diff --git a/source/libs/stream/src/stream.c b/source/libs/stream/src/stream.c
index b53d6e9d1c..0578f77b8a 100644
--- a/source/libs/stream/src/stream.c
+++ b/source/libs/stream/src/stream.c
@@ -143,7 +143,26 @@ int32_t streamSchedExec(SStreamTask* pTask) {
   return 0;
 }
 
-static int32_t streamTaskAppendInputBlocks(SStreamTask* pTask, const SStreamDispatchReq* pReq, SRpcMsg* pRsp) {
+static int32_t buildDispatchRsp(const SStreamTask* pTask, const SStreamDispatchReq* pReq, int32_t status, void** pBuf) {
+   *pBuf = rpcMallocCont(sizeof(SMsgHead) + sizeof(SStreamDispatchRsp));
+  if (*pBuf == NULL) {
+    return TSDB_CODE_OUT_OF_MEMORY;
+  }
+
+  ((SMsgHead*)(*pBuf))->vgId = htonl(pReq->upstreamNodeId);
+  SStreamDispatchRsp* pDispatchRsp = POINTER_SHIFT((*pBuf), sizeof(SMsgHead));
+
+  pDispatchRsp->inputStatus = status;
+  pDispatchRsp->streamId = htobe64(pReq->streamId);
+  pDispatchRsp->upstreamNodeId = htonl(pReq->upstreamNodeId);
+  pDispatchRsp->upstreamTaskId = htonl(pReq->upstreamTaskId);
+  pDispatchRsp->downstreamNodeId = htonl(pTask->info.nodeId);
+  pDispatchRsp->downstreamTaskId = htonl(pTask->id.taskId);
+
+  return TSDB_CODE_SUCCESS;
+}
+
+static int32_t streamTaskAppendInputBlocks(SStreamTask* pTask, const SStreamDispatchReq* pReq) {
   int8_t status = 0;
 
   SStreamDataBlock* pBlock = createStreamBlockFromDispatchMsg(pReq, pReq->type, pReq->srcVgId);
@@ -158,23 +177,7 @@ static int32_t streamTaskAppendInputBlocks(SStreamTask* pTask, const SStreamDisp
     status = (code == TSDB_CODE_SUCCESS) ? TASK_INPUT_STATUS__NORMAL : TASK_INPUT_STATUS__BLOCKED;
   }
 
-  // rsp by input status
-  void* buf = rpcMallocCont(sizeof(SMsgHead) + sizeof(SStreamDispatchRsp));
-  ((SMsgHead*)buf)->vgId = htonl(pReq->upstreamNodeId);
-  SStreamDispatchRsp* pDispatchRsp = POINTER_SHIFT(buf, sizeof(SMsgHead));
-
-  pDispatchRsp->inputStatus = status;
-  pDispatchRsp->streamId = htobe64(pReq->streamId);
-  pDispatchRsp->upstreamNodeId = htonl(pReq->upstreamNodeId);
-  pDispatchRsp->upstreamTaskId = htonl(pReq->upstreamTaskId);
-  pDispatchRsp->downstreamNodeId = htonl(pTask->info.nodeId);
-  pDispatchRsp->downstreamTaskId = htonl(pTask->id.taskId);
-
-  pRsp->pCont = buf;
-  pRsp->contLen = sizeof(SMsgHead) + sizeof(SStreamDispatchRsp);
-  tmsgSendRsp(pRsp);
-
-  return (status == TASK_INPUT_STATUS__NORMAL) ? 0 : -1;
+  return status;
 }
 
 int32_t streamTaskEnqueueRetrieve(SStreamTask* pTask, SStreamRetrieveReq* pReq, SRpcMsg* pRsp) {
@@ -239,22 +242,36 @@ int32_t streamProcessDispatchMsg(SStreamTask* pTask, SStreamDispatchReq* pReq, S
   qDebug("s-task:%s receive dispatch msg from taskId:0x%x(vgId:%d), msgLen:%" PRId64, pTask->id.idStr,
          pReq->upstreamTaskId, pReq->upstreamNodeId, pReq->totalLen);
 
-  // Current task has received the checkpoint req from the upstream task, from which the message should all be blocked
-  if (pReq->type == STREAM_INPUT__CHECKPOINT_TRIGGER) {
-    streamTaskCloseUpstreamInput(pTask, pReq->upstreamTaskId);
-  }
+  int32_t status = 0;
 
-  streamTaskAppendInputBlocks(pTask, pReq, pRsp);
-  tDeleteStreamDispatchReq(pReq);
-
-  if (exec) {
-    if (streamTryExec(pTask) < 0) {
-      return -1;
-    }
+  SStreamChildEpInfo* pInfo = streamTaskGetUpstreamTaskEpInfo(pTask, pReq->upstreamTaskId);
+  if (!pInfo->dataAllowed) {
+    qWarn("s-task:%s data from task:0x%x is denied", pTask->id.idStr, pReq->upstreamTaskId);
+    status = TASK_INPUT_STATUS__BLOCKED;
   } else {
-    streamSchedExec(pTask);
+    // Current task has received the checkpoint req from the upstream task, from which the message should all be blocked
+    if (pReq->type == STREAM_INPUT__CHECKPOINT_TRIGGER) {
+      streamTaskCloseUpstreamInput(pTask, pReq->upstreamTaskId);
+      qDebug("s-task:%s close inputQ for upstream:0x%x", pTask->id.idStr, pReq->upstreamTaskId);
+    }
+
+    status = streamTaskAppendInputBlocks(pTask, pReq);
   }
 
+  {
+    // do send response with the input status
+    int32_t code = buildDispatchRsp(pTask, pReq, status, &pRsp->pCont);
+    if (code != TSDB_CODE_SUCCESS) {
+      // todo handle failure
+      return code;
+    }
+
+    pRsp->contLen = sizeof(SMsgHead) + sizeof(SStreamDispatchRsp);
+    tmsgSendRsp(pRsp);
+  }
+
+  tDeleteStreamDispatchReq(pReq);
+  streamSchedExec(pTask);
   return 0;
 }
 
@@ -262,10 +279,6 @@ int32_t streamProcessRunReq(SStreamTask* pTask) {
   if (streamTryExec(pTask) < 0) {
     return -1;
   }
-
-  /*if (pTask->dispatchType == TASK_OUTPUT__FIXED_DISPATCH || pTask->dispatchType == TASK_OUTPUT__SHUFFLE_DISPATCH) {*/
-  /*streamDispatchStreamBlock(pTask);*/
-  /*}*/
   return 0;
 }
 
@@ -380,7 +393,7 @@ void streamTaskCloseUpstreamInput(SStreamTask* pTask, int32_t taskId) {
   }
 }
 
-SStreamChildEpInfo * streamTaskGetUpstreamTaskEpInfo(SStreamTask* pTask, int32_t taskId) {
+SStreamChildEpInfo* streamTaskGetUpstreamTaskEpInfo(SStreamTask* pTask, int32_t taskId) {
   int32_t num = taosArrayGetSize(pTask->pUpstreamInfoList);
   for(int32_t i = 0; i < num; ++i) {
     SStreamChildEpInfo* pInfo = taosArrayGetP(pTask->pUpstreamInfoList, i);
diff --git a/source/libs/stream/src/streamCheckpoint.c b/source/libs/stream/src/streamCheckpoint.c
index 772500bc80..4ae7ea02b3 100644
--- a/source/libs/stream/src/streamCheckpoint.c
+++ b/source/libs/stream/src/streamCheckpoint.c
@@ -136,15 +136,31 @@ int32_t streamProcessCheckpointSourceReq(SStreamTask* pTask, SStreamCheckpointSo
   pTask->checkpointingId = pReq->checkpointId;
   pTask->checkpointNotReadyTasks = 1;
 
-  // 2. let's dispatch checkpoint msg to downstream task directly and do nothing else.
-  // 2. put the checkpoint block into inputQ, to make sure all blocks with less version have been handled by this task already.
+  // 2. let's dispatch checkpoint msg to downstream task directly and do nothing else. put the checkpoint block into
+  //    inputQ, to make sure all blocks with less version have been handled by this task already.
   return appendCheckpointIntoInputQ(pTask, STREAM_INPUT__CHECKPOINT_TRIGGER);
 }
 
+static int32_t continueDispatchCheckpointBlock(SStreamDataBlock* pBlock, SStreamTask* pTask) {
+  pBlock->srcTaskId = pTask->id.taskId;
+  pBlock->srcVgId = pTask->pMeta->vgId;
+
+  int32_t code = taosWriteQitem(pTask->outputQueue->queue, pBlock);
+  if (code == 0) {
+    streamDispatchStreamBlock(pTask);
+  }
+
+  streamFreeQitem((SStreamQueueItem*)pBlock);
+  return code;
+}
+
 int32_t streamProcessCheckpointBlock(SStreamTask* pTask, SStreamDataBlock* pBlock) {
   SSDataBlock* pDataBlock = taosArrayGet(pBlock->blocks, 0);
   int64_t checkpointId = pDataBlock->info.version;
 
+  const char* id = pTask->id.idStr;
+  int32_t code = TSDB_CODE_SUCCESS;
+
   // set the task status
   pTask->checkpointingId = checkpointId;
   pTask->status.taskStatus = TASK_STATUS__CK;
@@ -153,20 +169,9 @@ int32_t streamProcessCheckpointBlock(SStreamTask* pTask, SStreamDataBlock* pBloc
   int32_t taskLevel = pTask->info.taskLevel;
   if (taskLevel == TASK_LEVEL__SOURCE) {
     if (pTask->outputType == TASK_OUTPUT__FIXED_DISPATCH || pTask->outputType == TASK_OUTPUT__SHUFFLE_DISPATCH) {
-      pBlock->srcTaskId = pTask->id.taskId;
-      pBlock->srcVgId = pTask->pMeta->vgId;
-
-      qDebug("s-task:%s set childIdx:%d, and add checkpoint block into outputQ", pTask->id.idStr,
-             pTask->info.selfChildId);
-
-      int32_t code = taosWriteQitem(pTask->outputQueue->queue, pBlock);
-      if (code != 0) {  // todo failed to add it into the output queue, free it.
-        return code;
-      }
-
-      streamFreeQitem((SStreamQueueItem*)pBlock);
-      streamDispatchStreamBlock(pTask);
-    } else {  // only one task exists
+      qDebug("s-task:%s set childIdx:%d, and add checkpoint block into outputQ", id, pTask->info.selfChildId);
+      continueDispatchCheckpointBlock(pBlock, pTask);
+    } else {  // only one task exists, no need to dispatch downstream info
       streamProcessCheckpointReadyMsg(pTask);
     }
   } else if (taskLevel == TASK_LEVEL__SINK) {
@@ -176,7 +181,7 @@ int32_t streamProcessCheckpointBlock(SStreamTask* pTask, SStreamDataBlock* pBloc
 
     // update the child Id for downstream tasks
     streamAddCheckpointReadyMsg(pTask, pBlock->srcTaskId, pTask->info.selfChildId, checkpointId);
-    qDebug("s-task:%s sink task do checkpoint ready, send ready msg to upstream", pTask->id.idStr);
+    qDebug("s-task:%s sink task do checkpoint ready, send ready msg to upstream", id);
   } else {
     ASSERT(taosArrayGetSize(pTask->pUpstreamInfoList) > 0);
 
@@ -188,14 +193,13 @@ int32_t streamProcessCheckpointBlock(SStreamTask* pTask, SStreamDataBlock* pBloc
     int32_t num = taosArrayGetSize(pTask->pUpstreamInfoList);
     if (notReady > 0) {
       qDebug("s-task:%s received checkpoint block, idx:%d, %d upstream tasks not send checkpoint info yet, total:%d",
-             pTask->id.idStr, pTask->info.selfChildId, notReady, num);
-      return 0;
+             id, pTask->info.selfChildId, notReady, num);
+      return code;
     }
 
     qDebug(
-        "s-task:%s receive one checkpoint block, all %d upstream sent checkpoint msgs, dispatch checkpoint msg to "
-        "downstream",
-        pTask->id.idStr, num);
+        "s-task:%s process checkpoint block, all %d upstreams sent checkpoint msgs, dispatch checkpoint msg downstream",
+        id, num);
 
     // set the needed checked downstream tasks, only when all downstream tasks do checkpoint complete, this task
     // can start local checkpoint procedure
@@ -204,23 +208,10 @@ int32_t streamProcessCheckpointBlock(SStreamTask* pTask, SStreamDataBlock* pBloc
     // if all upstreams are ready for generating checkpoint, set the status to be TASK_STATUS__CK_READY
     // put the checkpoint block into inputQ, to make sure all blocks with less version have been handled by this task
     // already. And then, dispatch check point msg to all downstream tasks
-
-    {
-      pBlock->srcTaskId = pTask->id.taskId;
-      pBlock->srcVgId = pTask->pMeta->vgId;
-
-      ASSERT(pTask->outputType == TASK_OUTPUT__FIXED_DISPATCH || pTask->outputType == TASK_OUTPUT__SHUFFLE_DISPATCH);
-      int32_t code = taosWriteQitem(pTask->outputQueue->queue, pBlock);
-      if (code != 0) {  // todo failed to add it into the output queue, free it.
-        return code;
-      }
-
-      streamFreeQitem((SStreamQueueItem*)pBlock);
-      streamDispatchStreamBlock(pTask);
-    }
+    code = continueDispatchCheckpointBlock(pBlock, pTask);
   }
 
-  return 0;
+  return code;
 }
 
 /**
@@ -259,10 +250,12 @@ int32_t streamSaveTasks(SStreamMeta* pMeta, int64_t checkpointId) {
     int8_t prev = p->status.taskStatus;
     p->status.taskStatus = TASK_STATUS__NORMAL;
 
+    // save the task
     streamMetaSaveTask(pMeta, p);
-    qDebug("vgId:%d s-task:%s commit task status after checkpoint completed, checkpointId:%" PRId64 ", ver:%" PRId64
-           " currentVer:%" PRId64 ", status to be normal, prev:%s",
-           pMeta->vgId, p->id.idStr, checkpointId, p->chkInfo.checkpointVer, p->chkInfo.currentVer,
+    streamTaskOpenAllUpstreamInput(p);   // open inputQ for all upstream tasks
+    qDebug("vgId:%d s-task:%s level:%d commit task status after checkpoint completed, checkpointId:%" PRId64
+           ", Ver(saved):%" PRId64 " currentVer:%" PRId64 ", status to be normal, prev:%s",
+           pMeta->vgId, p->id.idStr, p->info.taskLevel, checkpointId, p->chkInfo.checkpointVer, p->chkInfo.currentVer,
            streamGetTaskStatusStr(prev));
   }
 
diff --git a/source/libs/stream/src/streamExec.c b/source/libs/stream/src/streamExec.c
index 08dc59dfd2..a07b775cb8 100644
--- a/source/libs/stream/src/streamExec.c
+++ b/source/libs/stream/src/streamExec.c
@@ -386,7 +386,7 @@ static void doSetStreamInputBlock(SStreamTask* pTask, const void* pInput, int64_
     qSetMultiStreamInput(pExecutor, &pSubmit->submit, 1, STREAM_INPUT__DATA_SUBMIT);
     qDebug("s-task:%s set submit blocks as source block completed, %p %p len:%d ver:%" PRId64, id, pSubmit,
            pSubmit->submit.msgStr, pSubmit->submit.msgLen, pSubmit->submit.ver);
-    ASSERT((*pVer) < pSubmit->submit.ver);
+    ASSERT((*pVer) <= pSubmit->submit.ver);
     (*pVer) = pSubmit->submit.ver;
 
   } else if (pItem->type == STREAM_INPUT__DATA_BLOCK || pItem->type == STREAM_INPUT__DATA_RETRIEVE) {
@@ -405,7 +405,7 @@ static void doSetStreamInputBlock(SStreamTask* pTask, const void* pInput, int64_
     qDebug("s-task:%s %p set (merged) submit blocks as a batch, numOfBlocks:%d, ver:%" PRId64, id, pTask, numOfBlocks,
            pMerged->ver);
     qSetMultiStreamInput(pExecutor, pBlockList->pData, numOfBlocks, STREAM_INPUT__MERGED_SUBMIT);
-    ASSERT((*pVer) < pMerged->ver);
+    ASSERT((*pVer) <= pMerged->ver);
     (*pVer) = pMerged->ver;
 
   } else if (pItem->type == STREAM_INPUT__REF_DATA_BLOCK) {
@@ -485,7 +485,7 @@ int32_t streamExecForAll(SStreamTask* pTask) {
     ASSERT(pTask->chkInfo.checkpointVer <= pTask->chkInfo.currentVer && ver <= pTask->chkInfo.checkpointVer);
 
     if (ver != pTask->chkInfo.checkpointVer) {
-      qDebug("s-task:%s update checkpoint ver from %" PRId64 " to %" PRId64, pTask->id.idStr, ver,
+      qDebug("s-task:%s update checkpointVer(unsaved) from %" PRId64 " to %" PRId64, pTask->id.idStr, ver,
              pTask->chkInfo.checkpointVer);
     }