diff --git a/include/libs/scheduler/scheduler.h b/include/libs/scheduler/scheduler.h
index 62a97d1be0ed83c9fe52429f6e5a00a19f4185ca..a72489f338908e8396776b5fba85d8738005b6b7 100644
--- a/include/libs/scheduler/scheduler.h
+++ b/include/libs/scheduler/scheduler.h
@@ -54,8 +54,6 @@ typedef struct SQueryProfileSummary {
 typedef struct SQueryResult {
   int32_t         code;
   uint64_t        numOfRows;
-  int32_t         msgSize;
-  char           *msg;
   void           *res;
 } SQueryResult;
 
@@ -64,7 +62,8 @@ typedef struct STaskInfo {
   SSubQueryMsg  *msg;
 } STaskInfo;
 
-typedef void (*schedulerCallback)(SQueryResult* pResult, void* param, int32_t code);
+typedef void (*schedulerExecCallback)(SQueryResult* pResult, void* param, int32_t code);
+typedef void (*schedulerFetchCallback)(void* pResult, void* param, int32_t code);
 
 
 int32_t schedulerInit(SSchedulerCfg *cfg);
@@ -83,7 +82,8 @@ int32_t schedulerExecJob(void *transport, SArray *nodeList, SQueryPlan *pDag, in
  * @param pNodeList  Qnode/Vnode address list, element is SQueryNodeAddr
  * @return
  */
-int32_t schedulerAsyncExecJob(void *transport, SArray *pNodeList, SQueryPlan* pDag, const char* sql, int64_t *pJob);
+  int32_t schedulerAsyncExecJob(void *pTrans, SArray *pNodeList, SQueryPlan *pDag, int64_t *pJob, const char *sql,
+                           int64_t startTs, schedulerExecCallback fp, void* param);
 
 /**
  * Fetch query result from the remote query executor
@@ -93,6 +93,8 @@ int32_t schedulerAsyncExecJob(void *transport, SArray *pNodeList, SQueryPlan* pD
  */
 int32_t schedulerFetchRows(int64_t job, void **data);
 
+int32_t schedulerAsyncFetchRows(int64_t job, schedulerFetchCallback fp, void* param);
+
 int32_t schedulerGetTasksStatus(int64_t job, SArray *pSub);
 
 
diff --git a/source/client/src/clientImpl.c b/source/client/src/clientImpl.c
index b1428858418a499a0260376eb4b1b6af60c06ea7..131a3d577006241e3fc21d2fdfc8afc852bb4345 100644
--- a/source/client/src/clientImpl.c
+++ b/source/client/src/clientImpl.c
@@ -292,7 +292,7 @@ void setResPrecision(SReqResultInfo* pResInfo, int32_t precision) {
 int32_t scheduleQuery(SRequestObj* pRequest, SQueryPlan* pDag, SArray* pNodeList, void** pRes) {
   void* pTransporter = pRequest->pTscObj->pAppInfo->pTransporter;
 
-  SQueryResult res = {.code = 0, .numOfRows = 0, .msgSize = ERROR_MSG_BUF_DEFAULT_SIZE, .msg = pRequest->msgBuf};
+  SQueryResult res = {.code = 0, .numOfRows = 0};
   int32_t      code = schedulerExecJob(pTransporter, pNodeList, pDag, &pRequest->body.queryJob, pRequest->sqlstr,
                                        pRequest->metric.start, &res);
   if (code != TSDB_CODE_SUCCESS) {
diff --git a/source/libs/scheduler/inc/schedulerInt.h b/source/libs/scheduler/inc/schedulerInt.h
index d2ddd8b6959a7809ff47757d0bd3a8549422bc8d..6599d00f58d530595435618e9409344970ee531a 100644
--- a/source/libs/scheduler/inc/schedulerInt.h
+++ b/source/libs/scheduler/inc/schedulerInt.h
@@ -39,6 +39,11 @@ enum {
   SCH_WRITE,
 };
 
+enum {
+  SCH_EXEC_CB = 1,
+  SCH_FETCH_CB,
+};
+
 typedef struct SSchTrans {
   void *pTrans;
   void *pHandle;
@@ -81,9 +86,11 @@ typedef struct SSchStat {
 } SSchStat;
 
 typedef struct SSchResInfo {
-  SQueryResult queryRes;
-  schedulerCallback userFp; 
-  void* userParam;
+  SQueryResult*          queryRes;
+  void**                 fetchRes;
+  schedulerExecCallback  execFp; 
+  schedulerFetchCallback fetchFp; 
+  void*                  userParam;
 } SSchResInfo;
 
 typedef struct SSchedulerMgmt {
@@ -113,7 +120,7 @@ typedef struct SSchTaskCallbackParam {
 typedef struct SSchHbCallbackParam {
   SSchCallbackParamHeader head;
   SQueryNodeEpId          nodeEpId;
-  void                   *transport;
+  void                   *pTrans;
 } SSchHbCallbackParam;
 
 typedef struct SSchFlowControl {
@@ -196,13 +203,13 @@ typedef struct SSchJob {
   int32_t          remoteFetch;
   SSchTask        *fetchTask;
   int32_t          errCode;
-  SArray          *errList;    // SArray<SQueryErrorInfo>
   SRWLatch         resLock;
   void            *queryRes;
   void            *resData;         //TODO free it or not
   int32_t          resNumOfRows;
   SSchResInfo      userRes;
   const char      *sql;
+  int32_t          userCb;
   SQueryProfileSummary summary;
 } SSchJob;
 
@@ -298,15 +305,21 @@ int32_t schUpdateTaskExecNodeHandle(SSchTask *pTask, void *handle, int32_t rspCo
 void schFreeRpcCtxVal(const void *arg);
 int32_t schMakeBrokenLinkVal(SSchJob *pJob, SSchTask *pTask, SRpcBrokenlinkVal *brokenVal, bool isHb);
 int32_t schRecordTaskExecNode(SSchJob *pJob, SSchTask *pTask, SQueryNodeAddr *addr, void *handle);
-int32_t schExecStaticExplainJob(void *transport, SArray *pNodeList, SQueryPlan *pDag, int64_t *job, const char *sql,
-                             bool syncSchedule);
-int32_t schExecJobImpl(void *transport, SArray *pNodeList, SQueryPlan *pDag, int64_t *job, const char *sql,
-                              int64_t startTs, bool sync);
+int32_t schExecStaticExplainJob(void *pTrans, SArray *pNodeList, SQueryPlan *pDag, int64_t *job, const char *sql,
+                             SSchResInfo *pRes, bool sync);
+int32_t schExecJobImpl(void *pTrans, SArray *pNodeList, SQueryPlan *pDag, int64_t *job, const char *sql,
+                              SSchResInfo *pRes, int64_t startTs, bool sync);
 int32_t schChkUpdateJobStatus(SSchJob *pJob, int8_t newStatus);
 int32_t schCancelJob(SSchJob *pJob);
 int32_t schProcessOnJobDropped(SSchJob *pJob, int32_t errCode);
 uint64_t schGenTaskId(void);
 void schCloseJobRef(void);
+int32_t schExecJob(void *pTrans, SArray *pNodeList, SQueryPlan *pDag, int64_t *pJob, const char *sql,
+                         int64_t startTs, SSchResInfo *pRes);
+int32_t schAsyncExecJob(void *pTrans, SArray *pNodeList, SQueryPlan *pDag, int64_t *pJob, const char *sql,
+                                int64_t startTs, SSchResInfo *pRes);
+int32_t schFetchRows(SSchJob *pJob);
+int32_t schAsyncFetchRows(SSchJob *pJob);
 
 
 #ifdef __cplusplus
diff --git a/source/libs/scheduler/src/schJob.c b/source/libs/scheduler/src/schJob.c
index a211d90a3713c3a2dcbd2a4c80da37b393ba50b9..52722d819f9b517a468befb76ed9326ce7d0378f 100644
--- a/source/libs/scheduler/src/schJob.c
+++ b/source/libs/scheduler/src/schJob.c
@@ -53,7 +53,7 @@ int32_t schInitJob(SSchJob **pSchJob, SQueryPlan *pDag, void *pTrans, SArray *pN
   pJob->attr.syncSchedule = syncSchedule;
   pJob->pTrans = pTrans;
   pJob->sql = sql;
-  pJob->userRes = pRes;
+  pJob->userRes = *pRes;
 
   if (pNodeList != NULL) {
     pJob->nodeList = taosArrayDup(pNodeList);
@@ -459,6 +459,7 @@ int32_t schValidateAndBuildJob(SQueryPlan *pDag, SSchJob *pJob) {
   SCH_ERR_JRET(schBuildTaskRalation(pJob, planToTask));
 
 _return:
+  
   if (planToTask) {
     taosHashCleanup(planToTask);
   }
@@ -728,6 +729,69 @@ _return:
   SCH_JOB_DLOG("job errCode updated to %x - %s", errCode, tstrerror(errCode));
 }
 
+
+int32_t schSetJobQueryRes(SSchJob* pJob, SQueryResult* pRes) {
+  pRes->code = atomic_load_32(&pJob->errCode);
+  pRes->numOfRows = pJob->resNumOfRows;
+  pRes->res = pJob->queryRes;
+  pJob->queryRes = NULL;
+
+  return TSDB_CODE_SUCCESS;
+}
+
+int32_t schSetJobFetchRes(SSchJob* pJob, void** pData) {
+  int32_t code = 0;
+  if (pJob->resData && ((SRetrieveTableRsp *)pJob->resData)->completed) {
+    SCH_ERR_RET(schChkUpdateJobStatus(pJob, JOB_TASK_STATUS_SUCCEED));
+  }
+
+  while (true) {
+    *pData = atomic_load_ptr(&pJob->resData);
+    if (*pData != atomic_val_compare_exchange_ptr(&pJob->resData, *pData, NULL)) {
+      continue;
+    }
+
+    break;
+  }
+
+  if (NULL == *pData) {
+    SRetrieveTableRsp *rsp = (SRetrieveTableRsp *)taosMemoryCalloc(1, sizeof(SRetrieveTableRsp));
+    if (rsp) {
+      rsp->completed = 1;
+    }
+
+    *pData = rsp;
+    SCH_JOB_DLOG("empty res and set query complete, code:%x", code);
+  }
+
+  SCH_JOB_DLOG("fetch done, totalRows:%d", pJob->resNumOfRows);
+
+  return TSDB_CODE_SUCCESS;
+}
+
+int32_t schNotifyUserQueryRes(SSchJob* pJob) {
+  pJob->userRes.queryRes = taosMemoryCalloc(1, sizeof(*pJob->userRes.queryRes));
+  if (pJob->userRes.queryRes) {
+    schSetJobQueryRes(pJob, pJob->userRes.queryRes);
+  }
+
+  (*pJob->userRes.execFp)(pJob->userRes.queryRes, pJob->userRes.userParam, atomic_load_32(&pJob->errCode));
+
+  pJob->userRes.queryRes = NULL;
+
+  return TSDB_CODE_SUCCESS;
+}
+
+int32_t schNotifyUserFetchRes(SSchJob* pJob) {
+  void* pRes = NULL;
+  
+  SCH_ERR_RET(schSetJobFetchRes(pJob, &pRes));
+
+  (*pJob->userRes.fetchFp)(pRes, pJob->userRes.userParam, atomic_load_32(&pJob->errCode));
+
+  return TSDB_CODE_SUCCESS;
+}
+
 int32_t schProcessOnJobFailureImpl(SSchJob *pJob, int32_t status, int32_t errCode) {
   // if already FAILED, no more processing
   SCH_ERR_RET(schChkUpdateJobStatus(pJob, status));
@@ -742,6 +806,14 @@ int32_t schProcessOnJobFailureImpl(SSchJob *pJob, int32_t status, int32_t errCod
 
   SCH_JOB_DLOG("job failed with error: %s", tstrerror(code));
 
+  if (!pJob->attr.syncSchedule) {
+    if (SCH_EXEC_CB == atomic_val_compare_exchange_32(&pJob->userCb, SCH_EXEC_CB, 0)) {
+      schNotifyUserQueryRes(pJob);
+    } else if (SCH_FETCH_CB == atomic_val_compare_exchange_32(&pJob->userCb, SCH_FETCH_CB, 0)) {
+      schNotifyUserFetchRes(pJob);
+    }
+  }
+
   SCH_RET(code);
 }
 
@@ -763,6 +835,10 @@ int32_t schProcessOnJobPartialSuccess(SSchJob *pJob) {
 
   if (pJob->attr.syncSchedule) {
     tsem_post(&pJob->rspSem);
+  } else if (SCH_EXEC_CB == atomic_val_compare_exchange_32(&pJob->userCb, SCH_EXEC_CB, 0)) {
+    schNotifyUserQueryRes(pJob);
+  } else if (SCH_FETCH_CB == atomic_val_compare_exchange_32(&pJob->userCb, SCH_FETCH_CB, 0)) {
+    schNotifyUserFetchRes(pJob);
   }
 
   if (atomic_load_8(&pJob->userFetch)) {
@@ -1219,6 +1295,7 @@ void schFreeJobImpl(void *job) {
     tFreeSSubmitRsp((SSubmitRsp*)pJob->queryRes);
   }
 
+  taosMemoryFreeClear(pJob->userRes.queryRes);
   taosMemoryFreeClear(pJob->resData);
   taosMemoryFreeClear(pJob);
 
@@ -1239,52 +1316,61 @@ int32_t schExecJobImpl(void *pTrans, SArray *pNodeList, SQueryPlan *pDag, int64_
 
   int32_t  code = 0;
   SSchJob *pJob = NULL;
-  SCH_ERR_JRET(schInitJob(&pJob, pDag, pTrans, pNodeList, sql, pRes, startTs, sync));
-
-  SCH_ERR_JRET(schLaunchJob(pJob));
+  SCH_ERR_RET(schInitJob(&pJob, pDag, pTrans, pNodeList, sql, pRes, startTs, sync));
 
   *job = pJob->refId;
 
+  SCH_ERR_JRET(schLaunchJob(pJob));
+
   if (sync) {
     SCH_JOB_DLOG("will wait for rsp now, job status:%s", SCH_GET_JOB_STATUS_STR(pJob));
     tsem_wait(&pJob->rspSem);
+  } else {
+    pJob->userCb = SCH_EXEC_CB; 
   }
 
   SCH_JOB_DLOG("job exec done, job status:%s", SCH_GET_JOB_STATUS_STR(pJob));
 
-  schReleaseJob(pJob->refId);
-
-  return TSDB_CODE_SUCCESS;
-
 _return:
 
-  schFreeJobImpl(pJob);
+  schReleaseJob(pJob->refId);
+  
   SCH_RET(code);
 }
 
 int32_t schExecJob(void *pTrans, SArray *pNodeList, SQueryPlan *pDag, int64_t *pJob, const char *sql,
-                         int64_t startTs, SSchResInfo *pRes, bool sync) {
+                         int64_t startTs, SSchResInfo *pRes) {
   int32_t code = 0;
   
   *pJob = 0;
   
   if (EXPLAIN_MODE_STATIC == pDag->explainInfo.mode) {
-    SCH_ERR_RET(schExecStaticExplainJob(pTrans, pNodeList, pDag, pJob, sql, pRes, sync));
+    SCH_ERR_JRET(schExecStaticExplainJob(pTrans, pNodeList, pDag, pJob, sql, NULL, true));
   } else {
-    SCH_ERR_JRET(schExecJobImpl(pTrans, pNodeList, pDag, pJob, sql, pRes, startTs, sync));
+    SCH_ERR_JRET(schExecJobImpl(pTrans, pNodeList, pDag, pJob, sql, NULL, startTs, true));
   }
 
 _return:
 
   if (*pJob) {
     SSchJob *job = schAcquireJob(*pJob);
+    schSetJobQueryRes(job, pRes->queryRes);
+    schReleaseJob(*pJob);
+  }
 
-    pRes->code = atomic_load_32(&job->errCode);
-    pRes->numOfRows = job->resNumOfRows;
-    pRes->res = job->queryRes;
-    job->queryRes = NULL;
+  return code;
+}
 
-    schReleaseJob(*pJob);
+int32_t schAsyncExecJob(void *pTrans, SArray *pNodeList, SQueryPlan *pDag, int64_t *pJob, const char *sql,
+                                int64_t startTs, SSchResInfo *pRes) {
+  int32_t code = 0;
+
+  *pJob = 0;
+
+  if (EXPLAIN_MODE_STATIC == pDag->explainInfo.mode) {
+    SCH_ERR_RET(schExecStaticExplainJob(pTrans, pNodeList, pDag, pJob, sql, pRes, false));
+  } else {
+    SCH_ERR_RET(schExecJobImpl(pTrans, pNodeList, pDag, pJob, sql, pRes, startTs, false));
   }
 
   return code;
@@ -1303,10 +1389,11 @@ int32_t schExecStaticExplainJob(void *pTrans, SArray *pNodeList, SQueryPlan *pDa
 
   pJob->sql = sql;
   pJob->attr.queryJob = true;
+  pJob->attr.syncSchedule = sync;
   pJob->attr.explainMode = pDag->explainInfo.mode;
   pJob->queryId = pDag->queryId;
   pJob->subPlans = pDag->pSubplans;
-  pJob->userRes = pRes;
+  pJob->userRes = *pRes;
   
   SCH_ERR_JRET(qExecStaticExplain(pDag, (SRetrieveTableRsp **)&pJob->resData));
 
@@ -1318,7 +1405,7 @@ int32_t schExecStaticExplainJob(void *pTrans, SArray *pNodeList, SQueryPlan *pDa
 
   if (NULL == schAcquireJob(refId)) {
     SCH_JOB_ELOG("schAcquireJob job failed, refId:%" PRIx64, refId);
-    SCH_RET(TSDB_CODE_SCH_STATUS_ERROR);
+    SCH_ERR_RET(TSDB_CODE_SCH_STATUS_ERROR);
   }
 
   pJob->refId = refId;
@@ -1326,12 +1413,17 @@ int32_t schExecStaticExplainJob(void *pTrans, SArray *pNodeList, SQueryPlan *pDa
   SCH_JOB_DLOG("job refId:%" PRIx64, pJob->refId);
 
   pJob->status = JOB_TASK_STATUS_PARTIAL_SUCCEED;
+  
   *job = pJob->refId;
   SCH_JOB_DLOG("job exec done, job status:%s", SCH_GET_JOB_STATUS_STR(pJob));
 
+  if (!pJob->attr.syncSchedule) {
+    code = schNotifyUserQueryRes(pJob);
+  }
+
   schReleaseJob(pJob->refId);
 
-  return TSDB_CODE_SUCCESS;
+  SCH_RET(code);
 
 _return:
 
@@ -1339,4 +1431,103 @@ _return:
   SCH_RET(code);
 }
 
+int32_t schFetchRows(SSchJob *pJob) {
+  int32_t  code = 0;
+
+  int8_t status = SCH_GET_JOB_STATUS(pJob);
+  if (status == JOB_TASK_STATUS_DROPPING) {
+    SCH_JOB_ELOG("job is dropping, status:%s", jobTaskStatusStr(status));
+    SCH_ERR_RET(TSDB_CODE_SCH_STATUS_ERROR);
+  }
+
+  if (!SCH_JOB_NEED_FETCH(pJob)) {
+    SCH_JOB_ELOG("no need to fetch data, status:%s", SCH_GET_JOB_STATUS_STR(pJob));
+    SCH_ERR_RET(TSDB_CODE_QRY_APP_ERROR);
+  }
+
+  if (atomic_val_compare_exchange_8(&pJob->userFetch, 0, 1) != 0) {
+    SCH_JOB_ELOG("prior fetching not finished, userFetch:%d", atomic_load_8(&pJob->userFetch));
+    SCH_ERR_RET(TSDB_CODE_QRY_APP_ERROR);
+  }
+
+  if (JOB_TASK_STATUS_FAILED == status || JOB_TASK_STATUS_DROPPING == status) {
+    SCH_JOB_ELOG("job failed or dropping, status:%s", jobTaskStatusStr(status));
+    SCH_ERR_JRET(atomic_load_32(&pJob->errCode));
+  } else if (status == JOB_TASK_STATUS_SUCCEED) {
+    SCH_JOB_DLOG("job already succeed, status:%s", jobTaskStatusStr(status));
+    goto _return;
+  } else if (status != JOB_TASK_STATUS_PARTIAL_SUCCEED) {
+    SCH_JOB_ELOG("job status error for fetch, status:%s", jobTaskStatusStr(status));
+    SCH_ERR_JRET(TSDB_CODE_SCH_STATUS_ERROR);
+  }
+
+  if (!(pJob->attr.explainMode == EXPLAIN_MODE_STATIC)) {
+    SCH_ERR_JRET(schFetchFromRemote(pJob));
+    tsem_wait(&pJob->rspSem);
+  
+    status = SCH_GET_JOB_STATUS(pJob);      
+    if (JOB_TASK_STATUS_FAILED == status || JOB_TASK_STATUS_DROPPING == status) {
+      SCH_JOB_ELOG("job failed or dropping, status:%s", jobTaskStatusStr(status));
+      SCH_ERR_JRET(atomic_load_32(&pJob->errCode));
+    }
+  }
+
+  SCH_ERR_JRET(schSetJobFetchRes(pJob, pJob->userRes.fetchRes));
+
+_return:
+
+  atomic_val_compare_exchange_8(&pJob->userFetch, 1, 0);
+
+  SCH_RET(code);
+}
+
+int32_t schAsyncFetchRows(SSchJob *pJob) {
+  int32_t  code = 0;
+
+  int8_t status = SCH_GET_JOB_STATUS(pJob);
+  if (status == JOB_TASK_STATUS_DROPPING) {
+    SCH_JOB_ELOG("job is dropping, status:%s", jobTaskStatusStr(status));
+    SCH_ERR_RET(TSDB_CODE_SCH_STATUS_ERROR);
+  }
+
+  if (!SCH_JOB_NEED_FETCH(pJob)) {
+    SCH_JOB_ELOG("no need to fetch data, status:%s", SCH_GET_JOB_STATUS_STR(pJob));
+    SCH_ERR_RET(TSDB_CODE_QRY_APP_ERROR);
+  }
+
+  if (atomic_val_compare_exchange_8(&pJob->userFetch, 0, 1) != 0) {
+    SCH_JOB_ELOG("prior fetching not finished, userFetch:%d", atomic_load_8(&pJob->userFetch));
+    SCH_ERR_RET(TSDB_CODE_QRY_APP_ERROR);
+  }
+
+  if (JOB_TASK_STATUS_FAILED == status || JOB_TASK_STATUS_DROPPING == status) {
+    SCH_JOB_ELOG("job failed or dropping, status:%s", jobTaskStatusStr(status));
+    SCH_ERR_JRET(atomic_load_32(&pJob->errCode));
+  } else if (status == JOB_TASK_STATUS_SUCCEED) {
+    SCH_JOB_DLOG("job already succeed, status:%s", jobTaskStatusStr(status));
+    goto _return;
+  } else if (status != JOB_TASK_STATUS_PARTIAL_SUCCEED) {
+    SCH_JOB_ELOG("job status error for fetch, status:%s", jobTaskStatusStr(status));
+    SCH_ERR_JRET(TSDB_CODE_SCH_STATUS_ERROR);
+  }
+
+  if (pJob->attr.explainMode == EXPLAIN_MODE_STATIC) {
+    SCH_ERR_JRET(schNotifyUserFetchRes(pJob));
+    
+    atomic_val_compare_exchange_8(&pJob->userFetch, 1, 0);
+  } else {
+    pJob->userCb = SCH_FETCH_CB;
+    
+    SCH_ERR_JRET(schFetchFromRemote(pJob));
+  }
+
+  return TSDB_CODE_SUCCESS;
+
+_return:
+
+  atomic_val_compare_exchange_8(&pJob->userFetch, 1, 0);
+
+  SCH_RET(code);
+}
+
 
diff --git a/source/libs/scheduler/src/schRemote.c b/source/libs/scheduler/src/schRemote.c
index 247358af8f45e71872035d37233ab3dbb872cdcf..33c04318cfabc19ae819c08a012e2eed253beae0 100644
--- a/source/libs/scheduler/src/schRemote.c
+++ b/source/libs/scheduler/src/schRemote.c
@@ -450,7 +450,7 @@ int32_t schHandleLinkBrokenCallback(void *param, const SDataBuf *pMsg, int32_t c
 
   if (head->isHbParam) {
     SSchHbCallbackParam *hbParam = (SSchHbCallbackParam *)param;
-    SSchTrans            trans = {.transInst = hbParam->transport, .transHandle = NULL};
+    SSchTrans            trans = {.pTrans = hbParam->pTrans, .pHandle = NULL};
     SCH_ERR_RET(schUpdateHbConnection(&hbParam->nodeEpId, &trans));
 
     SCH_ERR_RET(schBuildAndSendHbMsg(&hbParam->nodeEpId));
@@ -556,7 +556,7 @@ int32_t schMakeHbCallbackParam(SSchJob *pJob, SSchTask *pTask, void **pParam) {
 
   param->nodeEpId.nodeId = addr->nodeId;
   memcpy(&param->nodeEpId.ep, SCH_GET_CUR_EP(addr), sizeof(SEp));
-  param->transport = pJob->pTrans;
+  param->pTrans = pJob->pTrans;
 
   *pParam = param;
 
@@ -638,7 +638,7 @@ int32_t schMakeHbRpcCtx(SSchJob *pJob, SSchTask *pTask, SRpcCtx *pCtx) {
   SCH_ERR_JRET(schGetCallbackFp(TDMT_VND_QUERY_HEARTBEAT, &fp));
 
   param->nodeEpId = epId;
-  param->transport = pJob->pTrans;
+  param->pTrans = pJob->pTrans;
 
   pMsgSendInfo->param = param;
   pMsgSendInfo->fp = fp;
@@ -1208,7 +1208,7 @@ int32_t schBuildAndSendMsg(SSchJob *pJob, SSchTask *pTask, SQueryNodeAddr *addr,
 
   SCH_SET_TASK_LASTMSG_TYPE(pTask, msgType);
 
-  SSchTrans trans = {.transInst = pJob->pTrans, .transHandle = SCH_GET_TASK_HANDLE(pTask)};
+  SSchTrans trans = {.pTrans = pJob->pTrans, .pHandle = SCH_GET_TASK_HANDLE(pTask)};
   SCH_ERR_JRET(schAsyncSendMsg(pJob, pTask, &trans, &epSet, msgType, msg, msgSize, persistHandle,
                                (rpcCtx.args ? &rpcCtx : NULL)));
 
diff --git a/source/libs/scheduler/src/scheduler.c b/source/libs/scheduler/src/scheduler.c
index de802465c2b911c8766af189514979ceb046617d..8d802980ea2e9bdf16e6cfc7e22fe217d8791743 100644
--- a/source/libs/scheduler/src/scheduler.c
+++ b/source/libs/scheduler/src/scheduler.c
@@ -73,18 +73,18 @@ int32_t schedulerExecJob(void *pTrans, SArray *pNodeList, SQueryPlan *pDag, int6
     SCH_ERR_RET(TSDB_CODE_QRY_INVALID_INPUT);
   }
 
-  SSchResInfo resInfo = {.queryRes = *pRes};                      
-  SCH_RET(schExecJob(pTrans, pNodeList, pDag, pJob, sql, startTs, &resInfo, true));
+  SSchResInfo resInfo = {.queryRes = pRes};
+  SCH_RET(schExecJob(pTrans, pNodeList, pDag, pJob, sql, startTs, &resInfo));
 }
 
 int32_t schedulerAsyncExecJob(void *pTrans, SArray *pNodeList, SQueryPlan *pDag, int64_t *pJob, const char *sql,
-                         int64_t startTs, SQueryResult *pRes, schedulerCallback fp, void* param) {
-   if (NULL == pTrans || NULL == pDag || NULL == pDag->pSubplans || NULL == pJob || NULL == pRes || NULL == fp || NULL == param) {
+                         int64_t startTs, schedulerExecCallback fp, void* param) {
+   if (NULL == pTrans || NULL == pDag || NULL == pDag->pSubplans || NULL == pJob || NULL == fp || NULL == param) {
      SCH_ERR_RET(TSDB_CODE_QRY_INVALID_INPUT);
    }
    
-   SSchResInfo resInfo = {.queryRes = *pRes, .userFp = fp, .userParam = param};                      
-   SCH_RET(schExecJob(pTrans, pNodeList, pDag, pJob, sql, startTs, &resInfo, false));
+   SSchResInfo resInfo = {.execFp = fp, .userParam = param};                      
+   SCH_RET(schAsyncExecJob(pTrans, pNodeList, pDag, pJob, sql, startTs, &resInfo));
 }
 
 int32_t schedulerFetchRows(int64_t job, void **pData) {
@@ -99,76 +99,32 @@ int32_t schedulerFetchRows(int64_t job, void **pData) {
     SCH_ERR_RET(TSDB_CODE_SCH_STATUS_ERROR);
   }
 
-  int8_t status = SCH_GET_JOB_STATUS(pJob);
-  if (status == JOB_TASK_STATUS_DROPPING) {
-    SCH_JOB_ELOG("job is dropping, status:%s", jobTaskStatusStr(status));
-    schReleaseJob(job);
-    SCH_ERR_RET(TSDB_CODE_SCH_STATUS_ERROR);
-  }
-
-  if (!SCH_JOB_NEED_FETCH(pJob)) {
-    SCH_JOB_ELOG("no need to fetch data, status:%s", SCH_GET_JOB_STATUS_STR(pJob));
-    schReleaseJob(job);
-    SCH_ERR_RET(TSDB_CODE_QRY_APP_ERROR);
-  }
-
-  if (atomic_val_compare_exchange_8(&pJob->userFetch, 0, 1) != 0) {
-    SCH_JOB_ELOG("prior fetching not finished, userFetch:%d", atomic_load_8(&pJob->userFetch));
-    schReleaseJob(job);
-    SCH_ERR_RET(TSDB_CODE_QRY_APP_ERROR);
-  }
-
-  if (JOB_TASK_STATUS_FAILED == status || JOB_TASK_STATUS_DROPPING == status) {
-    SCH_JOB_ELOG("job failed or dropping, status:%s", jobTaskStatusStr(status));
-    SCH_ERR_JRET(atomic_load_32(&pJob->errCode));
-  } else if (status == JOB_TASK_STATUS_SUCCEED) {
-    SCH_JOB_DLOG("job already succeed, status:%s", jobTaskStatusStr(status));
-    goto _return;
-  } else if (status == JOB_TASK_STATUS_PARTIAL_SUCCEED) {
-    if (!(pJob->attr.explainMode == EXPLAIN_MODE_STATIC)) {
-      SCH_ERR_JRET(schFetchFromRemote(pJob));
-      tsem_wait(&pJob->rspSem);
-    }
-  } else {
-    SCH_JOB_ELOG("job status error for fetch, status:%s", jobTaskStatusStr(status));
-    SCH_ERR_JRET(TSDB_CODE_SCH_STATUS_ERROR);
-  }
-
-  status = SCH_GET_JOB_STATUS(pJob);
+  pJob->attr.syncSchedule = true;
+  pJob->userRes.fetchRes = pData;
+  code = schFetchRows(pJob);
 
-  if (JOB_TASK_STATUS_FAILED == status || JOB_TASK_STATUS_DROPPING == status) {
-    SCH_JOB_ELOG("job failed or dropping, status:%s", jobTaskStatusStr(status));
-    SCH_ERR_JRET(atomic_load_32(&pJob->errCode));
-  }
-
-  if (pJob->resData && ((SRetrieveTableRsp *)pJob->resData)->completed) {
-    SCH_ERR_JRET(schChkUpdateJobStatus(pJob, JOB_TASK_STATUS_SUCCEED));
-  }
+  schReleaseJob(job);
 
-  while (true) {
-    *pData = atomic_load_ptr(&pJob->resData);
-    if (*pData != atomic_val_compare_exchange_ptr(&pJob->resData, *pData, NULL)) {
-      continue;
-    }
+  SCH_RET(code);
+}
 
-    break;
+int32_t schedulerAsyncFetchRows(int64_t job, schedulerFetchCallback fp, void* param) {
+  if (NULL == fp || NULL == param) {
+    SCH_ERR_RET(TSDB_CODE_QRY_INVALID_INPUT);
   }
 
-  if (NULL == *pData) {
-    SRetrieveTableRsp *rsp = (SRetrieveTableRsp *)taosMemoryCalloc(1, sizeof(SRetrieveTableRsp));
-    if (rsp) {
-      rsp->completed = 1;
-    }
-
-    *pData = rsp;
-    SCH_JOB_DLOG("empty res and set query complete, code:%x", code);
+  int32_t  code = 0;
+  SSchJob *pJob = schAcquireJob(job);
+  if (NULL == pJob) {
+    qError("acquire job from jobRef list failed, may be dropped, refId:%" PRIx64, job);
+    SCH_ERR_RET(TSDB_CODE_SCH_STATUS_ERROR);
   }
 
-  SCH_JOB_DLOG("fetch done, totalRows:%d, code:%s", pJob->resNumOfRows, tstrerror(code));
-
-_return:
-
-  atomic_val_compare_exchange_8(&pJob->userFetch, 1, 0);
+  pJob->attr.syncSchedule = false;
+  pJob->userRes.fetchFp = fp;
+  pJob->userRes.userParam = param;
+  
+  code = schFetchRows(pJob);
 
   schReleaseJob(job);
 
diff --git a/source/libs/scheduler/test/schedulerTests.cpp b/source/libs/scheduler/test/schedulerTests.cpp
index fc0e05aaf106fb11d8daa9be9a55e510aac58ff5..ec5d74372d2df681ce20c58a69dba22eaf7f8239 100644
--- a/source/libs/scheduler/test/schedulerTests.cpp
+++ b/source/libs/scheduler/test/schedulerTests.cpp
@@ -87,6 +87,11 @@ void schtInitLogFile() {
 
 }
 
+void schtQueryCb(SQueryResult* pResult, void* param, int32_t code) {
+  assert(TSDB_CODE_SUCCESS == code);
+  *(int32_t*)param = 1;
+}
+
 
 void schtBuildQueryDag(SQueryPlan *dag) {
   uint64_t qId = schtQueryId;
@@ -485,6 +490,7 @@ void* schtRunJobThread(void *aa) {
   SHashObj *execTasks = NULL;
   SDataBuf dataBuf = {0};
   uint32_t jobFinished = 0;
+  int32_t queryDone = 0;
 
   while (!schtTestStop) {
     schtBuildQueryDag(&dag);
@@ -496,7 +502,8 @@ void* schtRunJobThread(void *aa) {
     qnodeAddr.port = 6031;
     taosArrayPush(qnodeList, &qnodeAddr);
 
-    code = schedulerAsyncExecJob(mockPointer, qnodeList, &dag, "select * from tb", &queryJobRefId);
+    queryDone = 0;
+    code = schedulerAsyncExecJob(mockPointer, qnodeList, &dag, &queryJobRefId, "select * from tb", 0, schtQueryCb, &queryDone);
     assert(code == 0);
 
     pJob = schAcquireJob(queryJobRefId);
@@ -595,6 +602,14 @@ void* schtRunJobThread(void *aa) {
       pIter = taosHashIterate(execTasks, pIter);
     }  
 
+    while (true) {
+      if (queryDone) {
+        break;
+      }
+    
+      taosUsleep(10000);
+    }
+
     atomic_store_32(&schtStartFetch, 1);
 
     void *data = NULL;  
@@ -667,8 +682,9 @@ TEST(queryTest, normalCase) {
   schtSetPlanToString();
   schtSetExecNode();
   schtSetAsyncSendMsgToServer();
-  
-  code = schedulerAsyncExecJob(mockPointer, qnodeList, &dag, "select * from tb", &job);
+
+  int32_t queryDone = 0;
+  code = schedulerAsyncExecJob(mockPointer, qnodeList, &dag, &job, "select * from tb", 0, schtQueryCb, &queryDone);
   ASSERT_EQ(code, 0);
 
   
@@ -718,6 +734,14 @@ TEST(queryTest, normalCase) {
     pIter = taosHashIterate(pJob->execTasks, pIter);
   }  
 
+  while (true) {
+    if (queryDone) {
+      break;
+    }
+
+    taosUsleep(10000);
+  }
+  
   TdThreadAttr thattr;
   taosThreadAttrInit(&thattr);
 
@@ -773,8 +797,9 @@ TEST(queryTest, readyFirstCase) {
   schtSetPlanToString();
   schtSetExecNode();
   schtSetAsyncSendMsgToServer();
-  
-  code = schedulerAsyncExecJob(mockPointer, qnodeList, &dag, "select * from tb", &job);
+
+  int32_t queryDone = 0;  
+  code = schedulerAsyncExecJob(mockPointer, qnodeList, &dag, &job, "select * from tb", 0, schtQueryCb, &queryDone);
   ASSERT_EQ(code, 0);
 
   
@@ -824,6 +849,13 @@ TEST(queryTest, readyFirstCase) {
     pIter = taosHashIterate(pJob->execTasks, pIter);
   }    
 
+  while (true) {
+    if (queryDone) {
+      break;
+    }
+
+    taosUsleep(10000);
+  }
 
 
   TdThreadAttr thattr;
@@ -885,16 +917,17 @@ TEST(queryTest, flowCtrlCase) {
   schtSetPlanToString();
   schtSetExecNode();
   schtSetAsyncSendMsgToServer();
-  
-  code = schedulerAsyncExecJob(mockPointer, qnodeList, &dag, "select * from tb", &job);
+
+  int32_t queryDone = 0;  
+  code = schedulerAsyncExecJob(mockPointer, qnodeList, &dag, &job, "select * from tb", 0, schtQueryCb, &queryDone);
   ASSERT_EQ(code, 0);
 
   
   SSchJob *pJob = schAcquireJob(job);
 
-  bool queryDone = false;
+  bool qDone = false;
   
-  while (!queryDone) {
+  while (!qDone) {
     void *pIter = taosHashIterate(pJob->execTasks, NULL);
     if (NULL == pIter) {
       break;
@@ -915,7 +948,7 @@ TEST(queryTest, flowCtrlCase) {
         code = schHandleResponseMsg(pJob, task, TDMT_VND_RES_READY_RSP, (char *)&rsp, sizeof(rsp), 0);
         ASSERT_EQ(code, 0);
       } else {
-        queryDone = true;
+        qDone = true;
         break;
       }
       
@@ -923,6 +956,13 @@ TEST(queryTest, flowCtrlCase) {
     }    
   }
 
+  while (true) {
+    if (queryDone) {
+      break;
+    }
+
+    taosUsleep(10000);
+  }
 
   TdThreadAttr thattr;
   taosThreadAttrInit(&thattr);