diff --git a/build.sh b/build.sh
old mode 100644
new mode 100755
diff --git a/include/libs/stream/tstream.h b/include/libs/stream/tstream.h
index 8aacfec397..9355d76dcb 100644
--- a/include/libs/stream/tstream.h
+++ b/include/libs/stream/tstream.h
@@ -154,7 +154,10 @@ static FORCE_INLINE void streamQueueProcessFail(SStreamQueue* queue) {
   atomic_store_8(&queue->status, STREAM_QUEUE__FAILED);
 }
 
-static FORCE_INLINE void* streamQueueCurItem(SStreamQueue* queue) { return queue->qItem; }
+static FORCE_INLINE void* streamQueueCurItem(SStreamQueue* queue) {
+  //
+  return queue->qItem;
+}
 
 static FORCE_INLINE void* streamQueueNextItem(SStreamQueue* queue) {
   int8_t dequeueFlag = atomic_exchange_8(&queue->status, STREAM_QUEUE__PROCESSING);
@@ -226,9 +229,7 @@ typedef struct {
   int32_t nodeId;
   int32_t childId;
   int32_t taskId;
-  // int64_t checkpointVer;
-  // int64_t processedVer;
-  SEpSet epSet;
+  SEpSet  epSet;
 } SStreamChildEpInfo;
 
 typedef struct {
@@ -372,15 +373,6 @@ static FORCE_INLINE int32_t streamTaskOutput(SStreamTask* pTask, SStreamDataBloc
   return 0;
 }
 
-typedef struct {
-  int32_t reserved;
-} SStreamTaskDeployRsp;
-
-typedef struct {
-  // SMsgHead     head;
-  SStreamTask* task;
-} SStreamTaskDeployReq;
-
 typedef struct {
   SMsgHead head;
   int64_t  streamId;
@@ -478,7 +470,18 @@ typedef struct {
 } SStreamRecoverDownstreamRsp;
 
 int32_t tEncodeSStreamTaskRecoverReq(SEncoder* pEncoder, const SStreamRecoverDownstreamReq* pReq);
-int32_t tDecodeSStreamTaskRecoverRsp(SDecoder* pDecoder, const SStreamRecoverDownstreamRsp* pRsp);
+int32_t tDecodeSStreamTaskRecoverReq(SDecoder* pDecoder, SStreamRecoverDownstreamReq* pReq);
+
+int32_t tEncodeSStreamTaskRecoverRsp(SEncoder* pEncoder, const SStreamRecoverDownstreamRsp* pRsp);
+int32_t tDecodeSStreamTaskRecoverRsp(SDecoder* pDecoder, SStreamRecoverDownstreamRsp* pRsp);
+
+typedef struct {
+  int64_t streamId;
+  int32_t taskId;
+  int32_t waitingRspCnt;
+  int32_t totReq;
+  SArray* info;  // SArray<SArray<SStreamCheckpointInfo>*>
+} SStreamRecoverStatus;
 
 int32_t tDecodeStreamDispatchReq(SDecoder* pDecoder, SStreamDispatchReq* pReq);
 int32_t tDecodeStreamRetrieveReq(SDecoder* pDecoder, SStreamRetrieveReq* pReq);
@@ -504,7 +507,7 @@ typedef struct SStreamMeta {
   TTB*         pTaskDb;
   TTB*         pStateDb;
   SHashObj*    pTasks;
-  SHashObj*    pRecoveringState;
+  SHashObj*    pRecoverStatus;
   void*        ahandle;
   TXN          txn;
   FTaskExpand* expandFunc;
diff --git a/include/libs/transport/trpc.h b/include/libs/transport/trpc.h
index 467f0a9ff0..655c903c0b 100644
--- a/include/libs/transport/trpc.h
+++ b/include/libs/transport/trpc.h
@@ -47,8 +47,6 @@ typedef struct SRpcHandleInfo {
   int8_t  persistHandle;  // persist handle or not
   int8_t  hasEpSet;
 
-  STraceId traceId;
-
   // app info
   void *ahandle;  // app handle set by client
   void *wrapper;  // wrapper handle
@@ -58,7 +56,8 @@ typedef struct SRpcHandleInfo {
   void   *rsp;
   int32_t rspLen;
 
-  // conn info
+  STraceId traceId;
+
   SRpcConnInfo conn;
 } SRpcHandleInfo;
 
diff --git a/include/util/tdef.h b/include/util/tdef.h
index f4e3385651..6fbec4bc67 100644
--- a/include/util/tdef.h
+++ b/include/util/tdef.h
@@ -396,7 +396,7 @@ typedef enum ELogicConditionType {
 #ifdef WINDOWS
 #define TSDB_MAX_RPC_THREADS 4  // windows pipe only support 4 connections.
 #else
-#define TSDB_MAX_RPC_THREADS 5
+#define TSDB_MAX_RPC_THREADS 10
 #endif
 
 #define TSDB_QUERY_TYPE_NON_TYPE      0x00u  // none type
diff --git a/source/common/src/systable.c b/source/common/src/systable.c
index 2a7c6ca471..ce80942356 100644
--- a/source/common/src/systable.c
+++ b/source/common/src/systable.c
@@ -74,7 +74,7 @@ static const SSysDbTableSchema clusterSchema[] = {
 static const SSysDbTableSchema userDBSchema[] = {
     {.name = "name", .bytes = SYSTABLE_SCH_DB_NAME_LEN, .type = TSDB_DATA_TYPE_VARCHAR},
     {.name = "create_time", .bytes = 8, .type = TSDB_DATA_TYPE_TIMESTAMP},
-    {.name = "vgroups", .bytes = 2, .type = TSDB_DATA_TYPE_SMALLINT},
+    {.name = "vgroups", .bytes = 4, .type = TSDB_DATA_TYPE_INT},
     {.name = "ntables", .bytes = 8, .type = TSDB_DATA_TYPE_BIGINT},
     {.name = "replica", .bytes = 1, .type = TSDB_DATA_TYPE_TINYINT},
     {.name = "strict", .bytes = TSDB_DB_STRICT_STR_LEN + VARSTR_HEADER_SIZE, .type = TSDB_DATA_TYPE_VARCHAR},
diff --git a/source/dnode/mnode/impl/src/mndDb.c b/source/dnode/mnode/impl/src/mndDb.c
index 8edfcad2c6..89ea7abc23 100644
--- a/source/dnode/mnode/impl/src/mndDb.c
+++ b/source/dnode/mnode/impl/src/mndDb.c
@@ -1706,7 +1706,10 @@ static void setPerfSchemaDbCfg(SDbObj *pDbObj) {
 static bool mndGetTablesOfDbFp(SMnode *pMnode, void *pObj, void *p1, void *p2, void *p3) {
   SVgObj  *pVgroup = pObj;
   int32_t *numOfTables = p1;
-  *numOfTables += pVgroup->numOfTables;
+  int64_t uid = *(int64_t*)p2;
+  if (pVgroup->dbUid == uid) {
+    *numOfTables += pVgroup->numOfTables;
+  }
   return true;
 }
 
@@ -1747,7 +1750,7 @@ static int32_t mndRetrieveDbs(SRpcMsg *pReq, SShowObj *pShow, SSDataBlock *pBloc
 
     if (mndCheckDbPrivilege(pMnode, pReq->info.conn.user, MND_OPER_READ_OR_WRITE_DB, pDb) == 0) {
       int32_t numOfTables = 0;
-      sdbTraverse(pSdb, SDB_VGROUP, mndGetTablesOfDbFp, &numOfTables, NULL, NULL);
+      sdbTraverse(pSdb, SDB_VGROUP, mndGetTablesOfDbFp, &numOfTables, &pDb->uid, NULL);
       mndDumpDbInfoData(pMnode, pBlock, pDb, pShow, numOfRows, numOfTables, false, objStatus, sysinfo);
       numOfRows++;
     }
diff --git a/source/libs/stream/inc/streamInc.h b/source/libs/stream/inc/streamInc.h
index 1ff27f1253..7dc8d822e9 100644
--- a/source/libs/stream/inc/streamInc.h
+++ b/source/libs/stream/inc/streamInc.h
@@ -33,7 +33,7 @@ typedef struct {
 static SStreamGlobalEnv streamEnv;
 
 int32_t streamExec(SStreamTask* pTask);
-int32_t streamPipelineExec(SStreamTask* pTask, int32_t batchNum);
+int32_t streamPipelineExec(SStreamTask* pTask, int32_t batchNum, bool dispatch);
 
 int32_t streamDispatch(SStreamTask* pTask);
 int32_t streamDispatchReqToData(const SStreamDispatchReq* pReq, SStreamDataBlock* pData);
diff --git a/source/libs/stream/src/stream.c b/source/libs/stream/src/stream.c
index 1f8d742de4..6da7d4fd59 100644
--- a/source/libs/stream/src/stream.c
+++ b/source/libs/stream/src/stream.c
@@ -104,7 +104,7 @@ int32_t streamSchedExec(SStreamTask* pTask) {
   return 0;
 }
 
-int32_t streamTaskEnqueue(SStreamTask* pTask, SStreamDispatchReq* pReq, SRpcMsg* pRsp) {
+int32_t streamTaskEnqueue(SStreamTask* pTask, const SStreamDispatchReq* pReq, SRpcMsg* pRsp) {
   SStreamDataBlock* pData = taosAllocateQitem(sizeof(SStreamDataBlock), DEF_QITEM);
   int8_t            status;
 
@@ -136,7 +136,6 @@ int32_t streamTaskEnqueue(SStreamTask* pTask, SStreamDispatchReq* pReq, SRpcMsg*
   pRsp->pCont = buf;
   pRsp->contLen = sizeof(SMsgHead) + sizeof(SStreamDispatchRsp);
   tmsgSendRsp(pRsp);
-  tFreeStreamDispatchReq(pReq);
   return status == TASK_INPUT_STATUS__NORMAL ? 0 : -1;
 }
 
@@ -183,6 +182,7 @@ int32_t streamProcessDispatchReq(SStreamTask* pTask, SStreamDispatchReq* pReq, S
          pReq->upstreamTaskId);
 
   streamTaskEnqueue(pTask, pReq, pRsp);
+  tFreeStreamDispatchReq(pReq);
 
   if (exec) {
     streamTryExec(pTask);
@@ -246,24 +246,20 @@ int32_t streamProcessRecoverReq(SStreamTask* pTask, SStreamTaskRecoverReq* pReq,
   return 0;
 }
 
-int32_t streamProcessRecoverRsp(SStreamTask* pTask, SStreamTaskRecoverRsp* pRsp) {
-  if (pRsp->inputStatus == TASK_INPUT_STATUS__NORMAL) {
-    pTask->outputStatus = TASK_OUTPUT_STATUS__NORMAL;
+int32_t streamProcessRecoverRsp(SStreamMeta* pMeta, SStreamTask* pTask, SStreamRecoverDownstreamRsp* pRsp) {
+  streamProcessRunReq(pTask);
 
-    streamProcessRunReq(pTask);
-
-    if (pTask->taskLevel == TASK_LEVEL__SOURCE) {
-      // scan data to recover
-      pTask->inputStatus = TASK_INPUT_STATUS__RECOVER;
-      pTask->taskStatus = TASK_STATUS__RECOVERING;
-      qStreamPrepareRecover(pTask->exec.executor, pTask->startVer, pTask->recoverSnapVer);
-      if (streamPipelineExec(pTask, 100) < 0) {
-        return -1;
-      }
-    } else {
-      pTask->inputStatus = TASK_INPUT_STATUS__NORMAL;
-      pTask->taskStatus = TASK_STATUS__NORMAL;
+  if (pTask->taskLevel == TASK_LEVEL__SOURCE) {
+    // scan data to recover
+    pTask->inputStatus = TASK_INPUT_STATUS__RECOVER;
+    pTask->taskStatus = TASK_STATUS__RECOVER_SELF;
+    qStreamPrepareRecover(pTask->exec.executor, pTask->startVer, pTask->recoverSnapVer);
+    if (streamPipelineExec(pTask, 100, true) < 0) {
+      return -1;
     }
+  } else {
+    pTask->inputStatus = TASK_INPUT_STATUS__NORMAL;
+    pTask->taskStatus = TASK_STATUS__NORMAL;
   }
 
   return 0;
diff --git a/source/libs/stream/src/streamExec.c b/source/libs/stream/src/streamExec.c
index ffb7c04bf2..72249c5181 100644
--- a/source/libs/stream/src/streamExec.c
+++ b/source/libs/stream/src/streamExec.c
@@ -93,7 +93,7 @@ static FORCE_INLINE int32_t streamUpdateVer(SStreamTask* pTask, SStreamDataBlock
 }
 #endif
 
-int32_t streamPipelineExec(SStreamTask* pTask, int32_t batchNum) {
+int32_t streamPipelineExec(SStreamTask* pTask, int32_t batchNum, bool dispatch) {
   ASSERT(pTask->taskLevel != TASK_LEVEL__SINK);
 
   void* exec = pTask->exec.executor;
@@ -125,24 +125,26 @@ int32_t streamPipelineExec(SStreamTask* pTask, int32_t batchNum) {
       taosArrayDestroy(pRes);
       break;
     }
-    SStreamDataBlock* qRes = taosAllocateQitem(sizeof(SStreamDataBlock), DEF_QITEM);
-    if (qRes == NULL) {
-      taosArrayDestroyEx(pRes, (FDelete)blockDataFreeRes);
-      return -1;
-    }
+    if (dispatch) {
+      SStreamDataBlock* qRes = taosAllocateQitem(sizeof(SStreamDataBlock), DEF_QITEM);
+      if (qRes == NULL) {
+        taosArrayDestroyEx(pRes, (FDelete)blockDataFreeRes);
+        return -1;
+      }
 
-    qRes->type = STREAM_INPUT__DATA_BLOCK;
-    qRes->blocks = pRes;
-    qRes->childId = pTask->selfChildId;
+      qRes->type = STREAM_INPUT__DATA_BLOCK;
+      qRes->blocks = pRes;
+      qRes->childId = pTask->selfChildId;
 
-    if (streamTaskOutput(pTask, qRes) < 0) {
-      taosArrayDestroyEx(pRes, (FDelete)blockDataFreeRes);
-      taosFreeQitem(qRes);
-      return -1;
-    }
+      if (streamTaskOutput(pTask, qRes) < 0) {
+        taosArrayDestroyEx(pRes, (FDelete)blockDataFreeRes);
+        taosFreeQitem(qRes);
+        return -1;
+      }
 
-    if (pTask->outputType == TASK_OUTPUT__FIXED_DISPATCH || pTask->outputType == TASK_OUTPUT__SHUFFLE_DISPATCH) {
-      streamDispatch(pTask);
+      if (pTask->outputType == TASK_OUTPUT__FIXED_DISPATCH || pTask->outputType == TASK_OUTPUT__SHUFFLE_DISPATCH) {
+        streamDispatch(pTask);
+      }
     }
   }
 
diff --git a/source/libs/stream/src/streamRecover.c b/source/libs/stream/src/streamRecover.c
index b2a7e00877..263053778b 100644
--- a/source/libs/stream/src/streamRecover.c
+++ b/source/libs/stream/src/streamRecover.c
@@ -132,6 +132,49 @@ int32_t tDecodeSStreamMultiVgCheckpointInfo(SDecoder* pDecoder, SStreamMultiVgCh
   return 0;
 }
 
+int32_t tEncodeSStreamTaskRecoverReq(SEncoder* pEncoder, const SStreamRecoverDownstreamReq* pReq) {
+  if (tEncodeI64(pEncoder, pReq->streamId) < 0) return -1;
+  if (tEncodeI32(pEncoder, pReq->downstreamTaskId) < 0) return -1;
+  if (tEncodeI32(pEncoder, pReq->taskId) < 0) return -1;
+  return 0;
+}
+
+int32_t tDecodeSStreamTaskRecoverReq(SDecoder* pDecoder, SStreamRecoverDownstreamReq* pReq) {
+  if (tDecodeI64(pDecoder, &pReq->streamId) < 0) return -1;
+  if (tDecodeI32(pDecoder, &pReq->downstreamTaskId) < 0) return -1;
+  if (tDecodeI32(pDecoder, &pReq->taskId) < 0) return -1;
+  return 0;
+}
+
+int32_t tEncodeSStreamTaskRecoverRsp(SEncoder* pEncoder, const SStreamRecoverDownstreamRsp* pRsp) {
+  if (tEncodeI64(pEncoder, pRsp->streamId) < 0) return -1;
+  if (tEncodeI32(pEncoder, pRsp->downstreamTaskId) < 0) return -1;
+  if (tEncodeI32(pEncoder, pRsp->taskId) < 0) return -1;
+  int32_t sz = taosArrayGetSize(pRsp->checkpointVer);
+  if (tEncodeI32(pEncoder, sz) < 0) return -1;
+  for (int32_t i = 0; i < sz; i++) {
+    SStreamCheckpointInfo* pInfo = taosArrayGet(pRsp->checkpointVer, i);
+    if (tEncodeSStreamCheckpointInfo(pEncoder, pInfo) < 0) return -1;
+  }
+  return 0;
+}
+
+int32_t tDecodeSStreamTaskRecoverRsp(SDecoder* pDecoder, SStreamRecoverDownstreamRsp* pRsp) {
+  if (tDecodeI64(pDecoder, &pRsp->streamId) < 0) return -1;
+  if (tDecodeI32(pDecoder, &pRsp->downstreamTaskId) < 0) return -1;
+  if (tDecodeI32(pDecoder, &pRsp->taskId) < 0) return -1;
+  int32_t sz;
+  if (tDecodeI32(pDecoder, &sz) < 0) return -1;
+  pRsp->checkpointVer = taosArrayInit(sz, sizeof(SStreamCheckpointInfo));
+  if (pRsp->checkpointVer == NULL) return -1;
+  for (int32_t i = 0; i < sz; i++) {
+    SStreamCheckpointInfo info;
+    if (tDecodeSStreamCheckpointInfo(pDecoder, &info) < 0) return -1;
+    taosArrayPush(pRsp->checkpointVer, &info);
+  }
+  return 0;
+}
+
 int32_t streamSaveStateInfo(SStreamMeta* pMeta, SStreamTask* pTask) {
   void* buf = NULL;
 
@@ -223,25 +266,129 @@ int32_t streamSaveAggLevel(SStreamMeta* pMeta, SStreamTask* pTask) {
   return 0;
 }
 
-int32_t streamFetchDownstreamStatus(SStreamTask* pTask) {
+int32_t streamFetchRecoverStatus(SStreamTask* pTask, const SVgroupInfo* pVgInfo) {
+  int32_t                     taskId = pVgInfo->taskId;
+  int32_t                     nodeId = pVgInfo->vgId;
+  SStreamRecoverDownstreamReq req = {
+      .streamId = pTask->taskId,
+      .downstreamTaskId = taskId,
+      .taskId = pTask->taskId,
+  };
+  int32_t tlen;
+  int32_t code;
+  tEncodeSize(tEncodeSStreamTaskRecoverReq, &req, tlen, code);
+  if (code < 0) {
+    return -1;
+  }
+  void* buf = taosMemoryCalloc(1, sizeof(SMsgHead) + tlen);
+  if (buf == NULL) {
+    return -1;
+  }
+  void*    abuf = POINTER_SHIFT(buf, sizeof(SMsgHead));
+  SEncoder encoder;
+  tEncoderInit(&encoder, abuf, tlen);
+  if (tEncodeSStreamTaskRecoverReq(&encoder, &req) < 0) {
+    tEncoderClear(&encoder);
+    taosMemoryFree(buf);
+    return -1;
+  }
+  tEncoderClear(&encoder);
+
+  ((SMsgHead*)buf)->vgId = htonl(nodeId);
+  SRpcMsg msg = {
+      .pCont = buf, .contLen = sizeof(SMsgHead) + tlen,
+      /*.msgType = */
+  };
+  tmsgSendReq(&pVgInfo->epSet, &msg);
+
+  return 0;
+}
+
+int32_t streamFetchDownstreamStatus(SStreamMeta* pMeta, SStreamTask* pTask) {
   // set self status to recover_phase1
-  // build fetch status msg
-  // send fetch msg
+  SStreamRecoverStatus* pRecover;
   atomic_store_8(&pTask->taskStatus, TASK_STATUS__RECOVER_DOWNSTREAM);
+  pRecover = taosHashGet(pMeta->pRecoverStatus, &pTask->taskId, sizeof(int32_t));
+  if (pRecover == NULL) {
+    pRecover = taosMemoryCalloc(1, sizeof(SStreamRecoverStatus));
+    if (pRecover == NULL) {
+      return -1;
+    }
+    pRecover->info = taosArrayInit(0, sizeof(void*));
+    if (pRecover->info == NULL) {
+      taosMemoryFree(pRecover);
+      return -1;
+    }
+    taosHashPut(pMeta->pRecoverStatus, &pTask->taskId, sizeof(int32_t), &pRecover, sizeof(void*));
+  }
 
   if (pTask->outputType == TASK_OUTPUT__FIXED_DISPATCH) {
+    pRecover->totReq = 1;
   } else if (pTask->outputType == TASK_OUTPUT__SHUFFLE_DISPATCH) {
+    int32_t numOfDownstream = taosArrayGetSize(pTask->shuffleDispatcher.dbInfo.pVgroupInfos);
+    pRecover->totReq = numOfDownstream;
+    for (int32_t i = 0; i < numOfDownstream; i++) {
+      SVgroupInfo* pVgInfo = taosArrayGet(pTask->shuffleDispatcher.dbInfo.pVgroupInfos, i);
+      streamFetchRecoverStatus(pTask, pVgInfo);
+    }
   } else {
     ASSERT(0);
   }
   return 0;
 }
 
-int32_t streamProcessFetchStatusRsp(SStreamMeta* pMeta, SStreamTask* pTask, void* msg) {
+int32_t streamProcessFetchStatusRsp(SStreamMeta* pMeta, SStreamTask* pTask, SStreamRecoverDownstreamRsp* pRsp) {
   // if failed, set timer and retry
   // if successful
-  // add rsp state to partial recover hash
-  // if complete, begin actual recover
+  int32_t               taskId = pTask->taskId;
+  SStreamRecoverStatus* pRecover = taosHashGet(pMeta->pRecoverStatus, &taskId, sizeof(int32_t));
+  if (pRecover == NULL) {
+    return -1;
+  }
+
+  taosArrayPush(pRecover->info, &pRsp->checkpointVer);
+
+  int32_t leftRsp = atomic_sub_fetch_32(&pRecover->waitingRspCnt, 1);
+  ASSERT(leftRsp >= 0);
+
+  if (leftRsp == 0) {
+    ASSERT(taosArrayGetSize(pRecover->info) == pRecover->totReq);
+
+    // srcNodeId -> SStreamCheckpointInfo*
+    SHashObj* pFinalChecks = taosHashInit(64, taosGetDefaultHashFunction(TSDB_DATA_TYPE_INT), false, HASH_NO_LOCK);
+    if (pFinalChecks == NULL) return -1;
+
+    for (int32_t i = 0; i < pRecover->totReq; i++) {
+      SArray* pChecks = taosArrayGetP(pRecover->info, i);
+      int32_t sz = taosArrayGetSize(pChecks);
+      for (int32_t j = 0; j < sz; j++) {
+        SStreamCheckpointInfo* pOneCheck = taosArrayGet(pChecks, j);
+        SStreamCheckpointInfo* pCheck = taosHashGet(pFinalChecks, &pOneCheck->srcNodeId, sizeof(int32_t));
+        if (pCheck == NULL) {
+          pCheck = taosMemoryCalloc(1, sizeof(SStreamCheckpointInfo));
+          pCheck->srcNodeId = pOneCheck->srcNodeId;
+          pCheck->srcChildId = pOneCheck->srcChildId;
+          pCheck->stateProcessedVer = pOneCheck->stateProcessedVer;
+          taosHashPut(pFinalChecks, &pCheck->srcNodeId, sizeof(int32_t), &pCheck, sizeof(void*));
+        } else {
+          pCheck->stateProcessedVer = TMIN(pCheck->stateProcessedVer, pOneCheck->stateProcessedVer);
+        }
+      }
+    }
+    // load local state
+    //
+    // recover
+    //
+    if (pTask->taskLevel == TASK_LEVEL__SOURCE) {
+      qStreamPrepareRecover(pTask->exec.executor, pTask->startVer, pTask->recoverSnapVer);
+      if (streamPipelineExec(pTask, 10000, true) < 0) {
+        return -1;
+      }
+    }
+    taosHashCleanup(pFinalChecks);
+    taosHashRemove(pMeta->pRecoverStatus, &taskId, sizeof(int32_t));
+    atomic_store_8(&pTask->taskStatus, TASK_STATUS__NORMAL);
+  }
   return 0;
 }
 
diff --git a/source/libs/transport/inc/transComm.h b/source/libs/transport/inc/transComm.h
index a9326ca429..04b58da570 100644
--- a/source/libs/transport/inc/transComm.h
+++ b/source/libs/transport/inc/transComm.h
@@ -128,7 +128,7 @@ typedef struct {
 
   int8_t retryCnt;
   int8_t retryLimit;
-  // bool       setMaxRetry;
+
   STransCtx  appCtx;  //
   STransMsg* pRsp;    // for synchronous API
   tsem_t*    pSem;    // for synchronous API
@@ -195,17 +195,7 @@ typedef enum { ConnNormal, ConnAcquire, ConnRelease, ConnBroken, ConnInPool } Co
 
 #define transLabel(trans) ((STrans*)trans)->label
 
-// int  rpcAuthenticateMsg(void* pMsg, int msgLen, void* pAuth, void* pKey);
-// void rpcBuildAuthHead(void* pMsg, int msgLen, void* pAuth, void* pKey);
-//// int32_t rpcCompressRpcMsg(char* pCont, int32_t contLen);
-//
-// int  transAuthenticateMsg(void* pMsg, int msgLen, void* pAuth, void* pKey);
-// void transBuildAuthHead(void* pMsg, int msgLen, void* pAuth, void* pKey);
-// bool transCompressMsg(char* msg, int32_t len, int32_t* flen);
-// bool transDecompressMsg(char* msg, int32_t len, int32_t* flen);
-
 void transFreeMsg(void* msg);
-
 //
 typedef struct SConnBuffer {
   char* buf;
@@ -322,8 +312,8 @@ void* transCtxDumpBrokenlinkVal(STransCtx* ctx, int32_t* msgType);
 
 // request list
 typedef struct STransReq {
-  queue q;
-  void* data;
+  queue      q;
+  uv_write_t wreq;
 } STransReq;
 
 void  transReqQueueInit(queue* q);
diff --git a/source/libs/transport/src/transCli.c b/source/libs/transport/src/transCli.c
index 31d567a2ed..47d47d3dbe 100644
--- a/source/libs/transport/src/transCli.c
+++ b/source/libs/transport/src/transCli.c
@@ -16,7 +16,8 @@
 #include "transComm.h"
 
 typedef struct SConnList {
-  queue conn;
+  queue   conn;
+  int32_t size;
 } SConnList;
 
 typedef struct SCliConn {
@@ -339,8 +340,8 @@ void cliHandleResp(SCliConn* conn) {
       tDebug("%s conn %p stop timer", CONN_GET_INST_LABEL(conn), conn);
       uv_timer_stop(conn->timer);
     }
-    conn->timer->data = NULL;
     taosArrayPush(pThrd->timerList, &conn->timer);
+    conn->timer->data = NULL;
     conn->timer = NULL;
   }
 
@@ -510,7 +511,7 @@ static SCliConn* getConnFromPool(void* pool, char* ip, uint32_t port) {
   SHashObj*  pPool = pool;
   SConnList* plist = taosHashGet(pPool, key, strlen(key));
   if (plist == NULL) {
-    SConnList list;
+    SConnList list = {0};
     taosHashPut(pPool, key, strlen(key), (void*)&list, sizeof(list));
     plist = taosHashGet(pPool, key, strlen(key));
     QUEUE_INIT(&plist->conn);
@@ -519,15 +520,18 @@ static SCliConn* getConnFromPool(void* pool, char* ip, uint32_t port) {
   if (QUEUE_IS_EMPTY(&plist->conn)) {
     return NULL;
   }
+
+  plist->size -= 1;
   queue*    h = QUEUE_HEAD(&plist->conn);
   SCliConn* conn = QUEUE_DATA(h, SCliConn, q);
   conn->status = ConnNormal;
   QUEUE_REMOVE(&conn->q);
   QUEUE_INIT(&conn->q);
 
-  transDQCancel(((SCliThrd*)conn->hostThrd)->timeoutQueue, conn->task);
-  conn->task = NULL;
-
+  if (conn->task != NULL) {
+    transDQCancel(((SCliThrd*)conn->hostThrd)->timeoutQueue, conn->task);
+    conn->task = NULL;
+  }
   return conn;
 }
 static void addConnToPool(void* pool, SCliConn* conn) {
@@ -539,6 +543,13 @@ static void addConnToPool(void* pool, SCliConn* conn) {
 
   allocConnRef(conn, true);
 
+  if (conn->timer != NULL) {
+    uv_timer_stop(conn->timer);
+    taosArrayPush(thrd->timerList, &conn->timer);
+    conn->timer->data = NULL;
+    conn->timer = NULL;
+  }
+
   STrans* pTransInst = thrd->pTransInst;
   cliReleaseUnfinishedMsg(conn);
   transQueueClear(&conn->cliMsgs);
@@ -556,13 +567,17 @@ static void addConnToPool(void* pool, SCliConn* conn) {
   assert(conn->list != NULL);
   QUEUE_INIT(&conn->q);
   QUEUE_PUSH(&conn->list->conn, &conn->q);
+  conn->list->size += 1;
 
+  conn->task = NULL;
   assert(!QUEUE_IS_EMPTY(&conn->list->conn));
 
-  STaskArg* arg = taosMemoryCalloc(1, sizeof(STaskArg));
-  arg->param1 = conn;
-  arg->param2 = thrd;
-  conn->task = transDQSched(thrd->timeoutQueue, doCloseIdleConn, arg, CONN_PERSIST_TIME(pTransInst->idleTime));
+  if (conn->list->size >= 50) {
+    STaskArg* arg = taosMemoryCalloc(1, sizeof(STaskArg));
+    arg->param1 = conn;
+    arg->param2 = thrd;
+    conn->task = transDQSched(thrd->timeoutQueue, doCloseIdleConn, arg, CONN_PERSIST_TIME(pTransInst->idleTime));
+  }
 }
 static int32_t allocConnRef(SCliConn* conn, bool update) {
   if (update) {
@@ -1374,7 +1389,7 @@ int transReleaseCliHandle(void* handle) {
   }
 
   STransMsg tmsg = {.info.handle = handle};
-  TRACE_SET_MSGID(&tmsg.info.traceId, tGenIdPI64());
+  // TRACE_SET_MSGID(&tmsg.info.traceId, tGenIdPI64());
 
   SCliMsg* cmsg = taosMemoryCalloc(1, sizeof(SCliMsg));
   cmsg->msg = tmsg;
@@ -1415,7 +1430,6 @@ int transSendRequest(void* shandle, const SEpSet* pEpSet, STransMsg* pReq, STran
   if (ctx != NULL) {
     pCtx->appCtx = *ctx;
   }
-  assert(pTransInst->connType == TAOS_CONN_CLIENT);
 
   SCliMsg* cliMsg = taosMemoryCalloc(1, sizeof(SCliMsg));
   cliMsg->ctx = pCtx;
diff --git a/source/libs/transport/src/transComm.c b/source/libs/transport/src/transComm.c
index ed694e120a..b568163e23 100644
--- a/source/libs/transport/src/transComm.c
+++ b/source/libs/transport/src/transComm.c
@@ -23,33 +23,6 @@ static TdThreadOnce transModuleInit = PTHREAD_ONCE_INIT;
 static int32_t refMgt;
 static int32_t instMgt;
 
-int transAuthenticateMsg(void* pMsg, int msgLen, void* pAuth, void* pKey) {
-  T_MD5_CTX context;
-  int       ret = -1;
-
-  tMD5Init(&context);
-  tMD5Update(&context, (uint8_t*)pKey, TSDB_PASSWORD_LEN);
-  tMD5Update(&context, (uint8_t*)pMsg, msgLen);
-  tMD5Update(&context, (uint8_t*)pKey, TSDB_PASSWORD_LEN);
-  tMD5Final(&context);
-
-  if (memcmp(context.digest, pAuth, sizeof(context.digest)) == 0) ret = 0;
-
-  return ret;
-}
-
-void transBuildAuthHead(void* pMsg, int msgLen, void* pAuth, void* pKey) {
-  T_MD5_CTX context;
-
-  tMD5Init(&context);
-  tMD5Update(&context, (uint8_t*)pKey, TSDB_PASSWORD_LEN);
-  tMD5Update(&context, (uint8_t*)pMsg, msgLen);
-  tMD5Update(&context, (uint8_t*)pKey, TSDB_PASSWORD_LEN);
-  tMD5Final(&context);
-
-  memcpy(pAuth, context.digest, sizeof(context.digest));
-}
-
 bool transCompressMsg(char* msg, int32_t len, int32_t* flen) {
   return false;
   // SRpcHead* pHead = rpcHeadFromCont(pCont);
@@ -176,7 +149,6 @@ int transAllocBuffer(SConnBuffer* connBuf, uv_buf_t* uvBuf) {
    * info--->|
    */
   SConnBuffer* p = connBuf;
-
   uvBuf->base = p->buf + p->len;
   if (p->left == -1) {
     uvBuf->len = p->cap - p->len;
@@ -184,7 +156,8 @@ int transAllocBuffer(SConnBuffer* connBuf, uv_buf_t* uvBuf) {
     if (p->left < p->cap - p->len) {
       uvBuf->len = p->left;
     } else {
-      p->buf = taosMemoryRealloc(p->buf, p->left + p->len);
+      p->cap = p->left + p->len;
+      p->buf = taosMemoryRealloc(p->buf, p->cap);
       uvBuf->base = p->buf + p->len;
       uvBuf->len = p->left;
     }
@@ -266,14 +239,9 @@ int transAsyncSend(SAsyncPool* pool, queue* q) {
   uv_async_t* async = &(pool->asyncs[idx]);
   SAsyncItem* item = async->data;
 
-  int64_t st = taosGetTimestampUs();
   taosThreadMutexLock(&item->mtx);
   QUEUE_PUSH(&item->qmsg, q);
   taosThreadMutexUnlock(&item->mtx);
-  int64_t el = taosGetTimestampUs() - st;
-  if (el > 50) {
-    // tInfo("lock and unlock cost:%d", (int)el);
-  }
   return uv_async_send(async);
 }
 
@@ -349,30 +317,21 @@ void transReqQueueInit(queue* q) {
   QUEUE_INIT(q);
 }
 void* transReqQueuePush(queue* q) {
-  uv_write_t* req = taosMemoryCalloc(1, sizeof(uv_write_t));
-  STransReq*  wreq = taosMemoryCalloc(1, sizeof(STransReq));
-  wreq->data = req;
-  req->data = wreq;
-  QUEUE_PUSH(q, &wreq->q);
-  return req;
+  STransReq* req = taosMemoryCalloc(1, sizeof(STransReq));
+  req->wreq.data = req;
+  QUEUE_PUSH(q, &req->q);
+  return &req->wreq;
 }
 void* transReqQueueRemove(void* arg) {
   void*       ret = NULL;
-  uv_write_t* req = arg;
-  STransReq*  wreq = req && req->data ? req->data : NULL;
+  uv_write_t* wreq = arg;
 
-  assert(wreq->data == req);
-  if (wreq == NULL || wreq->data == NULL) {
-    taosMemoryFree(wreq->data);
-    taosMemoryFree(wreq);
-    return req;
-  }
+  STransReq* req = wreq ? wreq->data : NULL;
+  if (req == NULL) return NULL;
+  QUEUE_REMOVE(&req->q);
 
-  QUEUE_REMOVE(&wreq->q);
-
-  ret = req && req->handle ? req->handle->data : NULL;
-  taosMemoryFree(wreq->data);
-  taosMemoryFree(wreq);
+  ret = wreq && wreq->handle ? wreq->handle->data : NULL;
+  taosMemoryFree(req);
 
   return ret;
 }
@@ -381,7 +340,6 @@ void transReqQueueClear(queue* q) {
     queue* h = QUEUE_HEAD(q);
     QUEUE_REMOVE(h);
     STransReq* req = QUEUE_DATA(h, STransReq, q);
-    taosMemoryFree(req->data);
     taosMemoryFree(req);
   }
 }
diff --git a/source/libs/transport/src/transSvr.c b/source/libs/transport/src/transSvr.c
index 8b27d95e52..14b8b35478 100644
--- a/source/libs/transport/src/transSvr.c
+++ b/source/libs/transport/src/transSvr.c
@@ -75,7 +75,6 @@ typedef struct SWorkThrd {
   SAsyncPool*   asyncPool;
   uv_prepare_t* prepare;
   queue         msg;
-  TdThreadMutex msgMtx;
 
   queue conn;
   void* pTransInst;
@@ -499,6 +498,7 @@ void uvWorkerAsyncCb(uv_async_t* handle) {
       tError("unexcept occurred, continue");
       continue;
     }
+
     // release handle to rpc init
     if (msg->type == Quit) {
       (*transAsyncHandle[msg->type])(msg, pThrd);
@@ -743,7 +743,6 @@ static bool addHandleToWorkloop(SWorkThrd* pThrd, char* pipeName) {
   pThrd->pipe->data = pThrd;
 
   QUEUE_INIT(&pThrd->msg);
-  taosThreadMutexInit(&pThrd->msgMtx, NULL);
 
   pThrd->prepare = taosMemoryCalloc(1, sizeof(uv_prepare_t));
   uv_prepare_init(pThrd->loop, pThrd->prepare);
diff --git a/source/libs/transport/test/svrBench.c b/source/libs/transport/test/svrBench.c
index 224f527385..6eb80c8504 100644
--- a/source/libs/transport/test/svrBench.c
+++ b/source/libs/transport/test/svrBench.c
@@ -75,15 +75,14 @@ void processShellMsg() {
 
       void *handle = pRpcMsg->info.handle;
       taosFreeQitem(pRpcMsg);
-
-      {
-        SRpcMsg nRpcMsg = {0};
-        nRpcMsg.pCont = rpcMallocCont(msgSize);
-        nRpcMsg.contLen = msgSize;
-        nRpcMsg.info.handle = handle;
-        nRpcMsg.code = TSDB_CODE_CTG_NOT_READY;
-        rpcSendResponse(&nRpcMsg);
-      }
+      //{
+      //  SRpcMsg nRpcMsg = {0};
+      //  nRpcMsg.pCont = rpcMallocCont(msgSize);
+      //  nRpcMsg.contLen = msgSize;
+      //  nRpcMsg.info.handle = handle;
+      //  nRpcMsg.code = TSDB_CODE_CTG_NOT_READY;
+      //  rpcSendResponse(&nRpcMsg);
+      //}
     }
 
     taosUpdateItemSize(qinfo.queue, numOfMsgs);
diff --git a/source/util/src/tref.c b/source/util/src/tref.c
index 9cd849b9be..c984ef3f34 100644
--- a/source/util/src/tref.c
+++ b/source/util/src/tref.c
@@ -44,11 +44,11 @@ typedef struct {
   void (*fp)(void *);
 } SRefSet;
 
-static SRefSet         tsRefSetList[TSDB_REF_OBJECTS];
+static SRefSet       tsRefSetList[TSDB_REF_OBJECTS];
 static TdThreadOnce  tsRefModuleInit = PTHREAD_ONCE_INIT;
 static TdThreadMutex tsRefMutex;
-static int32_t         tsRefSetNum = 0;
-static int32_t         tsNextId = 0;
+static int32_t       tsRefSetNum = 0;
+static int32_t       tsNextId = 0;
 
 static void    taosInitRefModule(void);
 static void    taosLockList(int64_t *lockedBy);
diff --git a/tests/script/jenkins/basic.txt b/tests/script/jenkins/basic.txt
index 23676153b5..0bb24826a3 100644
--- a/tests/script/jenkins/basic.txt
+++ b/tests/script/jenkins/basic.txt
@@ -332,8 +332,8 @@
 ./test.sh -f tsim/vnode/stable_replica3_vnode3.sim
 
 # --- sync
-#./test.sh -f tsim/sync/3Replica1VgElect.sim
-#./test.sh -f tsim/sync/3Replica5VgElect.sim
+./test.sh -f tsim/sync/3Replica1VgElect.sim
+./test.sh -f tsim/sync/3Replica5VgElect.sim
 ./test.sh -f tsim/sync/oneReplica1VgElect.sim
 ./test.sh -f tsim/sync/oneReplica5VgElect.sim