diff --git a/include/common/tglobal.h b/include/common/tglobal.h
index 157e37f080bd730c0a08f1bc622a6c0089eb50cd..ced94e0f11a4410e971c4ca8f1ccf71a05041c46 100644
--- a/include/common/tglobal.h
+++ b/include/common/tglobal.h
@@ -29,7 +29,6 @@ extern "C" {
 #define SLOW_LOG_TYPE_OTHERS 0x4
 #define SLOW_LOG_TYPE_ALL    0xFFFFFFFF
 
-
 // cluster
 extern char     tsFirst[];
 extern char     tsSecond[];
@@ -181,6 +180,7 @@ extern bool    tsDisableStream;
 extern int64_t tsStreamBufferSize;
 extern int64_t tsCheckpointInterval;
 extern bool    tsFilterScalarMode;
+extern int32_t tsMaxStreamBackendCache;
 
 // #define NEEDTO_COMPRESSS_MSG(size) (tsCompressMsgSize != -1 && (size) > tsCompressMsgSize)
 
diff --git a/source/common/src/tglobal.c b/source/common/src/tglobal.c
index c648f8551ae8bd8948b618a3c3671aa50d469299..c5646d92d1ee23000e5848129a81249c16737dd8 100644
--- a/source/common/src/tglobal.c
+++ b/source/common/src/tglobal.c
@@ -60,6 +60,7 @@ int32_t tsNumOfQnodeQueryThreads = 4;
 int32_t tsNumOfQnodeFetchThreads = 1;
 int32_t tsNumOfSnodeStreamThreads = 4;
 int32_t tsNumOfSnodeWriteThreads = 1;
+int32_t tsMaxStreamBackendCache = 128;  // M
 
 // sync raft
 int32_t tsElectInterval = 25 * 1000;
@@ -105,7 +106,7 @@ int32_t tsQueryPolicy = 1;
 int32_t tsQueryRspPolicy = 0;
 int64_t tsQueryMaxConcurrentTables = 200;  // unit is TSDB_TABLE_NUM_UNIT
 bool    tsEnableQueryHb = false;
-bool    tsEnableScience = false; // on taos-cli show float and doulbe with scientific notation if true 
+bool    tsEnableScience = false;  // on taos-cli show float and doulbe with scientific notation if true
 int32_t tsQuerySmaOptimize = 0;
 int32_t tsQueryRsmaTolerance = 1000;  // the tolerance time (ms) to judge from which level to query rsma data.
 bool    tsQueryPlannerTrace = false;
@@ -117,8 +118,8 @@ int32_t tsRedirectFactor = 2;
 int32_t tsRedirectMaxPeriod = 1000;
 int32_t tsMaxRetryWaitTime = 10000;
 bool    tsUseAdapter = false;
-int32_t tsMetaCacheMaxSize = -1; // MB
-int32_t tsSlowLogThreshold = 3; // seconds
+int32_t tsMetaCacheMaxSize = -1;  // MB
+int32_t tsSlowLogThreshold = 3;   // seconds
 int32_t tsSlowLogScope = SLOW_LOG_TYPE_ALL;
 
 /*
@@ -349,7 +350,8 @@ static int32_t taosAddClientCfg(SConfig *pCfg) {
   if (cfgAddInt32(pCfg, "maxRetryWaitTime", tsMaxRetryWaitTime, 0, 86400000, 0) != 0) return -1;
   if (cfgAddBool(pCfg, "useAdapter", tsUseAdapter, true) != 0) return -1;
   if (cfgAddBool(pCfg, "crashReporting", tsEnableCrashReport, true) != 0) return -1;
-  if (cfgAddInt64(pCfg, "queryMaxConcurrentTables", tsQueryMaxConcurrentTables, INT64_MIN, INT64_MAX, 1) != 0) return -1;
+  if (cfgAddInt64(pCfg, "queryMaxConcurrentTables", tsQueryMaxConcurrentTables, INT64_MIN, INT64_MAX, 1) != 0)
+    return -1;
   if (cfgAddInt32(pCfg, "metaCacheMaxSize", tsMetaCacheMaxSize, -1, INT32_MAX, 1) != 0) return -1;
   if (cfgAddInt32(pCfg, "slowLogThreshold", tsSlowLogThreshold, 0, INT32_MAX, true) != 0) return -1;
   if (cfgAddString(pCfg, "slowLogScope", "", true) != 0) return -1;
@@ -524,6 +526,7 @@ static int32_t taosAddServerCfg(SConfig *pCfg) {
   if (cfgAddInt32(pCfg, "cacheLazyLoadThreshold", tsCacheLazyLoadThreshold, 0, 100000, 0) != 0) return -1;
 
   if (cfgAddBool(pCfg, "filterScalarMode", tsFilterScalarMode, 0) != 0) return -1;
+  if (cfgAddInt32(pCfg, "maxStreamBackendCache", tsMaxStreamBackendCache, 16, 1024, 0) != 0) return -1;
 
   GRANT_CFG_ADD;
   return 0;
@@ -781,7 +784,7 @@ static int32_t taosSetClientCfg(SConfig *pCfg) {
   tsNumOfTaskQueueThreads = cfgGetItem(pCfg, "numOfTaskQueueThreads")->i32;
   tsQueryPolicy = cfgGetItem(pCfg, "queryPolicy")->i32;
   tsEnableQueryHb = cfgGetItem(pCfg, "enableQueryHb")->bval;
-  tsEnableScience = cfgGetItem(pCfg, "enableScience")->bval;  
+  tsEnableScience = cfgGetItem(pCfg, "enableScience")->bval;
   tsQuerySmaOptimize = cfgGetItem(pCfg, "querySmaOptimize")->i32;
   tsQueryPlannerTrace = cfgGetItem(pCfg, "queryPlannerTrace")->bval;
   tsQueryNodeChunkSize = cfgGetItem(pCfg, "queryNodeChunkSize")->i32;
@@ -902,7 +905,8 @@ static int32_t taosSetServerCfg(SConfig *pCfg) {
   tsCheckpointInterval = cfgGetItem(pCfg, "checkpointInterval")->i64;
 
   tsFilterScalarMode = cfgGetItem(pCfg, "filterScalarMode")->bval;
-  
+  tsMaxStreamBackendCache = cfgGetItem(pCfg, "maxStreamBackendCache")->i32;
+
   GRANT_CFG_GET;
   return 0;
 }
diff --git a/source/dnode/vnode/src/tq/tq.c b/source/dnode/vnode/src/tq/tq.c
index 35055a00e3045e7989b02795e14e18adc4df08d8..7d75b3fb9a9bacf8038b57392be8ba46f78af75f 100644
--- a/source/dnode/vnode/src/tq/tq.c
+++ b/source/dnode/vnode/src/tq/tq.c
@@ -1291,13 +1291,15 @@ int32_t tqProcessTaskDispatchRsp(STQ* pTq, SRpcMsg* pMsg) {
   SStreamDispatchRsp* pRsp = POINTER_SHIFT(pMsg->pCont, sizeof(SMsgHead));
   int32_t             taskId = ntohl(pRsp->upstreamTaskId);
   SStreamTask*        pTask = streamMetaAcquireTask(pTq->pStreamMeta, taskId);
-  tqDebug("recv dispatch rsp, code:%x", pMsg->code);
+
+  int32_t vgId = pTq->pStreamMeta->vgId;
   if (pTask) {
     streamProcessDispatchRsp(pTask, pRsp, pMsg->code);
     streamMetaReleaseTask(pTq->pStreamMeta, pTask);
     return 0;
   } else {
-    return -1;
+    tqDebug("vgId:%d failed to handle the dispatch rsp, since find task:0x%x failed", vgId, taskId);
+    return TSDB_CODE_INVALID_MSG;
   }
 }
 
diff --git a/source/dnode/vnode/src/tq/tqSink.c b/source/dnode/vnode/src/tq/tqSink.c
index 0bd7d9a57b9ca19514e63f5a4c219c92f006d069..6e02d5e21b6b991c0d9af2588784dd0c256bf8e8 100644
--- a/source/dnode/vnode/src/tq/tqSink.c
+++ b/source/dnode/vnode/src/tq/tqSink.c
@@ -137,7 +137,7 @@ void tqSinkToTablePipeline(SStreamTask* pTask, void* vnode, int64_t ver, void* d
 
   int32_t blockSz = taosArrayGetSize(pBlocks);
 
-  tqDebug("vgId:%d, s-task:%s write results blocks:%d into table", TD_VID(pVnode), pTask->id.idStr, blockSz);
+  tqDebug("vgId:%d, s-task:%s write results %d blocks into table", TD_VID(pVnode), pTask->id.idStr, blockSz);
 
   void*   pBuf = NULL;
   SArray* tagArray = NULL;
@@ -482,17 +482,15 @@ void tqSinkToTablePipeline(SStreamTask* pTask, void* vnode, int64_t ver, void* d
       tEncoderClear(&encoder);
       tDestroySubmitReq(&submitReq, TSDB_MSG_FLG_ENCODE);
 
-      SRpcMsg msg = {
-          .msgType = TDMT_VND_SUBMIT,
-          .pCont = pBuf,
-          .contLen = len,
-      };
-
+      SRpcMsg msg = { .msgType = TDMT_VND_SUBMIT, .pCont = pBuf, .contLen = len };
       if (tmsgPutToQueue(&pVnode->msgCb, WRITE_QUEUE, &msg) != 0) {
         tqDebug("failed to put into write-queue since %s", terrstr());
       }
     }
   }
+
+  tqDebug("vgId:%d, s-task:%s write results completed", TD_VID(pVnode), pTask->id.idStr);
+
 _end:
   taosArrayDestroy(tagArray);
   taosArrayDestroy(pVals);
diff --git a/source/dnode/vnode/src/tsdb/tsdbRead.c b/source/dnode/vnode/src/tsdb/tsdbRead.c
index 362934ec848fc70b212c2271faa21024a900ec1a..7af0936bb57520bf9298c9358c2822f7e5d14bab 100644
--- a/source/dnode/vnode/src/tsdb/tsdbRead.c
+++ b/source/dnode/vnode/src/tsdb/tsdbRead.c
@@ -1121,6 +1121,27 @@ static int32_t getEndPosInDataBlock(STsdbReader* pReader, SBlockData* pBlockData
     endPos = doBinarySearchKey(pBlockData->aTSKEY, pBlock->nRow, pos, key, pReader->order);
   }
 
+  if ((pReader->verRange.maxVer >= pBlock->minVer && pReader->verRange.maxVer < pBlock->maxVer)||
+      (pReader->verRange.minVer <= pBlock->maxVer && pReader->verRange.minVer > pBlock->minVer)) {
+    int32_t i = endPos;
+
+    if (asc) {
+      for(; i >= 0; --i) {
+        if (pBlockData->aVersion[i] <= pReader->verRange.maxVer) {
+          break;
+        }
+      }
+    } else {
+      for(; i < pBlock->nRow; ++i) {
+        if (pBlockData->aVersion[i] >= pReader->verRange.minVer) {
+          break;
+        }
+      }
+    }
+
+    endPos = i;
+  }
+
   return endPos;
 }
 
@@ -1260,10 +1281,11 @@ static int32_t copyBlockDataToSDataBlock(STsdbReader* pReader) {
     return 0;
   }
 
+  // row index of dump info remain the initial position, let's find the appropriate start position.
   if ((pDumpInfo->rowIndex == 0 && asc) || (pDumpInfo->rowIndex == pBlock->nRow - 1 && (!asc))) {
-    if (asc && pReader->window.skey <= pBlock->minKey.ts) {
+    if (asc && pReader->window.skey <= pBlock->minKey.ts && pReader->verRange.minVer <= pBlock->minVer) {
       // pDumpInfo->rowIndex = 0;
-    } else if (!asc && pReader->window.ekey >= pBlock->maxKey.ts) {
+    } else if (!asc && pReader->window.ekey >= pBlock->maxKey.ts && pReader->verRange.maxVer >= pBlock->maxVer) {
       // pDumpInfo->rowIndex = pBlock->nRow - 1;
     } else {  // find the appropriate the start position in current block, and set it to be the current rowIndex
       int32_t pos = asc ? pBlock->nRow - 1 : 0;
@@ -1279,6 +1301,29 @@ static int32_t copyBlockDataToSDataBlock(STsdbReader* pReader) {
             pBlock->maxVer, pReader->idStr);
         return TSDB_CODE_INVALID_PARA;
       }
+
+      ASSERT(pReader->verRange.minVer <= pBlock->maxVer && pReader->verRange.maxVer >= pBlock->minVer);
+
+      // find the appropriate start position that satisfies the version requirement.
+      if ((pReader->verRange.maxVer >= pBlock->minVer && pReader->verRange.maxVer < pBlock->maxVer)||
+          (pReader->verRange.minVer <= pBlock->maxVer && pReader->verRange.minVer > pBlock->minVer)) {
+        int32_t i = pDumpInfo->rowIndex;
+        if (asc) {
+          for(; i < pBlock->nRow; ++i) {
+            if (pBlockData->aVersion[i] >= pReader->verRange.minVer) {
+              break;
+            }
+          }
+        } else {
+          for(; i >= 0; --i) {
+            if (pBlockData->aVersion[i] <= pReader->verRange.maxVer) {
+              break;
+            }
+          }
+        }
+
+        pDumpInfo->rowIndex = i;
+      }
     }
   }
 
@@ -1293,6 +1338,9 @@ static int32_t copyBlockDataToSDataBlock(STsdbReader* pReader) {
   int32_t dumpedRows = asc ? (endIndex - pDumpInfo->rowIndex) : (pDumpInfo->rowIndex - endIndex);
   if (dumpedRows > pReader->resBlockInfo.capacity) {  // output buffer check
     dumpedRows = pReader->resBlockInfo.capacity;
+  } else if (dumpedRows <= 0) {  // no qualified rows in current data block, abort directly.
+    setBlockAllDumped(pDumpInfo, pReader->window.ekey, pReader->order);
+    return TSDB_CODE_SUCCESS;
   }
 
   int32_t i = 0;
@@ -1848,7 +1896,7 @@ static bool isCleanFileDataBlock(STsdbReader* pReader, SFileDataBlockInfo* pBloc
   SDataBlockToLoadInfo info = {0};
   getBlockToLoadInfo(&info, pBlockInfo, pBlock, pScanInfo, keyInBuf, pLastBlockReader, pReader);
   bool isCleanFileBlock = !(info.overlapWithNeighborBlock || info.hasDupTs || info.overlapWithKeyInBuf ||
-                            info.overlapWithDelInfo || info.overlapWithLastBlock || info.partiallyRequired);
+                            info.overlapWithDelInfo || info.overlapWithLastBlock);
   return isCleanFileBlock;
 }
 
@@ -2809,7 +2857,7 @@ static int32_t buildComposedDataBlock(STsdbReader* pReader) {
     // it is a clean block, load it directly
     if (isCleanFileDataBlock(pReader, pBlockInfo, pBlock, pBlockScanInfo, keyInBuf, pLastBlockReader) &&
         pBlock->nRow <= pReader->resBlockInfo.capacity) {
-      if (asc || ((!asc) && (!hasDataInLastBlock(pLastBlockReader)))) {
+      if (asc || (!hasDataInLastBlock(pLastBlockReader))) {
         code = copyBlockDataToSDataBlock(pReader);
         if (code) {
           goto _end;
@@ -2828,7 +2876,7 @@ static int32_t buildComposedDataBlock(STsdbReader* pReader) {
     }
   }
 
-  SBlockData*         pBlockData = &pReader->status.fileBlockData;
+  SBlockData* pBlockData = &pReader->status.fileBlockData;
 
   while (1) {
     bool hasBlockData = false;
@@ -2842,7 +2890,7 @@ static int32_t buildComposedDataBlock(STsdbReader* pReader) {
 
         pDumpInfo->rowIndex += step;
 
-        SDataBlk* pBlock = getCurrentBlock(&pReader->status.blockIter);
+        pBlock = getCurrentBlock(&pReader->status.blockIter);
         if (pDumpInfo->rowIndex >= pBlock->nRow || pDumpInfo->rowIndex < 0) {
           pBlockInfo = getCurrentBlockInfo(&pReader->status.blockIter);  // NOTE: get the new block info
 
@@ -2870,7 +2918,7 @@ static int32_t buildComposedDataBlock(STsdbReader* pReader) {
 
     // currently loaded file data block is consumed
     if ((pBlockData->nRow > 0) && (pDumpInfo->rowIndex >= pBlockData->nRow || pDumpInfo->rowIndex < 0)) {
-      SDataBlk* pBlock = getCurrentBlock(&pReader->status.blockIter);
+      pBlock = getCurrentBlock(&pReader->status.blockIter);
       setBlockAllDumped(pDumpInfo, pBlock->maxKey.ts, pReader->order);
       break;
     }
diff --git a/source/libs/executor/src/executor.c b/source/libs/executor/src/executor.c
index fb35b211c9285a68136b315ac4b901fa356e06de..ed8a4f3a3bd31dca8971c1754f64134b666170cd 100644
--- a/source/libs/executor/src/executor.c
+++ b/source/libs/executor/src/executor.c
@@ -132,7 +132,8 @@ static int32_t doSetStreamBlock(SOperatorInfo* pOperator, void* input, size_t nu
     pOperator->status = OP_NOT_OPENED;
 
     SStreamScanInfo* pInfo = pOperator->info;
-    qDebug("s-task:%s set source blocks:%d", id, (int32_t)numOfBlocks);
+
+    qDebug("s-task:%s in this batch, all %d blocks need to be processed and dump results", id, (int32_t)numOfBlocks);
     ASSERT(pInfo->validBlockIndex == 0 && taosArrayGetSize(pInfo->pBlockLists) == 0);
 
     if (type == STREAM_INPUT__MERGED_SUBMIT) {
@@ -140,6 +141,7 @@ static int32_t doSetStreamBlock(SOperatorInfo* pOperator, void* input, size_t nu
         SPackedData* pReq = POINTER_SHIFT(input, i * sizeof(SPackedData));
         taosArrayPush(pInfo->pBlockLists, pReq);
       }
+
       pInfo->blockType = STREAM_INPUT__DATA_SUBMIT;
     } else if (type == STREAM_INPUT__DATA_SUBMIT) {
       taosArrayPush(pInfo->pBlockLists, input);
@@ -150,6 +152,7 @@ static int32_t doSetStreamBlock(SOperatorInfo* pOperator, void* input, size_t nu
         SPackedData  tmp = { .pDataBlock = pDataBlock };
         taosArrayPush(pInfo->pBlockLists, &tmp);
       }
+
       pInfo->blockType = STREAM_INPUT__DATA_BLOCK;
     } else {
       ASSERT(0);
diff --git a/source/libs/executor/src/scanoperator.c b/source/libs/executor/src/scanoperator.c
index 2d2f3770415ab7930fc42fbc167f7ccc6cf336c2..28abee43422f7c004932f778c704f329cbbb6a16 100644
--- a/source/libs/executor/src/scanoperator.c
+++ b/source/libs/executor/src/scanoperator.c
@@ -1797,9 +1797,10 @@ void streamScanOperatorDecode(void* pBuff, int32_t len, SStreamScanInfo* pInfo)
 
 static SSDataBlock* doStreamScan(SOperatorInfo* pOperator) {
   // NOTE: this operator does never check if current status is done or not
-  SExecTaskInfo*   pTaskInfo = pOperator->pTaskInfo;
-  SStorageAPI* pAPI = &pTaskInfo->storageAPI;
+  SExecTaskInfo* pTaskInfo = pOperator->pTaskInfo;
+  const char*    id = GET_TASKID(pTaskInfo);
 
+  SStorageAPI*     pAPI = &pTaskInfo->storageAPI;
   SStreamScanInfo* pInfo = pOperator->info;
 
   qDebug("stream scan started, %s", GET_TASKID(pTaskInfo));
@@ -1883,7 +1884,7 @@ static SSDataBlock* doStreamScan(SOperatorInfo* pOperator) {
     if (pInfo->pRecoverRes != NULL) {
       pInfo->blockRecoverContiCnt++;
       calBlockTbName(pInfo, pInfo->pRecoverRes);
-      if (pInfo->pUpdateInfo) {
+      if (!pInfo->igCheckUpdate && pInfo->pUpdateInfo) {
         if (pTaskInfo->streamInfo.recoverStep == STREAM_RECOVER_STEP__SCAN1) {
           TSKEY maxTs = pAPI->stateStore.updateInfoFillBlockData(pInfo->pUpdateInfo, pInfo->pRecoverRes, pInfo->primaryTsIndex);
           pInfo->twAggSup.maxTs = TMAX(pInfo->twAggSup.maxTs, maxTs);
@@ -1922,7 +1923,9 @@ FETCH_NEXT_BLOCK:
       return NULL;
     }
 
-    int32_t      current = pInfo->validBlockIndex++;
+    int32_t  current = pInfo->validBlockIndex++;
+    qDebug("process %d/%d input data blocks, %s", current, (int32_t) total, id);
+
     SPackedData* pPacked = taosArrayGet(pInfo->pBlockLists, current);
     SSDataBlock* pBlock = pPacked->pDataBlock;
     if (pBlock->info.parTbName[0]) {
@@ -2057,7 +2060,6 @@ FETCH_NEXT_BLOCK:
       return pInfo->pUpdateRes;
     }
 
-    const char*     id = GET_TASKID(pTaskInfo);
     SSDataBlock*    pBlock = pInfo->pRes;
     SDataBlockInfo* pBlockInfo = &pBlock->info;
     int32_t         totalBlocks = taosArrayGetSize(pInfo->pBlockLists);
diff --git a/source/libs/executor/src/timewindowoperator.c b/source/libs/executor/src/timewindowoperator.c
index aa0aa9799b188a466d42ba4ad3e093305703411a..2cdf9bb15c3c979814a49bff3244ca327bf13c6e 100644
--- a/source/libs/executor/src/timewindowoperator.c
+++ b/source/libs/executor/src/timewindowoperator.c
@@ -1623,7 +1623,7 @@ void initIntervalDownStream(SOperatorInfo* downstream, uint16_t type, SStreamInt
   SStreamScanInfo* pScanInfo = downstream->info;
   pScanInfo->windowSup.parentType = type;
   pScanInfo->windowSup.pIntervalAggSup = &pInfo->aggSup;
-  if (!pScanInfo->igCheckUpdate && !pScanInfo->pUpdateInfo) {
+  if (!pScanInfo->pUpdateInfo) {
     pScanInfo->pUpdateInfo = pAPI->updateInfoInitP(&pInfo->interval, pInfo->twAggSup.waterMark);
   }
 
@@ -2150,28 +2150,29 @@ static void doBuildPullDataBlock(SArray* array, int32_t* pIndex, SSDataBlock* pB
 }
 
 void processPullOver(SSDataBlock* pBlock, SHashObj* pMap, SInterval* pInterval) {
-  SColumnInfoData* pStartCol = taosArrayGet(pBlock->pDataBlock, START_TS_COLUMN_INDEX);
+  SColumnInfoData* pStartCol = taosArrayGet(pBlock->pDataBlock, CALCULATE_START_TS_COLUMN_INDEX);
   TSKEY*           tsData = (TSKEY*)pStartCol->pData;
-  SColumnInfoData* pEndCol = taosArrayGet(pBlock->pDataBlock, END_TS_COLUMN_INDEX);
+  SColumnInfoData* pEndCol = taosArrayGet(pBlock->pDataBlock, CALCULATE_END_TS_COLUMN_INDEX);
   TSKEY*           tsEndData = (TSKEY*)pEndCol->pData;
   SColumnInfoData* pGroupCol = taosArrayGet(pBlock->pDataBlock, GROUPID_COLUMN_INDEX);
   uint64_t*        groupIdData = (uint64_t*)pGroupCol->pData;
   int32_t          chId = getChildIndex(pBlock);
   for (int32_t i = 0; i < pBlock->info.rows; i++) {
     TSKEY winTs = tsData[i];
-    while (winTs < tsEndData[i]) {
+    while (winTs <= tsEndData[i]) {
       SWinKey winRes = {.ts = winTs, .groupId = groupIdData[i]};
       void*   chIds = taosHashGet(pMap, &winRes, sizeof(SWinKey));
       if (chIds) {
         SArray* chArray = *(SArray**)chIds;
         int32_t index = taosArraySearchIdx(chArray, &chId, compareInt32Val, TD_EQ);
         if (index != -1) {
-          qDebug("===stream===window %" PRId64 " delete child id %d", winRes.ts, chId);
+          qDebug("===stream===retrive window %" PRId64 " delete child id %d", winRes.ts, chId);
           taosArrayRemove(chArray, index);
           if (taosArrayGetSize(chArray) == 0) {
             // pull data is over
             taosArrayDestroy(chArray);
             taosHashRemove(pMap, &winRes, sizeof(SWinKey));
+            qDebug("===stream===retrive pull data over.window %" PRId64 , winRes.ts);
           }
         }
       }
diff --git a/source/libs/stream/src/stream.c b/source/libs/stream/src/stream.c
index d3e4b23ad17b6b6245e68e00f13c5307f7f19fb6..acc69c5a2b6a09dac76621eb7cacac461f78d1c1 100644
--- a/source/libs/stream/src/stream.c
+++ b/source/libs/stream/src/stream.c
@@ -126,14 +126,12 @@ int32_t streamTaskEnqueueBlocks(SStreamTask* pTask, const SStreamDispatchReq* pR
   if (pBlock == NULL) {
     streamTaskInputFail(pTask);
     status = TASK_INPUT_STATUS__FAILED;
-    qDebug("vgId:%d, s-task:%s failed to receive dispatch msg, reason: out of memory", pTask->pMeta->vgId,
+    qError("vgId:%d, s-task:%s failed to receive dispatch msg, reason: out of memory", pTask->pMeta->vgId,
            pTask->id.idStr);
   } else {
     int32_t code = tAppendDataToInputQueue(pTask, (SStreamQueueItem*)pBlock);
     // input queue is full, upstream is blocked now
     status = (code == TSDB_CODE_SUCCESS)? TASK_INPUT_STATUS__NORMAL:TASK_INPUT_STATUS__BLOCKED;
-
-
   }
 
   // rsp by input status
@@ -235,12 +233,11 @@ int32_t streamProcessDispatchMsg(SStreamTask* pTask, SStreamDispatchReq* pReq, S
 }
 
 int32_t streamProcessDispatchRsp(SStreamTask* pTask, SStreamDispatchRsp* pRsp, int32_t code) {
-  ASSERT(pRsp->inputStatus == TASK_OUTPUT_STATUS__NORMAL || pRsp->inputStatus == TASK_OUTPUT_STATUS__BLOCKED);
-  qDebug("s-task:%s receive dispatch rsp, code: %x", pTask->id.idStr, code);
+  qDebug("s-task:%s receive dispatch rsp, output status:%d code:%d", pTask->id.idStr, pRsp->inputStatus, code);
 
   if (pTask->outputType == TASK_OUTPUT__SHUFFLE_DISPATCH) {
     int32_t leftRsp = atomic_sub_fetch_32(&pTask->shuffleDispatcher.waitingRspCnt, 1);
-    qDebug("task %d is shuffle, left waiting rsp %d", pTask->id.taskId, leftRsp);
+    qDebug("s-task:%s is shuffle, left waiting rsp %d", pTask->id.idStr, leftRsp);
     if (leftRsp > 0) {
       return 0;
     }
@@ -248,13 +245,20 @@ int32_t streamProcessDispatchRsp(SStreamTask* pTask, SStreamDispatchRsp* pRsp, i
 
   int8_t old = atomic_exchange_8(&pTask->outputStatus, pRsp->inputStatus);
   ASSERT(old == TASK_OUTPUT_STATUS__WAIT);
+
+  // the input queue of the (down stream) task that receive the output data is full, so the TASK_INPUT_STATUS_BLOCKED is rsp
+  // todo we need to send EMPTY PACKAGE to detect if the input queue is available for output of upstream task, every 50 ms.
   if (pRsp->inputStatus == TASK_INPUT_STATUS__BLOCKED) {
     // TODO: init recover timer
-    ASSERT(0);
+    qError("s-task:%s inputQ of downstream task:0x%x is full, need to block output", pTask->id.idStr, pRsp->downstreamTaskId);
+
+    atomic_store_8(&pTask->outputStatus, TASK_OUTPUT_STATUS__NORMAL);
+    qError("s-task:%s ignore error, and reset task output status:%d", pTask->id.idStr, pTask->outputStatus);
+
     return 0;
   }
 
-  // continue dispatch one block to down stream in pipeline
+  // otherwise, continue dispatch the first block to down stream task in pipeline
   streamDispatchStreamBlock(pTask);
   return 0;
 }
@@ -304,23 +308,32 @@ int32_t tAppendDataToInputQueue(SStreamTask* pTask, SStreamQueueItem* pItem) {
       return -1;
     }
 
-    taosWriteQitem(pTask->inputQueue->queue, pItem);
+    int32_t code = taosWriteQitem(pTask->inputQueue->queue, pItem);
+    if (code != TSDB_CODE_SUCCESS) {
+      streamDataSubmitDestroy(px);
+      taosFreeQitem(pItem);
+      return code;
+    }
   } else if (type == STREAM_INPUT__DATA_BLOCK || type == STREAM_INPUT__DATA_RETRIEVE ||
              type == STREAM_INPUT__REF_DATA_BLOCK) {
-    if ((pTask->taskLevel == TASK_LEVEL__SOURCE) && (tInputQueueIsFull(pTask))) {
+    if (/*(pTask->taskLevel == TASK_LEVEL__SOURCE) && */(tInputQueueIsFull(pTask))) {
       qError("s-task:%s input queue is full, capacity:%d size:%d MiB, current(blocks:%d, size:%.2fMiB) abort",
              pTask->id.idStr, STREAM_TASK_INPUT_QUEUEU_CAPACITY, STREAM_TASK_INPUT_QUEUEU_CAPACITY_IN_SIZE, total,
              size);
       destroyStreamDataBlock((SStreamDataBlock*) pItem);
-      taosFreeQitem(pItem);
       return -1;
     }
 
     qDebug("s-task:%s data block enqueue, current(blocks:%d, size:%.2fMiB)", pTask->id.idStr, total, size);
-    taosWriteQitem(pTask->inputQueue->queue, pItem);
+    int32_t code = taosWriteQitem(pTask->inputQueue->queue, pItem);
+    if (code != TSDB_CODE_SUCCESS) {
+      destroyStreamDataBlock((SStreamDataBlock*) pItem);
+      return code;
+    }
   } else if (type == STREAM_INPUT__CHECKPOINT) {
     taosWriteQitem(pTask->inputQueue->queue, pItem);
   } else if (type == STREAM_INPUT__GET_RES) {
+    // use the default memory limit, refactor later.
     taosWriteQitem(pTask->inputQueue->queue, pItem);
     qDebug("s-task:%s data res enqueue, current(blocks:%d, size:%.2fMiB)", pTask->id.idStr, total, size);
   }
diff --git a/source/libs/stream/src/streamBackendRocksdb.c b/source/libs/stream/src/streamBackendRocksdb.c
index f7638a42ae7d79addd638f68b8601bdbc9161579..c8a6597badcbe1fa5124bbe8be9dd160516198f2 100644
--- a/source/libs/stream/src/streamBackendRocksdb.c
+++ b/source/libs/stream/src/streamBackendRocksdb.c
@@ -38,6 +38,15 @@ typedef struct {
   rocksdb_comparator_t**           pCompares;
 } RocksdbCfInst;
 
+uint32_t nextPow2(uint32_t x) {
+  x = x - 1;
+  x = x | (x >> 1);
+  x = x | (x >> 2);
+  x = x | (x >> 4);
+  x = x | (x >> 8);
+  x = x | (x >> 16);
+  return x + 1;
+}
 int32_t streamStateOpenBackendCf(void* backend, char* name, char** cfs, int32_t nCf);
 
 void destroyRocksdbCfInst(RocksdbCfInst* inst);
@@ -92,6 +101,8 @@ void* streamBackendInit(const char* path) {
   rocksdb_options_set_recycle_log_file_num(opts, 6);
   rocksdb_options_set_max_write_buffer_number(opts, 2);
   rocksdb_options_set_info_log_level(opts, 0);
+  uint32_t dbLimit = nextPow2(tsMaxStreamBackendCache);
+  rocksdb_options_set_db_write_buffer_size(opts, dbLimit << 20);
 
   pHandle->env = env;
   pHandle->dbOpt = opts;
diff --git a/source/libs/stream/src/streamDispatch.c b/source/libs/stream/src/streamDispatch.c
index 401a8b9e741904e89e751180f29f6b9aaa58ea3c..1e939cb071be63a0031e5fb32ee5ea8b1638fd13 100644
--- a/source/libs/stream/src/streamDispatch.c
+++ b/source/libs/stream/src/streamDispatch.c
@@ -510,14 +510,17 @@ int32_t streamDispatchStreamBlock(SStreamTask* pTask) {
   int8_t old =
       atomic_val_compare_exchange_8(&pTask->outputStatus, TASK_OUTPUT_STATUS__NORMAL, TASK_OUTPUT_STATUS__WAIT);
   if (old != TASK_OUTPUT_STATUS__NORMAL) {
-    qDebug("s-task:%s task wait for dispatch rsp, not dispatch now", pTask->id.idStr);
+    qDebug("s-task:%s task wait for dispatch rsp, not dispatch now, output status:%d", pTask->id.idStr, old);
     return 0;
   }
 
+  qDebug("s-task:%s start to dispatch msg, output status:%d", pTask->id.idStr, pTask->outputStatus);
+
   SStreamDataBlock* pDispatchedBlock = streamQueueNextItem(pTask->outputQueue);
   if (pDispatchedBlock == NULL) {
-    qDebug("s-task:%s stop dispatching since no output in output queue", pTask->id.idStr);
     atomic_store_8(&pTask->outputStatus, TASK_OUTPUT_STATUS__NORMAL);
+    qDebug("s-task:%s stop dispatching since no output in output queue, output status:%d", pTask->id.idStr,
+           pTask->outputStatus);
     return 0;
   }
 
@@ -527,6 +530,7 @@ int32_t streamDispatchStreamBlock(SStreamTask* pTask) {
   if (code != TSDB_CODE_SUCCESS) {
     streamQueueProcessFail(pTask->outputQueue);
     atomic_store_8(&pTask->outputStatus, TASK_OUTPUT_STATUS__NORMAL);
+    qDebug("s-task:%s failed to dispatch msg to downstream, output status:%d", pTask->id.idStr, pTask->outputStatus);
   }
 
   // this block can be freed only when it has been pushed to down stream.
diff --git a/source/libs/stream/src/streamExec.c b/source/libs/stream/src/streamExec.c
index 95b97e080a9fa45cc6c3b947bace1baefe102b8c..716b939e5f58cbc0b1c3b86069facf723af67d6e 100644
--- a/source/libs/stream/src/streamExec.c
+++ b/source/libs/stream/src/streamExec.c
@@ -16,9 +16,9 @@
 #include "streamInc.h"
 
 // maximum allowed processed block batches. One block may include several submit blocks
-#define MAX_STREAM_EXEC_BATCH_NUM 128
-#define MIN_STREAM_EXEC_BATCH_NUM 16
-#define MAX_STREAM_RESULT_DUMP_THRESHOLD  1000
+#define MAX_STREAM_EXEC_BATCH_NUM 32
+#define MIN_STREAM_EXEC_BATCH_NUM 8
+#define MAX_STREAM_RESULT_DUMP_THRESHOLD  100
 
 static int32_t updateCheckPointInfo (SStreamTask* pTask);
 
@@ -385,7 +385,7 @@ int32_t streamExecForAll(SStreamTask* pTask) {
 
     if (pTask->taskLevel == TASK_LEVEL__SINK) {
       ASSERT(pInput->type == STREAM_INPUT__DATA_BLOCK);
-      qDebug("s-task:%s sink node start to sink result. numOfBlocks:%d", pTask->id.idStr, batchSize);
+      qDebug("s-task:%s sink task start to sink %d blocks", pTask->id.idStr, batchSize);
       streamTaskOutputResultBlock(pTask, (SStreamDataBlock*)pInput);
       continue;
     }
diff --git a/source/libs/stream/src/streamState.c b/source/libs/stream/src/streamState.c
index ba24a581e9eebfc136660c52845a4e485f665346..71a21ac15071ad5ab859b74133f23776c1d58f24 100644
--- a/source/libs/stream/src/streamState.c
+++ b/source/libs/stream/src/streamState.c
@@ -1062,7 +1062,7 @@ _end:
 }
 
 int32_t streamStatePutParName(SStreamState* pState, int64_t groupId, const char tbname[TSDB_TABLE_NAME_LEN]) {
-  qWarn("try to write to cf parname");
+  qDebug("try to write to cf parname");
 #ifdef USE_ROCKSDB
   if (tSimpleHashGetSize(pState->parNameMap) > MAX_TABLE_NAME_NUM) {
     if (tSimpleHashGet(pState->parNameMap, &groupId, sizeof(int64_t)) == NULL) {