diff --git a/source/libs/transport/src/transCli.c b/source/libs/transport/src/transCli.c
index 9f35965431..2bf5fa11ac 100644
--- a/source/libs/transport/src/transCli.c
+++ b/source/libs/transport/src/transCli.c
@@ -90,6 +90,8 @@ typedef struct SCliConn {
   int64_t refId;
   int32_t seq;
   int32_t shareCnt;
+
+  int8_t registered;
 } SCliConn;
 
 typedef struct SCliReq {
@@ -196,11 +198,11 @@ static int32_t allocConnRef(SCliConn* conn, bool update);
 static int cliNotifyCb(SCliConn* pConn, SCliReq* pReq, STransMsg* pResp);
 void       cliResetConnTimer(SCliConn* conn);
 
-static void cliDestroyConn(SCliConn* pConn, bool clear /*clear tcp handle or not*/);
-static void cliDestroy(uv_handle_t* handle);
-static void cliSend(SCliConn* pConn);
-static void cliSendBatch(SCliConn* pConn);
-static void cliDestroyConnMsgs(SCliConn* conn, bool destroy);
+static void    cliDestroyConn(SCliConn* pConn, bool clear /*clear tcp handle or not*/);
+static void    cliDestroy(uv_handle_t* handle);
+static int32_t cliSend(SCliConn* pConn);
+static void    cliSendBatch(SCliConn* pConn);
+static void    cliDestroyConnMsgs(SCliConn* conn, bool destroy);
 
 static void    doFreeTimeoutMsg(void* param);
 static int32_t cliPreCheckSessionLimitForMsg(SCliThrd* pThrd, char* addr, SCliReq** pReq);
@@ -324,6 +326,17 @@ int32_t transHeapDelete(SHeap* heap, SCliConn* p);
     }                                            \
   } while (0)
 
+static int32_t cliConnFindToSendMsg(SCliConn* pConn, SCliReq** pReq) {
+  int32_t code = 0;
+  for (int32_t i = 0; i < transQueueSize(&pConn->reqs); i++) {
+    SCliReq* p = transQueueGet(&pConn->reqs, i);
+    if (p->sent == 0) {
+      *pReq = p;
+      return 0;
+    }
+  }
+  return TSDB_CODE_OUT_OF_RANGE;
+}
 #define CONN_SET_PERSIST_BY_APP(conn) \
   do {                                \
     if (conn->status == ConnNormal) { \
@@ -377,7 +390,7 @@ bool cliMaySendCachedMsg(SCliConn* conn) {
   if (!transQueueEmpty(&conn->reqs)) {
     SCliReq* pCliMsg = NULL;
     CONN_GET_NEXT_SENDMSG(conn);
-    cliSend(conn);
+    (void)cliSend(conn);
     return true;
   }
   return false;
@@ -404,7 +417,7 @@ bool cliConnSendSeqMsg(int64_t refId, SCliConn* conn) {
     (void)transQueuePush(&conn->reqs, t);
     tDebug("pop from conn %p, refId: %" PRId64 "", conn, refId);
     (void)transReleaseExHandle(transGetRefMgt(), refId);
-    cliSend(conn);
+    (void)cliSend(conn);
     return true;
   }
   taosWUnLockLatch(&exh->latch);
@@ -1037,7 +1050,7 @@ static void addConnToPool(void* pool, SCliConn* conn) {
     (void)transQueuePush(&conn->reqs, pReq);
 
     conn->status = ConnNormal;
-    cliSend(conn);
+    (void)cliSend(conn);
     return;
   }
 
@@ -1195,6 +1208,7 @@ static int32_t cliCreateConn2(SCliThrd* pThrd, SCliReq* pReq, SCliConn** ppConn)
   if (code != TSDB_CODE_RPC_ASYNC_IN_PROCESS) {
     cliRmReqFromConn(pConn, NULL);
     cliDestroyConn2(pConn);
+    delConnFromHeapCache(pThrd->connHeapCache, pConn);
     return code;
   } else {
   }
@@ -1202,7 +1216,15 @@ static int32_t cliCreateConn2(SCliThrd* pThrd, SCliReq* pReq, SCliConn** ppConn)
 }
 
 // not any ref,
-static int32_t cliDestroyConn2(SCliConn* conn) { return 0; }
+static int32_t cliDestroyConn2(SCliConn* conn) {
+  if (conn->registered == 0) {
+    taosMemoryFree(conn->dstAddr);
+    taosMemoryFree(conn);
+  } else {
+    cliDestroyConn(conn, true);
+  }
+  return 0;
+}
 static int32_t cliCreateConn(SCliThrd* pThrd, const SCliReq* pReq, SCliConn** pCliConn) {
   char addr[TSDB_FQDN_LEN + 64] = {0};
   CONN_CONSTRUCT_HASH_KEY(addr, EPSET_GET_INUSE_IP(&pReq->ctx->epSet), EPSET_GET_INUSE_PORT(&pReq->ctx->epSet));
@@ -1559,37 +1581,33 @@ _exception:
   return;
 }
 
-
-int32_t cliSend2(SCliConn* pConn) {
-  
-}
+// int32_t cliSend2(SCliConn* pConn) {}
 int32_t cliSendReq(SCliConn* pConn, SCliReq* pCliMsg) {
   int32_t code = 0;
   transQueuePush(&pConn->reqs, pCliMsg);
-  cliSend(pConn);
-
-  return 0;
+  code = cliSend(pConn);
+  return code;
 }
 
-void cliSend(SCliConn* pConn) {
+int32_t cliSend(SCliConn* pConn) {
   SCliThrd* pThrd = pConn->hostThrd;
   STrans*   pInst = pThrd->pInst;
+  SCliReq*  pCliReq = NULL;
+  int32_t   code = cliConnFindToSendMsg(pConn, &pCliReq);
 
-  if (transQueueEmpty(&pConn->reqs)) {
-    tError("%s conn %p not msg to send", pInst->label, pConn);
-    cliHandleExcept(pConn, -1);
-    return;
+  if (code != 0) {
+    return code;
   }
 
-  SCliReq* pCliMsg = NULL;
-  CONN_GET_NEXT_SENDMSG(pConn);
-  pCliMsg->sent = 1;
+  SReqCtx* pCtx = pCliReq->ctx;
 
-  SReqCtx* pCtx = pCliMsg->ctx;
-
-  STransMsg* pReq = (STransMsg*)(&pCliMsg->msg);
+  STransMsg* pReq = (STransMsg*)(&pCliReq->msg);
   if (pReq->pCont == 0) {
     pReq->pCont = (void*)rpcMallocCont(0);
+    if (pReq->pCont == NULL) {
+      return TSDB_CODE_OUT_OF_MEMORY;
+    }
+
     tDebug("malloc memory: %p", pReq->pCont);
     pReq->contLen = 0;
   }
@@ -1603,7 +1621,7 @@ void cliSend(SCliConn* pConn) {
     pHead->persist = REQUEST_PERSIS_HANDLE(pReq) ? 1 : 0;
     pHead->msgType = pReq->msgType;
     pHead->msgLen = (int32_t)htonl((uint32_t)msgLen);
-    pHead->release = REQUEST_RELEASE_HANDLE(pCliMsg) ? 1 : 0;
+    pHead->release = REQUEST_RELEASE_HANDLE(pCliReq) ? 1 : 0;
     memcpy(pHead->user, pInst->user, strlen(pInst->user));
     pHead->traceId = pReq->info.traceId;
     pHead->magicNum = htonl(TRANS_MAGIC_NUM);
@@ -1636,18 +1654,19 @@ void cliSend(SCliConn* pConn) {
     tGError("%s conn %p failed to send msg:%s, errmsg:%s", CONN_GET_INST_LABEL(pConn), pConn, TMSG_INFO(pReq->msgType),
             tstrerror(TSDB_CODE_OUT_OF_MEMORY));
     cliHandleExcept(pConn, -1);
-    return;
+    return TSDB_CODE_OUT_OF_MEMORY;
   }
 
+  pCliReq->sent = 1;
   int status = uv_write(req, (uv_stream_t*)pConn->stream, &wb, 1, cliSendCb);
   if (status != 0) {
     tGError("%s conn %p failed to send msg:%s, errmsg:%s", CONN_GET_INST_LABEL(pConn), pConn, TMSG_INFO(pReq->msgType),
             uv_err_name(status));
     cliHandleExcept(pConn, -1);
+    return TSDB_CODE_THIRDPARTY_ERROR;
   }
-  return;
-_RETURN:
-  return;
+
+  return TSDB_CODE_RPC_ASYNC_IN_PROCESS;
 }
 
 static void cliDestroyBatch(SCliBatch* pBatch) {
@@ -1720,7 +1739,7 @@ static int32_t cliDoConn(SCliThrd* pThrd, SCliConn* conn, char* ip, int port) {
     tError("%s conn %p failed to start timer, reason:%s", transLabel(pInst), conn, uv_err_name(ret));
     TAOS_CHECK_GOTO(TSDB_CODE_THIRDPARTY_ERROR, &lino, _exception2);
   }
-
+  conn->registered = 1;
   return TSDB_CODE_RPC_ASYNC_IN_PROCESS;
 
 _exception1:
@@ -1889,7 +1908,7 @@ void cliConnCb(uv_connect_t* req, int status) {
     return cliSendBatch_shareConn(pConn);
   }
 
-  return cliSend(pConn);
+  (void)cliSend(pConn);
 }
 
 static void doNotifyCb(SCliReq* pReq, SCliThrd* pThrd, int32_t code) {
@@ -1950,7 +1969,7 @@ static void cliHandleRelease(SCliThrd* pThrd, SCliReq* pReq) {
     if (!transQueuePush(&conn->reqs, pReq)) {
       return;
     }
-    cliSend(conn);
+    (void)cliSend(conn);
   } else {
     tError("%s conn %p already released", CONN_GET_INST_LABEL(conn), conn);
     destroyReq(pReq);
@@ -2211,7 +2230,7 @@ void cliHandleReq__noShareConn(SCliThrd* pThrd, SCliReq* pReq) {
   if (code == TSDB_CODE_RPC_MAX_SESSIONS) {
     TAOS_CHECK_GOTO(code, &lino, _exception);
   } else if (code == TSDB_CODE_RPC_ASYNC_IN_PROCESS) {
-    // do nothing, notifyCb
+    // do nothing, notiy
     return;
   } else {
     code = cliSendReq(pConn, pReq);
@@ -3526,6 +3545,7 @@ _RETURN1:
   pReq->pCont = NULL;
   return code;
 }
+
 int32_t transCreateSyncMsg(STransMsg* pTransMsg, int64_t* refId) {
   int32_t  code = 0;
   tsem2_t* sem = taosMemoryCalloc(1, sizeof(tsem2_t));
@@ -3562,6 +3582,7 @@ _EXIT:
   taosMemoryFree(pSyncMsg);
   return code;
 }
+
 int32_t transSendRecvWithTimeout(void* pInstRef, SEpSet* pEpSet, STransMsg* pReq, STransMsg* pRsp, int8_t* epUpdated,
                                  int32_t timeoutMs) {
   int32_t code = 0;