scheduler corruption on high number of retries #1956

edsiper · 2020-02-14T23:18:51Z

originally reported on #1950 by @rmacian

2020/02/14 15:07:30] [debug] [storage] [cio file] alloc_size from 36864 to 102400
[2020/02/14 15:07:30] [debug] [storage] [cio file] synced at: tail.4/1-1581692850.200312113.flb
[2020/02/14 15:07:30] [debug] [in_tail] file=/var/log/containers/purchase-event-manager-5-vmmb9_gvp_purchase-event-manager-02060e929d3e460da6ac351689cd2f419d6ba192cced026a458110b095d93812.log read=32689 lines=71
[2020/02/14 15:07:30] [debug] [task] destroy task=0x7f14075faee0 (task_id=33)
[2020/02/14 15:07:30] [debug] [storage] tail.0:1-1581692755.636380503.flb mapped OK
[2020/02/14 15:07:30] [debug] [task] created task=0x7f14075faee0 id=33 OK
[2020/02/14 15:07:30] [debug] [out_forward] request 143790 bytes to flush
[2020/02/14 15:07:30] [debug] [out_fw] 154 entries tag='kube.var.log.containers.message-manager-north-5-f4cvk_tid_message-manager-north-4f3d19b958f53e2dc6e59555ba887569d0153f63a399ef1ba8d80b61f873e316.log' tag_len=148
[2020/02/14 15:07:30] [debug] [task] created task=0x7f140743ef40 id=126 OK
[2020/02/14 15:07:30] [debug] [out_forward] request 1239 bytes to flush
[2020/02/14 15:07:30] [debug] [out_fw] 1 entries tag='kube.var.log.containers.epg-agent-wait-2-46fc8_gvp_epg-agent-wait-e41122f15d432269e0156784949f781883d92669b0c5592300be5123a6060544.log' tag_len=134
[2020/02/14 15:07:30] [ warn] [task] retry for task 7 could not be re-scheduled
[2020/02/14 15:07:30] [debug] [retry] task retry=0x7f140740bae0, invalidated from the scheduler
[2020/02/14 15:07:30] [debug] [task] destroy task=0x7f14074400c0 (task_id=7)
[engine] caught signal (SIGSEGV)
#0  0x5653af67bebb      in  __mk_list_del() at lib/monkey/include/monkey/mk_core/mk_list.h:87
#1  0x5653af67bef2      in  mk_list_del() at lib/monkey/include/monkey/mk_core/mk_list.h:93
#2  0x5653af67c779      in  flb_sched_request_destroy() at src/flb_scheduler.c:314
#3  0x5653af67c8c7      in  flb_sched_event_handler() at src/flb_scheduler.c:375
#4  0x5653af67a17a      in  flb_engine_start() at src/flb_engine.c:548
#5  0x5653af5e8cc6      in  main() at src/fluent-bit.c:854
#6  0x7f14088b72e0      in  ???() at ???:0
#7  0x5653af5e71a9      in  ???() at ???:0
#8  0xffffffffffffffff  in  ???() at ???:0

The text was updated successfully, but these errors were encountered:

edsiper · 2020-02-14T23:19:58Z

@rmacian

Please provide a full copy of your configuration, so I can try to reproduce the problem.

rmacian · 2020-02-15T13:40:18Z

I am using ansible to deploy, that's why you will see some loop for defining an input for each namespace defined.

fluent-bit.conf: |
    [SERVICE]
        Flush         1
        Log_Level     ${FLB_LOG_LVL}
        Daemon        off
        Parsers_File  parsers.conf
        HTTP_Server   On
        HTTP_Listen   0.0.0.0
        HTTP_Port     2020
        Streams_File stream_processor.conf
        storage.path              /var/lib/fluentbit
        storage.sync              normal
        storage.checksum          off
        storage.backlog.mem_limit 8M
    @INCLUDE input-kubernetes.conf
    @INCLUDE filter-kubernetes.conf
    @INCLUDE output-stdout.conf
  input-kubernetes.conf: |
{% for namespace in namespaces %}
    [INPUT]
        Name              tail
        Tag               kube.*
        Path              /var/log/containers/*_{{namespace}}_*.log
        Parser            docker
        DB                /var/log/flb_kube_{{namespace}}.db
        Mem_Buf_Limit     8MB
        storage.type      filesystem
        Skip_Long_Lines   On
        Refresh_Interval  10
{% endfor %}
output-stdout.conf: |
    [OUTPUT]
        Name          forward
        Match         kube.*
        Upstream      upstream.conf
filter-kubernetes.conf: |
    [FILTER]
        Name                kubernetes
        Match               kube.*
        Kube_URL            https://kubernetes.default.svc:443
        Kube_CA_File        /var/run/secrets/kubernetes.io/serviceaccount/ca.crt
        Kube_Token_File     /var/run/secrets/kubernetes.io/serviceaccount/token
        Merge_Log           On
        Merge_Log_Key       log_processed
        K8S-Logging.Parser  On
        K8S-Logging.Exclude On
parsers.conf: |
    [PARSER]
        Name        docker
        Format      json
        Time_Key    time
        Time_Format %Y-%m-%dT%H:%M:%S.%L
        Time_Keep   On
        # Command      |  Decoder | Field | Optional Action
        # =============|==================|=================
        # Decode_Field_As   escaped    log

I noticed that the cpu on the node that crashed fired up to the limit established in kubernetes of 800 milicores while the other 3 pods were around 20mc. I checked the fluentd from openshift on the same node and was only taking 60mc. The difference is that my fluentbit uses the tail input and I see that fluentd on openshift uses the fluent-plugin-systemd.

It's more efficient to get the logs directly from the journal system instead of the filesystem? I cannot see how to get the pod's output in any unit in systemctl.

edsiper · 2020-02-15T14:20:35Z

what about if you try Fluent Bit systemd input plugin ?

rmacian · 2020-02-17T10:27:34Z

I can't find where the logs from my containers are in openshift within systemd.

I thought perhaps the error was because the /var/lib was not properly mounted but the crash has happened again

[2020/02/17 15:55:35] [debug] [out_forward] request 97351 bytes to flush
[2020/02/17 15:55:35] [debug] [out_fw] 80 entries tag='kube.var.log.containers.alexa-2-f7jng_gvc_alexa-a5eda341f781e92acd64a3f6b5004b7e5c754d7e937f9c3e924fbe427dc08c16.log' tag_len=116
[2020/02/17 15:55:35] [ warn] [task] retry for task 14 could not be re-scheduled
[2020/02/17 15:55:35] [debug] [retry] task retry=0x7faf04e0bc20, invalidated from the scheduler
[2020/02/17 15:55:35] [debug] [task] destroy task=0x7faf03deba00 (task_id=14)
[engine] caught signal (SIGSEGV)
#0  0x557f455bfebb      in  __mk_list_del() at lib/monkey/include/monkey/mk_core/mk_list.h:87
#1  0x557f455bfef2      in  mk_list_del() at lib/monkey/include/monkey/mk_core/mk_list.h:93
#2  0x557f455c0779      in  flb_sched_request_destroy() at src/flb_scheduler.c:314
#3  0x557f455c08c7      in  flb_sched_event_handler() at src/flb_scheduler.c:375
#4  0x557f455be17a      in  flb_engine_start() at src/flb_engine.c:548
#5  0x557f4552ccc6      in  main() at src/fluent-bit.c:854
#6  0x7faf063772e0      in  ???() at ???:0
#7  0x557f4552b1a9      in  ???() at ???:0
#8  0xffffffffffffffff  in  ???() at ???:0

Now is 11:27 AM

I also see:

du -hs *
160M    tail.0
0       tail.1
0       tail.2
478M    tail.3
3.1G    tail.4
0       tail.5

It looks like a performance issue, I cannot send as fast as I read

rmacian · 2020-02-19T09:31:37Z

things are getting worse.

root@vepboanvllbo002:/var/lib/fluentbit # du -hs *
668M tail.0
0 tail.1
0 tail.2
503M tail.3
5.7G tail.4
0 tail.5

and I am also seeing errors like:

[2020/02/19 05:46:38] [error] [out_fw] error writing content body
[2020/02/19 07:57:24] [debug] [out_forward] request 3899746 bytes to flush
[2020/02/19 07:57:24] [debug] [out_fw] 4545 entries tag='kube.var.log.containers.gal-connector-29-zsm8g_tit_gal-connector-de8c4177657b67334b677421d9b34b45bbe41eeff126130212359d4e2b564760.log' tag_len=133
[2020/02/19 08:18:43] [debug] [out_forward] request 3973685 bytes to flush
[2020/02/19 08:18:43] [debug] [out_fw] 4661 entries tag='kube.var.log.containers.gal-connector-29-zsm8g_tid_gal-connector-de8c4177657b67334b677421d9b34b45bbe41eeff126130212359d4e2b564760.log' tag_len=133
[2020/02/19 09:12:40] [debug] [out_forward] request 3976173 bytes to flush
[2020/02/19 09:12:40] [debug] [out_fw] 4665 entries tag='kube.var.log.containers.gal-connector-29-zsm8g_tid_gal-connector-de8c4177657b67334b677421d9b34b45bbe41eeff126130212359d4e2b564760.log' tag_len=133
[2020/02/19 09:14:00] [error] [out_fw] error writing content body
[2020/02/19 09:14:00] [error] [out_fw] error writing content body
[2020/02/19 09:15:00] [debug] [out_forward] request 3986994 bytes to flush

I set the image to 1.3.7-debug and put the loglevel at trace and crashes:

[2020/02/19 10:14:43] [debug] [storage] [cio stream] new stream registered: tail.1
[2020/02/19 10:14:43] [debug] [storage] [cio scan] opening stream tail.1
[2020/02/19 10:14:43] [debug] [storage] [cio stream] new stream registered: tail.2
[2020/02/19 10:14:43] [debug] [storage] [cio scan] opening stream tail.2
[2020/02/19 10:14:43] [debug] [storage] [cio stream] new stream registered: tail.3
[2020/02/19 10:14:43] [debug] [storage] [cio scan] opening stream tail.3
[2020/02/19 10:14:43] [debug] [storage] [cio stream] new stream registered: tail.4
[2020/02/19 10:14:43] [debug] [storage] [cio scan] opening stream tail.4

[engine] caught signal (SIGTERM)
[engine] caught signal (SIGSEGV)
[2020/02/19 10:15:08] [ info] [input] pausing tail.0
#0 0x56324dd96b59 in in_tail_pause() at plugins/in_tail/tail.c:329
#1 0x56324dd6627a in flb_input_pause_all() at src/flb_input.c:696
#2 0x56324dd6f653 in flb_engine_exit() at src/flb_engine.c:628
#3 0x56324dcdce0d in flb_signal_handler() at src/fluent-bit.c:242
#4 0x7f30a0ff405f in ???() at ???:0
#5 0x56324dfd2108 in cio_file_is_up() at lib/chunkio/src/cio_file.c:1063
#6 0x56324dfd0cfd in open_and_up() at lib/chunkio/src/cio_file.c:431
#7 0x56324dfd0f8f in cio_file_open() at lib/chunkio/src/cio_file.c:509
#8 0x56324dfceba8 in cio_chunk_open() at lib/chunkio/src/cio_chunk.c:76
#9 0x56324dfd296c in cio_scan_stream_files() at lib/chunkio/src/cio_scan.c:77
#10 0x56324dfd2a99 in cio_scan_streams() at lib/chunkio/src/cio_scan.c:115
#11 0x56324dfcfee2 in cio_load() at lib/chunkio/src/chunkio.c:113
#12 0x56324dd72c38 in flb_storage_create() at src/flb_storage.c:240
#13 0x56324dd6edca in flb_engine_start() at src/flb_engine.c:405
#14 0x56324dcddfa6 in main() at src/fluent-bit.c:854
#15 0x7f30a0fe12e0 in ???() at ???:0
#16 0x56324dcdc489 in ???() at ???:0
#17 0xffffffffffffffff in ???() at ???:0

edsiper · 2020-02-19T13:29:29Z

there are two errors:

your Fluent Bit is getting network issues when writing the content to the output destination, you can see that in the error message "[out_fw] error writing content body", so since that's failing your file system queue is getting filed quickly, which is expected. You have to troubleshoot why the remote end-point is dropping the connection or if you have a balancer check what's going on.
The second problem is clearly a bug in Fluent Bit only highlighted under the conditions of the problem in 1 above. I am investigating in the code to see how it can be fixed.

rmacian · 2020-02-19T17:15:12Z

The last week to had to open an issue with RedHat because the fluentd queues in openshift were stopped by this error: "invalid byte sequence in UTF-8" not sending logs to elasticsearch at all. We have some app which causes this error and We have to add the ENABLE_UTF8_FILTER in fluentd:

https://bugzilla.redhat.com/show_bug.cgi?id=1562004

Maybe this be affecting fluent-bit too ?

edsiper · 2020-02-20T04:22:01Z

@rmacian

Fluent Bit v1.3.8 has been officially released, please upgrade and send us some feedback:

https://fluentbit.io/announcements/v1.3.8/

Docker image: fluent/fluent-bit:1.3.8

rmacian · 2020-02-20T08:51:06Z

I was on 1.3.8-next 1 in one of the pods yesterday.

This morning the last log was from an hour ago. I saw lots of

[2020/02/20 06:53:50] [error] [out_fw] error writing content body
[2020/02/20 07:15:22] [trace] [out_fw] ended write()=81743 bytes
[2020/02/20 07:15:22] [error] [out_fw] error writing content body

and finally a

[2020/02/20 07:15:22] [error] [out_fw] no upstream connections available

before upgrading to 1.3.8 I checked that the upstreams were available so it looks like it was not trying to reconnect.

After upgrading to 1.3.8 it started to send logs and after a while stopped again, some error writing content body and finally I stopped it when I got

/var/lib/fluentbit # du -hs *
46M     tail.0
0       tail.1
0       tail.2
163M    tail.3
1002M   tail.4
0       tail.5

After a restart it looks like it's checking something (does not crash as before) but after 30 minutes the pod is still not ready and those are the last lines I see:

424f167a4e38c93e3b7c36.log promote to TAIL_EVENT
[2020/02/20 08:23:29] [debug] [storage] tail.3:1-1582187009.235291050.flb mapped OK
[2020/02/20 08:23:29] [debug] [filter_kube] API Server (ns=orquestador-dev, pod=p3x-redis-ui-15-q9fpz) http_do=0, HTTP Status: 200
[2020/02/20 08:23:29] [debug] [in_tail] file=/var/log/containers/p3x-redis-ui-15-q9fpz_orquestador-dev_p3x-redis-ui-97c079ac843e403012e1a251884ef73f8921b71e7488d33d0e5532f98956b630.log read=174 lines=1
[2020/02/20 08:23:29] [debug] [storage] tail.3:1-1582187009.249927116.flb mapped OK
[2020/02/20 08:23:29] [debug] [filter_kube] API Server (ns=orquestador-dev, pod=redis-probe-test-34-f8qz7) http_do=0, HTTP Status: 200
[2020/02/20 08:23:29] [debug] [in_tail] file=/var/log/containers/redis-probe-test-34-f8qz7_orquestador-dev_redis-probe-test-79b1b04b0e7e5c223cf13a04ba3e1c3665540b3a85486b3b9ce85162cc7a3142.log read=3976 lines=26
[2020/02/20 08:23:29] [debug] [storage] tail.4:1-1582187009.265055451.flb mapped OK
[2020/02/20 08:23:29] [debug] [in_tail] file=/var/log/containers/redis-probe-test-34-f8qz7_orquestador-dev_redis-probe-test-79b1b04b0e7e5c223cf13a04ba3e1c3665540b3a85486b3b9ce85162cc7a3142.log read=3976 lines=26

The next line was written after 32 minutes:

[2020/02/20 08:55:48] [debug] [filter_kube] API Server (ns=gvp, pod=athena-29-hwxg2) http_do=0, HTTP Status: 200

and now is sending some logs.. what has been doing during this 32 minutes?

edsiper · 2020-02-20T15:34:34Z

32 minutes is a lot of time, but I am seeing you are facing network issues. While writing data the socket gets disconnected from the remote end-point.

Would you please try the new keepalive option in your forward output section, e.g:

    [OUTPUT]
        Name          forward
        Match         kube.*
        Host           abc
        Port            abc
        Keepalive   on

note I've removed your Upstream entry.

rmacian · 2020-02-20T15:58:41Z

I've enabled the keepalive and restarted everything. What I see is the more files you have on disk the more delays the init of the containers. Note this

/var/lib/fluentbit # du -hs *
12M     tail.0
0       tail.1
0       tail.2
24M     tail.3
38M     tail.4
0       tail.5

a delay of 30 secs after reading the storage and beginning processing logs:

[2020/02/20 15:42:17] [debug] [storage] tail.4:1-1582213337.803295972.flb mapped OK
[2020/02/20 15:42:47] [debug] [filter_kube] API Server (ns=gvp, pod=athena-29-7j642) http_do=0, HTTP Status: 200

and the first flush 1 second after

[2020/02/20 15:42:48] [debug] [out_forward] request 30634 bytes to flush

Now check this other pod:

# du -hs *
184M    tail.0
0       tail.1
0       tail.2
29M     tail.3
57M     tail.4
0       tail.5

22 minutes of delay between reading the storage and process the first log

[2020/02/20 15:42:22] [debug] [storage] tail.4:1-1582213342.431496854.flb mapped OK
[2020/02/20 15:54:29] [debug] [filter_kube] API Server (ns=gvp, pod=athena-29-hwxg2) http_do=0, HTTP Status: 200

but when begins to process add more files so more waiting and any flush going on , because of ?

[2020/02/20 15:42:22] [debug] [in_tail] file=/var/log/containers/go-bff-43-2w2fn_orquestador-dev_go-bff-2091678d1facaa3940219daf4981144372b33d109e5a7d0f28ac45a61e7f3b36.log read=32767 lines=6
[2020/02/20 15:42:22] [debug] [in_tail] file=/var/log/containers/orquestador-redis-3-z4gl7_orquestador-dev_redis-f593666cdde7704cce7c1a62ffb78c36f30bba12a7424f167a4e38c93e3b7c36.log promote to TAIL_EVENT
[2020/02/20 15:42:22] [debug] [in_tail] file=/var/log/containers/p3x-redis-ui-15-q9fpz_orquestador-dev_p3x-redis-ui-97c079ac843e403012e1a251884ef73f8921b71e7488d33d0e5532f98956b630.log promote to TAIL_EVENT
[2020/02/20 15:42:22] [debug] [storage] tail.3:1-1582213342.415953266.flb mapped OK
[2020/02/20 15:42:22] [debug] [filter_kube] API Server (ns=orquestador-dev, pod=redis-probe-test-34-f8qz7) http_do=0, HTTP Status: 200
[2020/02/20 15:42:22] [debug] [in_tail] file=/var/log/containers/redis-probe-test-34-f8qz7_orquestador-dev_redis-probe-test-79b1b04b0e7e5c223cf13a04ba3e1c3665540b3a85486b3b9ce85162cc7a3142.log read=610 lines=4
[2020/02/20 15:42:22] [debug] [storage] tail.4:1-1582213342.431496854.flb mapped OK
[2020/02/20 15:54:29] [debug] [filter_kube] API Server (ns=gvp, pod=athena-29-hwxg2) http_do=0, HTTP Status: 200
[2020/02/20 15:54:29] [debug] [in_tail] file=/var/log/containers/athena-29-hwxg2_gvp_athena-0c0de3a7282bed3254deb1fcff5efc06312a6f3688fc362161a8339340b06260.log read=32767 lines=45
[2020/02/20 15:54:29] [debug] [storage] tail.4:1-1582214069.651781785.flb mapped OK
[2020/02/20 15:54:29] [debug] [filter_kube] API Server (ns=gvp, pod=epg-agent-default-30-s54fc) http_do=0, HTTP Status: 200
[2020/02/20 15:54:29] [debug] [in_tail] file=/var/log/containers/epg-agent-default-30-s54fc_gvp_epg-agent-default-14258f4ab67bd71f223b10751f872d599d58cc7ed033f25136aa3d617c69b060.log read=14831 lines=56
[2020/02/20 15:54:29] [debug] [in_tail] file=/var/log/containers/epg-agent-default-30-s54fc_gvp_epg-agent-default-cb071ed5468d2a4403217e498f7b2b4f6e51410e600c1742ebd62f2dcc118222.log promote to TAIL_EVENT
[2020/02/20 15:54:29] [debug] [storage] tail.4:1-1582214069.668116248.flb mapped OK
[2020/02/20 15:54:29] [debug] [filter_kube] API Server (ns=gvp, pod=epg-agent-import-15-cngjk) http_do=0, HTTP Status: 200
[2020/02/20 15:54:29] [debug] [in_tail] file=/var/log/containers/epg-agent-import-15-cngjk_gvp_epg-agent-import-3468bc0dfe5fd05653b193a3341cfe2c56cd77516de15e09f804bc3519307251.log read=14298 lines=54
[2020/02/20 15:54:29] [debug] [in_tail] file=/var/log/containers/epg-agent-import-15-cngjk_gvp_epg-agent-import-42383eada102aa7d5fe56ca3c6c92f1654a4ada5f2bc6067049067d80d111c4c.log promote to TAIL_EVENT
[2020/02/20 15:54:29] [debug] [storage] tail.4:1-1582214069.683940243.flb mapped OK

Now is stucked here

I have got the config of the td-agent listening on the other side:

<buffer>
@type memory
flush_thread_count 16
flush_mode interval
flush_interval 1s
#chunk_limit_size 64MB
chunk_limit_records 10000
</buffer>

edsiper · 2020-02-20T16:05:52Z

what's the average memory usage of Fluent Bit Pod ?

rmacian · 2020-02-20T16:06:57Z

oc adm top pods
NAME                   CPU(cores)   MEMORY(bytes)
fluent-bit-c9wt2       1m           2Mi
fluent-bit-mb252       919m         25Mi
fluent-bit-s6lvr       0m           3Mi
fluent-bit-zn9hw       985m         4Mi
td-agent-bit-6-qzg9m   0m           10Mi

rmacian · 2020-02-24T08:33:40Z

No crashes once network issues are fixed but still getting pauses of 1 hour and high cpu usage

edsiper · 2020-02-24T21:01:39Z

I had a Zoom meeting with Raul, this is no longer an issue. Fixed after upgrade to v1.3.8.

edsiper self-assigned this Feb 14, 2020

edsiper added the troubleshooting label Feb 14, 2020

edsiper mentioned this issue Feb 14, 2020

[storage layer] Fluent-bit crashes on high contention if corrupted chunks exists #1950

Closed

edsiper added the waiting-for-user Waiting for more information, tests or requested changes label Feb 14, 2020

edsiper removed the waiting-for-user Waiting for more information, tests or requested changes label Feb 19, 2020

edsiper added the waiting-for-user Waiting for more information, tests or requested changes label Feb 20, 2020

edsiper added bug fixed and removed troubleshooting waiting-for-user Waiting for more information, tests or requested changes labels Feb 24, 2020

edsiper closed this as completed Feb 24, 2020

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scheduler corruption on high number of retries #1956

scheduler corruption on high number of retries #1956

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scheduler corruption on high number of retries #1956

scheduler corruption on high number of retries #1956

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