diff --git a/src/clients/storage/InternalStorageClient.cpp b/src/clients/storage/InternalStorageClient.cpp
index ce1f4be8b1c..f7e9457bfe7 100644
--- a/src/clients/storage/InternalStorageClient.cpp
+++ b/src/clients/storage/InternalStorageClient.cpp
@@ -10,6 +10,8 @@
 namespace nebula {
 namespace storage {
 
+constexpr int32_t kInternalPortOffset = -2;
+
 template <typename T>
 ::nebula::cpp2::ErrorCode getErrorCode(T& tryResp) {
   if (!tryResp.hasValue()) {
diff --git a/src/clients/storage/StorageClientBase-inl.h b/src/clients/storage/StorageClientBase-inl.h
index c9b530595a5..0cb5b32d377 100644
--- a/src/clients/storage/StorageClientBase-inl.h
+++ b/src/clients/storage/StorageClientBase-inl.h
@@ -106,20 +106,20 @@ StorageClientBase<ClientType, ClientManagerType>::collectResponse(
         memory::MemoryCheckGuard guard;
         StorageRpcResponse<Response> rpcResp(resps.size());
         for (size_t i = 0; i < resps.size(); i++) {
-          auto& host = hosts->at(i);
+          const auto& host = hosts->at(i);
           folly::Try<StatusOr<Response>>& tryResp = resps[i];
           if (tryResp.hasException()) {
             std::string errMsg = tryResp.exception().what().toStdString();
             rpcResp.markFailure();
             LOG(ERROR) << "There some RPC errors: " << errMsg;
-            auto req = requests.at(host);
-            auto parts = getReqPartsId(req);
+            const auto& req = requests.at(host);
+            const auto& parts = getReqPartsId(req);
             rpcResp.appendFailedParts(parts, nebula::cpp2::ErrorCode::E_RPC_FAILURE);
           } else {
             StatusOr<Response> status = std::move(tryResp).value();
             if (status.ok()) {
               auto resp = std::move(status).value();
-              auto result = resp.get_result();
+              const auto& result = resp.get_result();
 
               if (!result.get_failed_parts().empty()) {
                 rpcResp.markFailure();
@@ -141,8 +141,8 @@ StorageClientBase<ClientType, ClientManagerType>::collectResponse(
                       ? nebula::cpp2::ErrorCode::E_GRAPH_MEMORY_EXCEEDED
                       : nebula::cpp2::ErrorCode::E_RPC_FAILURE;
               LOG(ERROR) << "There some RPC errors: " << s.message();
-              auto req = requests.at(host);
-              auto parts = getReqPartsId(req);
+              const auto& req = requests.at(host);
+              const auto& parts = getReqPartsId(req);
               rpcResp.appendFailedParts(parts, errorCode);
             }
           }
diff --git a/src/clients/storage/StorageClientBase.h b/src/clients/storage/StorageClientBase.h
index b120dec009e..4be52412e61 100644
--- a/src/clients/storage/StorageClientBase.h
+++ b/src/clients/storage/StorageClientBase.h
@@ -20,8 +20,6 @@
 DECLARE_int32(storage_client_timeout_ms);
 DECLARE_uint32(storage_client_retry_interval_ms);
 
-constexpr int32_t kInternalPortOffset = -2;
-
 namespace nebula {
 namespace storage {
 
@@ -34,21 +32,18 @@ class StorageRpcResponse final {
   };
 
   explicit StorageRpcResponse(size_t reqsSent) : totalReqsSent_(reqsSent) {
-    lock_ = std::make_unique<std::mutex>();
+    responses_.reserve(reqsSent);
   }
 
   bool succeeded() const {
-    std::lock_guard<std::mutex> g(*lock_);
     return result_ == Result::ALL_SUCCEEDED;
   }
 
   int32_t maxLatency() const {
-    std::lock_guard<std::mutex> g(*lock_);
     return maxLatency_;
   }
 
-  void setLatency(HostAddr host, int32_t latency, int32_t e2eLatency) {
-    std::lock_guard<std::mutex> g(*lock_);
+  void setLatency(const HostAddr& host, int32_t latency, int32_t e2eLatency) {
     if (latency > maxLatency_) {
       maxLatency_ = latency;
     }
@@ -56,26 +51,22 @@ class StorageRpcResponse final {
   }
 
   void markFailure() {
-    std::lock_guard<std::mutex> g(*lock_);
     result_ = Result::PARTIAL_SUCCEEDED;
     ++failedReqs_;
   }
 
   // A value between [0, 100], representing a percentage
   int32_t completeness() const {
-    std::lock_guard<std::mutex> g(*lock_);
     DCHECK_NE(totalReqsSent_, 0);
     return totalReqsSent_ == 0 ? 0 : (totalReqsSent_ - failedReqs_) * 100 / totalReqsSent_;
   }
 
   void emplaceFailedPart(PartitionID partId, nebula::cpp2::ErrorCode errorCode) {
-    std::lock_guard<std::mutex> g(*lock_);
     failedParts_.emplace(partId, errorCode);
   }
 
   void appendFailedParts(const std::vector<PartitionID>& partsId,
                          nebula::cpp2::ErrorCode errorCode) {
-    std::lock_guard<std::mutex> g(*lock_);
     failedParts_.reserve(failedParts_.size() + partsId.size());
     for (const auto& partId : partsId) {
       failedParts_.emplace(partId, errorCode);
@@ -83,32 +74,26 @@ class StorageRpcResponse final {
   }
 
   void addResponse(Response&& resp) {
-    std::lock_guard<std::mutex> g(*lock_);
     responses_.emplace_back(std::move(resp));
   }
 
-  // Not thread-safe.
   const std::unordered_map<PartitionID, nebula::cpp2::ErrorCode>& failedParts() const {
     return failedParts_;
   }
 
-  // Not thread-safe.
   std::vector<Response>& responses() {
     return responses_;
   }
 
-  // Not thread-safe.
   const std::vector<Response>& responses() const {
     return responses_;
   }
 
-  // Not thread-safe.
   const std::vector<std::tuple<HostAddr, int32_t, int32_t>>& hostLatency() const {
     return hostLatency_;
   }
 
  private:
-  std::unique_ptr<std::mutex> lock_;
   const size_t totalReqsSent_;
   size_t failedReqs_{0};
 
diff --git a/src/graph/context/iterator/PropIter.cpp b/src/graph/context/iterator/PropIter.cpp
index 5daa5807ee4..286cc1fe1bd 100644
--- a/src/graph/context/iterator/PropIter.cpp
+++ b/src/graph/context/iterator/PropIter.cpp
@@ -93,16 +93,13 @@ const Value& PropIter::getProp(const std::string& name, const std::string& prop)
   if (name == "*") {
     for (auto& index : propsMap) {
       auto propIndex = index.second.find(prop);
-      if (propIndex == index.second.end()) {
-        continue;
-      }
-      colId = propIndex->second;
-      DCHECK_GT(row.size(), colId);
-      auto& val = row[colId];
-      if (val.empty()) {
-        continue;
-      } else {
-        return val;
+      if (propIndex != index.second.end()) {
+        colId = propIndex->second;
+        DCHECK_GT(row.size(), colId);
+        auto& val = row[colId];
+        if (!val.empty()) {
+          return val;
+        }
       }
     }
     return Value::kNullValue;
@@ -153,9 +150,7 @@ Value PropIter::getVertex(const std::string& name) {
     Tag tag;
     tag.name = tagProp.first;
     for (auto& propIndex : tagProp.second) {
-      if (propIndex.first == nebula::kTag) {  // "_tag"
-        continue;
-      } else {
+      if (propIndex.first != nebula::kTag) {  // "_tag"
         tag.props.emplace(propIndex.first, row[propIndex.second]);
       }
     }
diff --git a/src/graph/executor/Executor.h b/src/graph/executor/Executor.h
index ba9f90970cd..d4e27a8ad69 100644
--- a/src/graph/executor/Executor.h
+++ b/src/graph/executor/Executor.h
@@ -123,6 +123,13 @@ class Executor : private boost::noncopyable, private cpp::NonMovable {
       class GatherFunc>
   auto runMultiJobs(ScatterFunc &&scatter, GatherFunc &&gather, Iterator *iter);
 
+  void addState(const std::string &name, size_t durationInUs) {
+    otherStats_.emplace(name, folly::sformat("{}(us)", durationInUs));
+  }
+  void addState(const std::string &name, folly::dynamic json) {
+    otherStats_.emplace(name, folly::toPrettyJson(json));
+  }
+
   int64_t id_;
 
   // Executor name
diff --git a/src/graph/executor/StorageAccessExecutor.h b/src/graph/executor/StorageAccessExecutor.h
index a3881325f7c..c8c974435c6 100644
--- a/src/graph/executor/StorageAccessExecutor.h
+++ b/src/graph/executor/StorageAccessExecutor.h
@@ -148,12 +148,11 @@ class StorageAccessExecutor : public Executor {
   }
 
   template <typename RESP>
-  void addStats(storage::StorageRpcResponse<RESP> &resp,
-                std::unordered_map<std::string, std::string> &stats) const {
+  void addStats(storage::StorageRpcResponse<RESP> &resp) {
     auto &hostLatency = resp.hostLatency();
     for (size_t i = 0; i < hostLatency.size(); ++i) {
       auto info = util::collectRespProfileData(resp.responses()[i].get_result(), hostLatency[i]);
-      stats.emplace(folly::sformat("resp[{}]", i), folly::toPrettyJson(info));
+      addState(folly::sformat("resp[{}]", i), std::move(info));
     }
   }
 
diff --git a/src/graph/executor/query/AppendVerticesExecutor.cpp b/src/graph/executor/query/AppendVerticesExecutor.cpp
index ae420b28ad4..73dfb3e074a 100644
--- a/src/graph/executor/query/AppendVerticesExecutor.cpp
+++ b/src/graph/executor/query/AppendVerticesExecutor.cpp
@@ -9,9 +9,12 @@
 using nebula::storage::StorageClient;
 using nebula::storage::StorageRpcResponse;
 using nebula::storage::cpp2::GetPropResponse;
+
 DECLARE_bool(optimize_appendvertices);
+
 namespace nebula {
 namespace graph {
+
 folly::Future<Status> AppendVerticesExecutor::execute() {
   return appendVertices();
 }
@@ -56,15 +59,12 @@ folly::Future<Status> AppendVerticesExecutor::appendVertices() {
                  av->limit(qctx()),
                  av->filter())
       .via(runner())
-      .ensure([this, getPropsTime]() {
-        SCOPED_TIMER(&execTime_);
-        otherStats_.emplace("total_rpc", folly::sformat("{}(us)", getPropsTime.elapsedInUSec()));
-      })
-      .thenValue([this](StorageRpcResponse<GetPropResponse> &&rpcResp) {
+      .thenValue([this, getPropsTime](StorageRpcResponse<GetPropResponse> &&rpcResp) {
         // MemoryTrackerVerified
         memory::MemoryCheckGuard guard;
         SCOPED_TIMER(&execTime_);
-        addStats(rpcResp, otherStats_);
+        addState("total_rpc", getPropsTime.elapsedInUSec());
+        addStats(rpcResp);
         if (FLAGS_max_job_size <= 1) {
           return folly::makeFuture<Status>(handleResp(std::move(rpcResp)));
         } else {
@@ -150,12 +150,11 @@ Status AppendVerticesExecutor::handleResp(
   bool mv = movable(av->inputVars().front());
   for (; inputIter->valid(); inputIter->next()) {
     auto dstFound = map.find(src->eval(ctx(inputIter.get())));
-    if (dstFound == map.end()) {
-      continue;
+    if (dstFound != map.end()) {
+      Row row = mv ? inputIter->moveRow() : *inputIter->row();
+      row.values.emplace_back(dstFound->second);
+      ds.rows.emplace_back(std::move(row));
     }
-    Row row = mv ? inputIter->moveRow() : *inputIter->row();
-    row.values.emplace_back(dstFound->second);
-    ds.rows.emplace_back(std::move(row));
   }
   return finish(ResultBuilder().value(Value(std::move(ds))).state(state).build());
 }
@@ -175,9 +174,7 @@ folly::Future<Status> AppendVerticesExecutor::handleRespMultiJobs(
     if (resp.props_ref().has_value()) {
       auto &&respV = std::move(*resp.props_ref());
       v.colNames = respV.colNames;
-      v.rows.insert(v.rows.end(),
-                    std::make_move_iterator(respV.begin()),
-                    std::make_move_iterator(respV.end()));
+      std::move(respV.begin(), respV.end(), std::back_inserter(v.rows));
     }
   }
   auto propIter = PropIter(std::make_shared<Value>(std::move(v)));
@@ -191,10 +188,9 @@ folly::Future<Status> AppendVerticesExecutor::handleRespMultiJobs(
     auto gather = [this](auto &&results) -> Status {
       memory::MemoryCheckGuard guard;
       for (auto &r : results) {
+        NG_RETURN_IF_ERROR(r);
         auto &&rows = std::move(r).value();
-        result_.rows.insert(result_.rows.end(),
-                            std::make_move_iterator(rows.begin()),
-                            std::make_move_iterator(rows.end()));
+        std::move(rows.begin(), rows.end(), std::back_inserter(result_.rows));
       }
       return finish(ResultBuilder().value(Value(std::move(result_))).build());
     };
@@ -219,10 +215,9 @@ folly::Future<Status> AppendVerticesExecutor::handleRespMultiJobs(
       auto gatherFinal = [this](auto &&results) -> Status {
         memory::MemoryCheckGuard guard2;
         for (auto &r : results) {
+          NG_RETURN_IF_ERROR(r);
           auto &&rows = std::move(r).value();
-          result_.rows.insert(result_.rows.end(),
-                              std::make_move_iterator(rows.begin()),
-                              std::make_move_iterator(rows.end()));
+          std::move(rows.begin(), rows.end(), std::back_inserter(result_.rows));
         }
         return finish(ResultBuilder().value(Value(std::move(result_))).build());
       };
@@ -280,12 +275,11 @@ DataSet AppendVerticesExecutor::handleJob(size_t begin, size_t end, Iterator *it
   QueryExpressionContext ctx(qctx()->ectx());
   for (; iter->valid() && begin++ < end; iter->next()) {
     auto dstFound = dsts_.find(src->eval(ctx(iter)));
-    if (dstFound == dsts_.end()) {
-      continue;
+    if (dstFound != dsts_.end()) {
+      Row row = *iter->row();
+      row.values.emplace_back(dstFound->second);
+      ds.rows.emplace_back(std::move(row));
     }
-    Row row = *iter->row();
-    row.values.emplace_back(dstFound->second);
-    ds.rows.emplace_back(std::move(row));
   }
 
   return ds;
diff --git a/src/graph/executor/query/GetEdgesExecutor.cpp b/src/graph/executor/query/GetEdgesExecutor.cpp
index eade60d9e2b..f7fd043a2b5 100644
--- a/src/graph/executor/query/GetEdgesExecutor.cpp
+++ b/src/graph/executor/query/GetEdgesExecutor.cpp
@@ -103,7 +103,7 @@ folly::Future<Status> GetEdgesExecutor::getEdges() {
       .thenValue([this, ge](StorageRpcResponse<GetPropResponse> &&rpcResp) {
         memory::MemoryCheckGuard guard;
         SCOPED_TIMER(&execTime_);
-        addStats(rpcResp, otherStats_);
+        addStats(rpcResp);
         return handleResp(std::move(rpcResp), ge->colNames());
       });
 }
diff --git a/src/graph/executor/query/GetVerticesExecutor.cpp b/src/graph/executor/query/GetVerticesExecutor.cpp
index 0d250044d9a..27f16de84ea 100644
--- a/src/graph/executor/query/GetVerticesExecutor.cpp
+++ b/src/graph/executor/query/GetVerticesExecutor.cpp
@@ -53,7 +53,7 @@ folly::Future<Status> GetVerticesExecutor::getVertices() {
       .thenValue([this, gv](StorageRpcResponse<GetPropResponse> &&rpcResp) {
         memory::MemoryCheckGuard guard;
         SCOPED_TIMER(&execTime_);
-        addStats(rpcResp, otherStats_);
+        addStats(rpcResp);
         return handleResp(std::move(rpcResp), gv->colNames());
       });
 }
diff --git a/src/graph/executor/query/IndexScanExecutor.cpp b/src/graph/executor/query/IndexScanExecutor.cpp
index 8bbfa8addd5..4341a69a49c 100644
--- a/src/graph/executor/query/IndexScanExecutor.cpp
+++ b/src/graph/executor/query/IndexScanExecutor.cpp
@@ -44,7 +44,7 @@ folly::Future<Status> IndexScanExecutor::indexScan() {
       .thenValue([this](StorageRpcResponse<LookupIndexResp> &&rpcResp) {
         // MemoryTrackerVerified
         memory::MemoryCheckGuard guard;
-        addStats(rpcResp, otherStats_);
+        addStats(rpcResp);
         return handleResp(std::move(rpcResp));
       });
 }
diff --git a/src/graph/executor/query/ScanEdgesExecutor.cpp b/src/graph/executor/query/ScanEdgesExecutor.cpp
index 769567620b2..7ff36758906 100644
--- a/src/graph/executor/query/ScanEdgesExecutor.cpp
+++ b/src/graph/executor/query/ScanEdgesExecutor.cpp
@@ -43,7 +43,7 @@ folly::Future<Status> ScanEdgesExecutor::scanEdges() {
       .thenValue([this](StorageRpcResponse<ScanResponse> &&rpcResp) {
         memory::MemoryCheckGuard guard;
         SCOPED_TIMER(&execTime_);
-        addStats(rpcResp, otherStats_);
+        addStats(rpcResp);
         return handleResp(std::move(rpcResp), {});
       });
 }
diff --git a/src/graph/executor/query/ScanVerticesExecutor.cpp b/src/graph/executor/query/ScanVerticesExecutor.cpp
index ba15ced7412..130ecf4712b 100644
--- a/src/graph/executor/query/ScanVerticesExecutor.cpp
+++ b/src/graph/executor/query/ScanVerticesExecutor.cpp
@@ -44,7 +44,7 @@ folly::Future<Status> ScanVerticesExecutor::scanVertices() {
       .thenValue([this, sv](StorageRpcResponse<ScanResponse> &&rpcResp) {
         memory::MemoryCheckGuard guard;
         SCOPED_TIMER(&execTime_);
-        addStats(rpcResp, otherStats_);
+        addStats(rpcResp);
         return handleResp(std::move(rpcResp), sv->colNames());
       });
 }
diff --git a/src/graph/executor/query/TraverseExecutor.cpp b/src/graph/executor/query/TraverseExecutor.cpp
index 74fc8298768..3c34b8c6255 100644
--- a/src/graph/executor/query/TraverseExecutor.cpp
+++ b/src/graph/executor/query/TraverseExecutor.cpp
@@ -107,7 +107,7 @@ folly::Future<Status> TraverseExecutor::getNeighbors() {
         addStats(resp, getNbrTime.elapsedInUSec());
         time::Duration expandTime;
         return handleResponse(std::move(resp)).ensure([this, expandTime]() {
-          otherStats_.emplace("expandTime", folly::sformat("{}(us)", expandTime.elapsedInUSec()));
+          addState("expandTime", expandTime.elapsedInUSec());
         });
       })
       .thenValue([this](Status s) -> folly::Future<Status> {
@@ -149,7 +149,7 @@ void TraverseExecutor::addStats(RpcResponse& resp, int64_t getNbrTimeInUSec) {
   folly::dynamic stepObj = folly::dynamic::object();
   stepObj.insert("storage", stepInfo);
   stepObj.insert("total_rpc_time", folly::sformat("{}(us)", getNbrTimeInUSec));
-  otherStats_.emplace(folly::sformat("step[{}]", currentStep_), folly::toPrettyJson(stepObj));
+  addState(folly::sformat("step[{}]", currentStep_), std::move(stepObj));
 }
 
 size_t TraverseExecutor::numRowsOfRpcResp(const RpcResponse& resps) const {
@@ -240,13 +240,12 @@ folly::Future<Status> TraverseExecutor::asyncExpandOneStep(RpcResponse&& resps)
           }
         }
 
-        auto t = postTaskTime.elapsedInUSec();
-        otherStats_.emplace("expandPostTaskTime", folly::sformat("{}(us)", t));
+        addState("expandPostTaskTime", postTaskTime.elapsedInUSec());
         folly::dynamic taskRunTimeArray = folly::dynamic::array();
         for (auto time : *taskRunTime) {
           taskRunTimeArray.push_back(time);
         }
-        otherStats_.emplace("expandTaskRunTime", folly::toPrettyJson(taskRunTimeArray));
+        addState("expandTaskRunTime", std::move(taskRunTimeArray));
 
         return Status::OK();
       });