diff --git a/include/util/tarray.h b/include/util/tarray.h
index a8510e4bc8295e7e40092ea5ae687717bda20676..278f9f6baba4fcf8e8d8b7a233228b96e4921377 100644
--- a/include/util/tarray.h
+++ b/include/util/tarray.h
@@ -69,14 +69,6 @@ void* taosArrayAddBatch(SArray* pArray, const void* pData, int32_t nEles);
  */
 void taosArrayRemoveDuplicate(SArray* pArray, __compar_fn_t comparFn, void (*fp)(void*));
 
-/**
- *
- * @param pArray
- * @param comparFn
- * @param fp
- */
-void taosArrayRemoveDuplicateP(SArray* pArray, __compar_fn_t comparFn, void (*fp)(void*));
-
 /**
  *  add all element from the source array list into the destination
  * @param pArray
@@ -252,14 +244,6 @@ void taosArraySortPWithExt(SArray* pArray, __ext_compar_fn_t fn, const void* par
 int32_t taosEncodeArray(void** buf, const SArray* pArray, FEncode encode);
 void*   taosDecodeArray(const void* buf, SArray** pArray, FDecode decode, int32_t dataSz);
 
-/**
- * swap array
- * @param a
- * @param b
- * @return
- */
-void taosArraySwap(SArray* a, SArray* b);
-
 #ifdef __cplusplus
 }
 #endif
diff --git a/source/dnode/mnode/impl/src/mndConsumer.c b/source/dnode/mnode/impl/src/mndConsumer.c
index 2f560910d430048a653aa0209c1aeb1e6e3a56bb..616f69cd5ba7598c2aa8f9e7afd486011962e908 100644
--- a/source/dnode/mnode/impl/src/mndConsumer.c
+++ b/source/dnode/mnode/impl/src/mndConsumer.c
@@ -601,6 +601,13 @@ static void* topicNameDup(void* p){
   return taosStrdup((char*) p);
 }
 
+static void freeItem(void* param) {
+  void* pItem = *(void**)param;
+  if (pItem != NULL) {
+    taosMemoryFree(pItem);
+  }
+}
+
 int32_t mndProcessSubscribeReq(SRpcMsg *pMsg) {
   SMnode *pMnode = pMsg->info.node;
   char   *msgStr = pMsg->pCont;
@@ -616,7 +623,7 @@ int32_t mndProcessSubscribeReq(SRpcMsg *pMsg) {
   int32_t code = -1;
   SArray *pTopicList = subscribe.topicNames;
   taosArraySort(pTopicList, taosArrayCompareString);
-  taosArrayRemoveDuplicateP(pTopicList, taosArrayCompareString, taosMemoryFree);
+  taosArrayRemoveDuplicate(pTopicList, taosArrayCompareString, freeItem);
 
   int32_t newTopicNum = taosArrayGetSize(pTopicList);
 
diff --git a/source/dnode/vnode/src/tq/tq.c b/source/dnode/vnode/src/tq/tq.c
index de2732fcb550f1332c48ec58521bb708c8a33618..5210a8cc66bced3f5bdc9f7f28dc3942f62b2e5a 100644
--- a/source/dnode/vnode/src/tq/tq.c
+++ b/source/dnode/vnode/src/tq/tq.c
@@ -885,6 +885,12 @@ int32_t tqProcessSubscribeReq(STQ* pTq, int64_t sversion, char* msg, int32_t msg
       tqInfo("vgId:%d switch consumer from Id:0x%" PRIx64 " to Id:0x%" PRIx64, req.vgId, pHandle->consumerId,
              req.newConsumerId);
 
+      // kill executing task
+      qTaskInfo_t pTaskInfo = pHandle->execHandle.task;
+      if (pTaskInfo != NULL) {
+//        qAsyncKillTask(pTaskInfo);
+      }
+
       taosWLockLatch(&pTq->lock);
       atomic_store_32(&pHandle->epoch, -1);
 
@@ -895,7 +901,12 @@ int32_t tqProcessSubscribeReq(STQ* pTq, int64_t sversion, char* msg, int32_t msg
       atomic_add_fetch_32(&pHandle->epoch, 1);
 
       if (pHandle->execHandle.subType == TOPIC_SUB_TYPE__COLUMN) {
-        qStreamCloseTsdbReader(pHandle->execHandle.task);
+        qStreamCloseTsdbReader(pTaskInfo);
+      }
+
+      // reset the error code.
+      if (pHandle->execHandle.task != NULL) {
+
       }
 
       taosWUnLockLatch(&pTq->lock);
diff --git a/source/dnode/vnode/src/tq/tqExec.c b/source/dnode/vnode/src/tq/tqExec.c
index a62101eb4702442a580b2bfee33643106df41767..ce86a6757e5388d8895ea31dd4dddb6b4c01a2ed 100644
--- a/source/dnode/vnode/src/tq/tqExec.c
+++ b/source/dnode/vnode/src/tq/tqExec.c
@@ -65,16 +65,17 @@ int32_t tqScanData(STQ* pTq, const STqHandle* pHandle, SMqDataRsp* pRsp, STqOffs
   const STqExecHandle* pExec = &pHandle->execHandle;
 
   qTaskInfo_t task = pExec->task;
+  int32_t vgId = TD_VID(pTq->pVnode);
 
   if (qStreamPrepareScan(task, pOffset, pHandle->execHandle.subType) < 0) {
-    tqDebug("prepare scan failed, return");
+    tqDebug("prepare scan failed, return, consumer:0x%"PRIx64, pHandle->consumerId);
     if (pOffset->type == TMQ_OFFSET__LOG) {
       pRsp->rspOffset = *pOffset;
       return 0;
     } else {
       tqOffsetResetToLog(pOffset, pHandle->snapshotVer);
       if (qStreamPrepareScan(task, pOffset, pHandle->execHandle.subType) < 0) {
-        tqDebug("prepare scan failed, return");
+        tqDebug("prepare scan failed, return, consumer:0x%"PRIx64, pHandle->consumerId);
         pRsp->rspOffset = *pOffset;
         return 0;
       }
@@ -86,13 +87,14 @@ int32_t tqScanData(STQ* pTq, const STqHandle* pHandle, SMqDataRsp* pRsp, STqOffs
     SSDataBlock* pDataBlock = NULL;
     uint64_t     ts = 0;
 
-    tqDebug("vgId:%d, tmq task start to execute", pTq->pVnode->config.vgId);
+    tqDebug("vgId:%d, tmq task start to execute, consumer:0x%"PRIx64, vgId, pHandle->consumerId);
     if (qExecTask(task, &pDataBlock, &ts) < 0) {
-      tqError("vgId:%d, task exec error since %s", pTq->pVnode->config.vgId, terrstr());
+      tqError("vgId:%d, task exec error since %s, consumer:0x%" PRIx64, vgId, terrstr(),
+              pHandle->consumerId);
       return -1;
     }
 
-    tqDebug("consumer:0x%"PRIx64" vgId:%d, tmq task executed, get %p", pHandle->consumerId, pTq->pVnode->config.vgId, pDataBlock);
+    tqDebug("consumer:0x%"PRIx64" vgId:%d, tmq task executed, get %p", pHandle->consumerId, vgId, pDataBlock);
 
     // current scan should be stopped asap, since the rebalance occurs.
     if (pDataBlock == NULL) {
@@ -115,15 +117,16 @@ int32_t tqScanData(STQ* pTq, const STqHandle* pHandle, SMqDataRsp* pRsp, STqOffs
   }
 
   if (pRsp->rspOffset.type == 0) {
-    tqError("expected rsp offset: type %d %" PRId64 " %" PRId64 " %" PRId64, pRsp->rspOffset.type, pRsp->rspOffset.ts,
-            pRsp->rspOffset.uid, pRsp->rspOffset.version);
+    tqError("vgId:%d, expected rsp offset: type %d %" PRId64 " %" PRId64 " %" PRId64, vgId, pRsp->rspOffset.type,
+            pRsp->rspOffset.ts, pRsp->rspOffset.uid, pRsp->rspOffset.version);
     return -1;
   }
 
   if (pRsp->withTbName || pRsp->withSchema) {
-    tqError("get column should not with meta:%d,%d", pRsp->withTbName, pRsp->withSchema);
+    tqError("vgId:%d, get column should not with meta:%d,%d", vgId, pRsp->withTbName, pRsp->withSchema);
     return -1;
   }
+
   return 0;
 }
 
diff --git a/source/libs/executor/src/executorimpl.c b/source/libs/executor/src/executorimpl.c
index 67174c3267124ec380cd9e55d388fa9071b474df..24a26d575a0c99a127afdda407b76b203054d13a 100644
--- a/source/libs/executor/src/executorimpl.c
+++ b/source/libs/executor/src/executorimpl.c
@@ -633,7 +633,7 @@ void setBlockSMAInfo(SqlFunctionCtx* pCtx, SExprInfo* pExprInfo, SSDataBlock* pB
   }
 }
 
-bool isTaskKilled(SExecTaskInfo* pTaskInfo) { return (0 != pTaskInfo->code) ? true : false; }
+bool isTaskKilled(SExecTaskInfo* pTaskInfo) { return (0 != pTaskInfo->code);}
 
 void setTaskKilled(SExecTaskInfo* pTaskInfo, int32_t rspCode) { pTaskInfo->code = rspCode; }
 
diff --git a/source/util/src/tarray.c b/source/util/src/tarray.c
index 7467fa29481d932632b612fc44550fd024542fc3..6c1d3e17bb6b05786629bd1d2ec02588a9d083a5 100644
--- a/source/util/src/tarray.c
+++ b/source/util/src/tarray.c
@@ -140,46 +140,7 @@ void taosArrayRemoveDuplicate(SArray* pArray, __compar_fn_t comparFn, void (*fp)
 
         taosArraySet(pArray, pos + 1, p2);
         memset(TARRAY_GET_ELEM(pArray, i), 0, pArray->elemSize);
-	pos += 1;
-      } else {
         pos += 1;
-      }
-    }
-  }
-
-  if (fp != NULL) {
-    for (int32_t i = pos + 1; i < pArray->size; ++i) {
-      void* p = taosArrayGet(pArray, i);
-      fp(p);
-    }
-  }
-
-  pArray->size = pos + 1;
-}
-
-void taosArrayRemoveDuplicateP(SArray* pArray, __compar_fn_t comparFn, void (*fp)(void*)) {
-  size_t size = pArray->size;
-  if (size <= 1) {
-    return;
-  }
-
-  int32_t pos = 0;
-  for (int32_t i = 1; i < size; ++i) {
-    char* p1 = taosArrayGet(pArray, pos);
-    char* p2 = taosArrayGet(pArray, i);
-
-    if (comparFn(p1, p2) == 0) {
-      // do nothing
-    } else {
-      if (pos + 1 != i) {
-        void* p = taosArrayGetP(pArray, pos + 1);
-        if (fp != NULL) {
-          fp(p);
-        }
-
-        taosArraySet(pArray, pos + 1, p2);
-        memset(TARRAY_GET_ELEM(pArray, i), 0, pArray->elemSize);
-	pos += 1;
       } else {
         pos += 1;
       }
@@ -188,7 +149,7 @@ void taosArrayRemoveDuplicateP(SArray* pArray, __compar_fn_t comparFn, void (*fp
 
   if (fp != NULL) {
     for (int32_t i = pos + 1; i < pArray->size; ++i) {
-      void* p = taosArrayGetP(pArray, i);
+      void* p = taosArrayGet(pArray, i);
       fp(p);
     }
   }
@@ -392,20 +353,6 @@ void taosArrayClearEx(SArray* pArray, void (*fp)(void*)) {
   pArray->size = 0;
 }
 
-void taosArrayClearP(SArray* pArray, FDelete fp) {
-  if (pArray == NULL) return;
-  if (fp == NULL) {
-    pArray->size = 0;
-    return;
-  }
-
-  for (int32_t i = 0; i < pArray->size; ++i) {
-    fp(*(void**)TARRAY_GET_ELEM(pArray, i));
-  }
-
-  pArray->size = 0;
-}
-
 void* taosArrayDestroy(SArray* pArray) {
   if (pArray) {
     taosMemoryFree(pArray->pData);
@@ -495,6 +442,7 @@ static void taosArrayInsertSort(SArray* pArray, __ext_compar_fn_t fn, const void
   if (pArray->size <= 1) {
     return;
   }
+
   for (int32_t i = 1; i <= pArray->size - 1; ++i) {
     for (int32_t j = i; j > 0; --j) {
       if (fn(taosArrayGetP(pArray, j), taosArrayGetP(pArray, j - 1), param) == -1) {
@@ -507,7 +455,6 @@ static void taosArrayInsertSort(SArray* pArray, __ext_compar_fn_t fn, const void
       }
     }
   }
-  return;
 }
 
 int32_t taosEncodeArray(void** buf, const SArray* pArray, FEncode encode) {
@@ -539,21 +486,3 @@ void taosArraySortPWithExt(SArray* pArray, __ext_compar_fn_t fn, const void* par
   taosArrayGetSize(pArray) > 8 ? taosArrayQuickSort(pArray, fn, param) : taosArrayInsertSort(pArray, fn, param);
 }
 
-void taosArraySwap(SArray* a, SArray* b) {
-  if (a == NULL || b == NULL) return;
-  size_t t = a->size;
-  a->size = b->size;
-  b->size = t;
-
-  uint32_t cap = a->capacity;
-  a->capacity = b->capacity;
-  b->capacity = cap;
-
-  uint32_t elem = a->elemSize;
-  a->elemSize = b->elemSize;
-  b->elemSize = elem;
-
-  void* data = a->pData;
-  a->pData = b->pData;
-  b->pData = data;
-}