diff --git a/src/client/src/tscAsync.c b/src/client/src/tscAsync.c
index 4e05e1ce4c7fea9719e6249bd4b8ed48e5dce4d4..cae67673e91f2e7625a641b78b22c2de9eff557d 100644
--- a/src/client/src/tscAsync.c
+++ b/src/client/src/tscAsync.c
@@ -198,6 +198,10 @@ void taos_fetch_rows_a(TAOS_RES *taosa, void (*fp)(void *, TAOS_RES *, int), voi
   SSqlRes *pRes = &pSql->res;
   SSqlCmd *pCmd = &pSql->cmd;
 
+  // user-defined callback function is stored in fetchFp
+  pSql->fetchFp = fp;
+  pSql->fp = tscAsyncFetchRowsProxy;
+
   if (pRes->qhandle == 0) {
     tscError("qhandle is NULL");
     pRes->code = TSDB_CODE_TSC_INVALID_QHANDLE;
@@ -205,10 +209,6 @@ void taos_fetch_rows_a(TAOS_RES *taosa, void (*fp)(void *, TAOS_RES *, int), voi
     return;
   }
 
-  // user-defined callback function is stored in fetchFp
-  pSql->fetchFp = fp;
-  pSql->fp = tscAsyncFetchRowsProxy;
-
   pSql->param = param;
   tscResetForNextRetrieve(pRes);
   
diff --git a/src/mnode/src/mnodeProfile.c b/src/mnode/src/mnodeProfile.c
index af4a09a45a1fc314a648ec528cb4caaf9860df7a..9121f31131bc0cafa85830409bf9d40390da6790 100644
--- a/src/mnode/src/mnodeProfile.c
+++ b/src/mnode/src/mnodeProfile.c
@@ -115,7 +115,7 @@ SConnObj *mnodeAccquireConn(int32_t connId, char *user, uint32_t ip, uint16_t po
   uint64_t expireTime = CONN_KEEP_TIME * 1000 + (uint64_t)taosGetTimestampMs();
   SConnObj *pConn = taosCacheUpdateExpireTimeByName(tsMnodeConnCache, &connId, sizeof(int32_t), expireTime);
   if (pConn == NULL) {
-    mError("connId:%d, is already destroyed, user:%s ip:%s:%u", connId, user, taosIpStr(ip), port);
+    mDebug("connId:%d, is already destroyed, user:%s ip:%s:%u", connId, user, taosIpStr(ip), port);
     return NULL;
   }
 
diff --git a/src/plugins/http/src/httpContext.c b/src/plugins/http/src/httpContext.c
index 98fba9cb3b3f39a70fd102721a022ad923e0e43c..cefcca78215da2267001099aa7f728527f481ffa 100644
--- a/src/plugins/http/src/httpContext.c
+++ b/src/plugins/http/src/httpContext.c
@@ -137,7 +137,7 @@ void httpReleaseContext(HttpContext *pContext) {
   assert(refCount >= 0);
 
   HttpContext **ppContext = pContext->ppContext;
-  httpDebug("context:%p, is releasd, data:%p refCount:%d", pContext, ppContext, refCount);
+  httpDebug("context:%p, is released, data:%p refCount:%d", pContext, ppContext, refCount);
 
   if (tsHttpServer.contextCache != NULL) {
     taosCacheRelease(tsHttpServer.contextCache, (void **)(&ppContext), false);
diff --git a/src/plugins/http/src/httpSql.c b/src/plugins/http/src/httpSql.c
index 7a515d124ebee78cb7d574a9f340d4e3f62d7cc2..d8ac170d6d749ae2bf6ed313081cb2a98ca09d2a 100644
--- a/src/plugins/http/src/httpSql.c
+++ b/src/plugins/http/src/httpSql.c
@@ -47,6 +47,10 @@ void httpProcessMultiSqlRetrieveCallBack(void *param, TAOS_RES *result, int numO
     }
   }
 
+  if (tscResultsetFetchCompleted(result)) {
+    isContinue = false;
+  }
+
   if (isContinue) {
     // retrieve next batch of rows
     httpDebug("context:%p, fd:%d, ip:%s, user:%s, process pos:%d, continue retrieve, numOfRows:%d, sql:%s",
@@ -75,7 +79,8 @@ void httpProcessMultiSqlCallBack(void *param, TAOS_RES *result, int code) {
   HttpContext *pContext = (HttpContext *)param;
   if (pContext == NULL) return;
 
-  HttpSqlCmds *     multiCmds = pContext->multiCmds;
+  code = taos_errno(result);  
+  HttpSqlCmds *multiCmds = pContext->multiCmds;
   HttpEncodeMethod *encode = pContext->encodeMethod;
 
   HttpSqlCmd *singleCmd = multiCmds->cmds + multiCmds->pos;
@@ -109,8 +114,8 @@ void httpProcessMultiSqlCallBack(void *param, TAOS_RES *result, int code) {
     return;
   }
 
-  int num_fields = taos_field_count(result);
-  if (num_fields == 0) {
+  bool isUpdate = tscIsUpdateQuery(result);
+  if (isUpdate) {
     // not select or show commands
     int affectRows = taos_affected_rows(result);
     httpDebug("context:%p, fd:%d, ip:%s, user:%s, process pos:%d, affect rows:%d, sql:%s",
@@ -221,9 +226,9 @@ void httpProcessSingleSqlRetrieveCallBack(void *param, TAOS_RES *result, int num
     if (numOfRows < 0) {
       httpError("context:%p, fd:%d, ip:%s, user:%s, retrieve failed, code:%s", pContext, pContext->fd, pContext->ipstr,
                 pContext->user, tstrerror(numOfRows));
-    } 
-    
-    taos_free_result(result);    
+    }
+
+    taos_free_result(result);
 
     if (encode->stopJsonFp) {
       (encode->stopJsonFp)(pContext, &pContext->singleCmd);
@@ -238,6 +243,11 @@ void httpProcessSingleSqlCallBack(void *param, TAOS_RES *result, int unUsedCode)
   if (pContext == NULL) return;
 
   int32_t code = taos_errno(result);
+  if (code != unUsedCode) {
+    httpError("context:%p, fd:%d, ip:%s, user:%s, resultset code:%s input code:%s not matched, sqlObj:%p", pContext,
+              pContext->fd, pContext->ipstr, pContext->user, tstrerror(code), tstrerror(unUsedCode), (SSqlObj *)result);
+  }
+
   HttpEncodeMethod *encode = pContext->encodeMethod;
 
   if (code == TSDB_CODE_TSC_ACTION_IN_PROGRESS) {
diff --git a/src/query/src/qExecutor.c b/src/query/src/qExecutor.c
index 37defc3ccf4b961c090c69c5f0785927a18160bc..f94c65834dd0c4154f5f2274163df7c878f9a7ac 100644
--- a/src/query/src/qExecutor.c
+++ b/src/query/src/qExecutor.c
@@ -6333,6 +6333,7 @@ int32_t qKillQuery(qinfo_t qinfo) {
     return TSDB_CODE_QRY_INVALID_QHANDLE;
   }
 
+  sem_post(&pQInfo->dataReady);
   setQueryKilled(pQInfo);
   return TSDB_CODE_SUCCESS;
 }
@@ -6545,13 +6546,14 @@ void** qRegisterQInfo(void* pMgmt, uint64_t qInfo) {
 
   SQueryMgmt *pQueryMgmt = pMgmt;
   if (pQueryMgmt->qinfoPool == NULL) {
+    qError("QInfo:%p failed to add qhandle into qMgmt, since qMgmt is closed", (void *)qInfo);
     return NULL;
   }
 
   pthread_mutex_lock(&pQueryMgmt->lock);
   if (pQueryMgmt->closed) {
     pthread_mutex_unlock(&pQueryMgmt->lock);
-
+    qError("QInfo:%p failed to add qhandle into cache, since qMgmt is colsing", (void *)qInfo);
     return NULL;
   } else {
     uint64_t handleVal = (uint64_t) qInfo;
diff --git a/src/util/src/tcache.c b/src/util/src/tcache.c
index df63d567c795c69b031c6ab97112a1b51d0c2e94..072e9939de3c672a80cebe93b2075a347991411a 100644
--- a/src/util/src/tcache.c
+++ b/src/util/src/tcache.c
@@ -294,7 +294,7 @@ void *taosCachePut(SCacheObj *pCacheObj, const void *key, size_t keyLen, const v
     }
   } else {  // old data exists, update the node
     pNode = taosUpdateCacheImpl(pCacheObj, pOld, key, keyLen, pData, dataSize, duration * 1000L);
-    uDebug("cache:%s, key:%p, %p exist in cache, updated", pCacheObj->name, key, pNode->data);
+    uDebug("cache:%s, key:%p, %p exist in cache, updated old:%p", pCacheObj->name, key, pNode->data, pOld);
   }
 
   __cache_unlock(pCacheObj);
@@ -307,26 +307,30 @@ void *taosCacheAcquireByKey(SCacheObj *pCacheObj, const void *key, size_t keyLen
     return NULL;
   }
 
+  void *pData = NULL;
+
   __cache_rd_lock(pCacheObj);
-  
+
   SCacheDataNode **ptNode = (SCacheDataNode **)taosHashGet(pCacheObj->pHashTable, key, keyLen);
 
   int32_t ref = 0;
   if (ptNode != NULL) {
     ref = T_REF_INC(*ptNode);
+    pData = (*ptNode)->data;
   }
+
   __cache_unlock(pCacheObj);
-  
-  if (ptNode != NULL) {
+
+  if (pData != NULL) {
     atomic_add_fetch_32(&pCacheObj->statistics.hitCount, 1);
-    uDebug("cache:%s, key:%p, %p is retrieved from cache, refcnt:%d", pCacheObj->name, key, (*ptNode)->data, ref);
+    uDebug("cache:%s, key:%p, %p is retrieved from cache, refcnt:%d", pCacheObj->name, key, pData, ref);
   } else {
     atomic_add_fetch_32(&pCacheObj->statistics.missCount, 1);
     uDebug("cache:%s, key:%p, not in cache, retrieved failed", pCacheObj->name, key);
   }
-  
+
   atomic_add_fetch_32(&pCacheObj->statistics.totalAccess, 1);
-  return (ptNode != NULL) ? (*ptNode)->data : NULL;
+  return pData;
 }
 
 void* taosCacheUpdateExpireTimeByName(SCacheObj *pCacheObj, void *key, size_t keyLen, uint64_t expireTime) {
@@ -453,21 +457,20 @@ void taosCacheRelease(SCacheObj *pCacheObj, void **data, bool _remove) {
   } else {
     uDebug("cache:%s, key:%p, %p is released, refcnt:%d", pCacheObj->name, pNode->key, pNode->data, T_REF_VAL_GET(pNode) - 1);
 
+    __cache_wr_lock(pCacheObj);
+
     // NOTE: once refcount is decrease, pNode may be freed by other thread immediately.
     int32_t ref = T_REF_DEC(pNode);
 
-    if (inTrashCan) {
+    if (inTrashCan && (ref == 0)) {
       // Remove it if the ref count is 0.
       // The ref count does not need to load and check again after lock acquired, since ref count can not be increased when
       // the node is in trashcan.
-      if (ref == 0) {
-        __cache_wr_lock(pCacheObj);
-        assert(pNode->pTNodeHeader->pData == pNode);
-        taosRemoveFromTrashCan(pCacheObj, pNode->pTNodeHeader);
-        __cache_unlock(pCacheObj);
-      }
-
+      assert(pNode->pTNodeHeader->pData == pNode);
+      taosRemoveFromTrashCan(pCacheObj, pNode->pTNodeHeader);
     }
+
+    __cache_unlock(pCacheObj);
   }
 
 //   else {
diff --git a/src/vnode/src/vnodeRead.c b/src/vnode/src/vnodeRead.c
index 987783711b2452b17c56568fe4c63ed506c51e30..f529b713cf659d923e64ba8bf49798a0dde0f195 100644
--- a/src/vnode/src/vnodeRead.c
+++ b/src/vnode/src/vnodeRead.c
@@ -108,9 +108,10 @@ static int32_t vnodeProcessQueryMsg(SVnodeObj *pVnode, SReadMsg *pReadMsg) {
     if (code == TSDB_CODE_SUCCESS) {
       handle = qRegisterQInfo(pVnode->qMgmt, (uint64_t) pQInfo);
       if (handle == NULL) {  // failed to register qhandle
+        vError("vgId:%d QInfo:%p register qhandle failed, return to app, code:%s", pVnode->vgId, (void *)pQInfo,
+               tstrerror(pRsp->code));
         pRsp->code = TSDB_CODE_QRY_INVALID_QHANDLE;
         qDestroyQueryInfo(pQInfo);  // destroy it directly
-        vError("vgId:%d QInfo:%p register qhandle failed, return to app, code:%s", pVnode->vgId, (void*) pQInfo, tstrerror(pRsp->code));
       } else {
         assert(*handle == pQInfo);
         pRsp->qhandle = htobe64((uint64_t) pQInfo);