diff --git a/source/dnode/vnode/src/inc/tq.h b/source/dnode/vnode/src/inc/tq.h
index b77bb54714c09254b61746f807e2e04e26a8d4cc..13b991e0386e8419b542f0be8406fa7cdd20254d 100644
--- a/source/dnode/vnode/src/inc/tq.h
+++ b/source/dnode/vnode/src/inc/tq.h
@@ -172,7 +172,6 @@ int32_t tqStreamTasksStatusCheck(STQ* pTq);
 
 // tq util
 int32_t extractDelDataBlock(const void* pData, int32_t len, int64_t ver, SStreamRefDataBlock** pRefBlock);
-int32_t tqAddInputBlockNLaunchTask(SStreamTask* pTask, SStreamQueueItem* pQueueItem);
 int32_t tqExtractDataForMq(STQ* pTq, STqHandle* pHandle, const SMqPollReq* pRequest, SRpcMsg* pMsg);
 int32_t tqDoSendDataRsp(const SRpcHandleInfo* pRpcHandleInfo, const SMqDataRsp* pRsp, int32_t epoch, int64_t consumerId,
                         int32_t type, int64_t sver, int64_t ever);
diff --git a/source/dnode/vnode/src/tq/tq.c b/source/dnode/vnode/src/tq/tq.c
index 1f6c162b9d162d310315aba8a65cecf02337c0de..30194360a8762f61810014bbc34f1271836cc0c2 100644
--- a/source/dnode/vnode/src/tq/tq.c
+++ b/source/dnode/vnode/src/tq/tq.c
@@ -1136,7 +1136,7 @@ int32_t tqProcessTaskScanHistory(STQ* pTq, SRpcMsg* pMsg) {
                pTask->streamTaskId.taskId, pTask->id.idStr);
 
         pTask->status.taskStatus = TASK_STATUS__DROPPING;
-        tqDebug("s-task:%s scan-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);
@@ -1166,12 +1166,14 @@ int32_t tqProcessTaskScanHistory(STQ* pTq, SRpcMsg* pMsg) {
     }
 
     if (!streamTaskRecoverScanStep1Finished(pTask)) {
-      tqDebug("s-task:%s level:%d verRange:%" PRId64 " - %" PRId64 " do secondary scan-history-data after halt the related stream task:%s",
-              id, pTask->info.taskLevel, pRange->minVer, pRange->maxVer, id);
+      STimeWindow* pWindow = &pTask->dataRange.window;
+      tqDebug("s-task:%s level:%d verRange:%" PRId64 " - %" PRId64 " window:%" PRId64 "-%" PRId64
+              ", do secondary scan-history data 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);
 
       st = taosGetTimestampMs();
-      streamSetParamForStreamScannerStep2(pTask, pRange, &pTask->dataRange.window);
+      streamSetParamForStreamScannerStep2(pTask, pRange, pWindow);
     }
 
     if (!streamTaskRecoverScanStep2Finished(pTask)) {
diff --git a/source/dnode/vnode/src/tq/tqRead.c b/source/dnode/vnode/src/tq/tqRead.c
index ba983b1833fa04ca26d6093d07f9f85eafef36ec..675cbe4549d1bf3d0dc916e34bef968951e1363b 100644
--- a/source/dnode/vnode/src/tq/tqRead.c
+++ b/source/dnode/vnode/src/tq/tqRead.c
@@ -336,6 +336,7 @@ int32_t extractMsgFromWal(SWalReader* pReader, void** pItem, const char* id) {
     int32_t len = pReader->pHead->head.bodyLen - sizeof(SMsgHead);
 
     extractDelDataBlock(pBody, len, ver, (SStreamRefDataBlock**)pItem);
+    tqDebug("s-task:%s delete msg extract from WAL, len:%d, ver:%"PRId64, id, len, ver);
   } else {
     ASSERT(0);
   }
diff --git a/source/dnode/vnode/src/tq/tqUtil.c b/source/dnode/vnode/src/tq/tqUtil.c
index 11bfcf7fc528e0426043eb08df00dc395e923a25..c2e4374505a568afc7809f05afe5a99fbc71e440 100644
--- a/source/dnode/vnode/src/tq/tqUtil.c
+++ b/source/dnode/vnode/src/tq/tqUtil.c
@@ -20,21 +20,6 @@
 static int32_t tqSendMetaPollRsp(STqHandle* pHandle, const SRpcMsg* pMsg, const SMqPollReq* pReq,
                                  const SMqMetaRsp* pRsp, int32_t vgId);
 
-int32_t tqAddInputBlockNLaunchTask(SStreamTask* pTask, SStreamQueueItem* pQueueItem) {
-  int32_t code = tAppendDataToInputQueue(pTask, pQueueItem);
-  if (code < 0) {
-    tqError("s-task:%s failed to put into queue, too many", pTask->id.idStr);
-    return -1;
-  }
-
-  if (streamSchedExec(pTask) < 0) {
-    tqError("stream task:%d failed to be launched, code:%s", pTask->id.taskId, tstrerror(terrno));
-    return -1;
-  }
-
-  return TSDB_CODE_SUCCESS;
-}
-
 int32_t tqInitDataRsp(SMqDataRsp* pRsp, const SMqPollReq* pReq) {
   pRsp->reqOffset = pReq->reqOffset;
 
diff --git a/source/libs/executor/src/scanoperator.c b/source/libs/executor/src/scanoperator.c
index 810f9709f5887d9bb526eeccfdd07e10dc782e9d..2059ed18e5a8010b459a2f86755ad84e4088dbc9 100644
--- a/source/libs/executor/src/scanoperator.c
+++ b/source/libs/executor/src/scanoperator.c
@@ -1800,8 +1800,10 @@ static SSDataBlock* doStreamScan(SOperatorInfo* pOperator) {
     } else {
       pTSInfo->base.cond.startVersion = pStreamInfo->fillHistoryVer.minVer;
       pTSInfo->base.cond.endVersion = pStreamInfo->fillHistoryVer.maxVer;
-      qDebug("stream recover step2, verRange:%" PRId64 " - %" PRId64", %s", pTSInfo->base.cond.startVersion,
-             pTSInfo->base.cond.endVersion, id);
+      pTSInfo->base.cond.twindows = pStreamInfo->fillHistoryWindow;
+      qDebug("stream recover step2, verRange:%" PRId64 " - %" PRId64 ", window:%" PRId64 "-%" PRId64 ", %s",
+             pTSInfo->base.cond.startVersion, pTSInfo->base.cond.endVersion, pTSInfo->base.cond.twindows.skey,
+             pTSInfo->base.cond.twindows.ekey, id);
       pStreamInfo->recoverStep = STREAM_RECOVER_STEP__SCAN2;
     }
 
diff --git a/source/libs/stream/src/stream.c b/source/libs/stream/src/stream.c
index cae7e10e3e927304c766150468c0c4c84469ef66..1c824db3b074c760cce06ef9fd2a451c4a679f29 100644
--- a/source/libs/stream/src/stream.c
+++ b/source/libs/stream/src/stream.c
@@ -65,7 +65,7 @@ static void streamSchedByTimer(void* param, void* tmrId) {
   SStreamTask* pTask = (void*)param;
 
   int8_t status = atomic_load_8(&pTask->triggerStatus);
-  qDebug("s-task:%s in scheduler timer, trigger status:%d", pTask->id.idStr, status);
+  qDebug("s-task:%s in scheduler, trigger status:%d, next:%dms", pTask->id.idStr, status, (int32_t)pTask->triggerParam);
 
   if (streamTaskShouldStop(&pTask->status) || streamTaskShouldPause(&pTask->status)) {
     streamMetaReleaseTask(NULL, pTask);
@@ -74,23 +74,22 @@ static void streamSchedByTimer(void* param, void* tmrId) {
   }
 
   if (status == TASK_TRIGGER_STATUS__ACTIVE) {
-    SStreamTrigger* trigger = taosAllocateQitem(sizeof(SStreamTrigger), DEF_QITEM, 0);
-    if (trigger == NULL) {
+    SStreamTrigger* pTrigger = taosAllocateQitem(sizeof(SStreamTrigger), DEF_QITEM, 0);
+    if (pTrigger == NULL) {
       return;
     }
 
-    trigger->type = STREAM_INPUT__GET_RES;
-    trigger->pBlock = taosMemoryCalloc(1, sizeof(SSDataBlock));
-    if (trigger->pBlock == NULL) {
-      taosFreeQitem(trigger);
+    pTrigger->type = STREAM_INPUT__GET_RES;
+    pTrigger->pBlock = taosMemoryCalloc(1, sizeof(SSDataBlock));
+    if (pTrigger->pBlock == NULL) {
+      taosFreeQitem(pTrigger);
       return;
     }
 
-    trigger->pBlock->info.type = STREAM_GET_ALL;
     atomic_store_8(&pTask->triggerStatus, TASK_TRIGGER_STATUS__INACTIVE);
-
-    if (tAppendDataToInputQueue(pTask, (SStreamQueueItem*)trigger) < 0) {
-      taosFreeQitem(trigger);
+    pTrigger->pBlock->info.type = STREAM_GET_ALL;
+    if (tAppendDataToInputQueue(pTask, (SStreamQueueItem*)pTrigger) < 0) {
+      taosFreeQitem(pTrigger);
       taosTmrReset(streamSchedByTimer, (int32_t)pTask->triggerParam, pTask, streamEnv.timer, &pTask->schedTimer);
       return;
     }
@@ -399,6 +398,7 @@ int32_t tAppendDataToInputQueue(SStreamTask* pTask, SStreamQueueItem* pItem) {
 
   if (type != STREAM_INPUT__GET_RES && type != STREAM_INPUT__CHECKPOINT && pTask->triggerParam != 0) {
     atomic_val_compare_exchange_8(&pTask->triggerStatus, TASK_TRIGGER_STATUS__INACTIVE, TASK_TRIGGER_STATUS__ACTIVE);
+    qDebug("s-task:%s new data arrived, active the trigger, trigerStatus:%d", pTask->id.idStr, pTask->triggerStatus);
   }
 
   return 0;
diff --git a/source/libs/stream/src/streamData.c b/source/libs/stream/src/streamData.c
index 92f1fc47abb8211d652e666fccd6f8e5245d8c5f..bb4b842787a640435f561d6e75074869da8885af 100644
--- a/source/libs/stream/src/streamData.c
+++ b/source/libs/stream/src/streamData.c
@@ -166,6 +166,8 @@ int32_t streamMergeSubmit(SStreamMergedSubmit* pMerged, SStreamDataSubmit* pSubm
 }
 
 SStreamQueueItem* streamMergeQueueItem(SStreamQueueItem* dst, SStreamQueueItem* pElem) {
+  terrno = 0;
+  
   if (dst->type == STREAM_INPUT__DATA_BLOCK && pElem->type == STREAM_INPUT__DATA_BLOCK) {
     SStreamDataBlock* pBlock = (SStreamDataBlock*)dst;
     SStreamDataBlock* pBlockSrc = (SStreamDataBlock*)pElem;
@@ -181,7 +183,10 @@ SStreamQueueItem* streamMergeQueueItem(SStreamQueueItem* dst, SStreamQueueItem*
     return dst;
   } else if (dst->type == STREAM_INPUT__DATA_SUBMIT && pElem->type == STREAM_INPUT__DATA_SUBMIT) {
     SStreamMergedSubmit* pMerged = streamMergedSubmitNew();
-    // todo handle error
+    if (pMerged == NULL) {
+      terrno = TSDB_CODE_OUT_OF_MEMORY;
+      return NULL;
+    }
 
     streamMergeSubmit(pMerged, (SStreamDataSubmit*)dst);
     streamMergeSubmit(pMerged, (SStreamDataSubmit*)pElem);
@@ -189,6 +194,7 @@ SStreamQueueItem* streamMergeQueueItem(SStreamQueueItem* dst, SStreamQueueItem*
     taosFreeQitem(pElem);
     return (SStreamQueueItem*)pMerged;
   } else {
+    qDebug("block type:%d not merged with existed blocks list, type:%d", pElem->type, dst->type);
     return NULL;
   }
 }
diff --git a/source/libs/stream/src/streamExec.c b/source/libs/stream/src/streamExec.c
index e7adcf36dc5b4b2873ecb61390162579d9c922de..a1922f355312070b08905a70d33b2e6b6eaf3065 100644
--- a/source/libs/stream/src/streamExec.c
+++ b/source/libs/stream/src/streamExec.c
@@ -407,9 +407,11 @@ static int32_t streamTransferStateToStreamTask(SStreamTask* pTask) {
 
   streamTaskResumeFromHalt(pStreamTask);
 
-  pTask->status.taskStatus = TASK_STATUS__DROPPING;
   qDebug("s-task:%s fill-history task set status to be dropping, save the state into disk", pTask->id.idStr);
 
+  pTask->status.taskStatus = TASK_STATUS__DROPPING;
+  streamMetaRemoveTask(pMeta, pTask->id.taskId);
+
   // save to disk
   taosWLockLatch(&pMeta->lock);
   streamMetaSaveTask(pMeta, pTask);
@@ -464,7 +466,12 @@ static int32_t extractMsgFromInputQ(SStreamTask* pTask, SStreamQueueItem** pInpu
       // todo we need to sort the data block, instead of just appending into the array list.
       void* newRet = streamMergeQueueItem(*pInput, qItem);
       if (newRet == NULL) {
-        qError("s-task:%s failed to merge blocks from inputQ, numOfBlocks:%d", id, *numOfBlocks);
+        if (terrno == 0) {
+          qDebug("s-task:%s failed to merge blocks from inputQ, numOfBlocks:%d", id, *numOfBlocks);
+        } else {
+          qDebug("s-task:%s failed to merge blocks from inputQ, numOfBlocks:%d, code:%s", id, *numOfBlocks,
+              tstrerror(terrno));
+        }
         streamQueueProcessFail(pTask->inputQueue);
         return TSDB_CODE_SUCCESS;
       }