diff --git a/source/libs/qworker/inc/qworkerInt.h b/source/libs/qworker/inc/qworkerInt.h
index 5f9b33f7e301b326c019eb6e1fdf83c85e455355..9a332684722b40926739eb557a83def16caea289 100644
--- a/source/libs/qworker/inc/qworkerInt.h
+++ b/source/libs/qworker/inc/qworkerInt.h
@@ -83,7 +83,7 @@ typedef struct SQWMsg {
 } SQWMsg;
 
 typedef struct SQWPhaseInput {
-  int8_t         status;
+  int8_t         taskStatus;
   int8_t         taskType;
   int32_t        code;
   qTaskInfo_t    taskHandle;
diff --git a/source/libs/qworker/src/qworker.c b/source/libs/qworker/src/qworker.c
index 566356e25595b75cb2e58de8d3fc72a858ddf99e..cedb3fa926b8f3b31236f082b890107673f9434e 100644
--- a/source/libs/qworker/src/qworker.c
+++ b/source/libs/qworker/src/qworker.c
@@ -240,14 +240,14 @@ void qwReleaseTaskStatus(int32_t rwType, SQWSchStatus *sch) {
 }
 
 
-int32_t qwAcquireTaskCtx(SQWorkerMgmt *mgmt, uint64_t sId, uint64_t qId, uint64_t tId, int32_t rwType, SQWTaskCtx **ctx) {
+int32_t qwAcquireTaskCtx(SQWorkerMgmt *mgmt, uint64_t sId, uint64_t qId, uint64_t tId, SQWTaskCtx **ctx) {
   char id[sizeof(qId) + sizeof(tId)] = {0};
   QW_SET_QTID(id, qId, tId);
   
-  QW_LOCK(rwType, &mgmt->ctxLock);
-  *ctx = taosHashGet(mgmt->ctxHash, id, sizeof(id));
+  //QW_LOCK(rwType, &mgmt->ctxLock);
+  *ctx = taosHashAcquire(mgmt->ctxHash, id, sizeof(id));
   if (NULL == (*ctx)) {
-    QW_UNLOCK(rwType, &mgmt->ctxLock);
+    //QW_UNLOCK(rwType, &mgmt->ctxLock);
     QW_TASK_ELOG("ctx not in ctxHash, id:%s", id);
     QW_ERR_RET(TSDB_CODE_QRY_RES_CACHE_NOT_EXIST);
   }
@@ -268,19 +268,19 @@ int32_t qwGetTaskCtx(SQWorkerMgmt *mgmt, uint64_t sId, uint64_t qId, uint64_t tI
   return TSDB_CODE_SUCCESS;
 }
 
-int32_t qwAddTaskCtxImpl(SQWorkerMgmt *mgmt, uint64_t sId, uint64_t qId, uint64_t tId, int32_t rwType, int32_t status, SQWTaskCtx **ctx) {
+int32_t qwAddTaskCtxImpl(SQWorkerMgmt *mgmt, uint64_t sId, uint64_t qId, uint64_t tId, bool acquire, int32_t status, SQWTaskCtx **ctx) {
   char id[sizeof(qId) + sizeof(tId)] = {0};
   QW_SET_QTID(id, qId, tId);
 
   SQWTaskCtx nctx = {0};
 
-  QW_LOCK(QW_WRITE, &mgmt->ctxLock);
+  //QW_LOCK(QW_WRITE, &mgmt->ctxLock);
   int32_t code = taosHashPut(mgmt->ctxHash, id, sizeof(id), &nctx, sizeof(SQWTaskCtx));
   if (0 != code) {
-    QW_UNLOCK(QW_WRITE, &mgmt->ctxLock);
+    //QW_UNLOCK(QW_WRITE, &mgmt->ctxLock);
     
     if (HASH_NODE_EXIST(code)) {
-      if (rwType && ctx) {
+      if (acquire && ctx) {
         QW_RET(qwAcquireTaskCtx(QW_FPARAMS(), rwType, ctx));
       } else if (ctx) {
         QW_RET(qwGetTaskCtx(QW_FPARAMS(), ctx));
@@ -293,9 +293,9 @@ int32_t qwAddTaskCtxImpl(SQWorkerMgmt *mgmt, uint64_t sId, uint64_t qId, uint64_
       QW_ERR_RET(TSDB_CODE_QRY_OUT_OF_MEMORY);
     }
   }
-  QW_UNLOCK(QW_WRITE, &mgmt->ctxLock);
+  //QW_UNLOCK(QW_WRITE, &mgmt->ctxLock);
 
-  if (rwType && ctx) {
+  if (acquire && ctx) {
     QW_RET(qwAcquireTaskCtx(QW_FPARAMS(), rwType, ctx));
   } else if (ctx) {
     QW_RET(qwGetTaskCtx(QW_FPARAMS(), ctx));
@@ -305,22 +305,23 @@ int32_t qwAddTaskCtxImpl(SQWorkerMgmt *mgmt, uint64_t sId, uint64_t qId, uint64_
 }
 
 int32_t qwAddTaskCtx(SQWorkerMgmt *mgmt, uint64_t sId, uint64_t qId, uint64_t tId) {
-  QW_RET(qwAddTaskCtxImpl(QW_FPARAMS(), 0, 0, NULL));
+  QW_RET(qwAddTaskCtxImpl(QW_FPARAMS(), false, 0, NULL));
 }
 
 
 
-int32_t qwAddAcquireTaskCtx(SQWorkerMgmt *mgmt, uint64_t sId, uint64_t qId, uint64_t tId, int32_t rwType, SQWTaskCtx **ctx) {
-  return qwAddTaskCtxImpl(QW_FPARAMS(), rwType, 0, ctx);
+int32_t qwAddAcquireTaskCtx(SQWorkerMgmt *mgmt, uint64_t sId, uint64_t qId, uint64_t tId, SQWTaskCtx **ctx) {
+  return qwAddTaskCtxImpl(QW_FPARAMS(), true, 0, ctx);
 }
 
 int32_t qwAddGetTaskCtx(SQWorkerMgmt *mgmt, uint64_t sId, uint64_t qId, uint64_t tId, SQWTaskCtx **ctx) {
-  return qwAddTaskCtxImpl(QW_FPARAMS(), 0, 0, ctx);
+  return qwAddTaskCtxImpl(QW_FPARAMS(), false, 0, ctx);
 }
 
 
-void qwReleaseTaskCtx(int32_t rwType, SQWorkerMgmt *mgmt) {
-  QW_UNLOCK(rwType, &mgmt->ctxLock);
+void qwReleaseTaskCtx(SQWorkerMgmt *mgmt, void *ctx) {
+  //QW_UNLOCK(rwType, &mgmt->ctxLock);
+  taosHashRelease(mgmt->ctxHash, ctx);
 }
 
 void qwFreeTaskHandle(QW_FPARAMS_DEF, qTaskInfo_t *taskHandle) {  
@@ -355,7 +356,7 @@ void qwFreeTask(QW_FPARAMS_DEF, SQWTaskCtx *ctx) {
 
 
 // Note: NEED CTX HASH LOCKED BEFORE ENTRANCE
-int32_t qwDropTaskCtx(SQWorkerMgmt *mgmt, uint64_t sId, uint64_t qId, uint64_t tId) {
+int32_t qwDropTaskCtx(SQWorkerMgmt *mgmt, uint64_t sId, uint64_t qId, uint64_t tId, int32_t rwType) {
   char id[sizeof(qId) + sizeof(tId)] = {0};
   QW_SET_QTID(id, qId, tId);
   SQWTaskCtx octx;
@@ -367,6 +368,13 @@ int32_t qwDropTaskCtx(SQWorkerMgmt *mgmt, uint64_t sId, uint64_t qId, uint64_t t
 
   octx = *ctx;
 
+  atomic_store_ptr(&ctx->taskHandle, NULL);
+  atomic_store_ptr(&ctx->sinkHandle, NULL);
+
+  if (rwType) {
+    QW_UNLOCK(rwType, &ctx->lock);
+  }
+
   if (taosHashRemove(mgmt->ctxHash, id, sizeof(id))) {
     QW_TASK_ELOG_E("taosHashRemove from ctx hash failed");    
     QW_ERR_RET(TSDB_CODE_QRY_RES_CACHE_NOT_EXIST);
@@ -439,7 +447,7 @@ _return:
   QW_RET(code);
 }
 
-int32_t qwExecTask(QW_FPARAMS_DEF, qTaskInfo_t *taskHandle, DataSinkHandle sinkHandle, int8_t taskType) {
+int32_t qwExecTask(QW_FPARAMS_DEF, qTaskInfo_t *taskHandle, DataSinkHandle sinkHandle, int8_t taskType, bool execOnce) {
   int32_t code = 0;
   bool  qcontinue = true;
   SSDataBlock* pRes = NULL;
@@ -463,6 +471,7 @@ int32_t qwExecTask(QW_FPARAMS_DEF, qTaskInfo_t *taskHandle, DataSinkHandle sinkH
       if (TASK_TYPE_TEMP == taskType) {
         qwFreeTaskHandle(QW_FPARAMS(), taskHandle);
       }
+      
       break;
     }
 
@@ -475,7 +484,7 @@ int32_t qwExecTask(QW_FPARAMS_DEF, qTaskInfo_t *taskHandle, DataSinkHandle sinkH
 
     QW_TASK_DLOG("data put into sink, rows:%d, continueExecTask:%d", pRes->info.rows, qcontinue);
     
-    if (!qcontinue) {
+    if (execOnce || (!qcontinue)) {
       break;
     }
   }
@@ -573,7 +582,6 @@ int32_t qwHandleTaskEvent(QW_FPARAMS_DEF, int8_t phase, SQWPhaseInput *input, SQ
   int8_t status = 0;
   SQWTaskCtx *ctx = NULL;
   bool locked = false;
-  bool ctxAcquired = false;
   void *readyConnection = NULL;
   void *dropConnection = NULL;
   void *cancelConnection = NULL;
@@ -582,7 +590,9 @@ int32_t qwHandleTaskEvent(QW_FPARAMS_DEF, int8_t phase, SQWPhaseInput *input, SQ
 
   switch (phase) {
     case QW_PHASE_PRE_QUERY: {
-      QW_ERR_JRET(qwAddGetTaskCtx(QW_FPARAMS(), &ctx));
+      QW_ERR_JRET(qwAddAcquireTaskCtx(QW_FPARAMS(), &ctx));
+
+      QW_LOCK(QW_WRITE, &ctx->lock);
             
       atomic_store_32(&ctx->phase, phase);
       atomic_store_8(&ctx->taskType, input->taskType);
@@ -597,7 +607,7 @@ int32_t qwHandleTaskEvent(QW_FPARAMS_DEF, int8_t phase, SQWPhaseInput *input, SQ
 
       if (QW_IS_EVENT_RECEIVED(ctx, QW_EVENT_DROP)) {
         QW_ERR_JRET(qwDropTaskStatus(QW_FPARAMS()));              
-        QW_ERR_JRET(qwDropTaskCtx(QW_FPARAMS()));
+        QW_ERR_JRET(qwDropTaskCtx(QW_FPARAMS(), QW_WRITE));
 
         output->needStop = true;
         output->rspCode = TSDB_CODE_QRY_TASK_DROPPED;
@@ -621,7 +631,7 @@ int32_t qwHandleTaskEvent(QW_FPARAMS_DEF, int8_t phase, SQWPhaseInput *input, SQ
       break;
     }
     case QW_PHASE_POST_QUERY: {
-      QW_ERR_JRET(qwGetTaskCtx(QW_FPARAMS(), &ctx));
+      QW_ERR_JRET(qwAcquireTaskCtx(QW_FPARAMS(), &ctx));
       
       QW_LOCK(QW_WRITE, &ctx->lock);
       
@@ -641,8 +651,8 @@ int32_t qwHandleTaskEvent(QW_FPARAMS_DEF, int8_t phase, SQWPhaseInput *input, SQ
       if (QW_IS_EVENT_RECEIVED(ctx, QW_EVENT_DROP)) {
         output->needStop = true;
 
-        QW_ERR_JRET(qwDropTaskStatus(QW_FPARAMS()));              
-        QW_ERR_JRET(qwDropTaskCtx(QW_FPARAMS()));
+        QW_ERR_JRET(qwDropTaskStatus(QW_FPARAMS()));  
+        QW_ERR_JRET(qwDropTaskCtx(QW_FPARAMS(), QW_WRITE));
         
         output->rspCode = TSDB_CODE_QRY_TASK_DROPPED;
         dropConnection = ctx->dropConnection;
@@ -665,13 +675,12 @@ int32_t qwHandleTaskEvent(QW_FPARAMS_DEF, int8_t phase, SQWPhaseInput *input, SQ
       }
 
       if (!output->needStop) {      
-        QW_ERR_JRET(qwUpdateTaskStatus(QW_FPARAMS(), input->status));
+        QW_ERR_JRET(qwUpdateTaskStatus(QW_FPARAMS(), input->taskStatus));
       }
       break;
     }
     case QW_PHASE_PRE_FETCH: {
       QW_ERR_JRET(qwAcquireTaskCtx(QW_FPARAMS(), QW_READ, &ctx));
-      ctxAcquired = true;
       
       QW_LOCK(QW_WRITE, &ctx->lock);
       
@@ -686,6 +695,13 @@ int32_t qwHandleTaskEvent(QW_FPARAMS_DEF, int8_t phase, SQWPhaseInput *input, SQ
         QW_ERR_JRET(TSDB_CODE_QRY_TASK_CANCELLED);
       }
 
+      if (QW_IS_EVENT_PROCESSED(ctx, QW_EVENT_DROP)) {
+        QW_TASK_WLOG("task already dropped, phase:%d", phase);
+        output->needStop = true;
+        output->rspCode = TSDB_CODE_QRY_TASK_DROPPED;        
+        QW_ERR_JRET(TSDB_CODE_QRY_TASK_DROPPED);
+      }
+
       if (QW_IS_EVENT_RECEIVED(ctx, QW_EVENT_DROP)) {
         QW_TASK_ELOG("drop event at wrong phase, phase:%d", phase);
         output->needStop = true;
@@ -721,7 +737,7 @@ int32_t qwHandleTaskEvent(QW_FPARAMS_DEF, int8_t phase, SQWPhaseInput *input, SQ
       break;
     }    
     case QW_PHASE_POST_FETCH: {
-      QW_ERR_JRET(qwGetTaskCtx(QW_FPARAMS(), &ctx));
+      QW_ERR_JRET(qwAcquireTaskCtx(QW_FPARAMS(), &ctx));
       
       QW_LOCK(QW_WRITE, &ctx->lock);
       
@@ -743,7 +759,7 @@ int32_t qwHandleTaskEvent(QW_FPARAMS_DEF, int8_t phase, SQWPhaseInput *input, SQ
         output->needStop = true;
 
         QW_ERR_JRET(qwDropTaskStatus(QW_FPARAMS()));              
-        QW_ERR_JRET(qwDropTaskCtx(QW_FPARAMS()));
+        QW_ERR_JRET(qwDropTaskCtx(QW_FPARAMS(), QW_WRITE));
         
         output->rspCode = TSDB_CODE_QRY_TASK_DROPPED;
         dropConnection = ctx->dropConnection;
@@ -772,7 +788,6 @@ int32_t qwHandleTaskEvent(QW_FPARAMS_DEF, int8_t phase, SQWPhaseInput *input, SQ
     }    
     case QW_PHASE_PRE_CQUERY: {
       QW_ERR_JRET(qwAcquireTaskCtx(QW_FPARAMS(), QW_READ, &ctx));
-      ctxAcquired = true;
       
       QW_LOCK(QW_WRITE, &ctx->lock);
       
@@ -808,7 +823,7 @@ int32_t qwHandleTaskEvent(QW_FPARAMS_DEF, int8_t phase, SQWPhaseInput *input, SQ
       break;
     }    
     case QW_PHASE_POST_CQUERY: {
-      QW_ERR_JRET(qwGetTaskCtx(QW_FPARAMS(), &ctx));
+      QW_ERR_JRET(qwAcquireTaskCtx(QW_FPARAMS(), &ctx));
       
       QW_LOCK(QW_WRITE, &ctx->lock);
       
@@ -829,8 +844,8 @@ int32_t qwHandleTaskEvent(QW_FPARAMS_DEF, int8_t phase, SQWPhaseInput *input, SQ
         QW_TASK_WLOG("start to drop task, phase:%d", phase);
         output->needStop = true;
 
-        QW_ERR_JRET(qwDropTaskStatus(QW_FPARAMS()));              
-        QW_ERR_JRET(qwDropTaskCtx(QW_FPARAMS()));
+        QW_ERR_JRET(qwDropTaskStatus(QW_FPARAMS()));        
+        QW_ERR_JRET(qwDropTaskCtx(QW_FPARAMS(), QW_WRITE));
         
         output->rspCode = TSDB_CODE_QRY_TASK_DROPPED;
         dropConnection = ctx->dropConnection;
@@ -871,8 +886,8 @@ _return:
     QW_UNLOCK(QW_WRITE, &ctx->lock);
   }
 
-  if (ctxAcquired && ctx) {
-    qwReleaseTaskCtx(QW_READ, mgmt);
+  if (ctx) {
+    qwReleaseTaskCtx(mgmt, ctx);
   }
 
   if (readyConnection) {
@@ -896,7 +911,7 @@ _return:
 }
 
 
-int32_t qwProcessQuery(SQWorkerMgmt *mgmt, uint64_t sId, uint64_t qId, uint64_t tId, SQWMsg *qwMsg, int8_t taskType) {
+int32_t qwProcessQuery(QW_FPARAMS_DEF, SQWMsg *qwMsg, int8_t taskType) {
   int32_t code = 0;
   bool queryRsped = false;
   bool needStop = false;
@@ -944,7 +959,7 @@ int32_t qwProcessQuery(SQWorkerMgmt *mgmt, uint64_t sId, uint64_t qId, uint64_t
   queryRsped = true;
 
   if (pTaskInfo && sinkHandle) {
-    QW_ERR_JRET(qwExecTask(QW_FPARAMS(), &pTaskInfo, sinkHandle, taskType));
+    QW_ERR_JRET(qwExecTask(QW_FPARAMS(), &pTaskInfo, sinkHandle, taskType, true));
   }
   
 _return:
@@ -954,14 +969,8 @@ _return:
   }
   
   if (!queryRsped) {
-    code = qwBuildAndSendQueryRsp(qwMsg->connection, rspCode);
-    if (TSDB_CODE_SUCCESS == code) {
-      QW_TASK_DLOG("query msg rsped, code:%d", rspCode);
-    }
-    
-    if (TSDB_CODE_SUCCESS == rspCode && code) {
-      rspCode = code;
-    }
+    qwBuildAndSendQueryRsp(qwMsg->connection, rspCode);
+    QW_TASK_DLOG("query msg rsped, code:%x", rspCode);
   }
 
   if (needStop) {
@@ -971,12 +980,7 @@ _return:
   input.code = rspCode;
   input.taskHandle = pTaskInfo;
   input.sinkHandle = sinkHandle;
-  
-  if (TSDB_CODE_SUCCESS != rspCode) {
-    input.status = JOB_TASK_STATUS_FAILED;
-  } else {
-    input.status = JOB_TASK_STATUS_PARTIAL_SUCCEED;
-  }
+  input.taskStatus = rspCode ? JOB_TASK_STATUS_FAILED : JOB_TASK_STATUS_PARTIAL_SUCCEED;
   
   QW_ERR_RET(qwHandleTaskEvent(QW_FPARAMS(), QW_PHASE_POST_QUERY, &input, &output));
   
@@ -989,8 +993,8 @@ int32_t qwProcessReady(SQWorkerMgmt *mgmt, uint64_t sId, uint64_t qId, uint64_t
   int8_t phase = 0;
   bool needRsp = false;
   int32_t rspCode = 0;
-  
-  QW_ERR_JRET(qwGetTaskCtx(QW_FPARAMS(), &ctx));
+
+  QW_ERR_JRET(qwAcquireTaskCtx(QW_FPARAMS(), &ctx));
 
   QW_LOCK(QW_WRITE, &ctx->lock);
 
@@ -1020,6 +1024,7 @@ _return:
 
   if (ctx) {
     QW_UNLOCK(QW_WRITE, &ctx->lock);
+    qwReleaseTaskCtx(mgmt, ctx);
   }
 
   if (needRsp) {
@@ -1059,7 +1064,7 @@ int32_t qwProcessCQuery(SQWorkerMgmt *mgmt, uint64_t sId, uint64_t qId, uint64_t
 
     DataSinkHandle  sinkHandle = ctx->sinkHandle;
 
-    QW_ERR_JRET(qwExecTask(QW_FPARAMS(), &ctx->taskHandle, sinkHandle, ctx->taskType));
+    QW_ERR_JRET(qwExecTask(QW_FPARAMS(), &ctx->taskHandle, sinkHandle, ctx->taskType, QW_IS_EVENT_RECEIVED(ctx, QW_EVENT_FETCH)));
 
     if (QW_IS_EVENT_RECEIVED(ctx, QW_EVENT_FETCH)) {
       SOutputData sOutput = {0};
@@ -1191,7 +1196,7 @@ int32_t qwProcessDrop(SQWorkerMgmt *mgmt, uint64_t sId, uint64_t qId, uint64_t t
   SQWTaskCtx *ctx = NULL;
   bool locked = false;
 
-  QW_ERR_JRET(qwAddAcquireTaskCtx(QW_FPARAMS(), QW_WRITE, &ctx));
+  QW_ERR_JRET(qwAddAcquireTaskCtx(QW_FPARAMS(), &ctx));
   
   QW_LOCK(QW_WRITE, &ctx->lock);
 
@@ -1210,7 +1215,7 @@ int32_t qwProcessDrop(SQWorkerMgmt *mgmt, uint64_t sId, uint64_t qId, uint64_t t
     ctx->dropConnection = qwMsg->connection;
   } else if (ctx->phase > 0) {
     QW_ERR_JRET(qwDropTaskStatus(QW_FPARAMS()));
-    QW_ERR_JRET(qwDropTaskCtx(QW_FPARAMS()));
+    QW_ERR_JRET(qwDropTaskCtx(QW_FPARAMS(), QW_WRITE));
 
     locked = false;
     needRsp = true;
@@ -1226,12 +1231,8 @@ _return:
     QW_SET_RSP_CODE(ctx, code);
   }
 
-  if (locked) {
-    QW_UNLOCK(QW_WRITE, &ctx->lock);
-  }
-
   if (ctx) {
-    qwReleaseTaskCtx(QW_WRITE, mgmt);
+    qwReleaseTaskCtx(mgmt, ctx);
   }
 
   if (TSDB_CODE_SUCCESS != code || needRsp) {
diff --git a/source/libs/qworker/src/qworkerMsg.c b/source/libs/qworker/src/qworkerMsg.c
index feb8fd645efda3387d9de1661591a9cfb52abdec..0b1200745bc2983d92dc81eb98ee69cc3ab4e548 100644
--- a/source/libs/qworker/src/qworkerMsg.c
+++ b/source/libs/qworker/src/qworkerMsg.c
@@ -273,7 +273,7 @@ int32_t qWorkerProcessQueryMsg(void *node, void *qWorkerMgmt, SRpcMsg *pMsg) {
   SQWorkerMgmt *mgmt = (SQWorkerMgmt *)qWorkerMgmt;
   
   if (NULL == msg || pMsg->contLen <= sizeof(*msg)) {
-    QW_ELOG("invalid query msg, contLen:%d", pMsg->contLen);
+    QW_ELOG("invalid query msg, msg:%p, msgLen:%d", msg, pMsg->contLen);
     QW_ERR_RET(TSDB_CODE_QRY_INVALID_INPUT);
   }
 
@@ -307,7 +307,7 @@ int32_t qWorkerProcessCQueryMsg(void *node, void *qWorkerMgmt, SRpcMsg *pMsg) {
   SQWorkerMgmt *mgmt = (SQWorkerMgmt *)qWorkerMgmt;
 
   if (NULL == msg || pMsg->contLen <= sizeof(*msg)) {
-    QW_ELOG("invalid cquery msg, contLen:%d", pMsg->contLen);
+    QW_ELOG("invalid cquery msg, msg:%p, msgLen:%d", msg, pMsg->contLen);
     QW_ERR_RET(TSDB_CODE_QRY_INVALID_INPUT);
   }
 
@@ -337,7 +337,7 @@ int32_t qWorkerProcessReadyMsg(void *node, void *qWorkerMgmt, SRpcMsg *pMsg){
 
   SResReadyReq *msg = pMsg->pCont;
   if (NULL == msg || pMsg->contLen < sizeof(*msg)) {
-    qError("invalid task status msg");  
+    QW_ELOG("invalid task ready msg, msg:%p, msgLen:%d", msg, pMsg->contLen);
     QW_ERR_RET(TSDB_CODE_QRY_INVALID_INPUT);
   }  
 
@@ -398,6 +398,7 @@ int32_t qWorkerProcessFetchMsg(void *node, void *qWorkerMgmt, SRpcMsg *pMsg) {
   SQWorkerMgmt *mgmt = (SQWorkerMgmt *)qWorkerMgmt;
   
   if (NULL == msg || pMsg->contLen < sizeof(*msg)) {
+    QW_ELOG("invalid fetch msg, msg:%p, msgLen:%d", msg, pMsg->contLen);  
     QW_ERR_RET(TSDB_CODE_QRY_INVALID_INPUT);
   }