diff --git a/include/libs/stream/tstream.h b/include/libs/stream/tstream.h
index b7544a13cadc4af85738d66434fd57b2ec3e2a87..066f83fbcbb96b1df73d50982c0ba2702bc2b296 100644
--- a/include/libs/stream/tstream.h
+++ b/include/libs/stream/tstream.h
@@ -45,7 +45,6 @@ enum {
   TASK_STATUS__FAIL,
   TASK_STATUS__STOP,
   TASK_STATUS__SCAN_HISTORY,  // stream task scan history data by using tsdbread in the stream scanner
-  TASK_STATUS__SCAN_HISTORY_WAL, // scan history data in wal
   TASK_STATUS__HALT,          // pause, but not be manipulated by user command
   TASK_STATUS__PAUSE,         // pause
 };
diff --git a/source/dnode/vnode/src/tq/tq.c b/source/dnode/vnode/src/tq/tq.c
index bedb8bba0cd691068985e61ff2092baacebfc8cd..ccdf0c88a5a7dd1bb8fb197d63e5369d326bf3a8 100644
--- a/source/dnode/vnode/src/tq/tq.c
+++ b/source/dnode/vnode/src/tq/tq.c
@@ -1145,7 +1145,6 @@ int32_t tqProcessTaskDeployReq(STQ* pTq, int64_t sversion, char* msg, int32_t ms
   // 3. It's an fill history task, do nothing. wait for the main task to start it
   SStreamTask* p = streamMetaAcquireTask(pStreamMeta, taskId);
   if (p != NULL) { // reset the downstreamReady flag.
-    p->status.downstreamReady = 0;
     streamTaskCheckDownstreamTasks(p);
   }
 
@@ -1154,12 +1153,10 @@ int32_t tqProcessTaskDeployReq(STQ* pTq, int64_t sversion, char* msg, int32_t ms
 }
 
 int32_t tqProcessTaskScanHistory(STQ* pTq, SRpcMsg* pMsg) {
-  int32_t code = TSDB_CODE_SUCCESS;
-  char*   msg = pMsg->pCont;
-
+  SStreamScanHistoryReq* pReq = (SStreamScanHistoryReq*)pMsg->pCont;
   SStreamMeta*           pMeta = pTq->pStreamMeta;
-  SStreamScanHistoryReq* pReq = (SStreamScanHistoryReq*)msg;
 
+  int32_t      code = TSDB_CODE_SUCCESS;
   SStreamTask* pTask = streamMetaAcquireTask(pMeta, pReq->taskId);
   if (pTask == NULL) {
     tqError("vgId:%d failed to acquire stream task:0x%x during stream recover, task may have been destroyed",
@@ -1167,12 +1164,20 @@ int32_t tqProcessTaskScanHistory(STQ* pTq, SRpcMsg* pMsg) {
     return -1;
   }
 
-  // do recovery step 1
+  // do recovery step1
   const char* id = pTask->id.idStr;
   const char* pStatus = streamGetTaskStatusStr(pTask->status.taskStatus);
-  tqDebug("s-task:%s start history data scan stage(step 1), status:%s", id, pStatus);
+  tqDebug("s-task:%s start scan-history stage(step 1), status:%s", id, pStatus);
 
-  int64_t st = taosGetTimestampMs();
+  if (pTask->tsInfo.step1Start == 0) {
+    ASSERT(pTask->status.pauseAllowed == false);
+    pTask->tsInfo.step1Start = taosGetTimestampMs();
+    if (pTask->info.fillHistory == 1) {
+      streamTaskEnablePause(pTask);
+    }
+  } else {
+    tqDebug("s-task:%s resume from paused, start ts:%"PRId64, pTask->id.idStr, pTask->tsInfo.step1Start);
+  }
 
   // we have to continue retrying to successfully execute the scan history task.
   int8_t schedStatus = atomic_val_compare_exchange_8(&pTask->status.schedStatus, TASK_SCHED_STATUS__INACTIVE,
@@ -1185,31 +1190,21 @@ int32_t tqProcessTaskScanHistory(STQ* pTq, SRpcMsg* pMsg) {
     return 0;
   }
 
-  ASSERT(pTask->status.pauseAllowed == false);
-
   if (pTask->info.fillHistory == 1) {
-    streamTaskEnablePause(pTask);
-  }
-
-  if (!streamTaskRecoverScanStep1Finished(pTask)) {
-    streamSourceScanHistoryData(pTask);
+    ASSERT(pTask->status.pauseAllowed == true);
   }
 
-  // disable the pause when handling the step2 scan of tsdb data.
-  // the whole next procedure cann't be stopped.
-  // todo fix it: the following procedure should be executed completed and then shutdown when trying to close vnode.
-  if (pTask->info.fillHistory == 1) {
-    streamTaskDisablePause(pTask);
-  }
-
-  if (streamTaskShouldStop(&pTask->status) || streamTaskShouldPause(&pTask->status)) {
-    tqDebug("s-task:%s is dropped or paused, abort recover in step1", id);
+  streamSourceScanHistoryData(pTask);
+  if (pTask->status.taskStatus == TASK_STATUS__PAUSE) {
+    double el = (taosGetTimestampMs() - pTask->tsInfo.step1Start) / 1000.0;
+    tqDebug("s-task:%s is paused in the step1, elapsed time:%.2fs, sched-status:%d", pTask->id.idStr, el,
+            TASK_SCHED_STATUS__INACTIVE);
     atomic_store_8(&pTask->status.schedStatus, TASK_SCHED_STATUS__INACTIVE);
-    streamMetaReleaseTask(pMeta, pTask);
     return 0;
   }
 
-  double el = (taosGetTimestampMs() - st) / 1000.0;
+  // the following procedure should be executed, no matter status is stop/pause or not
+  double el = (taosGetTimestampMs() - pTask->tsInfo.step1Start) / 1000.0;
   tqDebug("s-task:%s scan-history stage(step 1) ended, elapsed time:%.2fs", id, el);
 
   if (pTask->info.fillHistory) {
@@ -1217,77 +1212,71 @@ int32_t tqProcessTaskScanHistory(STQ* pTq, SRpcMsg* pMsg) {
     SStreamTask*   pStreamTask = NULL;
     bool           done = false;
 
-    if (!pReq->igUntreated && !streamTaskRecoverScanStep1Finished(pTask)) {
-      // 1. stop the related stream task, get the current scan wal version of stream task, ver.
-      pStreamTask = streamMetaAcquireTask(pMeta, pTask->streamTaskId.taskId);
-      if (pStreamTask == NULL) {
-        qError("failed to find s-task:0x%x, it may have been destroyed, drop fill-history task:%s",
-               pTask->streamTaskId.taskId, pTask->id.idStr);
+    // 1. get the related stream task
+    pStreamTask = streamMetaAcquireTask(pMeta, pTask->streamTaskId.taskId);
+    if (pStreamTask == NULL) {
+      // todo delete this task, if the related stream task is dropped
+      qError("failed to find s-task:0x%x, it may have been destroyed, drop fill-history task:%s",
+             pTask->streamTaskId.taskId, pTask->id.idStr);
 
-        pTask->status.taskStatus = TASK_STATUS__DROPPING;
-        tqDebug("s-task:%s fill-history task set status to be dropping", id);
+      tqDebug("s-task:%s fill-history task set status to be dropping", id);
 
-        streamMetaSaveTask(pMeta, pTask);
-        streamMetaReleaseTask(pMeta, pTask);
-        return -1;
-      }
+      streamMetaUnregisterTask(pMeta, pTask->id.taskId);
+      streamMetaReleaseTask(pMeta, pTask);
+      return -1;
+    }
 
-      ASSERT(pStreamTask->info.taskLevel == TASK_LEVEL__SOURCE);
+    ASSERT(pStreamTask->info.taskLevel == TASK_LEVEL__SOURCE);
 
-      // stream task in TASK_STATUS__SCAN_HISTORY can not be paused.
-      // wait for the stream task get ready for scan history data
-      while (pStreamTask->status.taskStatus == TASK_STATUS__SCAN_HISTORY) {
-        tqDebug(
-            "s-task:%s level:%d related stream task:%s(status:%s) not ready for halt, wait for it and recheck in 100ms",
-            id, pTask->info.taskLevel, pStreamTask->id.idStr, streamGetTaskStatusStr(pStreamTask->status.taskStatus));
-        taosMsleep(100);
-      }
+    // 2. it cannot be paused, when the stream task in TASK_STATUS__SCAN_HISTORY status. Let's wait for the
+    // stream task get ready for scan history data
+    while (pStreamTask->status.taskStatus == TASK_STATUS__SCAN_HISTORY) {
+      tqDebug(
+          "s-task:%s level:%d related stream task:%s(status:%s) not ready for halt, wait for it and recheck in 100ms",
+          id, pTask->info.taskLevel, pStreamTask->id.idStr, streamGetTaskStatusStr(pStreamTask->status.taskStatus));
+      taosMsleep(100);
+    }
 
-      // now we can stop the stream task execution
-      streamTaskHalt(pStreamTask);
-      tqDebug("s-task:%s level:%d sched-status:%d is halt by fill-history task:%s", pStreamTask->id.idStr,
-              pStreamTask->info.taskLevel, pStreamTask->status.schedStatus, id);
+    // now we can stop the stream task execution
+    streamTaskHalt(pStreamTask);
 
-      // if it's an source task, extract the last version in wal.
-      pRange = &pTask->dataRange.range;
-      int64_t latestVer = walReaderGetCurrentVer(pStreamTask->exec.pWalReader);
-      done = streamHistoryTaskSetVerRangeStep2(pTask, latestVer);
-    }
+    tqDebug("s-task:%s level:%d sched-status:%d is halt by fill-history task:%s", pStreamTask->id.idStr,
+            pStreamTask->info.taskLevel, pStreamTask->status.schedStatus, id);
+
+    // if it's an source task, extract the last version in wal.
+    pRange = &pTask->dataRange.range;
+    int64_t latestVer = walReaderGetCurrentVer(pStreamTask->exec.pWalReader);
+    done = streamHistoryTaskSetVerRangeStep2(pTask, latestVer);
 
     if (done) {
       pTask->tsInfo.step2Start = taosGetTimestampMs();
       streamTaskEndScanWAL(pTask);
       streamMetaReleaseTask(pMeta, pTask);
     } else {
-      if (!streamTaskRecoverScanStep1Finished(pTask)) {
-        STimeWindow* pWindow = &pTask->dataRange.window;
-        tqDebug("s-task:%s level:%d verRange:%" PRId64 " - %" PRId64 " window:%" PRId64 "-%" PRId64
-                ", do secondary scan-history from WAL after halt the related stream task:%s",
-                id, pTask->info.taskLevel, pRange->minVer, pRange->maxVer, pWindow->skey, pWindow->ekey, id);
-        ASSERT(pTask->status.schedStatus == TASK_SCHED_STATUS__WAITING);
-
-        pTask->tsInfo.step2Start = taosGetTimestampMs();
-        streamSetParamForStreamScannerStep2(pTask, pRange, pWindow);
-      }
+      STimeWindow* pWindow = &pTask->dataRange.window;
+      tqDebug("s-task:%s level:%d verRange:%" PRId64 " - %" PRId64 " window:%" PRId64 "-%" PRId64
+              ", do secondary scan-history from WAL after halt the related stream task:%s",
+              id, pTask->info.taskLevel, pRange->minVer, pRange->maxVer, pWindow->skey, pWindow->ekey,
+              pStreamTask->id.idStr);
+      ASSERT(pTask->status.schedStatus == TASK_SCHED_STATUS__WAITING);
 
-      if (!streamTaskRecoverScanStep2Finished(pTask)) {
-        pTask->status.taskStatus = TASK_STATUS__SCAN_HISTORY_WAL;
-        if (streamTaskShouldStop(&pTask->status) || streamTaskShouldPause(&pTask->status)) {
-          tqDebug("s-task:%s is dropped or paused, abort recover in step1", id);
-          streamMetaReleaseTask(pMeta, pTask);
-          return 0;
-        }
+      pTask->tsInfo.step2Start = taosGetTimestampMs();
+      streamSetParamForStreamScannerStep2(pTask, pRange, pWindow);
 
-        int64_t dstVer = pTask->dataRange.range.minVer - 1;
+      int64_t dstVer = pTask->dataRange.range.minVer - 1;
 
-        pTask->chkInfo.currentVer = dstVer;
-        walReaderSetSkipToVersion(pTask->exec.pWalReader, dstVer);
-        tqDebug("s-task:%s wal reader start scan from WAL ver:%" PRId64 ", set sched-status:%d", id, dstVer,
-                TASK_SCHED_STATUS__INACTIVE);
-      }
+      pTask->chkInfo.currentVer = dstVer;
+      walReaderSetSkipToVersion(pTask->exec.pWalReader, dstVer);
+      tqDebug("s-task:%s wal reader start scan WAL verRange:%" PRId64 "-%" PRId64 ", set sched-status:%d", id, dstVer,
+              pTask->dataRange.range.maxVer, TASK_SCHED_STATUS__INACTIVE);
 
       atomic_store_8(&pTask->status.schedStatus, TASK_SCHED_STATUS__INACTIVE);
 
+      // set the fill-history task to be normal
+      if (pTask->info.fillHistory == 1) {
+        streamSetStatusNormal(pTask);
+      }
+
       // 4. 1) transfer the ownership of executor state, 2) update the scan data range for source task.
       // 5. resume the related stream task.
       streamMetaReleaseTask(pMeta, pTask);
@@ -1304,7 +1293,7 @@ int32_t tqProcessTaskScanHistory(STQ* pTq, SRpcMsg* pMsg) {
     if (pTask->historyTaskId.taskId == 0) {
       *pWindow = (STimeWindow){INT64_MIN, INT64_MAX};
       tqDebug(
-          "s-task:%s scanhistory in stream time window completed, no related fill-history task, reset the time "
+          "s-task:%s scan-history in stream time window completed, no related fill-history task, reset the time "
           "window:%" PRId64 " - %" PRId64,
           id, pWindow->skey, pWindow->ekey);
       qResetStreamInfoTimeWindow(pTask->exec.pExecutor);
@@ -1500,7 +1489,7 @@ int32_t tqProcessTaskRunReq(STQ* pTq, SRpcMsg* pMsg) {
   if (pTask != NULL) {
     // even in halt status, the data in inputQ must be processed
     int8_t st = pTask->status.taskStatus;
-    if (st == TASK_STATUS__NORMAL || st == TASK_STATUS__SCAN_HISTORY || st == TASK_STATUS__SCAN_HISTORY_WAL) {
+    if (st == TASK_STATUS__NORMAL || st == TASK_STATUS__SCAN_HISTORY/* || st == TASK_STATUS__SCAN_HISTORY_WAL*/) {
       tqDebug("vgId:%d s-task:%s start to process block from inputQ, last chk point:%" PRId64, vgId, pTask->id.idStr,
               pTask->chkInfo.version);
       streamProcessRunReq(pTask);
@@ -1637,7 +1626,7 @@ int32_t tqProcessTaskResumeImpl(STQ* pTq, SStreamTask* pTask, int64_t sversion,
               vgId, pTask->id.idStr, pTask->chkInfo.currentVer, sversion, pTask->status.schedStatus);
     }
 
-    if (level == TASK_LEVEL__SOURCE && pTask->info.fillHistory) {
+    if (level == TASK_LEVEL__SOURCE && pTask->info.fillHistory && pTask->status.taskStatus == TASK_STATUS__SCAN_HISTORY) {
       streamStartRecoverTask(pTask, igUntreated);
     } else if (level == TASK_LEVEL__SOURCE && (taosQueueItemSize(pTask->inputQueue->queue) == 0)) {
       tqStartStreamTasks(pTq);
diff --git a/source/dnode/vnode/src/tq/tqRestore.c b/source/dnode/vnode/src/tq/tqRestore.c
index 67ae160d6de2cf1dca5896d76c0ad04d5d8449db..f4d82e456e58012a07d1d5f3b2c5400011f45fad 100644
--- a/source/dnode/vnode/src/tq/tqRestore.c
+++ b/source/dnode/vnode/src/tq/tqRestore.c
@@ -211,7 +211,7 @@ int32_t doSetOffsetForWalReader(SStreamTask *pTask, int32_t vgId) {
 
 static void checkForFillHistoryVerRange(SStreamTask* pTask, int64_t ver) {
   if ((pTask->info.fillHistory == 1) && ver > pTask->dataRange.range.maxVer) {
-    qWarn("s-task:%s fill-history scan WAL, currentVer:%" PRId64 "reach the maximum ver:%" PRId64
+    qWarn("s-task:%s fill-history scan WAL, currentVer:%" PRId64 " reach the maximum ver:%" PRId64
           ", not scan wal anymore, set the transfer state flag",
           pTask->id.idStr, ver, pTask->dataRange.range.maxVer);
     pTask->status.transferState = true;
@@ -256,14 +256,15 @@ int32_t createStreamTaskRunReq(SStreamMeta* pStreamMeta, bool* pScanIdle) {
       continue;
     }
 
-    if (status != TASK_STATUS__NORMAL && status != TASK_STATUS__SCAN_HISTORY_WAL) {
+    if (status != TASK_STATUS__NORMAL/* && status != TASK_STATUS__SCAN_HISTORY_WAL*/) {
       tqDebug("s-task:%s not ready for new submit block from wal, status:%s", pTask->id.idStr, streamGetTaskStatusStr(status));
       streamMetaReleaseTask(pStreamMeta, pTask);
       continue;
     }
 
     if ((pTask->info.fillHistory == 1) && pTask->status.transferState) {
-      ASSERT(status == TASK_STATUS__SCAN_HISTORY_WAL);
+//      ASSERT(status == TASK_STATUS__SCAN_HISTORY_WAL);
+      ASSERT(status == TASK_STATUS__NORMAL);
       // the maximum version of data in the WAL has reached already, the step2 is done
       tqDebug("s-task:%s fill-history reach the maximum ver:%" PRId64 ", not scan wal anymore", pTask->id.idStr,
             pTask->dataRange.range.maxVer);
diff --git a/source/libs/executor/src/scanoperator.c b/source/libs/executor/src/scanoperator.c
index 6eee9df52823f38bfcd1bdbae69952edc58cd245..3d5e4a7d5f23c425efa2ca963732bda69a50b7fc 100644
--- a/source/libs/executor/src/scanoperator.c
+++ b/source/libs/executor/src/scanoperator.c
@@ -2121,8 +2121,7 @@ FETCH_NEXT_BLOCK:
       return pInfo->pUpdateRes;
     }
 
-    SSDataBlock*    pBlock = pInfo->pRes;
-    SDataBlockInfo* pBlockInfo = &pBlock->info;
+    SDataBlockInfo* pBlockInfo = &pInfo->pRes->info;
     int32_t         totalBlocks = taosArrayGetSize(pInfo->pBlockLists);
 
   NEXT_SUBMIT_BLK:
@@ -2146,35 +2145,36 @@ FETCH_NEXT_BLOCK:
         }
       }
 
-      blockDataCleanup(pBlock);
+      blockDataCleanup(pInfo->pRes);
 
       while (pAPI->tqReaderFn.tqNextBlockImpl(pInfo->tqReader, id)) {
         SSDataBlock* pRes = NULL;
 
         int32_t code = pAPI->tqReaderFn.tqRetrieveBlock(pInfo->tqReader, &pRes, id);
-        qDebug("retrieve data from submit completed code:%s, rows:%" PRId64 " %s", tstrerror(code), pRes->info.rows,
-               id);
+        qDebug("retrieve data from submit completed code:%s rows:%" PRId64 " %s", tstrerror(code), pRes->info.rows, id);
 
         if (code != TSDB_CODE_SUCCESS || pRes->info.rows == 0) {
           qDebug("retrieve data failed, try next block in submit block, %s", id);
           continue;
         }
 
-        setBlockIntoRes(pInfo, pRes, false);
+        // filter the block extracted from WAL files, according to the time window
+        // apply additional time window filter
+        doBlockDataWindowFilter(pRes, pInfo->primaryTsIndex, &pStreamInfo->fillHistoryWindow, id);
+        blockDataUpdateTsWindow(pInfo->pRes, pInfo->primaryTsIndex);
+        if (pRes->info.rows == 0) {
+          continue;
+        }
 
+        setBlockIntoRes(pInfo, pRes, false);
         if (pInfo->pCreateTbRes->info.rows > 0) {
           pInfo->scanMode = STREAM_SCAN_FROM_RES;
           qDebug("create table res exists, rows:%"PRId64" return from stream scan, %s", pInfo->pCreateTbRes->info.rows, id);
           return pInfo->pCreateTbRes;
         }
 
-        // apply additional time window filter
-        doBlockDataWindowFilter(pBlock, pInfo->primaryTsIndex, &pStreamInfo->fillHistoryWindow, id);
-        pBlock->info.dataLoad = 1;
-        blockDataUpdateTsWindow(pBlock, pInfo->primaryTsIndex);
-
-        doCheckUpdate(pInfo, pBlockInfo->window.ekey, pBlock);
-        doFilter(pBlock, pOperator->exprSupp.pFilterInfo, NULL);
+        doCheckUpdate(pInfo, pBlockInfo->window.ekey, pInfo->pRes);
+        doFilter(pInfo->pRes, pOperator->exprSupp.pFilterInfo, NULL);
 
         int64_t numOfUpdateRes = pInfo->pUpdateDataRes->info.rows;
         qDebug("%s %" PRId64 " rows in datablock, update res:%" PRId64, id, pBlockInfo->rows, numOfUpdateRes);
@@ -2196,7 +2196,7 @@ FETCH_NEXT_BLOCK:
 
     qDebug("stream scan completed, and return source rows:%" PRId64", %s", pBlockInfo->rows, id);
     if (pBlockInfo->rows > 0) {
-      return pBlock;
+      return pInfo->pRes;
     }
 
     if (pInfo->pUpdateDataRes->info.rows > 0) {
diff --git a/source/libs/stream/src/streamExec.c b/source/libs/stream/src/streamExec.c
index c546b3619130dc2143cd0a88fa6b53dadc97a2aa..4ef7d6084d9a0da77c6e58254fb2c1d3e00e6eb6 100644
--- a/source/libs/stream/src/streamExec.c
+++ b/source/libs/stream/src/streamExec.c
@@ -172,6 +172,12 @@ int32_t streamScanExec(SStreamTask* pTask, int32_t batchSz) {
   bool finished = false;
 
   while (1) {
+    if (streamTaskShouldPause(&pTask->status)) {
+      double el = (taosGetTimestampMs() - pTask->tsInfo.step1Start) / 1000.0;
+      qDebug("s-task:%s paused from the scan-history task, elapsed time:%.2fsec", pTask->id.idStr, el);
+      return 0;
+    }
+
     SArray* pRes = taosArrayInit(0, sizeof(SSDataBlock));
     if (pRes == NULL) {
       terrno = TSDB_CODE_OUT_OF_MEMORY;
@@ -404,6 +410,8 @@ static int32_t streamTransferStateToStreamTask(SStreamTask* pTask) {
   streamTaskReleaseState(pTask);
   streamTaskReloadState(pStreamTask);
 
+  // clear the link between fill-history task and stream task info
+  pStreamTask->historyTaskId.taskId = 0;
   streamTaskResumeFromHalt(pStreamTask);
 
   qDebug("s-task:%s fill-history task set status to be dropping, save the state into disk", pTask->id.idStr);
@@ -414,6 +422,7 @@ static int32_t streamTransferStateToStreamTask(SStreamTask* pTask) {
 
   // save to disk
   taosWLockLatch(&pMeta->lock);
+
   streamMetaSaveTask(pMeta, pStreamTask);
   if (streamMetaCommit(pMeta) < 0) {
     // persist to disk
@@ -615,7 +624,7 @@ int32_t streamTryExec(SStreamTask* pTask) {
     // todo the task should be commit here
     if (taosQueueEmpty(pTask->inputQueue->queue)) {
       // fill-history WAL scan has completed
-      if (pTask->status.taskStatus == TASK_STATUS__SCAN_HISTORY_WAL && pTask->status.transferState == true) {
+      if (pTask->info.taskLevel == TASK_LEVEL__SOURCE && pTask->status.transferState == true) {
         streamTaskRecoverSetAllStepFinished(pTask);
         streamTaskEndScanWAL(pTask);
       } else {
diff --git a/source/libs/stream/src/streamRecover.c b/source/libs/stream/src/streamRecover.c
index 4dc7b8766434cc3f7d936c7a2056384d007ef854..df45ff2759e512b799b2f8b1203e47d3823573f5 100644
--- a/source/libs/stream/src/streamRecover.c
+++ b/source/libs/stream/src/streamRecover.c
@@ -85,6 +85,7 @@ int32_t streamTaskLaunchScanHistory(SStreamTask* pTask) {
     if (pTask->info.fillHistory) {
       streamSetParamForScanHistory(pTask);
     }
+    streamTaskEnablePause(pTask);
     streamTaskScanHistoryPrepare(pTask);
   } else if (pTask->info.taskLevel == TASK_LEVEL__SINK) {
     qDebug("s-task:%s sink task do nothing to handle scan-history", pTask->id.idStr);
@@ -839,7 +840,7 @@ void streamTaskPause(SStreamTask* pTask) {
     return;
   }
 
-  while(!pTask->status.pauseAllowed || (pTask->status.taskStatus == TASK_STATUS__HALT)) {
+  while (!pTask->status.pauseAllowed || (pTask->status.taskStatus == TASK_STATUS__HALT)) {
     status = pTask->status.taskStatus;
     if (status == TASK_STATUS__DROPPING) {
       qDebug("vgId:%d s-task:%s task already dropped, do nothing", pMeta->vgId, pTask->id.idStr);
@@ -856,8 +857,19 @@ void streamTaskPause(SStreamTask* pTask) {
     taosMsleep(100);
   }
 
+  // todo: use the lock of the task.
+  taosWLockLatch(&pMeta->lock);
+
+  status = pTask->status.taskStatus;
+  if (status == TASK_STATUS__DROPPING || status == TASK_STATUS__STOP) {
+    taosWUnLockLatch(&pMeta->lock);
+    qDebug("vgId:%d s-task:%s task already dropped/stopped/paused, do nothing", pMeta->vgId, pTask->id.idStr);
+    return;
+  }
+
   atomic_store_8(&pTask->status.keepTaskStatus, pTask->status.taskStatus);
   atomic_store_8(&pTask->status.taskStatus, TASK_STATUS__PAUSE);
+  taosWUnLockLatch(&pMeta->lock);
 
   int64_t el = taosGetTimestampMs() - st;
   qDebug("vgId:%d s-task:%s set pause flag, prev:%s, elapsed time:%dms", pMeta->vgId, pTask->id.idStr,