diff --git a/conf/nebula-graphd.conf.default b/conf/nebula-graphd.conf.default
index 80c0d0976a7..919f94d7f5c 100644
--- a/conf/nebula-graphd.conf.default
+++ b/conf/nebula-graphd.conf.default
@@ -62,7 +62,7 @@
 # The number of networking IO threads, 0 for # of CPU cores
 --num_netio_threads=0
 # The number of threads to execute user queries, 0 for # of CPU cores
---num_worker_threads=1
+--num_worker_threads=0
 # HTTP service ip
 --ws_ip=0.0.0.0
 # HTTP service port
diff --git a/src/common/utils/NebulaKeyUtils.cpp b/src/common/utils/NebulaKeyUtils.cpp
index 6db2db93a13..479ad2c939c 100644
--- a/src/common/utils/NebulaKeyUtils.cpp
+++ b/src/common/utils/NebulaKeyUtils.cpp
@@ -45,7 +45,6 @@ std::string NebulaKeyUtils::tagKey(
       .append(vId.data(), vId.size())
       .append(vIdLen - vId.size(), pad)
       .append(reinterpret_cast<const char*>(&tagId), sizeof(TagID));
-  VLOG(1) << "tagKey return value: " << key;
   return key;
 }
 
@@ -71,7 +70,6 @@ std::string NebulaKeyUtils::edgeKey(size_t vIdLen,
       .append(dstId.data(), dstId.size())
       .append(vIdLen - dstId.size(), '\0')
       .append(1, ev);
-  VLOG(1) << "edgeKey return value: " << key;
   return key;
 }
 
diff --git a/src/graph/executor/query/TraverseExecutor.cpp b/src/graph/executor/query/TraverseExecutor.cpp
index be316a9d25a..a9cdde86939 100644
--- a/src/graph/executor/query/TraverseExecutor.cpp
+++ b/src/graph/executor/query/TraverseExecutor.cpp
@@ -242,15 +242,9 @@ Status TraverseExecutor::buildInterimPath(GetNeighborsIter* iter) {
       return Status::Error("Can't find prev paths.");
     }
     const auto& paths = pathToSrcFound->second;
-    // debug
-    VLOG(1) << "visited src:\t" << srcV.toString() << "\tedge:\t" << e.toString();
-    VLOG(1) << "prevPath size:\t" << paths.size();
     for (auto& prevPath : paths) {
       if (hasSameEdge(prevPath, e.getEdge())) {
-        VLOG(1) << "\t\tsame edge:\t" << prevPath.toString() << "\t\tto edge\t" << e.toString();
         continue;
-      } else {
-        VLOG(1) << "\t\tdiff edge:\t" << prevPath.toString() << "\t\tto edge\t" << e.toString();
       }
       vids_.emplace(dst);
 
@@ -263,7 +257,6 @@ Status TraverseExecutor::buildInterimPath(GetNeighborsIter* iter) {
         List neighbors;
         neighbors.values.emplace_back(e);
         path.values.emplace_back(std::move(neighbors));
-        VLOG(1) << "\t\t\tadded path:" << path.toString();
         buildPath(current, dst, std::move(path));
         ++count;
       } else {
@@ -271,7 +264,6 @@ Status TraverseExecutor::buildInterimPath(GetNeighborsIter* iter) {
         auto& eList = path.values.back().mutableList().values;
         eList.emplace_back(srcV);
         eList.emplace_back(e);
-        VLOG(1) << "\t\t\tadded path:" << path.toString();
         buildPath(current, dst, std::move(path));
         ++count;
       }
diff --git a/src/storage/exec/GetNeighborsNode.h b/src/storage/exec/GetNeighborsNode.h
index 1817a08d3dc..a6d9d877071 100644
--- a/src/storage/exec/GetNeighborsNode.h
+++ b/src/storage/exec/GetNeighborsNode.h
@@ -63,7 +63,6 @@ class GetNeighborsNode : public QueryNode<VertexID> {
     if (context_->isIntId()) {
       row.emplace_back(*reinterpret_cast<const int64_t*>(vId.data()));
     } else {
-      VLOG(1) << "vId to iterate: " << vId;
       row.emplace_back(vId);
     }
     // second column is reserved for stat
@@ -120,7 +119,6 @@ class GetNeighborsNode : public QueryNode<VertexID> {
       auto reader = upstream_->reader();
       auto props = context_->props_;
       auto columnIdx = context_->columnIdx_;
-      VLOG(1) << "Key to iterate: " << key.toString();
       list.reserve(props->size());
       // collect props need to return
       if (!QueryUtils::collectEdgeProps(
diff --git a/src/storage/exec/HashJoinNode.h b/src/storage/exec/HashJoinNode.h
index ff806a75f5d..1448c64d3fe 100644
--- a/src/storage/exec/HashJoinNode.h
+++ b/src/storage/exec/HashJoinNode.h
@@ -156,29 +156,24 @@ class HashJoinNode : public IterateNode<VertexID> {
   /* This section is implemented to filter out duplicated self-reflective edges. */
  private:
   bool isDuplicatedSelfReflectiveEdge(SingleEdgeNode* edgeNode) {
-    // get destination id
     if (!edgeNode->valid()) {
       return false;
     }
     auto rawKey = edgeNode->key();
     std::string srcID = NebulaKeyUtils::getSrcId(context_->vIdLen(), rawKey).str();
     std::string dstID = NebulaKeyUtils::getDstId(context_->vIdLen(), rawKey).str();
-    VLOG(1) << "Tried to detect SR Edge with: " << srcID << "\t" << dstID;
     if (srcID.compare(dstID) == 0) {
       // self-reflective edge
       std::string rank = std::to_string(NebulaKeyUtils::getRank(context_->vIdLen(), rawKey));
       auto edgeType = NebulaKeyUtils::getEdgeType(context_->vIdLen(), rawKey);
       edgeType = edgeType > 0 ? edgeType : -edgeType;
       std::string type = std::to_string(edgeType);
-      // std::string key = srcID + std::to_string(edgeType) + std::to_string(rank);
       std::string key;
       key.reserve(srcID.size() + type.size() + rank.size());
       key = type + rank + srcID;
       if (!visitedSelfReflectiveEdges_.insert(key).second) {
         return true;
       }
-      for (auto& elem : visitedSelfReflectiveEdges_) {
-      }
     }
     return false;
   }