diff --git a/source/libs/transport/src/transCli.c b/source/libs/transport/src/transCli.c
index b021149c7acce0022fccb5f2ee5c3d0940b17920..1e964591665cb57c737fe8819c36f4127d2a3afe 100644
--- a/source/libs/transport/src/transCli.c
+++ b/source/libs/transport/src/transCli.c
@@ -17,6 +17,7 @@
 
 #include "transComm.h"
 
+#define CONN_HOST_THREAD_INDEX(conn ? ((SCliConn*)conn)->hThrdIdx : -1)
 #define CONN_PERSIST_TIME(para) (para * 1000 * 10)
 
 typedef struct SCliConn {
@@ -28,7 +29,8 @@ typedef struct SCliConn {
   void*        data;
   queue        conn;
   uint64_t     expireTime;
-  int8_t       notifyCount;  // timers already notify to client
+  int8_t       ctnRdCnt;  // timers already notify to client
+  int          hostThreadIndex;
 
   SRpcPush* push;
   int       persist;  //
@@ -131,11 +133,16 @@ static void clientHandleResp(SCliConn* conn) {
   rpcMsg.msgType = pHead->msgType;
   rpcMsg.ahandle = pCtx->ahandle;
 
+  if (rpcMsg.msgType == TDMT_VND_QUERY_RSP || rpcMsg.msgType == TDMT_VND_FETCH_RSP) {
+    rpcMsg.handle = conn;
+    conn->persist = 1;
+  }
+
   tDebug("client conn %p %s received from %s:%d, local info: %s:%d", conn, TMSG_INFO(pHead->msgType),
          inet_ntoa(conn->addr.sin_addr), ntohs(conn->addr.sin_port), inet_ntoa(conn->locaddr.sin_addr),
          ntohs(conn->locaddr.sin_port));
 
-  if (conn->push != NULL && conn->notifyCount != 0) {
+  if (conn->push != NULL && conn->ctnRdCnt != 0) {
     (*conn->push->callback)(conn->push->arg, &rpcMsg);
     conn->push = NULL;
   } else {
@@ -148,7 +155,7 @@ static void clientHandleResp(SCliConn* conn) {
       tsem_post(pCtx->pSem);
     }
   }
-  conn->notifyCount += 1;
+  conn->ctnRdCnt += 1;
   conn->secured = pHead->secured;
 
   // buf's mem alread translated to rpcMsg.pCont
@@ -157,13 +164,15 @@ static void clientHandleResp(SCliConn* conn) {
   uv_read_start((uv_stream_t*)conn->stream, clientAllocBufferCb, clientReadCb);
 
   SCliThrdObj* pThrd = conn->hostThrd;
+
   // user owns conn->persist = 1
-  if (conn->push == NULL) {
+  if (conn->push == NULL || conn->persist == 0) {
     addConnToPool(pThrd->pool, pCtx->ip, pCtx->port, conn);
 
     destroyCmsg(conn->data);
     conn->data = NULL;
   }
+
   // start thread's timer of conn pool if not active
   if (!uv_is_active((uv_handle_t*)pThrd->timer) && pRpc->idleTime > 0) {
     uv_timer_start((uv_timer_t*)pThrd->timer, clientTimeoutCb, CONN_PERSIST_TIME(pRpc->idleTime) / 2, 0);
@@ -189,7 +198,7 @@ static void clientHandleExcept(SCliConn* pConn) {
   rpcMsg.code = TSDB_CODE_RPC_NETWORK_UNAVAIL;
   rpcMsg.msgType = msgType + 1;
 
-  if (pConn->push != NULL && pConn->notifyCount != 0) {
+  if (pConn->push != NULL && pConn->ctnRdCnt != 0) {
     (*pConn->push->callback)(pConn->push->arg, &rpcMsg);
     pConn->push = NULL;
   } else {
@@ -210,7 +219,7 @@ static void clientHandleExcept(SCliConn* pConn) {
   }
   // transDestroyConnCtx(pCtx);
   clientConnDestroy(pConn, true);
-  pConn->notifyCount += 1;
+  pConn->ctnRdCnt += 1;
 }
 
 static void clientTimeoutCb(uv_timer_t* handle) {
@@ -292,7 +301,7 @@ static void addConnToPool(void* pool, char* ip, uint32_t port, SCliConn* conn) {
 
   conn->expireTime = taosGetTimestampMs() + CONN_PERSIST_TIME(pRpc->idleTime);
   SConnList* plist = taosHashGet((SHashObj*)pool, key, strlen(key));
-  conn->notifyCount = 0;
+  conn->ctnRdCnt = 0;
   // list already create before
   assert(plist != NULL);
   QUEUE_PUSH(&plist->conn, &conn->conn);
@@ -423,6 +432,8 @@ static void clientWrite(SCliConn* pConn) {
   pHead->msgType = pMsg->msgType;
   pHead->msgLen = (int32_t)htonl((uint32_t)msgLen);
 
+  // if (pHead->msgType == TDMT_VND_QUERY || pHead->msgType == TDMT_VND_)
+
   uv_buf_t wb = uv_buf_init((char*)pHead, msgLen);
   tDebug("client conn %p %s is send to %s:%d, local info %s:%d", pConn, TMSG_INFO(pHead->msgType),
          inet_ntoa(pConn->addr.sin_addr), ntohs(pConn->addr.sin_port), inet_ntoa(pConn->locaddr.sin_addr),
@@ -462,14 +473,25 @@ static void clientHandleQuit(SCliMsg* pMsg, SCliThrdObj* pThrd) {
 static void clientHandleReq(SCliMsg* pMsg, SCliThrdObj* pThrd) {
   uint64_t et = taosGetTimestampUs();
   uint64_t el = et - pMsg->st;
-  tTrace("client msg tran time cost: %" PRIu64 "", el);
+  tTrace("client msg tran time cost: %" PRIu64 "us", el);
   et = taosGetTimestampUs();
 
   STransConnCtx* pCtx = pMsg->ctx;
-  SCliConn*      conn = getConnFromPool(pThrd->pool, pCtx->ip, pCtx->port);
+
+  SCliConn* conn = NULL;
+  if (pMsg->msg.handle == NULL) {
+    conn = getConnFromPool(pThrd->pool, pCtx->ip, pCtx->port);
+    if (conn != NULL) {
+      tTrace("client conn %d get from conn pool", conn);
+    }
+  } else {
+    conn = (SCliConn*)(pMsg->msg.handle);
+    if (conn != NULL) {
+      tTrace("client conn %d reused", conn);
+    }
+  }
+
   if (conn != NULL) {
-    // impl later
-    tTrace("client get conn %p from pool", conn);
     conn->data = pMsg;
     conn->writeReq->data = conn;
     transDestroyBuffer(&conn->readBuf);
@@ -480,8 +502,6 @@ static void clientHandleReq(SCliMsg* pMsg, SCliThrdObj* pThrd) {
     }
     clientWrite(conn);
 
-    conn->push = pMsg->msg.push;
-
   } else {
     SCliConn* conn = calloc(1, sizeof(SCliConn));
     conn->ref++;
@@ -500,13 +520,18 @@ static void clientHandleReq(SCliMsg* pMsg, SCliThrdObj* pThrd) {
     conn->data = pMsg;
     conn->hostThrd = pThrd;
 
-    conn->push = pMsg->msg.push;
+    // conn->push = pMsg->msg.push;
+    // conn->ctnRdCnt = 0;
 
     struct sockaddr_in addr;
     uv_ip4_addr(pMsg->ctx->ip, pMsg->ctx->port, &addr);
     // handle error in callback if fail to connect
     uv_tcp_connect(&conn->connReq, (uv_tcp_t*)(conn->stream), (const struct sockaddr*)&addr, clientConnCb);
   }
+
+  conn->push = pMsg->msg.push;
+  conn->ctnRdCnt = 0;
+  conn->hThrdIdx = pCtx->hThrdIdx;
 }
 static void clientAsyncCb(uv_async_t* handle) {
   SAsyncItem*  item = handle->data;
@@ -644,6 +669,13 @@ void taosCloseClient(void* arg) {
   free(cli->pThreadObj);
   free(cli);
 }
+static int clientRBChoseIdx(SRpcInfo* pRpc) {
+  int64_t index = pRpc->index;
+  if (pRpc->index++ >= pRpc->numOfThreads) {
+    pRpc->index = 0;
+  }
+  return index % pRpc->numOfThreads;
+}
 void rpcSendRequest(void* shandle, const SEpSet* pEpSet, SRpcMsg* pMsg, int64_t* pRid) {
   // impl later
   char*    ip = (char*)(pEpSet->eps[pEpSet->inUse].fqdn);
@@ -651,48 +683,45 @@ void rpcSendRequest(void* shandle, const SEpSet* pEpSet, SRpcMsg* pMsg, int64_t*
 
   SRpcInfo* pRpc = (SRpcInfo*)shandle;
 
+  int index = CONN_HOST_THREAD_INDEX(pMsg.handle);
+  if (index == -1) {
+    index = clientRBChoseIdx(pRpc);
+  }
   int32_t flen = 0;
   if (transCompressMsg(pMsg->pCont, pMsg->contLen, &flen)) {
     // imp later
   }
-
   STransConnCtx* pCtx = calloc(1, sizeof(STransConnCtx));
-
   pCtx->pTransInst = (SRpcInfo*)shandle;
   pCtx->ahandle = pMsg->ahandle;
   pCtx->msgType = pMsg->msgType;
   pCtx->ip = strdup(ip);
   pCtx->port = port;
+  pCtx->hThrdIdx = index;
 
   assert(pRpc->connType == TAOS_CONN_CLIENT);
   // atomic or not
-  int64_t index = pRpc->index;
-  if (pRpc->index++ >= pRpc->numOfThreads) {
-    pRpc->index = 0;
-  }
+
   SCliMsg* cliMsg = malloc(sizeof(SCliMsg));
   cliMsg->ctx = pCtx;
   cliMsg->msg = *pMsg;
   cliMsg->st = taosGetTimestampUs();
 
-  SCliThrdObj* thrd = ((SClientObj*)pRpc->tcphandle)->pThreadObj[index % pRpc->numOfThreads];
-
-  // pthread_mutex_lock(&thrd->msgMtx);
-  // QUEUE_PUSH(&thrd->msg, &cliMsg->q);
-  // pthread_mutex_unlock(&thrd->msgMtx);
-
-  // int start = taosGetTimestampUs();
+  SCliThrdObj* thrd = ((SClientObj*)pRpc->tcphandle)->pThreadObj[index];
   transSendAsync(thrd->asyncPool, &(cliMsg->q));
-  // uv_async_send(thrd->cliAsync);
-  // int end = taosGetTimestampUs() - start;
-  // tError("client sent to rpc, time cost: %d", (int)end);
 }
+
 void rpcSendRecv(void* shandle, SEpSet* pEpSet, SRpcMsg* pReq, SRpcMsg* pRsp) {
   char*    ip = (char*)(pEpSet->eps[pEpSet->inUse].fqdn);
   uint32_t port = pEpSet->eps[pEpSet->inUse].port;
 
   SRpcInfo* pRpc = (SRpcInfo*)shandle;
 
+  int index = CONN_HOST_THREAD_INDEX(pMsg.handle);
+  if (index == -1) {
+    index = clientRBChoseIdx(pRpc);
+  }
+
   STransConnCtx* pCtx = calloc(1, sizeof(STransConnCtx));
   pCtx->pTransInst = (SRpcInfo*)shandle;
   pCtx->ahandle = pReq->ahandle;
@@ -703,23 +732,13 @@ void rpcSendRecv(void* shandle, SEpSet* pEpSet, SRpcMsg* pReq, SRpcMsg* pRsp) {
   pCtx->pRsp = pRsp;
   tsem_init(pCtx->pSem, 0, 0);
 
-  int64_t index = pRpc->index;
-  if (pRpc->index++ >= pRpc->numOfThreads) {
-    pRpc->index = 0;
-  }
   SCliMsg* cliMsg = malloc(sizeof(SCliMsg));
   cliMsg->ctx = pCtx;
   cliMsg->msg = *pReq;
   cliMsg->st = taosGetTimestampUs();
 
-  SCliThrdObj* thrd = ((SClientObj*)pRpc->tcphandle)->pThreadObj[index % pRpc->numOfThreads];
-
-  // pthread_mutex_lock(&thrd->msgMtx);
-  // QUEUE_PUSH(&thrd->msg, &cliMsg->q);
-  // pthread_mutex_unlock(&thrd->msgMtx);
-  // int start = taosGetTimestampUs();
+  SCliThrdObj* thrd = ((SClientObj*)pRpc->tcphandle)->pThreadObj[index];
   transSendAsync(thrd->asyncPool, &(cliMsg->q));
-
   tsem_t* pSem = pCtx->pSem;
   tsem_wait(pSem);
   tsem_destroy(pSem);