diff --git a/include/common/tcommon.h b/include/common/tcommon.h
index 73ba0f47b8d3003f6f924db86be3b2830444be4d..1b32dc26f5cf34cf0b84da409ee3c62dd0778696 100644
--- a/include/common/tcommon.h
+++ b/include/common/tcommon.h
@@ -46,6 +46,7 @@ typedef enum EStreamType {
   STREAM_INVALID,
   STREAM_GET_ALL,
   STREAM_DELETE,
+  STREAM_RETRIEVE,
 } EStreamType;
 
 typedef struct {
diff --git a/include/common/tmsgdef.h b/include/common/tmsgdef.h
index bb5e903d1e6391d2ec6c80216a2bbf9f1b715d73..ba707b8f5e5d983c84560b6600738380eb57ef54 100644
--- a/include/common/tmsgdef.h
+++ b/include/common/tmsgdef.h
@@ -200,15 +200,14 @@ enum {
   TD_DEF_MSG_TYPE(TDMT_VND_ALTER_HASHRANGE, "alter-hashrange", NULL, NULL)
   TD_DEF_MSG_TYPE(TDMT_VND_COMPACT, "compact", NULL, NULL)
   TD_DEF_MSG_TYPE(TDMT_VND_DROP_TTL_TABLE, "drop-ttl-stb", NULL, NULL)
-  TD_NEW_MSG_SEG(TDMT_QND_MSG)
 
-  //shared by snode and vnode
   TD_NEW_MSG_SEG(TDMT_STREAM_MSG)
   TD_DEF_MSG_TYPE(TDMT_STREAM_TASK_DEPLOY, "stream-task-deploy", SStreamTaskDeployReq, SStreamTaskDeployRsp)
   TD_DEF_MSG_TYPE(TDMT_STREAM_TASK_DROP, "stream-task-drop", NULL, NULL)
   TD_DEF_MSG_TYPE(TDMT_STREAM_TASK_RUN, "stream-task-run", NULL, NULL)
   TD_DEF_MSG_TYPE(TDMT_STREAM_TASK_DISPATCH, "stream-task-dispatch", NULL, NULL)
   TD_DEF_MSG_TYPE(TDMT_STREAM_TASK_RECOVER, "stream-task-recover", NULL, NULL)
+  TD_DEF_MSG_TYPE(TDMT_STREAM_RETRIEVE, "stream-retrieve", NULL, NULL)
 
   TD_NEW_MSG_SEG(TDMT_SCH_MSG)
   TD_DEF_MSG_TYPE(TDMT_SCH_LINK_BROKEN, "link-broken", NULL, NULL)
diff --git a/include/libs/stream/tstream.h b/include/libs/stream/tstream.h
index ee599e8498e60a00391b68eaf06f0a467e65c3ae..684a605e18039530a9b79777bbb1443c18f973a7 100644
--- a/include/libs/stream/tstream.h
+++ b/include/libs/stream/tstream.h
@@ -77,7 +77,7 @@ typedef struct {
 typedef struct {
   int8_t type;
 
-  int32_t sourceVg;
+  int32_t srcVgId;
   int64_t sourceVer;
 
   SArray* blocks;  // SArray<SSDataBlock*>
@@ -145,11 +145,6 @@ void streamDataSubmitRefDec(SStreamDataSubmit* pDataSubmit);
 
 SStreamDataSubmit* streamSubmitRefClone(SStreamDataSubmit* pSubmit);
 
-#if 0
-int32_t streamDataBlockEncode(void** buf, const SStreamDataBlock* pOutput);
-void*   streamDataBlockDecode(const void* buf, SStreamDataBlock* pInput);
-#endif
-
 typedef struct {
   char* qmsg;
   // followings are not applicable to encoder and decoder
@@ -234,6 +229,13 @@ enum {
   TASK_TRIGGER_STATUS__ACTIVE,
 };
 
+typedef struct {
+  int32_t nodeId;
+  int32_t childId;
+  int32_t taskId;
+  SEpSet  epSet;
+} SStreamChildEpInfo;
+
 struct SStreamTask {
   int64_t streamId;
   int32_t taskId;
@@ -247,13 +249,16 @@ struct SStreamTask {
   int8_t  dispatchType;
   int16_t dispatchMsgType;
 
-  int8_t dataScan;
+  int8_t isDataScan;
 
   // node info
-  int32_t childId;
+  int32_t selfChildId;
   int32_t nodeId;
   SEpSet  epSet;
 
+  // children info
+  SArray* childEpInfo;  // SArray<SStreamChildEpInfo*>
+
   // exec
   STaskExec exec;
 
@@ -291,6 +296,9 @@ struct SStreamTask {
   SMsgCb* pMsgCb;
 };
 
+int32_t tEncodeStreamEpInfo(SEncoder* pEncoder, const SStreamChildEpInfo* pInfo);
+int32_t tDecodeStreamEpInfo(SDecoder* pDecoder, SStreamChildEpInfo* pInfo);
+
 SStreamTask* tNewSStreamTask(int64_t streamId);
 int32_t      tEncodeSStreamTask(SEncoder* pEncoder, const SStreamTask* pTask);
 int32_t      tDecodeSStreamTask(SDecoder* pDecoder, SStreamTask* pTask);
@@ -369,9 +377,9 @@ typedef struct {
 typedef struct {
   int64_t streamId;
   int32_t taskId;
-  int32_t sourceTaskId;
-  int32_t sourceVg;
-  int32_t sourceChildId;
+  int32_t dataSrcVgId;
+  int32_t upstreamTaskId;
+  int32_t upstreamChildId;
   int32_t upstreamNodeId;
 #if 0
   int64_t sourceVer;
@@ -387,6 +395,23 @@ typedef struct {
   int8_t  inputStatus;
 } SStreamDispatchRsp;
 
+typedef struct {
+  int64_t            streamId;
+  int32_t            srcTaskId;
+  int32_t            srcNodeId;
+  int32_t            dstTaskId;
+  int32_t            dstNodeId;
+  int32_t            retrieveLen;
+  SRetrieveTableRsp* pRetrieve;
+} SStreamRetrieveReq;
+
+typedef struct {
+  int64_t streamId;
+  int32_t childId;
+  int32_t rspFromTaskId;
+  int32_t rspToTaskId;
+} SStreamRetrieveRsp;
+
 typedef struct {
   int64_t streamId;
   int32_t taskId;
@@ -401,6 +426,7 @@ typedef struct {
 } SStreamTaskRecoverRsp;
 
 int32_t tDecodeStreamDispatchReq(SDecoder* pDecoder, SStreamDispatchReq* pReq);
+int32_t tDecodeStreamRetrieveReq(SDecoder* pDecoder, SStreamRetrieveReq* pReq);
 
 int32_t streamLaunchByWrite(SStreamTask* pTask, int32_t vgId);
 int32_t streamSetupTrigger(SStreamTask* pTask);
@@ -411,6 +437,9 @@ int32_t streamProcessDispatchRsp(SStreamTask* pTask, SStreamDispatchRsp* pRsp);
 int32_t streamProcessRecoverReq(SStreamTask* pTask, SStreamTaskRecoverReq* pReq, SRpcMsg* pMsg);
 int32_t streamProcessRecoverRsp(SStreamTask* pTask, SStreamTaskRecoverRsp* pRsp);
 
+int32_t streamProcessRetrieveReq(SStreamTask* pTask, SStreamRetrieveReq* pReq, SRpcMsg* pMsg);
+int32_t streamProcessRetrieveRsp(SStreamTask* pTask, SStreamRetrieveRsp* pRsp);
+
 #ifdef __cplusplus
 }
 #endif
diff --git a/source/dnode/mgmt/mgmt_snode/src/smHandle.c b/source/dnode/mgmt/mgmt_snode/src/smHandle.c
index e1ffc3bdb7f2b9ce509fef20b4a4847ac91689c3..7cb41ca77cb77f7069ab8e375cef64840b058615 100644
--- a/source/dnode/mgmt/mgmt_snode/src/smHandle.c
+++ b/source/dnode/mgmt/mgmt_snode/src/smHandle.c
@@ -101,6 +101,8 @@ SArray *smGetMsgHandles() {
   if (dmSetMgmtHandle(pArray, TDMT_STREAM_TASK_DISPATCH_RSP, smPutNodeMsgToSharedQueue, 1) == NULL) goto _OVER;
   if (dmSetMgmtHandle(pArray, TDMT_STREAM_TASK_RECOVER, smPutNodeMsgToSharedQueue, 1) == NULL) goto _OVER;
   if (dmSetMgmtHandle(pArray, TDMT_STREAM_TASK_RECOVER_RSP, smPutNodeMsgToSharedQueue, 1) == NULL) goto _OVER;
+  if (dmSetMgmtHandle(pArray, TDMT_STREAM_RETRIEVE, smPutNodeMsgToSharedQueue, 1) == NULL) goto _OVER;
+  if (dmSetMgmtHandle(pArray, TDMT_STREAM_RETRIEVE_RSP, smPutNodeMsgToSharedQueue, 1) == NULL) goto _OVER;
 
   code = 0;
 _OVER:
diff --git a/source/dnode/mgmt/mgmt_vnode/src/vmHandle.c b/source/dnode/mgmt/mgmt_vnode/src/vmHandle.c
index d9502ec8f34d73eab7c0870f15756349e9b167d4..00d83f0ad4d5632e66352014d52cfc56f7bd1bfc 100644
--- a/source/dnode/mgmt/mgmt_vnode/src/vmHandle.c
+++ b/source/dnode/mgmt/mgmt_vnode/src/vmHandle.c
@@ -359,6 +359,8 @@ SArray *vmGetMsgHandles() {
   if (dmSetMgmtHandle(pArray, TDMT_STREAM_TASK_DISPATCH_RSP, vmPutMsgToFetchQueue, 0) == NULL) goto _OVER;
   if (dmSetMgmtHandle(pArray, TDMT_STREAM_TASK_RECOVER, vmPutMsgToFetchQueue, 0) == NULL) goto _OVER;
   if (dmSetMgmtHandle(pArray, TDMT_STREAM_TASK_RECOVER_RSP, vmPutMsgToFetchQueue, 0) == NULL) goto _OVER;
+  if (dmSetMgmtHandle(pArray, TDMT_STREAM_RETRIEVE, vmPutMsgToFetchQueue, 0) == NULL) goto _OVER;
+  if (dmSetMgmtHandle(pArray, TDMT_STREAM_RETRIEVE_RSP, vmPutMsgToFetchQueue, 0) == NULL) goto _OVER;
 
   if (dmSetMgmtHandle(pArray, TDMT_VND_ALTER_REPLICA, vmPutMsgToWriteQueue, 0) == NULL) goto _OVER;
   if (dmSetMgmtHandle(pArray, TDMT_VND_ALTER_CONFIG, vmPutMsgToWriteQueue, 0) == NULL) goto _OVER;
diff --git a/source/dnode/mnode/impl/src/mndScheduler.c b/source/dnode/mnode/impl/src/mndScheduler.c
index 2b6258b10ab76772e69c7a6935c058a526e202f7..e055e3b2baecb75da527b18559e3e11f1b2cfa50 100644
--- a/source/dnode/mnode/impl/src/mndScheduler.c
+++ b/source/dnode/mnode/impl/src/mndScheduler.c
@@ -37,7 +37,7 @@ extern bool tsSchedStreamToSnode;
 
 static int32_t mndAddTaskToTaskSet(SArray* pArray, SStreamTask* pTask) {
   int32_t childId = taosArrayGetSize(pArray);
-  pTask->childId = childId;
+  pTask->selfChildId = childId;
   taosArrayPush(pArray, &pTask);
   return 0;
 }
@@ -270,6 +270,8 @@ int32_t mndAddShuffleSinkTasksToStream(SMnode* pMnode, STrans* pTrans, SStreamOb
     pTask->nodeId = pVgroup->vgId;
     pTask->epSet = mndGetVgroupEpset(pMnode, pVgroup);
 
+    pTask->isDataScan = 0;
+
     // source
     pTask->inputType = TASK_INPUT_TYPE__DATA_BLOCK;
 
@@ -306,6 +308,8 @@ int32_t mndAddFixedSinkTaskToStream(SMnode* pMnode, STrans* pTrans, SStreamObj*
   }
   mndAddTaskToTaskSet(tasks, pTask);
 
+  ASSERT(pStream->fixedSinkVg.vgId == pStream->fixedSinkVgId);
+
   pTask->nodeId = pStream->fixedSinkVgId;
 #if 0
   SVgObj* pVgroup = mndAcquireVgroup(pMnode, pStream->fixedSinkVgId);
@@ -315,6 +319,9 @@ int32_t mndAddFixedSinkTaskToStream(SMnode* pMnode, STrans* pTrans, SStreamObj*
   pTask->epSet = mndGetVgroupEpset(pMnode, pVgroup);
 #endif
   pTask->epSet = mndGetVgroupEpset(pMnode, &pStream->fixedSinkVg);
+
+  pTask->isDataScan = 0;
+
   // source
   pTask->inputType = TASK_INPUT_TYPE__DATA_BLOCK;
 
@@ -384,6 +391,11 @@ int32_t mndScheduleStream(SMnode* pMnode, STrans* pTrans, SStreamObj* pStream) {
 
       pInnerTask = tNewSStreamTask(pStream->uid);
       mndAddTaskToTaskSet(taskInnerLevel, pInnerTask);
+
+      pInnerTask->isDataScan = 0;
+
+      pInnerTask->childEpInfo = taosArrayInit(0, sizeof(void*));
+
       // input
       pInnerTask->inputType = TASK_INPUT_TYPE__DATA_BLOCK;
 
@@ -446,7 +458,7 @@ int32_t mndScheduleStream(SMnode* pMnode, STrans* pTrans, SStreamObj* pStream) {
       SStreamTask* pTask = tNewSStreamTask(pStream->uid);
       mndAddTaskToTaskSet(taskSourceLevel, pTask);
 
-      pTask->dataScan = 1;
+      pTask->isDataScan = 1;
 
       // input
       pTask->inputType = TASK_INPUT_TYPE__SUMBIT_BLOCK;
@@ -467,6 +479,20 @@ int32_t mndScheduleStream(SMnode* pMnode, STrans* pTrans, SStreamObj* pStream) {
         qDestroyQueryPlan(pPlan);
         return -1;
       }
+
+      SStreamChildEpInfo* pEpInfo = taosMemoryMalloc(sizeof(SStreamChildEpInfo));
+      if (pEpInfo == NULL) {
+        ASSERT(0);
+        terrno = TSDB_CODE_OUT_OF_MEMORY;
+        sdbRelease(pSdb, pVgroup);
+        qDestroyQueryPlan(pPlan);
+        return -1;
+      }
+      pEpInfo->childId = pTask->selfChildId;
+      pEpInfo->epSet = pTask->epSet;
+      pEpInfo->nodeId = pTask->nodeId;
+      pEpInfo->taskId = pTask->taskId;
+      taosArrayPush(pInnerTask->childEpInfo, &pEpInfo);
     }
   }
 
@@ -491,7 +517,7 @@ int32_t mndScheduleStream(SMnode* pMnode, STrans* pTrans, SStreamObj* pStream) {
       SStreamTask* pTask = tNewSStreamTask(pStream->uid);
       mndAddTaskToTaskSet(taskOneLevel, pTask);
 
-      pTask->dataScan = 1;
+      pTask->isDataScan = 1;
 
       // input
       pTask->inputType = TASK_INPUT_TYPE__SUMBIT_BLOCK;
diff --git a/source/dnode/snode/src/snode.c b/source/dnode/snode/src/snode.c
index c2c4ea3a88e1b690cc6b94c9ee15575e8ec004e1..3a92cba7731576658a8fa9edc9402c2c0e0ab068 100644
--- a/source/dnode/snode/src/snode.c
+++ b/source/dnode/snode/src/snode.c
@@ -105,13 +105,14 @@ static int32_t sndProcessTaskDeployReq(SSnode *pNode, SRpcMsg *pMsg) {
 
   ASSERT(pTask->execType != TASK_EXEC__NONE);
 
-  ASSERT(pTask->dataScan == 0);
+  ASSERT(pTask->isDataScan == 0);
   pTask->exec.executor = qCreateStreamExecTaskInfo(pTask->exec.qmsg, NULL);
   ASSERT(pTask->exec.executor);
 
   streamSetupTrigger(pTask);
 
-  qInfo("deploy stream: stream id %ld task id %d child id %d on snode", pTask->streamId, pTask->taskId, pTask->childId);
+  qInfo("deploy stream: stream id %ld task id %d child id %d on snode", pTask->streamId, pTask->taskId,
+        pTask->selfChildId);
 
   taosHashPut(pMeta->pHash, &pTask->taskId, sizeof(int32_t), &pTask, sizeof(void *));
 
@@ -198,6 +199,34 @@ static int32_t sndProcessTaskDropReq(SSnode *pNode, SRpcMsg *pMsg) {
   return code;
 }
 
+static int32_t sndProcessTaskRetrieveReq(SSnode *pNode, SRpcMsg *pMsg) {
+  SStreamMeta *pMeta = pNode->pMeta;
+
+  char              *msgStr = pMsg->pCont;
+  char              *msgBody = POINTER_SHIFT(msgStr, sizeof(SMsgHead));
+  int32_t            msgLen = pMsg->contLen - sizeof(SMsgHead);
+  SStreamRetrieveReq req;
+  SDecoder           decoder;
+  tDecoderInit(&decoder, msgBody, msgLen);
+  tDecodeStreamRetrieveReq(&decoder, &req);
+  int32_t      taskId = req.dstTaskId;
+  SStreamTask *pTask = *(SStreamTask **)taosHashGet(pMeta->pHash, &taskId, sizeof(int32_t));
+  if (atomic_load_8(&pTask->taskStatus) != TASK_STATUS__NORMAL) {
+    return 0;
+  }
+  SRpcMsg rsp = {
+      .info = pMsg->info,
+      .code = 0,
+  };
+  streamProcessRetrieveReq(pTask, &req, &rsp);
+  return 0;
+}
+
+static int32_t sndProcessTaskRetrieveRsp(SSnode *pNode, SRpcMsg *pMsg) {
+  //
+  return 0;
+}
+
 int32_t sndProcessUMsg(SSnode *pSnode, SRpcMsg *pMsg) {
   // stream deploy
   // stream stop/resume
@@ -221,10 +250,14 @@ int32_t sndProcessSMsg(SSnode *pSnode, SRpcMsg *pMsg) {
       return sndProcessTaskDispatchReq(pSnode, pMsg);
     case TDMT_STREAM_TASK_RECOVER:
       return sndProcessTaskRecoverReq(pSnode, pMsg);
+    case TDMT_STREAM_RETRIEVE:
+      return sndProcessTaskRecoverReq(pSnode, pMsg);
     case TDMT_STREAM_TASK_DISPATCH_RSP:
       return sndProcessTaskDispatchRsp(pSnode, pMsg);
     case TDMT_STREAM_TASK_RECOVER_RSP:
       return sndProcessTaskRecoverRsp(pSnode, pMsg);
+    case TDMT_STREAM_RETRIEVE_RSP:
+      return sndProcessTaskRecoverRsp(pSnode, pMsg);
     default:
       ASSERT(0);
   }
diff --git a/source/dnode/vnode/src/inc/vnodeInt.h b/source/dnode/vnode/src/inc/vnodeInt.h
index c0dfebb08f566e6a9e28d233c7dc7c8dd1a991ea..f8bdb63c861e23f483ebceaa4ad7459d23b134b6 100644
--- a/source/dnode/vnode/src/inc/vnodeInt.h
+++ b/source/dnode/vnode/src/inc/vnodeInt.h
@@ -149,6 +149,8 @@ int32_t tqProcessTaskDispatchReq(STQ* pTq, SRpcMsg* pMsg);
 int32_t tqProcessTaskRecoverReq(STQ* pTq, SRpcMsg* pMsg);
 int32_t tqProcessTaskDispatchRsp(STQ* pTq, SRpcMsg* pMsg);
 int32_t tqProcessTaskRecoverRsp(STQ* pTq, SRpcMsg* pMsg);
+int32_t tqProcessTaskRetrieveReq(STQ* pTq, SRpcMsg* pMsg);
+int32_t tqProcessTaskRetrieveRsp(STQ* pTq, SRpcMsg* pMsg);
 
 SSubmitReq* tdBlockToSubmit(const SArray* pBlocks, const STSchema* pSchema, bool createTb, int64_t suid,
                             const char* stbFullName, int32_t vgId);
diff --git a/source/dnode/vnode/src/tq/tq.c b/source/dnode/vnode/src/tq/tq.c
index 3ce02dc50ad61852ec84f0a0cc2da736610c0ff2..691548af7ad6bfd9142ddde87f860ddfc94f72da 100644
--- a/source/dnode/vnode/src/tq/tq.c
+++ b/source/dnode/vnode/src/tq/tq.c
@@ -441,7 +441,7 @@ int32_t tqProcessTaskDeployReq(STQ* pTq, char* msg, int32_t msgLen) {
   // exec
   if (pTask->execType != TASK_EXEC__NONE) {
     // expand runners
-    if (pTask->dataScan) {
+    if (pTask->isDataScan) {
       STqReadHandle* pStreamReader = tqInitSubmitMsgScanner(pTq->pVnode->pMeta);
       SReadHandle    handle = {
              .reader = pStreamReader,
@@ -476,7 +476,7 @@ int32_t tqProcessTaskDeployReq(STQ* pTq, char* msg, int32_t msgLen) {
 
   streamSetupTrigger(pTask);
 
-  tqInfo("deploy stream task id %d child id %d on vg %d", pTask->taskId, pTask->childId, TD_VID(pTq->pVnode));
+  tqInfo("deploy stream task id %d child id %d on vg %d", pTask->taskId, pTask->selfChildId, TD_VID(pTq->pVnode));
 
   taosHashPut(pTq->pStreamTasks, &pTask->taskId, sizeof(int32_t), &pTask, sizeof(void*));
 
@@ -616,3 +616,29 @@ int32_t tqProcessTaskDropReq(STQ* pTq, char* msg, int32_t msgLen) {
   return code;
 #endif
 }
+
+int32_t tqProcessTaskRetrieveReq(STQ* pTq, SRpcMsg* pMsg) {
+  char*              msgStr = pMsg->pCont;
+  char*              msgBody = POINTER_SHIFT(msgStr, sizeof(SMsgHead));
+  int32_t            msgLen = pMsg->contLen - sizeof(SMsgHead);
+  SStreamRetrieveReq req;
+  SDecoder           decoder;
+  tDecoderInit(&decoder, msgBody, msgLen);
+  tDecodeStreamRetrieveReq(&decoder, &req);
+  int32_t      taskId = req.dstTaskId;
+  SStreamTask* pTask = *(SStreamTask**)taosHashGet(pTq->pStreamTasks, &taskId, sizeof(int32_t));
+  if (atomic_load_8(&pTask->taskStatus) != TASK_STATUS__NORMAL) {
+    return 0;
+  }
+  SRpcMsg rsp = {
+      .info = pMsg->info,
+      .code = 0,
+  };
+  streamProcessRetrieveReq(pTask, &req, &rsp);
+  return 0;
+}
+
+int32_t tqProcessTaskRetrieveRsp(STQ* pTq, SRpcMsg* pMsg) {
+  //
+  return 0;
+}
diff --git a/source/dnode/vnode/src/vnd/vnodeSvr.c b/source/dnode/vnode/src/vnd/vnodeSvr.c
index e764aba48e4188430cfc67c3f2844689b077b089..3dd636e5a8d67b3c0aeccb1ff6056932723e0ca7 100644
--- a/source/dnode/vnode/src/vnd/vnodeSvr.c
+++ b/source/dnode/vnode/src/vnd/vnodeSvr.c
@@ -265,10 +265,14 @@ int32_t vnodeProcessFetchMsg(SVnode *pVnode, SRpcMsg *pMsg, SQueueInfo *pInfo) {
       return tqProcessTaskDispatchReq(pVnode->pTq, pMsg);
     case TDMT_STREAM_TASK_RECOVER:
       return tqProcessTaskRecoverReq(pVnode->pTq, pMsg);
+    case TDMT_STREAM_RETRIEVE:
+      return tqProcessTaskRetrieveReq(pVnode->pTq, pMsg);
     case TDMT_STREAM_TASK_DISPATCH_RSP:
       return tqProcessTaskDispatchRsp(pVnode->pTq, pMsg);
     case TDMT_STREAM_TASK_RECOVER_RSP:
       return tqProcessTaskRecoverRsp(pVnode->pTq, pMsg);
+    case TDMT_STREAM_RETRIEVE_RSP:
+      return tqProcessTaskRetrieveRsp(pVnode->pTq, pMsg);
     default:
       vError("unknown msg type:%d in fetch queue", pMsg->msgType);
       return TSDB_CODE_VND_APP_ERROR;
diff --git a/source/libs/stream/inc/streamInc.h b/source/libs/stream/inc/streamInc.h
index 8aaf4953def5d8fcb1fe354124c28f595649d8e1..9654e21d24a3768a69d8452715fd56fac73b2f2d 100644
--- a/source/libs/stream/inc/streamInc.h
+++ b/source/libs/stream/inc/streamInc.h
@@ -33,8 +33,13 @@ static SStreamGlobalEnv streamEnv;
 int32_t streamExec(SStreamTask* pTask, SMsgCb* pMsgCb);
 int32_t streamDispatch(SStreamTask* pTask, SMsgCb* pMsgCb);
 int32_t streamDispatchReqToData(const SStreamDispatchReq* pReq, SStreamDataBlock* pData);
+int32_t streamRetrieveReqToData(const SStreamRetrieveReq* pReq, SStreamDataBlock* pData);
 int32_t streamBuildDispatchMsg(SStreamTask* pTask, SStreamDataBlock* data, SRpcMsg* pMsg, SEpSet** ppEpSet);
 
+int32_t streamBroadcastToChildren(SStreamTask* pTask, const SSDataBlock* pBlock);
+
+int32_t tEncodeStreamRetrieveReq(SEncoder* pEncoder, const SStreamRetrieveReq* pReq);
+
 #ifdef __cplusplus
 }
 #endif
diff --git a/source/libs/stream/src/stream.c b/source/libs/stream/src/stream.c
index 18a6e5bf77a7e86fb503d115b51c7d17296bb323..9d92865e4780fc5f0f9ea78ab9fe7356e0c0c661 100644
--- a/source/libs/stream/src/stream.c
+++ b/source/libs/stream/src/stream.c
@@ -112,7 +112,7 @@ int32_t streamTaskEnqueue(SStreamTask* pTask, SStreamDispatchReq* pReq, SRpcMsg*
   // enqueue
   if (pData != NULL) {
     pData->type = STREAM_DATA_TYPE_SSDATA_BLOCK;
-    pData->sourceVg = pReq->sourceVg;
+    pData->srcVgId = pReq->dataSrcVgId;
     // decode
     /*pData->blocks = pReq->data;*/
     /*pBlock->sourceVer = pReq->sourceVer;*/
@@ -133,7 +133,42 @@ int32_t streamTaskEnqueue(SStreamTask* pTask, SStreamDispatchReq* pReq, SRpcMsg*
   SStreamDispatchRsp* pCont = POINTER_SHIFT(buf, sizeof(SMsgHead));
   pCont->inputStatus = status;
   pCont->streamId = pReq->streamId;
-  pCont->taskId = pReq->sourceTaskId;
+  pCont->taskId = pReq->upstreamTaskId;
+  pRsp->pCont = buf;
+  pRsp->contLen = sizeof(SMsgHead) + sizeof(SStreamDispatchRsp);
+  tmsgSendRsp(pRsp);
+  return status == TASK_INPUT_STATUS__NORMAL ? 0 : -1;
+}
+
+int32_t streamTaskEnqueueRetrieve(SStreamTask* pTask, SStreamRetrieveReq* pReq, SRpcMsg* pRsp) {
+  SStreamDataBlock* pData = taosAllocateQitem(sizeof(SStreamDataBlock), DEF_QITEM);
+  int8_t            status = TASK_INPUT_STATUS__NORMAL;
+
+  // enqueue
+  if (pData != NULL) {
+    pData->type = STREAM_DATA_TYPE_SSDATA_BLOCK;
+    pData->srcVgId = 0;
+    // decode
+    /*pData->blocks = pReq->data;*/
+    /*pBlock->sourceVer = pReq->sourceVer;*/
+    streamRetrieveReqToData(pReq, pData);
+    if (streamTaskInput(pTask, (SStreamQueueItem*)pData) == 0) {
+      status = TASK_INPUT_STATUS__NORMAL;
+    } else {
+      status = TASK_INPUT_STATUS__FAILED;
+    }
+  } else {
+    /*streamTaskInputFail(pTask);*/
+    /*status = TASK_INPUT_STATUS__FAILED;*/
+  }
+
+  // rsp by input status
+  void* buf = rpcMallocCont(sizeof(SMsgHead) + sizeof(SStreamRetrieveRsp));
+  ((SMsgHead*)buf)->vgId = htonl(pReq->srcNodeId);
+  SStreamRetrieveRsp* pCont = POINTER_SHIFT(buf, sizeof(SMsgHead));
+  pCont->streamId = pReq->streamId;
+  pCont->rspToTaskId = pReq->srcTaskId;
+  pCont->rspFromTaskId = pReq->dstTaskId;
   pRsp->pCont = buf;
   pRsp->contLen = sizeof(SMsgHead) + sizeof(SStreamDispatchRsp);
   tmsgSendRsp(pRsp);
@@ -141,7 +176,7 @@ int32_t streamTaskEnqueue(SStreamTask* pTask, SStreamDispatchReq* pReq, SRpcMsg*
 }
 
 int32_t streamProcessDispatchReq(SStreamTask* pTask, SStreamDispatchReq* pReq, SRpcMsg* pRsp) {
-  qInfo("task %d receive dispatch req from node %d task %d", pTask->taskId, pReq->upstreamNodeId, pReq->sourceTaskId);
+  qInfo("task %d receive dispatch req from node %d task %d", pTask->taskId, pReq->upstreamNodeId, pReq->upstreamTaskId);
 
   // 1. handle input
   streamTaskEnqueue(pTask, pReq, pRsp);
@@ -208,3 +243,22 @@ int32_t streamProcessRecoverRsp(SStreamTask* pTask, SStreamTaskRecoverRsp* pRsp)
   //
   return 0;
 }
+
+int32_t streamProcessRetrieveReq(SStreamTask* pTask, SStreamRetrieveReq* pReq, SRpcMsg* pRsp) {
+  qInfo("task %d receive retrieve req from node %d task %d", pTask->taskId, pReq->srcNodeId, pReq->srcTaskId);
+
+  streamTaskEnqueueRetrieve(pTask, pReq, pRsp);
+
+  ASSERT(pTask->execType != TASK_EXEC__NONE);
+  streamExec(pTask, pTask->pMsgCb);
+
+  ASSERT(pTask->dispatchType != TASK_DISPATCH__NONE);
+  streamDispatch(pTask, pTask->pMsgCb);
+
+  return 0;
+}
+
+int32_t streamProcessRetrieveRsp(SStreamTask* pTask, SStreamRetrieveRsp* pRsp) {
+  //
+  return 0;
+}
diff --git a/source/libs/stream/src/streamData.c b/source/libs/stream/src/streamData.c
index 6699e86b1e6137cd9f7a5f873d207c23a0cc09f9..ef328ecf848de7d0fdde0ab8780c9cefd62943bc 100644
--- a/source/libs/stream/src/streamData.c
+++ b/source/libs/stream/src/streamData.c
@@ -15,27 +15,6 @@
 
 #include "streamInc.h"
 
-#if 0
-int32_t streamDataBlockEncode(void** buf, const SStreamDataBlock* pOutput) {
-  int32_t tlen = 0;
-  tlen += taosEncodeFixedI8(buf, pOutput->type);
-  tlen += taosEncodeFixedI32(buf, pOutput->sourceVg);
-  tlen += taosEncodeFixedI64(buf, pOutput->sourceVer);
-  ASSERT(pOutput->type == STREAM_INPUT__DATA_BLOCK);
-  tlen += tEncodeDataBlocks(buf, pOutput->blocks);
-  return tlen;
-}
-
-void* streamDataBlockDecode(const void* buf, SStreamDataBlock* pInput) {
-  buf = taosDecodeFixedI8(buf, &pInput->type);
-  buf = taosDecodeFixedI32(buf, &pInput->sourceVg);
-  buf = taosDecodeFixedI64(buf, &pInput->sourceVer);
-  ASSERT(pInput->type == STREAM_INPUT__DATA_BLOCK);
-  buf = tDecodeDataBlocks(buf, &pInput->blocks);
-  return (void*)buf;
-}
-#endif
-
 int32_t streamDispatchReqToData(const SStreamDispatchReq* pReq, SStreamDataBlock* pData) {
   int32_t blockNum = pReq->blockNum;
   SArray* pArray = taosArrayInit(blockNum, sizeof(SSDataBlock));
@@ -54,8 +33,21 @@ int32_t streamDispatchReqToData(const SStreamDispatchReq* pReq, SStreamDataBlock
     blockCompressDecode(pDataBlock, htonl(pRetrieve->numOfCols), htonl(pRetrieve->numOfRows), pRetrieve->data);
     // TODO: refactor
     pDataBlock->info.type = pRetrieve->streamBlockType;
-    pDataBlock->info.childId = pReq->sourceChildId;
+    pDataBlock->info.childId = pReq->upstreamChildId;
+  }
+  pData->blocks = pArray;
+  return 0;
+}
+
+int32_t streamRetrieveReqToData(const SStreamRetrieveReq* pReq, SStreamDataBlock* pData) {
+  SArray* pArray = taosArrayInit(1, sizeof(SSDataBlock));
+  if (pArray == NULL) {
+    return -1;
   }
+  taosArraySetSize(pArray, 1);
+  SRetrieveTableRsp* pRetrieve = pReq->pRetrieve;
+  SSDataBlock*       pBlock = taosArrayGet(pArray, 0);
+  blockCompressDecode(pBlock, htonl(pRetrieve->numOfCols), htonl(pRetrieve->numOfRows), pRetrieve->data);
   pData->blocks = pArray;
   return 0;
 }
diff --git a/source/libs/stream/src/streamDispatch.c b/source/libs/stream/src/streamDispatch.c
index 1894f697c01d550fd4877d2dc533d527b4d51eb4..993fd3dbd7c5cfd0196063bb409c238b19b5b705 100644
--- a/source/libs/stream/src/streamDispatch.c
+++ b/source/libs/stream/src/streamDispatch.c
@@ -19,9 +19,9 @@ int32_t tEncodeStreamDispatchReq(SEncoder* pEncoder, const SStreamDispatchReq* p
   if (tStartEncode(pEncoder) < 0) return -1;
   if (tEncodeI64(pEncoder, pReq->streamId) < 0) return -1;
   if (tEncodeI32(pEncoder, pReq->taskId) < 0) return -1;
-  if (tEncodeI32(pEncoder, pReq->sourceTaskId) < 0) return -1;
-  if (tEncodeI32(pEncoder, pReq->sourceVg) < 0) return -1;
-  if (tEncodeI32(pEncoder, pReq->sourceChildId) < 0) return -1;
+  if (tEncodeI32(pEncoder, pReq->upstreamTaskId) < 0) return -1;
+  if (tEncodeI32(pEncoder, pReq->dataSrcVgId) < 0) return -1;
+  if (tEncodeI32(pEncoder, pReq->upstreamChildId) < 0) return -1;
   if (tEncodeI32(pEncoder, pReq->upstreamNodeId) < 0) return -1;
   if (tEncodeI32(pEncoder, pReq->blockNum) < 0) return -1;
   ASSERT(taosArrayGetSize(pReq->data) == pReq->blockNum);
@@ -40,9 +40,9 @@ int32_t tDecodeStreamDispatchReq(SDecoder* pDecoder, SStreamDispatchReq* pReq) {
   if (tStartDecode(pDecoder) < 0) return -1;
   if (tDecodeI64(pDecoder, &pReq->streamId) < 0) return -1;
   if (tDecodeI32(pDecoder, &pReq->taskId) < 0) return -1;
-  if (tDecodeI32(pDecoder, &pReq->sourceTaskId) < 0) return -1;
-  if (tDecodeI32(pDecoder, &pReq->sourceVg) < 0) return -1;
-  if (tDecodeI32(pDecoder, &pReq->sourceChildId) < 0) return -1;
+  if (tDecodeI32(pDecoder, &pReq->upstreamTaskId) < 0) return -1;
+  if (tDecodeI32(pDecoder, &pReq->dataSrcVgId) < 0) return -1;
+  if (tDecodeI32(pDecoder, &pReq->upstreamChildId) < 0) return -1;
   if (tDecodeI32(pDecoder, &pReq->upstreamNodeId) < 0) return -1;
   if (tDecodeI32(pDecoder, &pReq->blockNum) < 0) return -1;
   ASSERT(pReq->blockNum > 0);
@@ -62,6 +62,102 @@ int32_t tDecodeStreamDispatchReq(SDecoder* pDecoder, SStreamDispatchReq* pReq) {
   return 0;
 }
 
+int32_t tEncodeStreamRetrieveReq(SEncoder* pEncoder, const SStreamRetrieveReq* pReq) {
+  //
+  if (tStartEncode(pEncoder) < 0) return -1;
+  if (tEncodeI64(pEncoder, pReq->streamId) < 0) return -1;
+  if (tEncodeI32(pEncoder, pReq->dstNodeId) < 0) return -1;
+  if (tEncodeI32(pEncoder, pReq->dstTaskId) < 0) return -1;
+  if (tEncodeI32(pEncoder, pReq->srcNodeId) < 0) return -1;
+  if (tEncodeI32(pEncoder, pReq->srcTaskId) < 0) return -1;
+  if (tEncodeBinary(pEncoder, (const uint8_t*)&pReq->pRetrieve, pReq->retrieveLen) < 0) return -1;
+  tEndEncode(pEncoder);
+  return pEncoder->pos;
+}
+
+int32_t tDecodeStreamRetrieveReq(SDecoder* pDecoder, SStreamRetrieveReq* pReq) {
+  int32_t tlen = 0;
+  if (tStartDecode(pDecoder) < 0) return -1;
+  if (tDecodeI64(pDecoder, &pReq->streamId) < 0) return -1;
+  if (tDecodeI32(pDecoder, &pReq->dstNodeId) < 0) return -1;
+  if (tDecodeI32(pDecoder, &pReq->dstTaskId) < 0) return -1;
+  if (tDecodeI32(pDecoder, &pReq->srcNodeId) < 0) return -1;
+  if (tDecodeI32(pDecoder, &pReq->srcTaskId) < 0) return -1;
+  if (tDecodeBinary(pDecoder, (uint8_t**)&pReq->pRetrieve, &pReq->retrieveLen) < 0) return -1;
+  tEndDecode(pDecoder);
+  return 0;
+}
+
+int32_t streamBroadcastToChildren(SStreamTask* pTask, const SSDataBlock* pBlock) {
+  SRetrieveTableRsp* pRetrieve = NULL;
+  void*              buf = NULL;
+  int32_t            dataStrLen = sizeof(SRetrieveTableRsp) + blockGetEncodeSize(pBlock);
+
+  pRetrieve = taosMemoryCalloc(1, dataStrLen);
+  if (pRetrieve == NULL) return -1;
+
+  pRetrieve->useconds = 0;
+  pRetrieve->precision = TSDB_DEFAULT_PRECISION;
+  pRetrieve->compressed = 0;
+  pRetrieve->completed = 1;
+  pRetrieve->streamBlockType = pBlock->info.type;
+  pRetrieve->numOfRows = htonl(pBlock->info.rows);
+  pRetrieve->numOfCols = htonl(pBlock->info.numOfCols);
+
+  int32_t actualLen = 0;
+  blockCompressEncode(pBlock, pRetrieve->data, &actualLen, pBlock->info.numOfCols, false);
+
+  SStreamRetrieveReq req = {
+      .streamId = pTask->streamId,
+      .srcNodeId = pTask->nodeId,
+      .srcTaskId = pTask->taskId,
+      .pRetrieve = pRetrieve,
+  };
+
+  int32_t sz = taosArrayGetSize(pTask->childEpInfo);
+  ASSERT(sz > 0);
+  for (int32_t i = 0; i < sz; i++) {
+    SStreamChildEpInfo* pEpInfo = taosArrayGetP(pTask->childEpInfo, i);
+    req.dstNodeId = pEpInfo->nodeId;
+    req.dstTaskId = pEpInfo->taskId;
+    int32_t code;
+    int32_t len;
+    tEncodeSize(tEncodeStreamRetrieveReq, &req, len, code);
+    if (code < 0) {
+      ASSERT(0);
+      return -1;
+    }
+
+    buf = rpcMallocCont(sizeof(SMsgHead) + len);
+    if (buf == NULL) {
+      goto FAIL;
+    }
+
+    ((SMsgHead*)buf)->vgId = htonl(pEpInfo->nodeId);
+    void*    abuf = POINTER_SHIFT(buf, sizeof(SMsgHead));
+    SEncoder encoder;
+    tEncoderInit(&encoder, abuf, len);
+    tEncodeStreamRetrieveReq(&encoder, &req);
+
+    SRpcMsg rpcMsg = {
+        .code = 0,
+        .msgType = TDMT_STREAM_RETRIEVE,
+        .pCont = buf,
+        .contLen = len,
+    };
+
+    if (tmsgSendReq(&pEpInfo->epSet, &rpcMsg) < 0) {
+      ASSERT(0);
+      return -1;
+    }
+  }
+  return 0;
+FAIL:
+  if (pRetrieve) taosMemoryFree(pRetrieve);
+  if (buf) taosMemoryFree(buf);
+  return -1;
+}
+
 static int32_t streamAddBlockToDispatchMsg(const SSDataBlock* pBlock, SStreamDispatchReq* pReq) {
   int32_t dataStrLen = sizeof(SRetrieveTableRsp) + blockGetEncodeSize(pBlock);
   void*   buf = taosMemoryCalloc(1, dataStrLen);
@@ -94,9 +190,9 @@ int32_t streamBuildDispatchMsg(SStreamTask* pTask, SStreamDataBlock* data, SRpcM
 
   SStreamDispatchReq req = {
       .streamId = pTask->streamId,
-      .sourceTaskId = pTask->taskId,
-      .sourceVg = data->sourceVg,
-      .sourceChildId = pTask->childId,
+      .dataSrcVgId = data->srcVgId,
+      .upstreamTaskId = pTask->taskId,
+      .upstreamChildId = pTask->selfChildId,
       .upstreamNodeId = pTask->nodeId,
       .blockNum = blockNum,
   };
@@ -147,7 +243,7 @@ int32_t streamBuildDispatchMsg(SStreamTask* pTask, SStreamDataBlock* data, SRpcM
   ASSERT(vgId > 0 || vgId == SNODE_HANDLE);
   req.taskId = downstreamTaskId;
 
-  qInfo("dispatch from task %d (child id %d) to down stream task %d in vnode %d", pTask->taskId, pTask->childId,
+  qInfo("dispatch from task %d (child id %d) to down stream task %d in vnode %d", pTask->taskId, pTask->selfChildId,
         downstreamTaskId, vgId);
 
   // serialize
diff --git a/source/libs/stream/src/streamExec.c b/source/libs/stream/src/streamExec.c
index bab86223bf9270463897eb31602619645d8220df..4d9916e196d0359fad845abba4a7f2abefecb12b 100644
--- a/source/libs/stream/src/streamExec.c
+++ b/source/libs/stream/src/streamExec.c
@@ -13,8 +13,7 @@
  * along with this program. If not, see <http://www.gnu.org/licenses/>.
  */
 
-#include "executor.h"
-#include "tstream.h"
+#include "streamInc.h"
 
 static int32_t streamTaskExecImpl(SStreamTask* pTask, void* data, SArray* pRes) {
   void* exec = pTask->exec.executor;
@@ -46,9 +45,17 @@ static int32_t streamTaskExecImpl(SStreamTask* pTask, void* data, SArray* pRes)
       ASSERT(false);
     }
     if (output == NULL) break;
+
+    if (output->info.type == STREAM_RETRIEVE) {
+      if (streamBroadcastToChildren(pTask, output) < 0) {
+        // TODO
+      }
+      continue;
+    }
+
     // TODO: do we need free memory?
     SSDataBlock* outputCopy = createOneDataBlock(output, true);
-    outputCopy->info.childId = pTask->childId;
+    outputCopy->info.childId = pTask->selfChildId;
     taosArrayPush(pRes, outputCopy);
   }
   return 0;
diff --git a/source/libs/stream/src/streamTask.c b/source/libs/stream/src/streamTask.c
index 6dfaa4cb74f408eda641958167f6ba45c58dbdd3..8a7c425f79c7402d538ead4dd5b7d938249df0f8 100644
--- a/source/libs/stream/src/streamTask.c
+++ b/source/libs/stream/src/streamTask.c
@@ -30,6 +30,22 @@ SStreamTask* tNewSStreamTask(int64_t streamId) {
   return pTask;
 }
 
+int32_t tEncodeStreamEpInfo(SEncoder* pEncoder, const SStreamChildEpInfo* pInfo) {
+  if (tEncodeI32(pEncoder, pInfo->taskId) < 0) return -1;
+  if (tEncodeI32(pEncoder, pInfo->nodeId) < 0) return -1;
+  if (tEncodeI32(pEncoder, pInfo->childId) < 0) return -1;
+  if (tEncodeSEpSet(pEncoder, &pInfo->epSet) < 0) return -1;
+  return 0;
+}
+
+int32_t tDecodeStreamEpInfo(SDecoder* pDecoder, SStreamChildEpInfo* pInfo) {
+  if (tDecodeI32(pDecoder, &pInfo->taskId) < 0) return -1;
+  if (tDecodeI32(pDecoder, &pInfo->nodeId) < 0) return -1;
+  if (tDecodeI32(pDecoder, &pInfo->childId) < 0) return -1;
+  if (tDecodeSEpSet(pDecoder, &pInfo->epSet) < 0) return -1;
+  return 0;
+}
+
 int32_t tEncodeSStreamTask(SEncoder* pEncoder, const SStreamTask* pTask) {
   /*if (tStartEncode(pEncoder) < 0) return -1;*/
   if (tEncodeI64(pEncoder, pTask->streamId) < 0) return -1;
@@ -41,12 +57,19 @@ int32_t tEncodeSStreamTask(SEncoder* pEncoder, const SStreamTask* pTask) {
   if (tEncodeI8(pEncoder, pTask->sinkType) < 0) return -1;
   if (tEncodeI8(pEncoder, pTask->dispatchType) < 0) return -1;
   if (tEncodeI16(pEncoder, pTask->dispatchMsgType) < 0) return -1;
-  if (tEncodeI8(pEncoder, pTask->dataScan) < 0) return -1;
+  if (tEncodeI8(pEncoder, pTask->isDataScan) < 0) return -1;
 
-  if (tEncodeI32(pEncoder, pTask->childId) < 0) return -1;
+  if (tEncodeI32(pEncoder, pTask->selfChildId) < 0) return -1;
   if (tEncodeI32(pEncoder, pTask->nodeId) < 0) return -1;
   if (tEncodeSEpSet(pEncoder, &pTask->epSet) < 0) return -1;
 
+  int32_t epSz = taosArrayGetSize(pTask->childEpInfo);
+  if (tEncodeI32(pEncoder, epSz) < 0) return -1;
+  for (int32_t i = 0; i < epSz; i++) {
+    SStreamChildEpInfo* pInfo = taosArrayGetP(pTask->childEpInfo, i);
+    if (tEncodeStreamEpInfo(pEncoder, pInfo) < 0) return -1;
+  }
+
   if (pTask->execType != TASK_EXEC__NONE) {
     if (tEncodeCStr(pEncoder, pTask->exec.qmsg) < 0) return -1;
   }
@@ -90,12 +113,22 @@ int32_t tDecodeSStreamTask(SDecoder* pDecoder, SStreamTask* pTask) {
   if (tDecodeI8(pDecoder, &pTask->sinkType) < 0) return -1;
   if (tDecodeI8(pDecoder, &pTask->dispatchType) < 0) return -1;
   if (tDecodeI16(pDecoder, &pTask->dispatchMsgType) < 0) return -1;
-  if (tDecodeI8(pDecoder, &pTask->dataScan) < 0) return -1;
+  if (tDecodeI8(pDecoder, &pTask->isDataScan) < 0) return -1;
 
-  if (tDecodeI32(pDecoder, &pTask->childId) < 0) return -1;
+  if (tDecodeI32(pDecoder, &pTask->selfChildId) < 0) return -1;
   if (tDecodeI32(pDecoder, &pTask->nodeId) < 0) return -1;
   if (tDecodeSEpSet(pDecoder, &pTask->epSet) < 0) return -1;
 
+  int32_t epSz;
+  if (tDecodeI32(pDecoder, &epSz) < 0) return -1;
+  pTask->childEpInfo = taosArrayInit(epSz, sizeof(void*));
+  for (int32_t i = 0; i < epSz; i++) {
+    SStreamChildEpInfo* pInfo = taosMemoryCalloc(1, sizeof(SStreamChildEpInfo));
+    if (pInfo == NULL) return -1;
+    if (tDecodeStreamEpInfo(pDecoder, pInfo) < 0) return -1;
+    taosArrayPush(pTask->childEpInfo, &pInfo);
+  }
+
   if (pTask->execType != TASK_EXEC__NONE) {
     if (tDecodeCStrAlloc(pDecoder, &pTask->exec.qmsg) < 0) return -1;
   }