dl {
+		v.imu.Lock()
+		// remove unnecessary insert vector queue data
+		v.uii = append(v.uii[:i], v.uii[i+1:]...)
+		// remove from existing map
+		delete(v.uiim, v.uii[i].uuid)
+		v.imu.Unlock()
+	}
+	return udk
+}
+
+func (v *vqueue) IVQLen() (l int) {
+	v.imu.Lock()
+	l = len(v.uii)
+	v.imu.Unlock()
+	return l
+}
+
+func (v *vqueue) DVQLen() (l int) {
+	v.dmu.Lock()
+	l = len(v.udk)
+	v.dmu.Unlock()
+	return l
+}
+
+func (v *vqueue) IVCLen() int {
+	return len(v.ich)
+}
+
+func (v *vqueue) DVCLen() int {
+	return len(v.dch)
+}
diff --git a/pkg/agent/core/ngt/service/vqueue/queue_test.go b/pkg/agent/core/ngt/service/vqueue/queue_test.go
new file mode 100644
index 0000000000..cc3ececc9d
--- /dev/null
+++ b/pkg/agent/core/ngt/service/vqueue/queue_test.go
@@ -0,0 +1,2038 @@
+//
+// Copyright (C) 2019-2021 vdaas.org vald team <vald@vdaas.org>
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//    https://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+//
+
+// Package vqueue manages the vector cache layer for reducing FFI overhead for fast Agent processing.
+package vqueue
+
+import (
+	"context"
+	"reflect"
+	"sync"
+	"sync/atomic"
+	"testing"
+
+	"github.com/vdaas/vald/internal/errgroup"
+	"github.com/vdaas/vald/internal/errors"
+	"go.uber.org/goleak"
+)
+
+func TestNew(t *testing.T) {
+	t.Parallel()
+	type args struct {
+		opts []Option
+	}
+	type want struct {
+		want Queue
+		err  error
+	}
+	type test struct {
+		name       string
+		args       args
+		want       want
+		checkFunc  func(want, Queue, error) error
+		beforeFunc func(args)
+		afterFunc  func(args)
+	}
+	defaultCheckFunc := func(w want, got Queue, err error) error {
+		if !errors.Is(err, w.err) {
+			return errors.Errorf("got_error: \"%#v\",\n\t\t\t\twant: \"%#v\"", err, w.err)
+		}
+		if !reflect.DeepEqual(got, w.want) {
+			return errors.Errorf("got: \"%#v\",\n\t\t\t\twant: \"%#v\"", got, w.want)
+		}
+		return nil
+	}
+	tests := []test{
+		// TODO test cases
+		/*
+		   {
+		       name: "test_case_1",
+		       args: args {
+		           opts: nil,
+		       },
+		       want: want{},
+		       checkFunc: defaultCheckFunc,
+		   },
+		*/
+
+		// TODO test cases
+		/*
+		   func() test {
+		       return test {
+		           name: "test_case_2",
+		           args: args {
+		           opts: nil,
+		           },
+		           want: want{},
+		           checkFunc: defaultCheckFunc,
+		       }
+		   }(),
+		*/
+	}
+
+	for _, tc := range tests {
+		test := tc
+		t.Run(test.name, func(tt *testing.T) {
+			tt.Parallel()
+			defer goleak.VerifyNone(tt, goleak.IgnoreCurrent())
+			if test.beforeFunc != nil {
+				test.beforeFunc(test.args)
+			}
+			if test.afterFunc != nil {
+				defer test.afterFunc(test.args)
+			}
+			if test.checkFunc == nil {
+				test.checkFunc = defaultCheckFunc
+			}
+
+			got, err := New(test.args.opts...)
+			if err := test.checkFunc(test.want, got, err); err != nil {
+				tt.Errorf("error = %v", err)
+			}
+		})
+	}
+}
+
+func Test_vqueue_Start(t *testing.T) {
+	t.Parallel()
+	type args struct {
+		ctx context.Context
+	}
+	type fields struct {
+		ich              chan index
+		uii              []index
+		imu              sync.Mutex
+		uiim             map[string][]float32
+		dch              chan key
+		udk              []key
+		dmu              sync.Mutex
+		eg               errgroup.Group
+		finalizingInsert atomic.Value
+		finalizingDelete atomic.Value
+		closed           atomic.Value
+		ichSize          int
+		dchSize          int
+		iBufSize         int
+		dBufSize         int
+	}
+	type want struct {
+		want <-chan error
+		err  error
+	}
+	type test struct {
+		name       string
+		args       args
+		fields     fields
+		want       want
+		checkFunc  func(want, <-chan error, error) error
+		beforeFunc func(args)
+		afterFunc  func(args)
+	}
+	defaultCheckFunc := func(w want, got <-chan error, err error) error {
+		if !errors.Is(err, w.err) {
+			return errors.Errorf("got_error: \"%#v\",\n\t\t\t\twant: \"%#v\"", err, w.err)
+		}
+		if !reflect.DeepEqual(got, w.want) {
+			return errors.Errorf("got: \"%#v\",\n\t\t\t\twant: \"%#v\"", got, w.want)
+		}
+		return nil
+	}
+	tests := []test{
+		// TODO test cases
+		/*
+		   {
+		       name: "test_case_1",
+		       args: args {
+		           ctx: nil,
+		       },
+		       fields: fields {
+		           ich: nil,
+		           uii: nil,
+		           imu: sync.Mutex{},
+		           uiim: nil,
+		           dch: nil,
+		           udk: nil,
+		           dmu: sync.Mutex{},
+		           eg: nil,
+		           finalizingInsert: nil,
+		           finalizingDelete: nil,
+		           closed: nil,
+		           ichSize: 0,
+		           dchSize: 0,
+		           iBufSize: 0,
+		           dBufSize: 0,
+		       },
+		       want: want{},
+		       checkFunc: defaultCheckFunc,
+		   },
+		*/
+
+		// TODO test cases
+		/*
+		   func() test {
+		       return test {
+		           name: "test_case_2",
+		           args: args {
+		           ctx: nil,
+		           },
+		           fields: fields {
+		           ich: nil,
+		           uii: nil,
+		           imu: sync.Mutex{},
+		           uiim: nil,
+		           dch: nil,
+		           udk: nil,
+		           dmu: sync.Mutex{},
+		           eg: nil,
+		           finalizingInsert: nil,
+		           finalizingDelete: nil,
+		           closed: nil,
+		           ichSize: 0,
+		           dchSize: 0,
+		           iBufSize: 0,
+		           dBufSize: 0,
+		           },
+		           want: want{},
+		           checkFunc: defaultCheckFunc,
+		       }
+		   }(),
+		*/
+	}
+
+	for _, tc := range tests {
+		test := tc
+		t.Run(test.name, func(tt *testing.T) {
+			tt.Parallel()
+			defer goleak.VerifyNone(tt, goleak.IgnoreCurrent())
+			if test.beforeFunc != nil {
+				test.beforeFunc(test.args)
+			}
+			if test.afterFunc != nil {
+				defer test.afterFunc(test.args)
+			}
+			if test.checkFunc == nil {
+				test.checkFunc = defaultCheckFunc
+			}
+			v := &vqueue{
+				ich:              test.fields.ich,
+				uii:              test.fields.uii,
+				imu:              test.fields.imu,
+				uiim:             test.fields.uiim,
+				dch:              test.fields.dch,
+				udk:              test.fields.udk,
+				dmu:              test.fields.dmu,
+				eg:               test.fields.eg,
+				finalizingInsert: test.fields.finalizingInsert,
+				finalizingDelete: test.fields.finalizingDelete,
+				closed:           test.fields.closed,
+				ichSize:          test.fields.ichSize,
+				dchSize:          test.fields.dchSize,
+				iBufSize:         test.fields.iBufSize,
+				dBufSize:         test.fields.dBufSize,
+			}
+
+			got, err := v.Start(test.args.ctx)
+			if err := test.checkFunc(test.want, got, err); err != nil {
+				tt.Errorf("error = %v", err)
+			}
+		})
+	}
+}
+
+func Test_vqueue_PushInsert(t *testing.T) {
+	t.Parallel()
+	type args struct {
+		uuid   string
+		vector []float32
+		date   int64
+	}
+	type fields struct {
+		ich              chan index
+		uii              []index
+		imu              sync.Mutex
+		uiim             map[string][]float32
+		dch              chan key
+		udk              []key
+		dmu              sync.Mutex
+		eg               errgroup.Group
+		finalizingInsert atomic.Value
+		finalizingDelete atomic.Value
+		closed           atomic.Value
+		ichSize          int
+		dchSize          int
+		iBufSize         int
+		dBufSize         int
+	}
+	type want struct {
+		err error
+	}
+	type test struct {
+		name       string
+		args       args
+		fields     fields
+		want       want
+		checkFunc  func(want, error) error
+		beforeFunc func(args)
+		afterFunc  func(args)
+	}
+	defaultCheckFunc := func(w want, err error) error {
+		if !errors.Is(err, w.err) {
+			return errors.Errorf("got_error: \"%#v\",\n\t\t\t\twant: \"%#v\"", err, w.err)
+		}
+		return nil
+	}
+	tests := []test{
+		// TODO test cases
+		/*
+		   {
+		       name: "test_case_1",
+		       args: args {
+		           uuid: "",
+		           vector: nil,
+		           date: 0,
+		       },
+		       fields: fields {
+		           ich: nil,
+		           uii: nil,
+		           imu: sync.Mutex{},
+		           uiim: nil,
+		           dch: nil,
+		           udk: nil,
+		           dmu: sync.Mutex{},
+		           eg: nil,
+		           finalizingInsert: nil,
+		           finalizingDelete: nil,
+		           closed: nil,
+		           ichSize: 0,
+		           dchSize: 0,
+		           iBufSize: 0,
+		           dBufSize: 0,
+		       },
+		       want: want{},
+		       checkFunc: defaultCheckFunc,
+		   },
+		*/
+
+		// TODO test cases
+		/*
+		   func() test {
+		       return test {
+		           name: "test_case_2",
+		           args: args {
+		           uuid: "",
+		           vector: nil,
+		           date: 0,
+		           },
+		           fields: fields {
+		           ich: nil,
+		           uii: nil,
+		           imu: sync.Mutex{},
+		           uiim: nil,
+		           dch: nil,
+		           udk: nil,
+		           dmu: sync.Mutex{},
+		           eg: nil,
+		           finalizingInsert: nil,
+		           finalizingDelete: nil,
+		           closed: nil,
+		           ichSize: 0,
+		           dchSize: 0,
+		           iBufSize: 0,
+		           dBufSize: 0,
+		           },
+		           want: want{},
+		           checkFunc: defaultCheckFunc,
+		       }
+		   }(),
+		*/
+	}
+
+	for _, tc := range tests {
+		test := tc
+		t.Run(test.name, func(tt *testing.T) {
+			tt.Parallel()
+			defer goleak.VerifyNone(tt, goleak.IgnoreCurrent())
+			if test.beforeFunc != nil {
+				test.beforeFunc(test.args)
+			}
+			if test.afterFunc != nil {
+				defer test.afterFunc(test.args)
+			}
+			if test.checkFunc == nil {
+				test.checkFunc = defaultCheckFunc
+			}
+			v := &vqueue{
+				ich:              test.fields.ich,
+				uii:              test.fields.uii,
+				imu:              test.fields.imu,
+				uiim:             test.fields.uiim,
+				dch:              test.fields.dch,
+				udk:              test.fields.udk,
+				dmu:              test.fields.dmu,
+				eg:               test.fields.eg,
+				finalizingInsert: test.fields.finalizingInsert,
+				finalizingDelete: test.fields.finalizingDelete,
+				closed:           test.fields.closed,
+				ichSize:          test.fields.ichSize,
+				dchSize:          test.fields.dchSize,
+				iBufSize:         test.fields.iBufSize,
+				dBufSize:         test.fields.dBufSize,
+			}
+
+			err := v.PushInsert(test.args.uuid, test.args.vector, test.args.date)
+			if err := test.checkFunc(test.want, err); err != nil {
+				tt.Errorf("error = %v", err)
+			}
+		})
+	}
+}
+
+func Test_vqueue_PushDelete(t *testing.T) {
+	t.Parallel()
+	type args struct {
+		uuid string
+		date int64
+	}
+	type fields struct {
+		ich              chan index
+		uii              []index
+		imu              sync.Mutex
+		uiim             map[string][]float32
+		dch              chan key
+		udk              []key
+		dmu              sync.Mutex
+		eg               errgroup.Group
+		finalizingInsert atomic.Value
+		finalizingDelete atomic.Value
+		closed           atomic.Value
+		ichSize          int
+		dchSize          int
+		iBufSize         int
+		dBufSize         int
+	}
+	type want struct {
+		err error
+	}
+	type test struct {
+		name       string
+		args       args
+		fields     fields
+		want       want
+		checkFunc  func(want, error) error
+		beforeFunc func(args)
+		afterFunc  func(args)
+	}
+	defaultCheckFunc := func(w want, err error) error {
+		if !errors.Is(err, w.err) {
+			return errors.Errorf("got_error: \"%#v\",\n\t\t\t\twant: \"%#v\"", err, w.err)
+		}
+		return nil
+	}
+	tests := []test{
+		// TODO test cases
+		/*
+		   {
+		       name: "test_case_1",
+		       args: args {
+		           uuid: "",
+		           date: 0,
+		       },
+		       fields: fields {
+		           ich: nil,
+		           uii: nil,
+		           imu: sync.Mutex{},
+		           uiim: nil,
+		           dch: nil,
+		           udk: nil,
+		           dmu: sync.Mutex{},
+		           eg: nil,
+		           finalizingInsert: nil,
+		           finalizingDelete: nil,
+		           closed: nil,
+		           ichSize: 0,
+		           dchSize: 0,
+		           iBufSize: 0,
+		           dBufSize: 0,
+		       },
+		       want: want{},
+		       checkFunc: defaultCheckFunc,
+		   },
+		*/
+
+		// TODO test cases
+		/*
+		   func() test {
+		       return test {
+		           name: "test_case_2",
+		           args: args {
+		           uuid: "",
+		           date: 0,
+		           },
+		           fields: fields {
+		           ich: nil,
+		           uii: nil,
+		           imu: sync.Mutex{},
+		           uiim: nil,
+		           dch: nil,
+		           udk: nil,
+		           dmu: sync.Mutex{},
+		           eg: nil,
+		           finalizingInsert: nil,
+		           finalizingDelete: nil,
+		           closed: nil,
+		           ichSize: 0,
+		           dchSize: 0,
+		           iBufSize: 0,
+		           dBufSize: 0,
+		           },
+		           want: want{},
+		           checkFunc: defaultCheckFunc,
+		       }
+		   }(),
+		*/
+	}
+
+	for _, tc := range tests {
+		test := tc
+		t.Run(test.name, func(tt *testing.T) {
+			tt.Parallel()
+			defer goleak.VerifyNone(tt, goleak.IgnoreCurrent())
+			if test.beforeFunc != nil {
+				test.beforeFunc(test.args)
+			}
+			if test.afterFunc != nil {
+				defer test.afterFunc(test.args)
+			}
+			if test.checkFunc == nil {
+				test.checkFunc = defaultCheckFunc
+			}
+			v := &vqueue{
+				ich:              test.fields.ich,
+				uii:              test.fields.uii,
+				imu:              test.fields.imu,
+				uiim:             test.fields.uiim,
+				dch:              test.fields.dch,
+				udk:              test.fields.udk,
+				dmu:              test.fields.dmu,
+				eg:               test.fields.eg,
+				finalizingInsert: test.fields.finalizingInsert,
+				finalizingDelete: test.fields.finalizingDelete,
+				closed:           test.fields.closed,
+				ichSize:          test.fields.ichSize,
+				dchSize:          test.fields.dchSize,
+				iBufSize:         test.fields.iBufSize,
+				dBufSize:         test.fields.dBufSize,
+			}
+
+			err := v.PushDelete(test.args.uuid, test.args.date)
+			if err := test.checkFunc(test.want, err); err != nil {
+				tt.Errorf("error = %v", err)
+			}
+		})
+	}
+}
+
+func Test_vqueue_RangePopInsert(t *testing.T) {
+	t.Parallel()
+	type args struct {
+		ctx context.Context
+		f   func(uuid string, vector []float32) bool
+	}
+	type fields struct {
+		ich              chan index
+		uii              []index
+		imu              sync.Mutex
+		uiim             map[string][]float32
+		dch              chan key
+		udk              []key
+		dmu              sync.Mutex
+		eg               errgroup.Group
+		finalizingInsert atomic.Value
+		finalizingDelete atomic.Value
+		closed           atomic.Value
+		ichSize          int
+		dchSize          int
+		iBufSize         int
+		dBufSize         int
+	}
+	type want struct{}
+	type test struct {
+		name       string
+		args       args
+		fields     fields
+		want       want
+		checkFunc  func(want) error
+		beforeFunc func(args)
+		afterFunc  func(args)
+	}
+	defaultCheckFunc := func(w want) error {
+		return nil
+	}
+	tests := []test{
+		// TODO test cases
+		/*
+		   {
+		       name: "test_case_1",
+		       args: args {
+		           ctx: nil,
+		           f: nil,
+		       },
+		       fields: fields {
+		           ich: nil,
+		           uii: nil,
+		           imu: sync.Mutex{},
+		           uiim: nil,
+		           dch: nil,
+		           udk: nil,
+		           dmu: sync.Mutex{},
+		           eg: nil,
+		           finalizingInsert: nil,
+		           finalizingDelete: nil,
+		           closed: nil,
+		           ichSize: 0,
+		           dchSize: 0,
+		           iBufSize: 0,
+		           dBufSize: 0,
+		       },
+		       want: want{},
+		       checkFunc: defaultCheckFunc,
+		   },
+		*/
+
+		// TODO test cases
+		/*
+		   func() test {
+		       return test {
+		           name: "test_case_2",
+		           args: args {
+		           ctx: nil,
+		           f: nil,
+		           },
+		           fields: fields {
+		           ich: nil,
+		           uii: nil,
+		           imu: sync.Mutex{},
+		           uiim: nil,
+		           dch: nil,
+		           udk: nil,
+		           dmu: sync.Mutex{},
+		           eg: nil,
+		           finalizingInsert: nil,
+		           finalizingDelete: nil,
+		           closed: nil,
+		           ichSize: 0,
+		           dchSize: 0,
+		           iBufSize: 0,
+		           dBufSize: 0,
+		           },
+		           want: want{},
+		           checkFunc: defaultCheckFunc,
+		       }
+		   }(),
+		*/
+	}
+
+	for _, tc := range tests {
+		test := tc
+		t.Run(test.name, func(tt *testing.T) {
+			tt.Parallel()
+			defer goleak.VerifyNone(tt, goleak.IgnoreCurrent())
+			if test.beforeFunc != nil {
+				test.beforeFunc(test.args)
+			}
+			if test.afterFunc != nil {
+				defer test.afterFunc(test.args)
+			}
+			if test.checkFunc == nil {
+				test.checkFunc = defaultCheckFunc
+			}
+			v := &vqueue{
+				ich:              test.fields.ich,
+				uii:              test.fields.uii,
+				imu:              test.fields.imu,
+				uiim:             test.fields.uiim,
+				dch:              test.fields.dch,
+				udk:              test.fields.udk,
+				dmu:              test.fields.dmu,
+				eg:               test.fields.eg,
+				finalizingInsert: test.fields.finalizingInsert,
+				finalizingDelete: test.fields.finalizingDelete,
+				closed:           test.fields.closed,
+				ichSize:          test.fields.ichSize,
+				dchSize:          test.fields.dchSize,
+				iBufSize:         test.fields.iBufSize,
+				dBufSize:         test.fields.dBufSize,
+			}
+
+			v.RangePopInsert(test.args.ctx, test.args.f)
+			if err := test.checkFunc(test.want); err != nil {
+				tt.Errorf("error = %v", err)
+			}
+		})
+	}
+}
+
+func Test_vqueue_RangePopDelete(t *testing.T) {
+	t.Parallel()
+	type args struct {
+		ctx context.Context
+		f   func(uuid string) bool
+	}
+	type fields struct {
+		ich              chan index
+		uii              []index
+		imu              sync.Mutex
+		uiim             map[string][]float32
+		dch              chan key
+		udk              []key
+		dmu              sync.Mutex
+		eg               errgroup.Group
+		finalizingInsert atomic.Value
+		finalizingDelete atomic.Value
+		closed           atomic.Value
+		ichSize          int
+		dchSize          int
+		iBufSize         int
+		dBufSize         int
+	}
+	type want struct{}
+	type test struct {
+		name       string
+		args       args
+		fields     fields
+		want       want
+		checkFunc  func(want) error
+		beforeFunc func(args)
+		afterFunc  func(args)
+	}
+	defaultCheckFunc := func(w want) error {
+		return nil
+	}
+	tests := []test{
+		// TODO test cases
+		/*
+		   {
+		       name: "test_case_1",
+		       args: args {
+		           ctx: nil,
+		           f: nil,
+		       },
+		       fields: fields {
+		           ich: nil,
+		           uii: nil,
+		           imu: sync.Mutex{},
+		           uiim: nil,
+		           dch: nil,
+		           udk: nil,
+		           dmu: sync.Mutex{},
+		           eg: nil,
+		           finalizingInsert: nil,
+		           finalizingDelete: nil,
+		           closed: nil,
+		           ichSize: 0,
+		           dchSize: 0,
+		           iBufSize: 0,
+		           dBufSize: 0,
+		       },
+		       want: want{},
+		       checkFunc: defaultCheckFunc,
+		   },
+		*/
+
+		// TODO test cases
+		/*
+		   func() test {
+		       return test {
+		           name: "test_case_2",
+		           args: args {
+		           ctx: nil,
+		           f: nil,
+		           },
+		           fields: fields {
+		           ich: nil,
+		           uii: nil,
+		           imu: sync.Mutex{},
+		           uiim: nil,
+		           dch: nil,
+		           udk: nil,
+		           dmu: sync.Mutex{},
+		           eg: nil,
+		           finalizingInsert: nil,
+		           finalizingDelete: nil,
+		           closed: nil,
+		           ichSize: 0,
+		           dchSize: 0,
+		           iBufSize: 0,
+		           dBufSize: 0,
+		           },
+		           want: want{},
+		           checkFunc: defaultCheckFunc,
+		       }
+		   }(),
+		*/
+	}
+
+	for _, tc := range tests {
+		test := tc
+		t.Run(test.name, func(tt *testing.T) {
+			tt.Parallel()
+			defer goleak.VerifyNone(tt, goleak.IgnoreCurrent())
+			if test.beforeFunc != nil {
+				test.beforeFunc(test.args)
+			}
+			if test.afterFunc != nil {
+				defer test.afterFunc(test.args)
+			}
+			if test.checkFunc == nil {
+				test.checkFunc = defaultCheckFunc
+			}
+			v := &vqueue{
+				ich:              test.fields.ich,
+				uii:              test.fields.uii,
+				imu:              test.fields.imu,
+				uiim:             test.fields.uiim,
+				dch:              test.fields.dch,
+				udk:              test.fields.udk,
+				dmu:              test.fields.dmu,
+				eg:               test.fields.eg,
+				finalizingInsert: test.fields.finalizingInsert,
+				finalizingDelete: test.fields.finalizingDelete,
+				closed:           test.fields.closed,
+				ichSize:          test.fields.ichSize,
+				dchSize:          test.fields.dchSize,
+				iBufSize:         test.fields.iBufSize,
+				dBufSize:         test.fields.dBufSize,
+			}
+
+			v.RangePopDelete(test.args.ctx, test.args.f)
+			if err := test.checkFunc(test.want); err != nil {
+				tt.Errorf("error = %v", err)
+			}
+		})
+	}
+}
+
+func Test_vqueue_GetVector(t *testing.T) {
+	t.Parallel()
+	type args struct {
+		uuid string
+	}
+	type fields struct {
+		ich              chan index
+		uii              []index
+		imu              sync.Mutex
+		uiim             map[string][]float32
+		dch              chan key
+		udk              []key
+		dmu              sync.Mutex
+		eg               errgroup.Group
+		finalizingInsert atomic.Value
+		finalizingDelete atomic.Value
+		closed           atomic.Value
+		ichSize          int
+		dchSize          int
+		iBufSize         int
+		dBufSize         int
+	}
+	type want struct {
+		want  []float32
+		want1 bool
+	}
+	type test struct {
+		name       string
+		args       args
+		fields     fields
+		want       want
+		checkFunc  func(want, []float32, bool) error
+		beforeFunc func(args)
+		afterFunc  func(args)
+	}
+	defaultCheckFunc := func(w want, got []float32, got1 bool) error {
+		if !reflect.DeepEqual(got, w.want) {
+			return errors.Errorf("got: \"%#v\",\n\t\t\t\twant: \"%#v\"", got, w.want)
+		}
+		if !reflect.DeepEqual(got1, w.want1) {
+			return errors.Errorf("got: \"%#v\",\n\t\t\t\twant: \"%#v\"", got1, w.want1)
+		}
+		return nil
+	}
+	tests := []test{
+		// TODO test cases
+		/*
+		   {
+		       name: "test_case_1",
+		       args: args {
+		           uuid: "",
+		       },
+		       fields: fields {
+		           ich: nil,
+		           uii: nil,
+		           imu: sync.Mutex{},
+		           uiim: nil,
+		           dch: nil,
+		           udk: nil,
+		           dmu: sync.Mutex{},
+		           eg: nil,
+		           finalizingInsert: nil,
+		           finalizingDelete: nil,
+		           closed: nil,
+		           ichSize: 0,
+		           dchSize: 0,
+		           iBufSize: 0,
+		           dBufSize: 0,
+		       },
+		       want: want{},
+		       checkFunc: defaultCheckFunc,
+		   },
+		*/
+
+		// TODO test cases
+		/*
+		   func() test {
+		       return test {
+		           name: "test_case_2",
+		           args: args {
+		           uuid: "",
+		           },
+		           fields: fields {
+		           ich: nil,
+		           uii: nil,
+		           imu: sync.Mutex{},
+		           uiim: nil,
+		           dch: nil,
+		           udk: nil,
+		           dmu: sync.Mutex{},
+		           eg: nil,
+		           finalizingInsert: nil,
+		           finalizingDelete: nil,
+		           closed: nil,
+		           ichSize: 0,
+		           dchSize: 0,
+		           iBufSize: 0,
+		           dBufSize: 0,
+		           },
+		           want: want{},
+		           checkFunc: defaultCheckFunc,
+		       }
+		   }(),
+		*/
+	}
+
+	for _, tc := range tests {
+		test := tc
+		t.Run(test.name, func(tt *testing.T) {
+			tt.Parallel()
+			defer goleak.VerifyNone(tt, goleak.IgnoreCurrent())
+			if test.beforeFunc != nil {
+				test.beforeFunc(test.args)
+			}
+			if test.afterFunc != nil {
+				defer test.afterFunc(test.args)
+			}
+			if test.checkFunc == nil {
+				test.checkFunc = defaultCheckFunc
+			}
+			v := &vqueue{
+				ich:              test.fields.ich,
+				uii:              test.fields.uii,
+				imu:              test.fields.imu,
+				uiim:             test.fields.uiim,
+				dch:              test.fields.dch,
+				udk:              test.fields.udk,
+				dmu:              test.fields.dmu,
+				eg:               test.fields.eg,
+				finalizingInsert: test.fields.finalizingInsert,
+				finalizingDelete: test.fields.finalizingDelete,
+				closed:           test.fields.closed,
+				ichSize:          test.fields.ichSize,
+				dchSize:          test.fields.dchSize,
+				iBufSize:         test.fields.iBufSize,
+				dBufSize:         test.fields.dBufSize,
+			}
+
+			got, got1 := v.GetVector(test.args.uuid)
+			if err := test.checkFunc(test.want, got, got1); err != nil {
+				tt.Errorf("error = %v", err)
+			}
+		})
+	}
+}
+
+func Test_vqueue_addInsert(t *testing.T) {
+	t.Parallel()
+	type args struct {
+		i index
+	}
+	type fields struct {
+		ich              chan index
+		uii              []index
+		imu              sync.Mutex
+		uiim             map[string][]float32
+		dch              chan key
+		udk              []key
+		dmu              sync.Mutex
+		eg               errgroup.Group
+		finalizingInsert atomic.Value
+		finalizingDelete atomic.Value
+		closed           atomic.Value
+		ichSize          int
+		dchSize          int
+		iBufSize         int
+		dBufSize         int
+	}
+	type want struct{}
+	type test struct {
+		name       string
+		args       args
+		fields     fields
+		want       want
+		checkFunc  func(want) error
+		beforeFunc func(args)
+		afterFunc  func(args)
+	}
+	defaultCheckFunc := func(w want) error {
+		return nil
+	}
+	tests := []test{
+		// TODO test cases
+		/*
+		   {
+		       name: "test_case_1",
+		       args: args {
+		           i: index{},
+		       },
+		       fields: fields {
+		           ich: nil,
+		           uii: nil,
+		           imu: sync.Mutex{},
+		           uiim: nil,
+		           dch: nil,
+		           udk: nil,
+		           dmu: sync.Mutex{},
+		           eg: nil,
+		           finalizingInsert: nil,
+		           finalizingDelete: nil,
+		           closed: nil,
+		           ichSize: 0,
+		           dchSize: 0,
+		           iBufSize: 0,
+		           dBufSize: 0,
+		       },
+		       want: want{},
+		       checkFunc: defaultCheckFunc,
+		   },
+		*/
+
+		// TODO test cases
+		/*
+		   func() test {
+		       return test {
+		           name: "test_case_2",
+		           args: args {
+		           i: index{},
+		           },
+		           fields: fields {
+		           ich: nil,
+		           uii: nil,
+		           imu: sync.Mutex{},
+		           uiim: nil,
+		           dch: nil,
+		           udk: nil,
+		           dmu: sync.Mutex{},
+		           eg: nil,
+		           finalizingInsert: nil,
+		           finalizingDelete: nil,
+		           closed: nil,
+		           ichSize: 0,
+		           dchSize: 0,
+		           iBufSize: 0,
+		           dBufSize: 0,
+		           },
+		           want: want{},
+		           checkFunc: defaultCheckFunc,
+		       }
+		   }(),
+		*/
+	}
+
+	for _, tc := range tests {
+		test := tc
+		t.Run(test.name, func(tt *testing.T) {
+			tt.Parallel()
+			defer goleak.VerifyNone(tt, goleak.IgnoreCurrent())
+			if test.beforeFunc != nil {
+				test.beforeFunc(test.args)
+			}
+			if test.afterFunc != nil {
+				defer test.afterFunc(test.args)
+			}
+			if test.checkFunc == nil {
+				test.checkFunc = defaultCheckFunc
+			}
+			v := &vqueue{
+				ich:              test.fields.ich,
+				uii:              test.fields.uii,
+				imu:              test.fields.imu,
+				uiim:             test.fields.uiim,
+				dch:              test.fields.dch,
+				udk:              test.fields.udk,
+				dmu:              test.fields.dmu,
+				eg:               test.fields.eg,
+				finalizingInsert: test.fields.finalizingInsert,
+				finalizingDelete: test.fields.finalizingDelete,
+				closed:           test.fields.closed,
+				ichSize:          test.fields.ichSize,
+				dchSize:          test.fields.dchSize,
+				iBufSize:         test.fields.iBufSize,
+				dBufSize:         test.fields.dBufSize,
+			}
+
+			v.addInsert(test.args.i)
+			if err := test.checkFunc(test.want); err != nil {
+				tt.Errorf("error = %v", err)
+			}
+		})
+	}
+}
+
+func Test_vqueue_addDelete(t *testing.T) {
+	t.Parallel()
+	type args struct {
+		d key
+	}
+	type fields struct {
+		ich              chan index
+		uii              []index
+		imu              sync.Mutex
+		uiim             map[string][]float32
+		dch              chan key
+		udk              []key
+		dmu              sync.Mutex
+		eg               errgroup.Group
+		finalizingInsert atomic.Value
+		finalizingDelete atomic.Value
+		closed           atomic.Value
+		ichSize          int
+		dchSize          int
+		iBufSize         int
+		dBufSize         int
+	}
+	type want struct{}
+	type test struct {
+		name       string
+		args       args
+		fields     fields
+		want       want
+		checkFunc  func(want) error
+		beforeFunc func(args)
+		afterFunc  func(args)
+	}
+	defaultCheckFunc := func(w want) error {
+		return nil
+	}
+	tests := []test{
+		// TODO test cases
+		/*
+		   {
+		       name: "test_case_1",
+		       args: args {
+		           d: key{},
+		       },
+		       fields: fields {
+		           ich: nil,
+		           uii: nil,
+		           imu: sync.Mutex{},
+		           uiim: nil,
+		           dch: nil,
+		           udk: nil,
+		           dmu: sync.Mutex{},
+		           eg: nil,
+		           finalizingInsert: nil,
+		           finalizingDelete: nil,
+		           closed: nil,
+		           ichSize: 0,
+		           dchSize: 0,
+		           iBufSize: 0,
+		           dBufSize: 0,
+		       },
+		       want: want{},
+		       checkFunc: defaultCheckFunc,
+		   },
+		*/
+
+		// TODO test cases
+		/*
+		   func() test {
+		       return test {
+		           name: "test_case_2",
+		           args: args {
+		           d: key{},
+		           },
+		           fields: fields {
+		           ich: nil,
+		           uii: nil,
+		           imu: sync.Mutex{},
+		           uiim: nil,
+		           dch: nil,
+		           udk: nil,
+		           dmu: sync.Mutex{},
+		           eg: nil,
+		           finalizingInsert: nil,
+		           finalizingDelete: nil,
+		           closed: nil,
+		           ichSize: 0,
+		           dchSize: 0,
+		           iBufSize: 0,
+		           dBufSize: 0,
+		           },
+		           want: want{},
+		           checkFunc: defaultCheckFunc,
+		       }
+		   }(),
+		*/
+	}
+
+	for _, tc := range tests {
+		test := tc
+		t.Run(test.name, func(tt *testing.T) {
+			tt.Parallel()
+			defer goleak.VerifyNone(tt, goleak.IgnoreCurrent())
+			if test.beforeFunc != nil {
+				test.beforeFunc(test.args)
+			}
+			if test.afterFunc != nil {
+				defer test.afterFunc(test.args)
+			}
+			if test.checkFunc == nil {
+				test.checkFunc = defaultCheckFunc
+			}
+			v := &vqueue{
+				ich:              test.fields.ich,
+				uii:              test.fields.uii,
+				imu:              test.fields.imu,
+				uiim:             test.fields.uiim,
+				dch:              test.fields.dch,
+				udk:              test.fields.udk,
+				dmu:              test.fields.dmu,
+				eg:               test.fields.eg,
+				finalizingInsert: test.fields.finalizingInsert,
+				finalizingDelete: test.fields.finalizingDelete,
+				closed:           test.fields.closed,
+				ichSize:          test.fields.ichSize,
+				dchSize:          test.fields.dchSize,
+				iBufSize:         test.fields.iBufSize,
+				dBufSize:         test.fields.dBufSize,
+			}
+
+			v.addDelete(test.args.d)
+			if err := test.checkFunc(test.want); err != nil {
+				tt.Errorf("error = %v", err)
+			}
+		})
+	}
+}
+
+func Test_vqueue_flushAndLoadInsert(t *testing.T) {
+	t.Parallel()
+	type fields struct {
+		ich              chan index
+		uii              []index
+		imu              sync.Mutex
+		uiim             map[string][]float32
+		dch              chan key
+		udk              []key
+		dmu              sync.Mutex
+		eg               errgroup.Group
+		finalizingInsert atomic.Value
+		finalizingDelete atomic.Value
+		closed           atomic.Value
+		ichSize          int
+		dchSize          int
+		iBufSize         int
+		dBufSize         int
+	}
+	type want struct {
+		wantUii []index
+	}
+	type test struct {
+		name       string
+		fields     fields
+		want       want
+		checkFunc  func(want, []index) error
+		beforeFunc func()
+		afterFunc  func()
+	}
+	defaultCheckFunc := func(w want, gotUii []index) error {
+		if !reflect.DeepEqual(gotUii, w.wantUii) {
+			return errors.Errorf("got: \"%#v\",\n\t\t\t\twant: \"%#v\"", gotUii, w.wantUii)
+		}
+		return nil
+	}
+	tests := []test{
+		// TODO test cases
+		/*
+		   {
+		       name: "test_case_1",
+		       fields: fields {
+		           ich: nil,
+		           uii: nil,
+		           imu: sync.Mutex{},
+		           uiim: nil,
+		           dch: nil,
+		           udk: nil,
+		           dmu: sync.Mutex{},
+		           eg: nil,
+		           finalizingInsert: nil,
+		           finalizingDelete: nil,
+		           closed: nil,
+		           ichSize: 0,
+		           dchSize: 0,
+		           iBufSize: 0,
+		           dBufSize: 0,
+		       },
+		       want: want{},
+		       checkFunc: defaultCheckFunc,
+		   },
+		*/
+
+		// TODO test cases
+		/*
+		   func() test {
+		       return test {
+		           name: "test_case_2",
+		           fields: fields {
+		           ich: nil,
+		           uii: nil,
+		           imu: sync.Mutex{},
+		           uiim: nil,
+		           dch: nil,
+		           udk: nil,
+		           dmu: sync.Mutex{},
+		           eg: nil,
+		           finalizingInsert: nil,
+		           finalizingDelete: nil,
+		           closed: nil,
+		           ichSize: 0,
+		           dchSize: 0,
+		           iBufSize: 0,
+		           dBufSize: 0,
+		           },
+		           want: want{},
+		           checkFunc: defaultCheckFunc,
+		       }
+		   }(),
+		*/
+	}
+
+	for _, tc := range tests {
+		test := tc
+		t.Run(test.name, func(tt *testing.T) {
+			tt.Parallel()
+			defer goleak.VerifyNone(tt, goleak.IgnoreCurrent())
+			if test.beforeFunc != nil {
+				test.beforeFunc()
+			}
+			if test.afterFunc != nil {
+				defer test.afterFunc()
+			}
+			if test.checkFunc == nil {
+				test.checkFunc = defaultCheckFunc
+			}
+			v := &vqueue{
+				ich:              test.fields.ich,
+				uii:              test.fields.uii,
+				imu:              test.fields.imu,
+				uiim:             test.fields.uiim,
+				dch:              test.fields.dch,
+				udk:              test.fields.udk,
+				dmu:              test.fields.dmu,
+				eg:               test.fields.eg,
+				finalizingInsert: test.fields.finalizingInsert,
+				finalizingDelete: test.fields.finalizingDelete,
+				closed:           test.fields.closed,
+				ichSize:          test.fields.ichSize,
+				dchSize:          test.fields.dchSize,
+				iBufSize:         test.fields.iBufSize,
+				dBufSize:         test.fields.dBufSize,
+			}
+
+			gotUii := v.flushAndLoadInsert()
+			if err := test.checkFunc(test.want, gotUii); err != nil {
+				tt.Errorf("error = %v", err)
+			}
+		})
+	}
+}
+
+func Test_vqueue_flushAndLoadDelete(t *testing.T) {
+	t.Parallel()
+	type fields struct {
+		ich              chan index
+		uii              []index
+		imu              sync.Mutex
+		uiim             map[string][]float32
+		dch              chan key
+		udk              []key
+		dmu              sync.Mutex
+		eg               errgroup.Group
+		finalizingInsert atomic.Value
+		finalizingDelete atomic.Value
+		closed           atomic.Value
+		ichSize          int
+		dchSize          int
+		iBufSize         int
+		dBufSize         int
+	}
+	type want struct {
+		wantUdk []key
+	}
+	type test struct {
+		name       string
+		fields     fields
+		want       want
+		checkFunc  func(want, []key) error
+		beforeFunc func()
+		afterFunc  func()
+	}
+	defaultCheckFunc := func(w want, gotUdk []key) error {
+		if !reflect.DeepEqual(gotUdk, w.wantUdk) {
+			return errors.Errorf("got: \"%#v\",\n\t\t\t\twant: \"%#v\"", gotUdk, w.wantUdk)
+		}
+		return nil
+	}
+	tests := []test{
+		// TODO test cases
+		/*
+		   {
+		       name: "test_case_1",
+		       fields: fields {
+		           ich: nil,
+		           uii: nil,
+		           imu: sync.Mutex{},
+		           uiim: nil,
+		           dch: nil,
+		           udk: nil,
+		           dmu: sync.Mutex{},
+		           eg: nil,
+		           finalizingInsert: nil,
+		           finalizingDelete: nil,
+		           closed: nil,
+		           ichSize: 0,
+		           dchSize: 0,
+		           iBufSize: 0,
+		           dBufSize: 0,
+		       },
+		       want: want{},
+		       checkFunc: defaultCheckFunc,
+		   },
+		*/
+
+		// TODO test cases
+		/*
+		   func() test {
+		       return test {
+		           name: "test_case_2",
+		           fields: fields {
+		           ich: nil,
+		           uii: nil,
+		           imu: sync.Mutex{},
+		           uiim: nil,
+		           dch: nil,
+		           udk: nil,
+		           dmu: sync.Mutex{},
+		           eg: nil,
+		           finalizingInsert: nil,
+		           finalizingDelete: nil,
+		           closed: nil,
+		           ichSize: 0,
+		           dchSize: 0,
+		           iBufSize: 0,
+		           dBufSize: 0,
+		           },
+		           want: want{},
+		           checkFunc: defaultCheckFunc,
+		       }
+		   }(),
+		*/
+	}
+
+	for _, tc := range tests {
+		test := tc
+		t.Run(test.name, func(tt *testing.T) {
+			tt.Parallel()
+			defer goleak.VerifyNone(tt, goleak.IgnoreCurrent())
+			if test.beforeFunc != nil {
+				test.beforeFunc()
+			}
+			if test.afterFunc != nil {
+				defer test.afterFunc()
+			}
+			if test.checkFunc == nil {
+				test.checkFunc = defaultCheckFunc
+			}
+			v := &vqueue{
+				ich:              test.fields.ich,
+				uii:              test.fields.uii,
+				imu:              test.fields.imu,
+				uiim:             test.fields.uiim,
+				dch:              test.fields.dch,
+				udk:              test.fields.udk,
+				dmu:              test.fields.dmu,
+				eg:               test.fields.eg,
+				finalizingInsert: test.fields.finalizingInsert,
+				finalizingDelete: test.fields.finalizingDelete,
+				closed:           test.fields.closed,
+				ichSize:          test.fields.ichSize,
+				dchSize:          test.fields.dchSize,
+				iBufSize:         test.fields.iBufSize,
+				dBufSize:         test.fields.dBufSize,
+			}
+
+			gotUdk := v.flushAndLoadDelete()
+			if err := test.checkFunc(test.want, gotUdk); err != nil {
+				tt.Errorf("error = %v", err)
+			}
+		})
+	}
+}
+
+func Test_vqueue_IVQLen(t *testing.T) {
+	t.Parallel()
+	type fields struct {
+		ich              chan index
+		uii              []index
+		imu              sync.Mutex
+		uiim             map[string][]float32
+		dch              chan key
+		udk              []key
+		dmu              sync.Mutex
+		eg               errgroup.Group
+		finalizingInsert atomic.Value
+		finalizingDelete atomic.Value
+		closed           atomic.Value
+		ichSize          int
+		dchSize          int
+		iBufSize         int
+		dBufSize         int
+	}
+	type want struct {
+		wantL int
+	}
+	type test struct {
+		name       string
+		fields     fields
+		want       want
+		checkFunc  func(want, int) error
+		beforeFunc func()
+		afterFunc  func()
+	}
+	defaultCheckFunc := func(w want, gotL int) error {
+		if !reflect.DeepEqual(gotL, w.wantL) {
+			return errors.Errorf("got: \"%#v\",\n\t\t\t\twant: \"%#v\"", gotL, w.wantL)
+		}
+		return nil
+	}
+	tests := []test{
+		// TODO test cases
+		/*
+		   {
+		       name: "test_case_1",
+		       fields: fields {
+		           ich: nil,
+		           uii: nil,
+		           imu: sync.Mutex{},
+		           uiim: nil,
+		           dch: nil,
+		           udk: nil,
+		           dmu: sync.Mutex{},
+		           eg: nil,
+		           finalizingInsert: nil,
+		           finalizingDelete: nil,
+		           closed: nil,
+		           ichSize: 0,
+		           dchSize: 0,
+		           iBufSize: 0,
+		           dBufSize: 0,
+		       },
+		       want: want{},
+		       checkFunc: defaultCheckFunc,
+		   },
+		*/
+
+		// TODO test cases
+		/*
+		   func() test {
+		       return test {
+		           name: "test_case_2",
+		           fields: fields {
+		           ich: nil,
+		           uii: nil,
+		           imu: sync.Mutex{},
+		           uiim: nil,
+		           dch: nil,
+		           udk: nil,
+		           dmu: sync.Mutex{},
+		           eg: nil,
+		           finalizingInsert: nil,
+		           finalizingDelete: nil,
+		           closed: nil,
+		           ichSize: 0,
+		           dchSize: 0,
+		           iBufSize: 0,
+		           dBufSize: 0,
+		           },
+		           want: want{},
+		           checkFunc: defaultCheckFunc,
+		       }
+		   }(),
+		*/
+	}
+
+	for _, tc := range tests {
+		test := tc
+		t.Run(test.name, func(tt *testing.T) {
+			tt.Parallel()
+			defer goleak.VerifyNone(tt, goleak.IgnoreCurrent())
+			if test.beforeFunc != nil {
+				test.beforeFunc()
+			}
+			if test.afterFunc != nil {
+				defer test.afterFunc()
+			}
+			if test.checkFunc == nil {
+				test.checkFunc = defaultCheckFunc
+			}
+			v := &vqueue{
+				ich:              test.fields.ich,
+				uii:              test.fields.uii,
+				imu:              test.fields.imu,
+				uiim:             test.fields.uiim,
+				dch:              test.fields.dch,
+				udk:              test.fields.udk,
+				dmu:              test.fields.dmu,
+				eg:               test.fields.eg,
+				finalizingInsert: test.fields.finalizingInsert,
+				finalizingDelete: test.fields.finalizingDelete,
+				closed:           test.fields.closed,
+				ichSize:          test.fields.ichSize,
+				dchSize:          test.fields.dchSize,
+				iBufSize:         test.fields.iBufSize,
+				dBufSize:         test.fields.dBufSize,
+			}
+
+			gotL := v.IVQLen()
+			if err := test.checkFunc(test.want, gotL); err != nil {
+				tt.Errorf("error = %v", err)
+			}
+		})
+	}
+}
+
+func Test_vqueue_DVQLen(t *testing.T) {
+	t.Parallel()
+	type fields struct {
+		ich              chan index
+		uii              []index
+		imu              sync.Mutex
+		uiim             map[string][]float32
+		dch              chan key
+		udk              []key
+		dmu              sync.Mutex
+		eg               errgroup.Group
+		finalizingInsert atomic.Value
+		finalizingDelete atomic.Value
+		closed           atomic.Value
+		ichSize          int
+		dchSize          int
+		iBufSize         int
+		dBufSize         int
+	}
+	type want struct {
+		wantL int
+	}
+	type test struct {
+		name       string
+		fields     fields
+		want       want
+		checkFunc  func(want, int) error
+		beforeFunc func()
+		afterFunc  func()
+	}
+	defaultCheckFunc := func(w want, gotL int) error {
+		if !reflect.DeepEqual(gotL, w.wantL) {
+			return errors.Errorf("got: \"%#v\",\n\t\t\t\twant: \"%#v\"", gotL, w.wantL)
+		}
+		return nil
+	}
+	tests := []test{
+		// TODO test cases
+		/*
+		   {
+		       name: "test_case_1",
+		       fields: fields {
+		           ich: nil,
+		           uii: nil,
+		           imu: sync.Mutex{},
+		           uiim: nil,
+		           dch: nil,
+		           udk: nil,
+		           dmu: sync.Mutex{},
+		           eg: nil,
+		           finalizingInsert: nil,
+		           finalizingDelete: nil,
+		           closed: nil,
+		           ichSize: 0,
+		           dchSize: 0,
+		           iBufSize: 0,
+		           dBufSize: 0,
+		       },
+		       want: want{},
+		       checkFunc: defaultCheckFunc,
+		   },
+		*/
+
+		// TODO test cases
+		/*
+		   func() test {
+		       return test {
+		           name: "test_case_2",
+		           fields: fields {
+		           ich: nil,
+		           uii: nil,
+		           imu: sync.Mutex{},
+		           uiim: nil,
+		           dch: nil,
+		           udk: nil,
+		           dmu: sync.Mutex{},
+		           eg: nil,
+		           finalizingInsert: nil,
+		           finalizingDelete: nil,
+		           closed: nil,
+		           ichSize: 0,
+		           dchSize: 0,
+		           iBufSize: 0,
+		           dBufSize: 0,
+		           },
+		           want: want{},
+		           checkFunc: defaultCheckFunc,
+		       }
+		   }(),
+		*/
+	}
+
+	for _, tc := range tests {
+		test := tc
+		t.Run(test.name, func(tt *testing.T) {
+			tt.Parallel()
+			defer goleak.VerifyNone(tt, goleak.IgnoreCurrent())
+			if test.beforeFunc != nil {
+				test.beforeFunc()
+			}
+			if test.afterFunc != nil {
+				defer test.afterFunc()
+			}
+			if test.checkFunc == nil {
+				test.checkFunc = defaultCheckFunc
+			}
+			v := &vqueue{
+				ich:              test.fields.ich,
+				uii:              test.fields.uii,
+				imu:              test.fields.imu,
+				uiim:             test.fields.uiim,
+				dch:              test.fields.dch,
+				udk:              test.fields.udk,
+				dmu:              test.fields.dmu,
+				eg:               test.fields.eg,
+				finalizingInsert: test.fields.finalizingInsert,
+				finalizingDelete: test.fields.finalizingDelete,
+				closed:           test.fields.closed,
+				ichSize:          test.fields.ichSize,
+				dchSize:          test.fields.dchSize,
+				iBufSize:         test.fields.iBufSize,
+				dBufSize:         test.fields.dBufSize,
+			}
+
+			gotL := v.DVQLen()
+			if err := test.checkFunc(test.want, gotL); err != nil {
+				tt.Errorf("error = %v", err)
+			}
+		})
+	}
+}
+
+func Test_vqueue_IVCLen(t *testing.T) {
+	t.Parallel()
+	type fields struct {
+		ich              chan index
+		uii              []index
+		imu              sync.Mutex
+		uiim             map[string][]float32
+		dch              chan key
+		udk              []key
+		dmu              sync.Mutex
+		eg               errgroup.Group
+		finalizingInsert atomic.Value
+		finalizingDelete atomic.Value
+		closed           atomic.Value
+		ichSize          int
+		dchSize          int
+		iBufSize         int
+		dBufSize         int
+	}
+	type want struct {
+		want int
+	}
+	type test struct {
+		name       string
+		fields     fields
+		want       want
+		checkFunc  func(want, int) error
+		beforeFunc func()
+		afterFunc  func()
+	}
+	defaultCheckFunc := func(w want, got int) error {
+		if !reflect.DeepEqual(got, w.want) {
+			return errors.Errorf("got: \"%#v\",\n\t\t\t\twant: \"%#v\"", got, w.want)
+		}
+		return nil
+	}
+	tests := []test{
+		// TODO test cases
+		/*
+		   {
+		       name: "test_case_1",
+		       fields: fields {
+		           ich: nil,
+		           uii: nil,
+		           imu: sync.Mutex{},
+		           uiim: nil,
+		           dch: nil,
+		           udk: nil,
+		           dmu: sync.Mutex{},
+		           eg: nil,
+		           finalizingInsert: nil,
+		           finalizingDelete: nil,
+		           closed: nil,
+		           ichSize: 0,
+		           dchSize: 0,
+		           iBufSize: 0,
+		           dBufSize: 0,
+		       },
+		       want: want{},
+		       checkFunc: defaultCheckFunc,
+		   },
+		*/
+
+		// TODO test cases
+		/*
+		   func() test {
+		       return test {
+		           name: "test_case_2",
+		           fields: fields {
+		           ich: nil,
+		           uii: nil,
+		           imu: sync.Mutex{},
+		           uiim: nil,
+		           dch: nil,
+		           udk: nil,
+		           dmu: sync.Mutex{},
+		           eg: nil,
+		           finalizingInsert: nil,
+		           finalizingDelete: nil,
+		           closed: nil,
+		           ichSize: 0,
+		           dchSize: 0,
+		           iBufSize: 0,
+		           dBufSize: 0,
+		           },
+		           want: want{},
+		           checkFunc: defaultCheckFunc,
+		       }
+		   }(),
+		*/
+	}
+
+	for _, tc := range tests {
+		test := tc
+		t.Run(test.name, func(tt *testing.T) {
+			tt.Parallel()
+			defer goleak.VerifyNone(tt, goleak.IgnoreCurrent())
+			if test.beforeFunc != nil {
+				test.beforeFunc()
+			}
+			if test.afterFunc != nil {
+				defer test.afterFunc()
+			}
+			if test.checkFunc == nil {
+				test.checkFunc = defaultCheckFunc
+			}
+			v := &vqueue{
+				ich:              test.fields.ich,
+				uii:              test.fields.uii,
+				imu:              test.fields.imu,
+				uiim:             test.fields.uiim,
+				dch:              test.fields.dch,
+				udk:              test.fields.udk,
+				dmu:              test.fields.dmu,
+				eg:               test.fields.eg,
+				finalizingInsert: test.fields.finalizingInsert,
+				finalizingDelete: test.fields.finalizingDelete,
+				closed:           test.fields.closed,
+				ichSize:          test.fields.ichSize,
+				dchSize:          test.fields.dchSize,
+				iBufSize:         test.fields.iBufSize,
+				dBufSize:         test.fields.dBufSize,
+			}
+
+			got := v.IVCLen()
+			if err := test.checkFunc(test.want, got); err != nil {
+				tt.Errorf("error = %v", err)
+			}
+		})
+	}
+}
+
+func Test_vqueue_DVCLen(t *testing.T) {
+	t.Parallel()
+	type fields struct {
+		ich              chan index
+		uii              []index
+		imu              sync.Mutex
+		uiim             map[string][]float32
+		dch              chan key
+		udk              []key
+		dmu              sync.Mutex
+		eg               errgroup.Group
+		finalizingInsert atomic.Value
+		finalizingDelete atomic.Value
+		closed           atomic.Value
+		ichSize          int
+		dchSize          int
+		iBufSize         int
+		dBufSize         int
+	}
+	type want struct {
+		want int
+	}
+	type test struct {
+		name       string
+		fields     fields
+		want       want
+		checkFunc  func(want, int) error
+		beforeFunc func()
+		afterFunc  func()
+	}
+	defaultCheckFunc := func(w want, got int) error {
+		if !reflect.DeepEqual(got, w.want) {
+			return errors.Errorf("got: \"%#v\",\n\t\t\t\twant: \"%#v\"", got, w.want)
+		}
+		return nil
+	}
+	tests := []test{
+		// TODO test cases
+		/*
+		   {
+		       name: "test_case_1",
+		       fields: fields {
+		           ich: nil,
+		           uii: nil,
+		           imu: sync.Mutex{},
+		           uiim: nil,
+		           dch: nil,
+		           udk: nil,
+		           dmu: sync.Mutex{},
+		           eg: nil,
+		           finalizingInsert: nil,
+		           finalizingDelete: nil,
+		           closed: nil,
+		           ichSize: 0,
+		           dchSize: 0,
+		           iBufSize: 0,
+		           dBufSize: 0,
+		       },
+		       want: want{},
+		       checkFunc: defaultCheckFunc,
+		   },
+		*/
+
+		// TODO test cases
+		/*
+		   func() test {
+		       return test {
+		           name: "test_case_2",
+		           fields: fields {
+		           ich: nil,
+		           uii: nil,
+		           imu: sync.Mutex{},
+		           uiim: nil,
+		           dch: nil,
+		           udk: nil,
+		           dmu: sync.Mutex{},
+		           eg: nil,
+		           finalizingInsert: nil,
+		           finalizingDelete: nil,
+		           closed: nil,
+		           ichSize: 0,
+		           dchSize: 0,
+		           iBufSize: 0,
+		           dBufSize: 0,
+		           },
+		           want: want{},
+		           checkFunc: defaultCheckFunc,
+		       }
+		   }(),
+		*/
+	}
+
+	for _, tc := range tests {
+		test := tc
+		t.Run(test.name, func(tt *testing.T) {
+			tt.Parallel()
+			defer goleak.VerifyNone(tt, goleak.IgnoreCurrent())
+			if test.beforeFunc != nil {
+				test.beforeFunc()
+			}
+			if test.afterFunc != nil {
+				defer test.afterFunc()
+			}
+			if test.checkFunc == nil {
+				test.checkFunc = defaultCheckFunc
+			}
+			v := &vqueue{
+				ich:              test.fields.ich,
+				uii:              test.fields.uii,
+				imu:              test.fields.imu,
+				uiim:             test.fields.uiim,
+				dch:              test.fields.dch,
+				udk:              test.fields.udk,
+				dmu:              test.fields.dmu,
+				eg:               test.fields.eg,
+				finalizingInsert: test.fields.finalizingInsert,
+				finalizingDelete: test.fields.finalizingDelete,
+				closed:           test.fields.closed,
+				ichSize:          test.fields.ichSize,
+				dchSize:          test.fields.dchSize,
+				iBufSize:         test.fields.iBufSize,
+				dBufSize:         test.fields.dBufSize,
+			}
+
+			got := v.DVCLen()
+			if err := test.checkFunc(test.want, got); err != nil {
+				tt.Errorf("error = %v", err)
+			}
+		})
+	}
+}
diff --git a/pkg/discoverer/k8s/service/discover_test.go b/pkg/discoverer/k8s/service/discover_test.go
index e350f15101..0351f01b9c 100644
--- a/pkg/discoverer/k8s/service/discover_test.go
+++ b/pkg/discoverer/k8s/service/discover_test.go
@@ -28,6 +28,7 @@ import (
 	"github.com/vdaas/vald/internal/errgroup"
 	"github.com/vdaas/vald/internal/errors"
 	"github.com/vdaas/vald/internal/k8s"
+	"github.com/vdaas/vald/internal/net"
 	"go.uber.org/goleak"
 )
 
@@ -127,6 +128,7 @@ func Test_discoverer_Start(t *testing.T) {
 		namespace       string
 		name            string
 		csd             time.Duration
+		der             net.Dialer
 		eg              errgroup.Group
 	}
 	type want struct {
@@ -173,6 +175,7 @@ func Test_discoverer_Start(t *testing.T) {
 		           namespace: "",
 		           name: "",
 		           csd: nil,
+		           der: nil,
 		           eg: nil,
 		       },
 		       want: want{},
@@ -202,6 +205,7 @@ func Test_discoverer_Start(t *testing.T) {
 		           namespace: "",
 		           name: "",
 		           csd: nil,
+		           der: nil,
 		           eg: nil,
 		           },
 		           want: want{},
@@ -239,6 +243,7 @@ func Test_discoverer_Start(t *testing.T) {
 				namespace:       test.fields.namespace,
 				name:            test.fields.name,
 				csd:             test.fields.csd,
+				der:             test.fields.der,
 				eg:              test.fields.eg,
 			}
 
@@ -269,6 +274,7 @@ func Test_discoverer_GetPods(t *testing.T) {
 		namespace       string
 		name            string
 		csd             time.Duration
+		der             net.Dialer
 		eg              errgroup.Group
 	}
 	type want struct {
@@ -315,6 +321,7 @@ func Test_discoverer_GetPods(t *testing.T) {
 		           namespace: "",
 		           name: "",
 		           csd: nil,
+		           der: nil,
 		           eg: nil,
 		       },
 		       want: want{},
@@ -344,6 +351,7 @@ func Test_discoverer_GetPods(t *testing.T) {
 		           namespace: "",
 		           name: "",
 		           csd: nil,
+		           der: nil,
 		           eg: nil,
 		           },
 		           want: want{},
@@ -381,6 +389,7 @@ func Test_discoverer_GetPods(t *testing.T) {
 				namespace:       test.fields.namespace,
 				name:            test.fields.name,
 				csd:             test.fields.csd,
+				der:             test.fields.der,
 				eg:              test.fields.eg,
 			}
 
@@ -411,6 +420,7 @@ func Test_discoverer_GetNodes(t *testing.T) {
 		namespace       string
 		name            string
 		csd             time.Duration
+		der             net.Dialer
 		eg              errgroup.Group
 	}
 	type want struct {
@@ -457,6 +467,7 @@ func Test_discoverer_GetNodes(t *testing.T) {
 		           namespace: "",
 		           name: "",
 		           csd: nil,
+		           der: nil,
 		           eg: nil,
 		       },
 		       want: want{},
@@ -486,6 +497,7 @@ func Test_discoverer_GetNodes(t *testing.T) {
 		           namespace: "",
 		           name: "",
 		           csd: nil,
+		           der: nil,
 		           eg: nil,
 		           },
 		           want: want{},
@@ -523,6 +535,7 @@ func Test_discoverer_GetNodes(t *testing.T) {
 				namespace:       test.fields.namespace,
 				name:            test.fields.name,
 				csd:             test.fields.csd,
+				der:             test.fields.der,
 				eg:              test.fields.eg,
 			}
 
diff --git a/pkg/discoverer/k8s/service/option_test.go b/pkg/discoverer/k8s/service/option_test.go
index aa127a6909..4d77139c46 100644
--- a/pkg/discoverer/k8s/service/option_test.go
+++ b/pkg/discoverer/k8s/service/option_test.go
@@ -25,12 +25,12 @@ import (
 	"go.uber.org/goleak"
 )
 
-func TestWithName(t *testing.T) {
+func TestWithDialer(t *testing.T) {
 	t.Parallel()
 	// Change interface type to the type of object you are testing
 	type T = interface{}
 	type args struct {
-		name string
+		der net.Dialer
 	}
 	type want struct {
 		obj *T
@@ -77,7 +77,7 @@ func TestWithName(t *testing.T) {
 		   {
 		       name: "test_case_1",
 		       args: args {
-		           name: "",
+		           der: nil,
 		       },
 		       want: want {
 		           obj: new(T),
@@ -91,7 +91,7 @@ func TestWithName(t *testing.T) {
 		       return test {
 		           name: "test_case_2",
 		           args: args {
-		           name: "",
+		           der: nil,
 		           },
 		           want: want {
 		               obj: new(T),
@@ -119,7 +119,7 @@ func TestWithName(t *testing.T) {
 			       test.checkFunc = defaultCheckFunc
 			   }
 
-			   got := WithName(test.args.name)
+			   got := WithDialer(test.args.der)
 			   obj := new(T)
 			   if err := test.checkFunc(test.want, obj, got(obj)); err != nil {
 			       tt.Errorf("error = %v", err)
@@ -131,7 +131,7 @@ func TestWithName(t *testing.T) {
 			   if test.checkFunc == nil {
 			       test.checkFunc = defaultCheckFunc
 			   }
-			   got := WithName(test.args.name)
+			   got := WithDialer(test.args.der)
 			   obj := new(T)
 			   got(obj)
 			   if err := test.checkFunc(test.want, obj); err != nil {
@@ -142,12 +142,12 @@ func TestWithName(t *testing.T) {
 	}
 }
 
-func TestWithNamespace(t *testing.T) {
+func TestWithName(t *testing.T) {
 	t.Parallel()
 	// Change interface type to the type of object you are testing
 	type T = interface{}
 	type args struct {
-		ns string
+		name string
 	}
 	type want struct {
 		obj *T
@@ -194,7 +194,7 @@ func TestWithNamespace(t *testing.T) {
 		   {
 		       name: "test_case_1",
 		       args: args {
-		           ns: "",
+		           name: "",
 		       },
 		       want: want {
 		           obj: new(T),
@@ -208,7 +208,7 @@ func TestWithNamespace(t *testing.T) {
 		       return test {
 		           name: "test_case_2",
 		           args: args {
-		           ns: "",
+		           name: "",
 		           },
 		           want: want {
 		               obj: new(T),
@@ -236,7 +236,7 @@ func TestWithNamespace(t *testing.T) {
 			       test.checkFunc = defaultCheckFunc
 			   }
 
-			   got := WithNamespace(test.args.ns)
+			   got := WithName(test.args.name)
 			   obj := new(T)
 			   if err := test.checkFunc(test.want, obj, got(obj)); err != nil {
 			       tt.Errorf("error = %v", err)
@@ -248,7 +248,7 @@ func TestWithNamespace(t *testing.T) {
 			   if test.checkFunc == nil {
 			       test.checkFunc = defaultCheckFunc
 			   }
-			   got := WithNamespace(test.args.ns)
+			   got := WithName(test.args.name)
 			   obj := new(T)
 			   got(obj)
 			   if err := test.checkFunc(test.want, obj); err != nil {
@@ -259,12 +259,12 @@ func TestWithNamespace(t *testing.T) {
 	}
 }
 
-func TestWithDiscoverDuration(t *testing.T) {
+func TestWithNamespace(t *testing.T) {
 	t.Parallel()
 	// Change interface type to the type of object you are testing
 	type T = interface{}
 	type args struct {
-		dur string
+		ns string
 	}
 	type want struct {
 		obj *T
@@ -311,7 +311,7 @@ func TestWithDiscoverDuration(t *testing.T) {
 		   {
 		       name: "test_case_1",
 		       args: args {
-		           dur: "",
+		           ns: "",
 		       },
 		       want: want {
 		           obj: new(T),
@@ -325,7 +325,7 @@ func TestWithDiscoverDuration(t *testing.T) {
 		       return test {
 		           name: "test_case_2",
 		           args: args {
-		           dur: "",
+		           ns: "",
 		           },
 		           want: want {
 		               obj: new(T),
@@ -353,7 +353,7 @@ func TestWithDiscoverDuration(t *testing.T) {
 			       test.checkFunc = defaultCheckFunc
 			   }
 
-			   got := WithDiscoverDuration(test.args.dur)
+			   got := WithNamespace(test.args.ns)
 			   obj := new(T)
 			   if err := test.checkFunc(test.want, obj, got(obj)); err != nil {
 			       tt.Errorf("error = %v", err)
@@ -365,7 +365,7 @@ func TestWithDiscoverDuration(t *testing.T) {
 			   if test.checkFunc == nil {
 			       test.checkFunc = defaultCheckFunc
 			   }
-			   got := WithDiscoverDuration(test.args.dur)
+			   got := WithNamespace(test.args.ns)
 			   obj := new(T)
 			   got(obj)
 			   if err := test.checkFunc(test.want, obj); err != nil {
@@ -376,12 +376,12 @@ func TestWithDiscoverDuration(t *testing.T) {
 	}
 }
 
-func TestWithErrGroup(t *testing.T) {
+func TestWithDiscoverDuration(t *testing.T) {
 	t.Parallel()
 	// Change interface type to the type of object you are testing
 	type T = interface{}
 	type args struct {
-		eg errgroup.Group
+		dur string
 	}
 	type want struct {
 		obj *T
@@ -428,7 +428,7 @@ func TestWithErrGroup(t *testing.T) {
 		   {
 		       name: "test_case_1",
 		       args: args {
-		           eg: nil,
+		           dur: "",
 		       },
 		       want: want {
 		           obj: new(T),
@@ -442,7 +442,7 @@ func TestWithErrGroup(t *testing.T) {
 		       return test {
 		           name: "test_case_2",
 		           args: args {
-		           eg: nil,
+		           dur: "",
 		           },
 		           want: want {
 		               obj: new(T),
@@ -470,7 +470,7 @@ func TestWithErrGroup(t *testing.T) {
 			       test.checkFunc = defaultCheckFunc
 			   }
 
-			   got := WithErrGroup(test.args.eg)
+			   got := WithDiscoverDuration(test.args.dur)
 			   obj := new(T)
 			   if err := test.checkFunc(test.want, obj, got(obj)); err != nil {
 			       tt.Errorf("error = %v", err)
@@ -482,7 +482,7 @@ func TestWithErrGroup(t *testing.T) {
 			   if test.checkFunc == nil {
 			       test.checkFunc = defaultCheckFunc
 			   }
-			   got := WithErrGroup(test.args.eg)
+			   got := WithDiscoverDuration(test.args.dur)
 			   obj := new(T)
 			   got(obj)
 			   if err := test.checkFunc(test.want, obj); err != nil {
@@ -493,12 +493,12 @@ func TestWithErrGroup(t *testing.T) {
 	}
 }
 
-func TestWithDialer(t *testing.T) {
+func TestWithErrGroup(t *testing.T) {
 	t.Parallel()
 	// Change interface type to the type of object you are testing
 	type T = interface{}
 	type args struct {
-		der net.Dialer
+		eg errgroup.Group
 	}
 	type want struct {
 		obj *T
@@ -545,7 +545,7 @@ func TestWithDialer(t *testing.T) {
 		   {
 		       name: "test_case_1",
 		       args: args {
-		           der: nil,
+		           eg: nil,
 		       },
 		       want: want {
 		           obj: new(T),
@@ -559,7 +559,7 @@ func TestWithDialer(t *testing.T) {
 		       return test {
 		           name: "test_case_2",
 		           args: args {
-		           der: nil,
+		           eg: nil,
 		           },
 		           want: want {
 		               obj: new(T),
@@ -587,7 +587,7 @@ func TestWithDialer(t *testing.T) {
 			       test.checkFunc = defaultCheckFunc
 			   }
 
-			   got := WithDialer(test.args.der)
+			   got := WithErrGroup(test.args.eg)
 			   obj := new(T)
 			   if err := test.checkFunc(test.want, obj, got(obj)); err != nil {
 			       tt.Errorf("error = %v", err)
@@ -599,7 +599,7 @@ func TestWithDialer(t *testing.T) {
 			   if test.checkFunc == nil {
 			       test.checkFunc = defaultCheckFunc
 			   }
-			   got := WithDialer(test.args.der)
+			   got := WithErrGroup(test.args.eg)
 			   obj := new(T)
 			   got(obj)
 			   if err := test.checkFunc(test.want, obj); err != nil {
diff --git a/pkg/discoverer/k8s/usecase/discovered_test.go b/pkg/discoverer/k8s/usecase/discovered_test.go
index a5406f843a..f5520798c5 100644
--- a/pkg/discoverer/k8s/usecase/discovered_test.go
+++ b/pkg/discoverer/k8s/usecase/discovered_test.go
@@ -23,6 +23,7 @@ import (
 
 	"github.com/vdaas/vald/internal/errgroup"
 	"github.com/vdaas/vald/internal/errors"
+	"github.com/vdaas/vald/internal/net"
 	"github.com/vdaas/vald/internal/observability"
 	"github.com/vdaas/vald/internal/runner"
 	"github.com/vdaas/vald/internal/servers/starter"
@@ -121,6 +122,7 @@ func Test_run_PreStart(t *testing.T) {
 		h             handler.DiscovererServer
 		server        starter.Server
 		observability observability.Observability
+		der           net.Dialer
 	}
 	type want struct {
 		err error
@@ -155,6 +157,7 @@ func Test_run_PreStart(t *testing.T) {
 		           h: nil,
 		           server: nil,
 		           observability: nil,
+		           der: nil,
 		       },
 		       want: want{},
 		       checkFunc: defaultCheckFunc,
@@ -176,6 +179,7 @@ func Test_run_PreStart(t *testing.T) {
 		           h: nil,
 		           server: nil,
 		           observability: nil,
+		           der: nil,
 		           },
 		           want: want{},
 		           checkFunc: defaultCheckFunc,
@@ -205,6 +209,7 @@ func Test_run_PreStart(t *testing.T) {
 				h:             test.fields.h,
 				server:        test.fields.server,
 				observability: test.fields.observability,
+				der:           test.fields.der,
 			}
 
 			err := r.PreStart(test.args.ctx)
@@ -227,6 +232,7 @@ func Test_run_Start(t *testing.T) {
 		h             handler.DiscovererServer
 		server        starter.Server
 		observability observability.Observability
+		der           net.Dialer
 	}
 	type want struct {
 		want <-chan error
@@ -265,6 +271,7 @@ func Test_run_Start(t *testing.T) {
 		           h: nil,
 		           server: nil,
 		           observability: nil,
+		           der: nil,
 		       },
 		       want: want{},
 		       checkFunc: defaultCheckFunc,
@@ -286,6 +293,7 @@ func Test_run_Start(t *testing.T) {
 		           h: nil,
 		           server: nil,
 		           observability: nil,
+		           der: nil,
 		           },
 		           want: want{},
 		           checkFunc: defaultCheckFunc,
@@ -315,6 +323,7 @@ func Test_run_Start(t *testing.T) {
 				h:             test.fields.h,
 				server:        test.fields.server,
 				observability: test.fields.observability,
+				der:           test.fields.der,
 			}
 
 			got, err := r.Start(test.args.ctx)
@@ -337,6 +346,7 @@ func Test_run_PreStop(t *testing.T) {
 		h             handler.DiscovererServer
 		server        starter.Server
 		observability observability.Observability
+		der           net.Dialer
 	}
 	type want struct {
 		err error
@@ -371,6 +381,7 @@ func Test_run_PreStop(t *testing.T) {
 		           h: nil,
 		           server: nil,
 		           observability: nil,
+		           der: nil,
 		       },
 		       want: want{},
 		       checkFunc: defaultCheckFunc,
@@ -392,6 +403,7 @@ func Test_run_PreStop(t *testing.T) {
 		           h: nil,
 		           server: nil,
 		           observability: nil,
+		           der: nil,
 		           },
 		           want: want{},
 		           checkFunc: defaultCheckFunc,
@@ -421,6 +433,7 @@ func Test_run_PreStop(t *testing.T) {
 				h:             test.fields.h,
 				server:        test.fields.server,
 				observability: test.fields.observability,
+				der:           test.fields.der,
 			}
 
 			err := r.PreStop(test.args.ctx)
@@ -443,6 +456,7 @@ func Test_run_Stop(t *testing.T) {
 		h             handler.DiscovererServer
 		server        starter.Server
 		observability observability.Observability
+		der           net.Dialer
 	}
 	type want struct {
 		err error
@@ -477,6 +491,7 @@ func Test_run_Stop(t *testing.T) {
 		           h: nil,
 		           server: nil,
 		           observability: nil,
+		           der: nil,
 		       },
 		       want: want{},
 		       checkFunc: defaultCheckFunc,
@@ -498,6 +513,7 @@ func Test_run_Stop(t *testing.T) {
 		           h: nil,
 		           server: nil,
 		           observability: nil,
+		           der: nil,
 		           },
 		           want: want{},
 		           checkFunc: defaultCheckFunc,
@@ -527,6 +543,7 @@ func Test_run_Stop(t *testing.T) {
 				h:             test.fields.h,
 				server:        test.fields.server,
 				observability: test.fields.observability,
+				der:           test.fields.der,
 			}
 
 			err := r.Stop(test.args.ctx)
@@ -549,6 +566,7 @@ func Test_run_PostStop(t *testing.T) {
 		h             handler.DiscovererServer
 		server        starter.Server
 		observability observability.Observability
+		der           net.Dialer
 	}
 	type want struct {
 		err error
@@ -583,6 +601,7 @@ func Test_run_PostStop(t *testing.T) {
 		           h: nil,
 		           server: nil,
 		           observability: nil,
+		           der: nil,
 		       },
 		       want: want{},
 		       checkFunc: defaultCheckFunc,
@@ -604,6 +623,7 @@ func Test_run_PostStop(t *testing.T) {
 		           h: nil,
 		           server: nil,
 		           observability: nil,
+		           der: nil,
 		           },
 		           want: want{},
 		           checkFunc: defaultCheckFunc,
@@ -633,6 +653,7 @@ func Test_run_PostStop(t *testing.T) {
 				h:             test.fields.h,
 				server:        test.fields.server,
 				observability: test.fields.observability,
+				der:           test.fields.der,
 			}
 
 			err := r.PostStop(test.args.ctx)