diff --git a/include/libs/qcom/query.h b/include/libs/qcom/query.h
index f56860dd4f..6e2b83dce7 100644
--- a/include/libs/qcom/query.h
+++ b/include/libs/qcom/query.h
@@ -25,9 +25,9 @@ extern "C" {
 #include "tarray.h"
 #include "thash.h"
 #include "tlog.h"
-#include "tsimplehash.h"
 #include "tmsg.h"
 #include "tmsgcb.h"
+#include "tsimplehash.h"
 
 typedef enum {
   JOB_TASK_STATUS_NULL = 0,
@@ -69,16 +69,16 @@ typedef enum {
 #define QUERY_MSG_MASK_SHOW_REWRITE() (1 << 0)
 #define QUERY_MSG_MASK_AUDIT()        (1 << 1)
 #define QUERY_MSG_MASK_VIEW()         (1 << 2)
-#define TEST_SHOW_REWRITE_MASK(m)     (((m) & QUERY_MSG_MASK_SHOW_REWRITE()) != 0)
-#define TEST_AUDIT_MASK(m)            (((m) & QUERY_MSG_MASK_AUDIT()) != 0)
-#define TEST_VIEW_MASK(m)             (((m) & QUERY_MSG_MASK_VIEW()) != 0)
+#define TEST_SHOW_REWRITE_MASK(m)     (((m)&QUERY_MSG_MASK_SHOW_REWRITE()) != 0)
+#define TEST_AUDIT_MASK(m)            (((m)&QUERY_MSG_MASK_AUDIT()) != 0)
+#define TEST_VIEW_MASK(m)             (((m)&QUERY_MSG_MASK_VIEW()) != 0)
 
 typedef struct STableComInfo {
   uint8_t  numOfTags;     // the number of tags in schema
   uint8_t  precision;     // the number of precision
   col_id_t numOfColumns;  // the number of columns
   int16_t  numOfPKs;
-  int32_t  rowSize;       // row size of the schema
+  int32_t  rowSize;  // row size of the schema
 } STableComInfo;
 
 typedef struct SIndexMeta {
@@ -119,8 +119,9 @@ typedef struct STableMeta {
   int32_t       sversion;
   int32_t       tversion;
   STableComInfo tableInfo;
-  SSchemaExt*   schemaExt; // There is no additional memory allocation, and the pointer is fixed to the next address of the schema content.
-  SSchema       schema[];
+  SSchemaExt*   schemaExt;  // There is no additional memory allocation, and the pointer is fixed to the next address of
+                            // the schema content.
+  SSchema schema[];
 } STableMeta;
 #pragma pack(pop)
 
@@ -196,9 +197,9 @@ typedef struct SBoundColInfo {
 } SBoundColInfo;
 
 typedef struct STableColsData {
-  char     tbName[TSDB_TABLE_NAME_LEN];
-  SArray*  aCol;
-  bool     getFromHash;
+  char    tbName[TSDB_TABLE_NAME_LEN];
+  SArray* aCol;
+  bool    getFromHash;
 } STableColsData;
 
 typedef struct STableVgUid {
@@ -207,15 +208,14 @@ typedef struct STableVgUid {
 } STableVgUid;
 
 typedef struct STableBufInfo {
-  void*     pCurBuff;
-  SArray*   pBufList;
-  int64_t   buffUnit;
-  int64_t   buffSize;
-  int64_t   buffIdx;
-  int64_t   buffOffset;
+  void*   pCurBuff;
+  SArray* pBufList;
+  int64_t buffUnit;
+  int64_t buffSize;
+  int64_t buffIdx;
+  int64_t buffOffset;
 } STableBufInfo;
 
-
 typedef struct STableDataCxt {
   STableMeta*    pMeta;
   STSchema*      pSchema;
@@ -237,23 +237,22 @@ typedef struct SStbInterlaceInfo {
   void*          pRequest;
   uint64_t       requestId;
   int64_t        requestSelf;
-  bool           tbFromHash;      
+  bool           tbFromHash;
   SHashObj*      pVgroupHash;
   SArray*        pVgroupList;
   SSHashObj*     pTableHash;
   int64_t        tbRemainNum;
   STableBufInfo  tbBuf;
   char           firstName[TSDB_TABLE_NAME_LEN];
-  STSchema      *pTSchema;
-  STableDataCxt *pDataCtx;
-  void          *boundTags;
+  STSchema*      pTSchema;
+  STableDataCxt* pDataCtx;
+  void*          boundTags;
 
-  bool           tableColsReady;
-  SArray        *pTableCols;
-  int32_t        pTableColsIdx;
+  bool    tableColsReady;
+  SArray* pTableCols;
+  int32_t pTableColsIdx;
 } SStbInterlaceInfo;
 
-
 typedef int32_t (*__async_send_cb_fn_t)(void* param, SDataBuf* pMsg, int32_t code);
 typedef int32_t (*__async_exec_fn_t)(void* param);
 
@@ -308,6 +307,8 @@ void destroyAhandle(void* ahandle);
 int32_t asyncSendMsgToServerExt(void* pTransporter, SEpSet* epSet, int64_t* pTransporterId, SMsgSendInfo* pInfo,
                                 bool persistHandle, void* ctx);
 
+int32_t asyncFreeConnById(void* pTransporter, int64_t pid);
+;
 /**
  * Asynchronously send message to server, after the response received, the callback will be incured.
  *
@@ -325,7 +326,7 @@ void initQueryModuleMsgHandle();
 
 const SSchema* tGetTbnameColumnSchema();
 bool           tIsValidSchema(struct SSchema* pSchema, int32_t numOfCols, int32_t numOfTags);
-int32_t getAsofJoinReverseOp(EOperatorType op);
+int32_t        getAsofJoinReverseOp(EOperatorType op);
 
 int32_t queryCreateCTableMetaFromMsg(STableMetaRsp* msg, SCTableMeta* pMeta);
 int32_t queryCreateTableMetaFromMsg(STableMetaRsp* msg, bool isSuperTable, STableMeta** pMeta);
@@ -384,7 +385,7 @@ extern int32_t (*queryProcessMsgRsp[TDMT_MAX])(void* output, char* msg, int32_t
 
 #define NEED_CLIENT_RM_TBLMETA_REQ(_type)                                                                  \
   ((_type) == TDMT_VND_CREATE_TABLE || (_type) == TDMT_MND_CREATE_STB || (_type) == TDMT_VND_DROP_TABLE || \
-   (_type) == TDMT_MND_DROP_STB || (_type) == TDMT_MND_CREATE_VIEW || (_type) == TDMT_MND_DROP_VIEW || \
+   (_type) == TDMT_MND_DROP_STB || (_type) == TDMT_MND_CREATE_VIEW || (_type) == TDMT_MND_DROP_VIEW ||     \
    (_type) == TDMT_MND_CREATE_TSMA || (_type) == TDMT_MND_DROP_TSMA || (_type) == TDMT_MND_DROP_TB_WITH_TSMA)
 
 #define NEED_SCHEDULER_REDIRECT_ERROR(_code)                                              \
diff --git a/include/libs/transport/trpc.h b/include/libs/transport/trpc.h
index 6c0d04354a..5b860cc23a 100644
--- a/include/libs/transport/trpc.h
+++ b/include/libs/transport/trpc.h
@@ -125,6 +125,7 @@ typedef struct SRpcInit {
   int32_t timeToGetConn;
   int8_t  supportBatch;  // 0: no batch, 1. batch
   int32_t batchSize;
+  int8_t notWaitAvaliableConn;  // 1: wait to get, 0: no wait  
   void   *parent;
 } SRpcInit;
 
@@ -158,18 +159,21 @@ void *rpcReallocCont(void *ptr, int64_t contLen);
 // Because taosd supports multi-process mode
 // These functions should not be used on the server side
 // Please use tmsg<xx> functions, which are defined in tmsgcb.h
-int rpcSendRequest(void *thandle, const SEpSet *pEpSet, SRpcMsg *pMsg, int64_t *rid);
-int rpcSendResponse(const SRpcMsg *pMsg);
-int rpcRegisterBrokenLinkArg(SRpcMsg *msg);
-int rpcReleaseHandle(void *handle, int8_t type);  // just release conn to rpc instance, no close sock
+int32_t rpcSendRequest(void *thandle, const SEpSet *pEpSet, SRpcMsg *pMsg, int64_t *rid);
+int32_t rpcSendResponse(const SRpcMsg *pMsg);
+int32_t rpcRegisterBrokenLinkArg(SRpcMsg *msg);
+int32_t rpcReleaseHandle(void *handle, int8_t type);  // just release conn to rpc instance, no close sock
 
 // These functions will not be called in the child process
-int     rpcSendRequestWithCtx(void *thandle, const SEpSet *pEpSet, SRpcMsg *pMsg, int64_t *rid, SRpcCtx *ctx);
-int     rpcSendRecv(void *shandle, SEpSet *pEpSet, SRpcMsg *pReq, SRpcMsg *pRsp);
-int     rpcSendRecvWithTimeout(void *shandle, SEpSet *pEpSet, SRpcMsg *pMsg, SRpcMsg *pRsp, int8_t *epUpdated,
+int32_t rpcSendRequestWithCtx(void *thandle, const SEpSet *pEpSet, SRpcMsg *pMsg, int64_t *rid, SRpcCtx *ctx);
+int32_t rpcSendRecv(void *shandle, SEpSet *pEpSet, SRpcMsg *pReq, SRpcMsg *pRsp);
+int32_t rpcSendRecvWithTimeout(void *shandle, SEpSet *pEpSet, SRpcMsg *pMsg, SRpcMsg *pRsp, int8_t *epUpdated,
                                int32_t timeoutMs);
-int     rpcSetDefaultAddr(void *thandle, const char *ip, const char *fqdn);
-void   *rpcAllocHandle();
+
+int32_t rpcFreeConnById(void *shandle, int64_t connId);
+
+int32_t rpcSetDefaultAddr(void *thandle, const char *ip, const char *fqdn);
+int32_t rpcAllocHandle(int64_t *refId);
 int32_t rpcSetIpWhite(void *thandl, void *arg);
 
 int32_t rpcUtilSIpRangeToStr(SIpV4Range *pRange, char *buf);
diff --git a/source/dnode/mgmt/node_mgmt/src/dmTransport.c b/source/dnode/mgmt/node_mgmt/src/dmTransport.c
index 3d758e1fd3..9bbfdd18b0 100644
--- a/source/dnode/mgmt/node_mgmt/src/dmTransport.c
+++ b/source/dnode/mgmt/node_mgmt/src/dmTransport.c
@@ -387,6 +387,7 @@ int32_t dmInitClient(SDnode *pDnode) {
   rpcInit.supportBatch = 1;
   rpcInit.batchSize = 8 * 1024;
   rpcInit.timeToGetConn = tsTimeToGetAvailableConn;
+  rpcInit.notWaitAvaliableConn = 1;
 
   (void)taosVersionStrToInt(version, &(rpcInit.compatibilityVer));
 
diff --git a/source/libs/executor/inc/executorInt.h b/source/libs/executor/inc/executorInt.h
index 668d40dd0b..d295e868e9 100644
--- a/source/libs/executor/inc/executorInt.h
+++ b/source/libs/executor/inc/executorInt.h
@@ -202,6 +202,7 @@ typedef struct SExchangeInfo {
   SLimitInfo          limitInfo;
   int64_t             openedTs;  // start exec time stamp, todo: move to SLoadRemoteDataInfo
   char*               pTaskId;
+  SArray*             pFetchRpcHandles;
 } SExchangeInfo;
 
 typedef struct SScanInfo {
diff --git a/source/libs/executor/src/exchangeoperator.c b/source/libs/executor/src/exchangeoperator.c
index 21b1c2838b..22bb6524f1 100644
--- a/source/libs/executor/src/exchangeoperator.c
+++ b/source/libs/executor/src/exchangeoperator.c
@@ -298,13 +298,13 @@ _end:
     pTaskInfo->code = code;
     T_LONG_JMP(pTaskInfo->env, code);
   }
-  (*ppRes) =  NULL;
+  (*ppRes) = NULL;
   return code;
 }
 
 static SSDataBlock* loadRemoteData(SOperatorInfo* pOperator) {
   SSDataBlock* pRes = NULL;
-  int32_t code = loadRemoteDataNext(pOperator, &pRes);
+  int32_t      code = loadRemoteDataNext(pOperator, &pRes);
   return pRes;
 }
 
@@ -346,6 +346,14 @@ static int32_t initExchangeOperator(SExchangePhysiNode* pExNode, SExchangeInfo*
     qError("%s invalid number: %d of sources in exchange operator", id, (int32_t)numOfSources);
     return TSDB_CODE_INVALID_PARA;
   }
+  pInfo->pFetchRpcHandles = taosArrayInit(numOfSources, sizeof(int64_t));
+  if (!pInfo->pFetchRpcHandles) {
+    return terrno;
+  }
+  void* ret = taosArrayReserve(pInfo->pFetchRpcHandles, numOfSources);
+  if (!ret) {
+    return terrno;
+  }
 
   pInfo->pSources = taosArrayInit(numOfSources, sizeof(SDownstreamSourceNode));
   if (pInfo->pSources == NULL) {
@@ -384,6 +392,7 @@ static int32_t initExchangeOperator(SExchangePhysiNode* pExNode, SExchangeInfo*
   initLimitInfo(pExNode->node.pLimit, pExNode->node.pSlimit, &pInfo->limitInfo);
   pInfo->self = taosAddRef(exchangeObjRefPool, pInfo);
 
+
   return initDataSource(numOfSources, pInfo, id);
 }
 
@@ -391,7 +400,7 @@ int32_t createExchangeOperatorInfo(void* pTransporter, SExchangePhysiNode* pExNo
                                    SOperatorInfo** pOptrInfo) {
   QRY_OPTR_CHECK(pOptrInfo);
 
-  int32_t code = 0;
+  int32_t        code = 0;
   int32_t        lino = 0;
   SExchangeInfo* pInfo = taosMemoryCalloc(1, sizeof(SExchangeInfo));
   SOperatorInfo* pOperator = taosMemoryCalloc(1, sizeof(SOperatorInfo));
@@ -468,6 +477,14 @@ void freeSourceDataInfo(void* p) {
 
 void doDestroyExchangeOperatorInfo(void* param) {
   SExchangeInfo* pExInfo = (SExchangeInfo*)param;
+  for (int32_t i = 0; i < pExInfo->pFetchRpcHandles->size; ++i) {
+    int64_t* pRpcHandle = taosArrayGet(pExInfo->pFetchRpcHandles, i);
+    if (*pRpcHandle > 0) {
+      SDownstreamSourceNode* pSource = taosArrayGet(pExInfo->pSources, i);
+      (void)asyncFreeConnById(pExInfo->pTransporter, *pRpcHandle);
+    }
+  }
+  taosArrayDestroy(pExInfo->pFetchRpcHandles);
 
   taosArrayDestroy(pExInfo->pSources);
   taosArrayDestroyEx(pExInfo->pSourceDataInfo, freeSourceDataInfo);
@@ -495,6 +512,8 @@ int32_t loadRemoteDataCallback(void* param, SDataBuf* pMsg, int32_t code) {
   }
 
   int32_t          index = pWrapper->sourceIndex;
+  int64_t* pRpcHandle = taosArrayGet(pExchangeInfo->pFetchRpcHandles, index);
+  *pRpcHandle = -1;
   SSourceDataInfo* pSourceDataInfo = taosArrayGet(pExchangeInfo->pSourceDataInfo, index);
   if (!pSourceDataInfo) {
     return terrno;
@@ -668,6 +687,8 @@ int32_t doSendFetchDataRequest(SExchangeInfo* pExchangeInfo, SExecTaskInfo* pTas
     int64_t transporterId = 0;
     code = asyncSendMsgToServer(pExchangeInfo->pTransporter, &pSource->addr.epSet, &transporterId, pMsgSendInfo);
     QUERY_CHECK_CODE(code, lino, _end);
+    int64_t* pRpcHandle = taosArrayGet(pExchangeInfo->pFetchRpcHandles, sourceIndex);
+    *pRpcHandle = transporterId;
   }
 
 _end:
@@ -690,7 +711,7 @@ int32_t extractDataBlockFromFetchRsp(SSDataBlock* pRes, char* pData, SArray* pCo
   int32_t lino = 0;
   if (pColList == NULL) {  // data from other sources
     blockDataCleanup(pRes);
-    code = blockDecode(pRes, pData, (const char**) pNextStart);
+    code = blockDecode(pRes, pData, (const char**)pNextStart);
     if (code) {
       return code;
     }
diff --git a/source/libs/qcom/src/queryUtil.c b/source/libs/qcom/src/queryUtil.c
index 9b61f81939..d47a183121 100644
--- a/source/libs/qcom/src/queryUtil.c
+++ b/source/libs/qcom/src/queryUtil.c
@@ -225,6 +225,7 @@ int32_t asyncSendMsgToServerExt(void* pTransporter, SEpSet* epSet, int64_t* pTra
     .code = 0
   };
   TRACE_SET_ROOTID(&rpcMsg.info.traceId, pInfo->requestId);
+
   int code = rpcSendRequestWithCtx(pTransporter, epSet, &rpcMsg, pTransporterId, rpcCtx);
   if (code) {
     destroySendMsgInfo(pInfo);
@@ -235,6 +236,9 @@ int32_t asyncSendMsgToServerExt(void* pTransporter, SEpSet* epSet, int64_t* pTra
 int32_t asyncSendMsgToServer(void* pTransporter, SEpSet* epSet, int64_t* pTransporterId, SMsgSendInfo* pInfo) {
   return asyncSendMsgToServerExt(pTransporter, epSet, pTransporterId, pInfo, false, NULL);
 }
+int32_t asyncFreeConnById(void* pTransporter, int64_t pid) {
+  return rpcFreeConnById(pTransporter, pid);
+}
 
 char* jobTaskStatusStr(int32_t status) {
   switch (status) {
@@ -448,13 +452,13 @@ void parseTagDatatoJson(void* p, char** jsonStr) {
       if (value == NULL) {
         goto end;
       }
-      if(!cJSON_AddItemToObject(json, tagJsonKey, value)){
+      if (!cJSON_AddItemToObject(json, tagJsonKey, value)) {
         goto end;
       }
     } else if (type == TSDB_DATA_TYPE_NCHAR) {
       cJSON* value = NULL;
       if (pTagVal->nData > 0) {
-        char*   tagJsonValue = taosMemoryCalloc(pTagVal->nData, 1);
+        char* tagJsonValue = taosMemoryCalloc(pTagVal->nData, 1);
         if (tagJsonValue == NULL) {
           goto end;
         }
@@ -479,7 +483,7 @@ void parseTagDatatoJson(void* p, char** jsonStr) {
         goto end;
       }
 
-      if(!cJSON_AddItemToObject(json, tagJsonKey, value)){
+      if (!cJSON_AddItemToObject(json, tagJsonKey, value)) {
         goto end;
       }
     } else if (type == TSDB_DATA_TYPE_DOUBLE) {
@@ -488,7 +492,7 @@ void parseTagDatatoJson(void* p, char** jsonStr) {
       if (value == NULL) {
         goto end;
       }
-      if(!cJSON_AddItemToObject(json, tagJsonKey, value)){
+      if (!cJSON_AddItemToObject(json, tagJsonKey, value)) {
         goto end;
       }
     } else if (type == TSDB_DATA_TYPE_BOOL) {
@@ -497,7 +501,7 @@ void parseTagDatatoJson(void* p, char** jsonStr) {
       if (value == NULL) {
         goto end;
       }
-      if(!cJSON_AddItemToObject(json, tagJsonKey, value)){
+      if (!cJSON_AddItemToObject(json, tagJsonKey, value)) {
         goto end;
       }
     } else {
diff --git a/source/libs/scheduler/src/schRemote.c b/source/libs/scheduler/src/schRemote.c
index 08a8f684f5..9215254f9c 100644
--- a/source/libs/scheduler/src/schRemote.c
+++ b/source/libs/scheduler/src/schRemote.c
@@ -17,11 +17,11 @@
 #include "command.h"
 #include "query.h"
 #include "schInt.h"
+#include "tglobal.h"
+#include "tmisce.h"
 #include "tmsg.h"
 #include "tref.h"
 #include "trpc.h"
-#include "tglobal.h"
-#include "tmisce.h"
 
 // clang-format off
 int32_t schValidateRspMsgType(SSchJob *pJob, SSchTask *pTask, int32_t msgType) {
@@ -975,11 +975,13 @@ int32_t schAsyncSendMsg(SSchJob *pJob, SSchTask *pTask, SSchTrans *trans, SQuery
   SCH_ERR_JRET(schUpdateSendTargetInfo(pMsgSendInfo, addr, pTask));
 
   if (isHb && persistHandle && trans->pHandle == 0) {
-    trans->pHandle = rpcAllocHandle();
-    if (NULL == trans->pHandle) {
-      SCH_TASK_ELOG("rpcAllocHandle failed, code:%x", terrno);
-      SCH_ERR_JRET(terrno);
+    int64_t refId = 0;
+    code = rpcAllocHandle(&refId); 
+    if (code != 0) {
+      SCH_TASK_ELOG("rpcAllocHandle failed, code:%x", code);
+      SCH_ERR_JRET(code);
     }
+    trans->pHandle = (void *)refId;
   } 
 
   if (pJob && pTask) {
@@ -1200,7 +1202,14 @@ int32_t schBuildAndSendMsg(SSchJob *pJob, SSchTask *pTask, SQueryNodeAddr *addr,
       }
 
       persistHandle = true;
-      SCH_SET_TASK_HANDLE(pTask, rpcAllocHandle());
+      int64_t refId = 0;
+      code = rpcAllocHandle(&refId);
+      if (code != 0) {
+        SCH_TASK_ELOG("rpcAllocHandle failed, code:%x", code);
+        SCH_ERR_JRET(code);
+      }
+
+      SCH_SET_TASK_HANDLE(pTask, (void *)refId);
       break;
     }
     case TDMT_SCH_FETCH:
diff --git a/source/libs/transport/inc/transComm.h b/source/libs/transport/inc/transComm.h
index e66941244c..820075787f 100644
--- a/source/libs/transport/inc/transComm.h
+++ b/source/libs/transport/inc/transComm.h
@@ -148,7 +148,6 @@ typedef struct {
   STransSyncMsg* pSyncMsg;  // for syncchronous with timeout API
   int64_t        syncMsgRef;
   SCvtAddr       cvtAddr;
-  bool           setMaxRetry;
 
   int32_t retryMinInterval;
   int32_t retryMaxInterval;
@@ -207,7 +206,7 @@ typedef struct {
 
 #pragma pack(pop)
 
-typedef enum { Normal, Quit, Release, Register, Update } STransMsgType;
+typedef enum { Normal, Quit, Release, Register, Update, FreeById } STransMsgType;
 typedef enum { ConnNormal, ConnAcquire, ConnRelease, ConnBroken, ConnInPool } ConnStatus;
 
 #define container_of(ptr, type, member) ((type*)((char*)(ptr)-offsetof(type, member)))
@@ -304,10 +303,10 @@ int32_t transClearBuffer(SConnBuffer* buf);
 int32_t transDestroyBuffer(SConnBuffer* buf);
 int32_t transAllocBuffer(SConnBuffer* connBuf, uv_buf_t* uvBuf);
 bool    transReadComplete(SConnBuffer* connBuf);
-int     transResetBuffer(SConnBuffer* connBuf, int8_t resetBuf);
-int     transDumpFromBuffer(SConnBuffer* connBuf, char** buf, int8_t resetBuf);
+int32_t transResetBuffer(SConnBuffer* connBuf, int8_t resetBuf);
+int32_t transDumpFromBuffer(SConnBuffer* connBuf, char** buf, int8_t resetBuf);
 
-int transSetConnOption(uv_tcp_t* stream, int keepalive);
+int32_t transSetConnOption(uv_tcp_t* stream, int keepalive);
 
 void transRefSrvHandle(void* handle);
 void transUnrefSrvHandle(void* handle);
@@ -315,21 +314,24 @@ void transUnrefSrvHandle(void* handle);
 void transRefCliHandle(void* handle);
 void transUnrefCliHandle(void* handle);
 
-int transReleaseCliHandle(void* handle);
-int transReleaseSrvHandle(void* handle);
+int32_t transReleaseCliHandle(void* handle);
+int32_t transReleaseSrvHandle(void* handle);
 
-int     transSendRequest(void* shandle, const SEpSet* pEpSet, STransMsg* pMsg, STransCtx* pCtx);
-int     transSendRecv(void* shandle, const SEpSet* pEpSet, STransMsg* pMsg, STransMsg* pRsp);
-int     transSendRecvWithTimeout(void* shandle, SEpSet* pEpSet, STransMsg* pMsg, STransMsg* pRsp, int8_t* epUpdated,
+int32_t transSendRequest(void* shandle, const SEpSet* pEpSet, STransMsg* pMsg, STransCtx* pCtx);
+int32_t transSendRecv(void* shandle, const SEpSet* pEpSet, STransMsg* pMsg, STransMsg* pRsp);
+int32_t transSendRecvWithTimeout(void* shandle, SEpSet* pEpSet, STransMsg* pMsg, STransMsg* pRsp, int8_t* epUpdated,
                                  int32_t timeoutMs);
-int     transSendResponse(const STransMsg* msg);
-int     transRegisterMsg(const STransMsg* msg);
-int     transSetDefaultAddr(void* shandle, const char* ip, const char* fqdn);
+int32_t transSendRequestWithId(void* shandle, const SEpSet* pEpSet, STransMsg* pReq, int64_t* transpointId);
+int32_t transFreeConnById(void* shandle, int64_t transpointId);
+
+int32_t transSendResponse(const STransMsg* msg);
+int32_t transRegisterMsg(const STransMsg* msg);
+int32_t transSetDefaultAddr(void* shandle, const char* ip, const char* fqdn);
 int32_t transSetIpWhiteList(void* shandle, void* arg, FilteFunc* func);
 
-int transSockInfo2Str(struct sockaddr* sockname, char* dst);
+int32_t transSockInfo2Str(struct sockaddr* sockname, char* dst);
 
-int64_t transAllocHandle();
+int32_t transAllocHandle(int64_t* refId);
 
 void* transInitServer(uint32_t ip, uint32_t port, char* label, int numOfThreads, void* fp, void* shandle);
 void* transInitClient(uint32_t ip, uint32_t port, char* label, int numOfThreads, void* fp, void* shandle);
diff --git a/source/libs/transport/inc/transportInt.h b/source/libs/transport/inc/transportInt.h
index 7853e25cff..703a4dde3e 100644
--- a/source/libs/transport/inc/transportInt.h
+++ b/source/libs/transport/inc/transportInt.h
@@ -58,6 +58,8 @@ typedef struct {
   int32_t failFastThreshold;
   int32_t failFastInterval;
 
+  int8_t notWaitAvaliableConn;  // 1: no delay, 0: delay
+
   void (*cfp)(void* parent, SRpcMsg*, SEpSet*);
   bool (*retry)(int32_t code, tmsg_t msgType);
   bool (*startTimer)(int32_t code, tmsg_t msgType);
diff --git a/source/libs/transport/src/trans.c b/source/libs/transport/src/trans.c
index fbcc74e8e1..8b99443a84 100644
--- a/source/libs/transport/src/trans.c
+++ b/source/libs/transport/src/trans.c
@@ -102,6 +102,8 @@ void* rpcOpen(const SRpcInit* pInit) {
   if (pRpc->timeToGetConn == 0) {
     pRpc->timeToGetConn = 10 * 1000;
   }
+  pRpc->notWaitAvaliableConn = pInit->notWaitAvaliableConn;
+  
   pRpc->tcphandle =
       (*taosInitHandle[pRpc->connType])(ip, pInit->localPort, pRpc->label, pRpc->numOfThreads, NULL, pRpc);
 
@@ -163,38 +165,48 @@ void* rpcReallocCont(void* ptr, int64_t contLen) {
   return st + TRANS_MSG_OVERHEAD;
 }
 
-int rpcSendRequest(void* shandle, const SEpSet* pEpSet, SRpcMsg* pMsg, int64_t* pRid) {
+int32_t rpcSendRequest(void* shandle, const SEpSet* pEpSet, SRpcMsg* pMsg, int64_t* pRid) {
   return transSendRequest(shandle, pEpSet, pMsg, NULL);
 }
-int rpcSendRequestWithCtx(void* shandle, const SEpSet* pEpSet, SRpcMsg* pMsg, int64_t* pRid, SRpcCtx* pCtx) {
-  return transSendRequest(shandle, pEpSet, pMsg, pCtx);
-}
-int rpcSendRecv(void* shandle, SEpSet* pEpSet, SRpcMsg* pMsg, SRpcMsg* pRsp) {
-  return transSendRecv(shandle, pEpSet, pMsg, pRsp);
-}
-int rpcSendRecvWithTimeout(void* shandle, SEpSet* pEpSet, SRpcMsg* pMsg, SRpcMsg* pRsp, int8_t* epUpdated,
-                           int32_t timeoutMs) {
-  return transSendRecvWithTimeout(shandle, pEpSet, pMsg, pRsp, epUpdated, timeoutMs);
+int32_t rpcSendRequestWithCtx(void* shandle, const SEpSet* pEpSet, SRpcMsg* pMsg, int64_t* pRid, SRpcCtx* pCtx) {
+  if (pCtx != NULL || pMsg->info.handle != 0 || pMsg->info.noResp != 0|| pRid == NULL) {
+    return transSendRequest(shandle, pEpSet, pMsg, pCtx);
+  } else {
+    return transSendRequestWithId(shandle, pEpSet, pMsg, pRid);
+  }
 }
 
-int rpcSendResponse(const SRpcMsg* pMsg) { return transSendResponse(pMsg); }
+int32_t rpcSendRequestWithId(void* shandle, const SEpSet* pEpSet, STransMsg* pReq, int64_t* transpointId) {
+  return transSendRequestWithId(shandle, pEpSet, pReq, transpointId);
+}
+
+int32_t rpcSendRecv(void* shandle, SEpSet* pEpSet, SRpcMsg* pMsg, SRpcMsg* pRsp) {
+  return transSendRecv(shandle, pEpSet, pMsg, pRsp);
+}
+int32_t rpcSendRecvWithTimeout(void* shandle, SEpSet* pEpSet, SRpcMsg* pMsg, SRpcMsg* pRsp, int8_t* epUpdated,
+                               int32_t timeoutMs) {
+  return transSendRecvWithTimeout(shandle, pEpSet, pMsg, pRsp, epUpdated, timeoutMs);
+}
+int32_t rpcFreeConnById(void* shandle, int64_t connId) { return transFreeConnById(shandle, connId); }
+
+int32_t rpcSendResponse(const SRpcMsg* pMsg) { return transSendResponse(pMsg); }
 
 void rpcRefHandle(void* handle, int8_t type) { (*taosRefHandle[type])(handle); }
 
 void rpcUnrefHandle(void* handle, int8_t type) { (*taosUnRefHandle[type])(handle); }
 
-int rpcRegisterBrokenLinkArg(SRpcMsg* msg) { return transRegisterMsg(msg); }
-int rpcReleaseHandle(void* handle, int8_t type) { return (*transReleaseHandle[type])(handle); }
+int32_t rpcRegisterBrokenLinkArg(SRpcMsg* msg) { return transRegisterMsg(msg); }
+int32_t rpcReleaseHandle(void* handle, int8_t type) { return (*transReleaseHandle[type])(handle); }
 
 // client only
-int rpcSetDefaultAddr(void* thandle, const char* ip, const char* fqdn) {
+int32_t rpcSetDefaultAddr(void* thandle, const char* ip, const char* fqdn) {
   // later
   return transSetDefaultAddr(thandle, ip, fqdn);
 }
 // server only
 int32_t rpcSetIpWhite(void* thandle, void* arg) { return transSetIpWhiteList(thandle, arg, NULL); }
 
-void* rpcAllocHandle() { return (void*)transAllocHandle(); }
+int32_t rpcAllocHandle(int64_t* refId) { return transAllocHandle(refId); }
 
 int32_t rpcUtilSIpRangeToStr(SIpV4Range* pRange, char* buf) { return transUtilSIpRangeToStr(pRange, buf); }
 int32_t rpcUtilSWhiteListToStr(SIpWhiteList* pWhiteList, char** ppBuf) {
diff --git a/source/libs/transport/src/transCli.c b/source/libs/transport/src/transCli.c
index 2e61f19af8..4b324e52c6 100644
--- a/source/libs/transport/src/transCli.c
+++ b/source/libs/transport/src/transCli.c
@@ -213,8 +213,10 @@ static void cliHandleReq(SCliMsg* pMsg, SCliThrd* pThrd);
 static void cliHandleQuit(SCliMsg* pMsg, SCliThrd* pThrd);
 static void cliHandleRelease(SCliMsg* pMsg, SCliThrd* pThrd);
 static void cliHandleUpdate(SCliMsg* pMsg, SCliThrd* pThrd);
-static void (*cliAsyncHandle[])(SCliMsg* pMsg, SCliThrd* pThrd) = {cliHandleReq, cliHandleQuit, cliHandleRelease, NULL,
-                                                                   cliHandleUpdate};
+static void cliHandleFreeById(SCliMsg* pMsg, SCliThrd* pThrd);
+
+static void (*cliAsyncHandle[])(SCliMsg* pMsg, SCliThrd* pThrd) = {cliHandleReq, cliHandleQuit,   cliHandleRelease,
+                                                                   NULL,         cliHandleUpdate, cliHandleFreeById};
 /// static void (*cliAsyncHandle[])(SCliMsg* pMsg, SCliThrd* pThrd) = {cliHandleReq, cliHandleQuit, cliHandleRelease,
 /// NULL,cliHandleUpdate};
 
@@ -660,7 +662,9 @@ static SCliConn* getConnFromPool(SCliThrd* pThrd, char* key, bool* exceed) {
   if (QUEUE_IS_EMPTY(&plist->conns)) {
     if (plist->list->numOfConn >= pTranInst->connLimitNum) {
       *exceed = true;
+      return NULL;;
     }
+    plist->list->numOfConn++;
     return NULL;
   }
 
@@ -704,7 +708,7 @@ static SCliConn* getConnFromPool2(SCliThrd* pThrd, char* key, SCliMsg** pMsg) {
     SMsgList* list = plist->list;
     if ((list)->numOfConn >= pTransInst->connLimitNum) {
       STraceId* trace = &(*pMsg)->msg.info.traceId;
-      if (pTransInst->noDelayFp != NULL && pTransInst->noDelayFp((*pMsg)->msg.msgType)) {
+      if (pTransInst->notWaitAvaliableConn || (pTransInst->noDelayFp != NULL && pTransInst->noDelayFp((*pMsg)->msg.msgType))) {
         tDebug("%s msg %s not to send, reason: %s", pTransInst->label, TMSG_INFO((*pMsg)->msg.msgType),
                tstrerror(TSDB_CODE_RPC_NETWORK_BUSY));
         doNotifyApp(*pMsg, pThrd, TSDB_CODE_RPC_NETWORK_BUSY);
@@ -899,10 +903,12 @@ static int32_t specifyConnRef(SCliConn* conn, bool update, int64_t handle) {
   exh->handle = conn;
   exh->pThrd = conn->hostThrd;
   taosWUnLockLatch(&exh->latch);
-
+  
   conn->refId = exh->refId;
   taosWUnLockLatch(&exh->latch);
 
+  tDebug("conn %p specified by %"PRId64"", conn, handle); 
+
   (void)transReleaseExHandle(transGetRefMgt(), handle);
   return 0;
 }
@@ -1035,7 +1041,6 @@ static void cliDestroyConn(SCliConn* conn, bool clear) {
       list->size--;
     }
   }
-
   conn->list = NULL;
 
   (void)transReleaseExHandle(transGetRefMgt(), conn->refId);
@@ -1075,8 +1080,11 @@ static void cliDestroy(uv_handle_t* handle) {
 
   (void)atomic_sub_fetch_32(&pThrd->connCount, 1);
 
+  if (conn->refId > 0) {
   (void)transReleaseExHandle(transGetRefMgt(), conn->refId);
   (void)transRemoveExHandle(transGetRefMgt(), conn->refId);
+
+  }
   taosMemoryFree(conn->dstAddr);
   taosMemoryFree(conn->stream);
 
@@ -1589,6 +1597,40 @@ static void cliHandleUpdate(SCliMsg* pMsg, SCliThrd* pThrd) {
   pThrd->cvtAddr = pCtx->cvtAddr;
   destroyCmsg(pMsg);
 }
+static void cliHandleFreeById(SCliMsg* pMsg, SCliThrd* pThrd) {
+  int32_t    code = 0;
+  int64_t    refId = (int64_t)(pMsg->msg.info.handle);
+  SExHandle* exh = transAcquireExHandle(transGetRefMgt(), refId);
+  if (exh == NULL) {
+    tDebug("id %" PRId64 " already released", refId);
+    destroyCmsg(pMsg);
+    return;
+  }
+
+  taosRLockLatch(&exh->latch);
+  SCliConn* conn = exh->handle;
+  taosRUnLockLatch(&exh->latch);
+
+  if (conn == NULL || conn->refId != refId) {
+    TAOS_CHECK_GOTO(TSDB_CODE_REF_INVALID_ID, NULL, _exception);
+  }
+  tDebug("do free conn %p by id %" PRId64 "", conn, refId);
+
+  int32_t size = transQueueSize(&conn->cliMsgs);
+  if (size == 0) {
+    // already recv, and notify upper layer
+    TAOS_CHECK_GOTO(TSDB_CODE_REF_INVALID_ID, NULL, _exception);
+    return;
+  } else {
+    while (T_REF_VAL_GET(conn) >= 1) transUnrefCliHandle(conn);
+  }
+  return;
+_exception:
+  tDebug("already free conn %p by id %" PRId64"", conn, refId);
+
+  (void)transReleaseExHandle(transGetRefMgt(), refId);
+  destroyCmsg(pMsg);
+}
 
 SCliConn* cliGetConn(SCliMsg** pMsg, SCliThrd* pThrd, bool* ignore, char* addr) {
   STransConnCtx* pCtx = (*pMsg)->ctx;
@@ -2759,7 +2801,7 @@ SCliThrd* transGetWorkThrd(STrans* trans, int64_t handle) {
   SCliThrd* pThrd = transGetWorkThrdFromHandle(trans, handle);
   return pThrd;
 }
-int transReleaseCliHandle(void* handle) {
+int32_t transReleaseCliHandle(void* handle) {
   int32_t   code = 0;
   SCliThrd* pThrd = transGetWorkThrdFromHandle(NULL, (int64_t)handle);
   if (pThrd == NULL) {
@@ -2823,25 +2865,25 @@ static int32_t transInitMsg(void* shandle, const SEpSet* pEpSet, STransMsg* pReq
   cliMsg->type = Normal;
   cliMsg->refId = (int64_t)shandle;
   QUEUE_INIT(&cliMsg->seqq);
+
   *pCliMsg = cliMsg;
 
   return 0;
 }
 
-int transSendRequest(void* shandle, const SEpSet* pEpSet, STransMsg* pReq, STransCtx* ctx) {
+int32_t transSendRequest(void* shandle, const SEpSet* pEpSet, STransMsg* pReq, STransCtx* ctx) {
   STrans* pTransInst = (STrans*)transAcquireExHandle(transGetInstMgt(), (int64_t)shandle);
   if (pTransInst == NULL) {
     transFreeMsg(pReq->pCont);
-    return TSDB_CODE_RPC_BROKEN_LINK;
+    return TSDB_CODE_RPC_MODULE_QUIT;
   }
   int32_t   code = 0;
   int64_t   handle = (int64_t)pReq->info.handle;
   SCliThrd* pThrd = transGetWorkThrd(pTransInst, handle);
   if (pThrd == NULL) {
-    transFreeMsg(pReq->pCont);
-    (void)transReleaseExHandle(transGetInstMgt(), (int64_t)shandle);
-    return TSDB_CODE_RPC_BROKEN_LINK;
+    TAOS_CHECK_GOTO(TSDB_CODE_RPC_BROKEN_LINK, NULL, _exception;);
   }
+
   if (handle != 0) {
     SExHandle* exh = transAcquireExHandle(transGetRefMgt(), handle);
     if (exh != NULL) {
@@ -2849,26 +2891,27 @@ int transSendRequest(void* shandle, const SEpSet* pEpSet, STransMsg* pReq, STran
       if (exh->handle == NULL && exh->inited != 0) {
         SCliMsg* pCliMsg = NULL;
         code = transInitMsg(shandle, pEpSet, pReq, ctx, &pCliMsg);
-        ASSERT(code == 0);
+        if (code != 0) {
+          taosWUnLockLatch(&exh->latch);
+          (void)transReleaseExHandle(transGetRefMgt(), handle);
+          TAOS_CHECK_GOTO(code, NULL, _exception);
+        }
 
         QUEUE_PUSH(&exh->q, &pCliMsg->seqq);
         taosWUnLockLatch(&exh->latch);
         tDebug("msg refId: %" PRId64 "", handle);
         (void)transReleaseExHandle(transGetInstMgt(), (int64_t)shandle);
         return 0;
+      } else {
+        exh->inited = 1;
+        taosWUnLockLatch(&exh->latch);
+        (void)transReleaseExHandle(transGetRefMgt(), handle);
       }
-      exh->inited = 1;
-      taosWUnLockLatch(&exh->latch);
-      (void)transReleaseExHandle(transGetRefMgt(), handle);
     }
   }
 
   SCliMsg* pCliMsg = NULL;
-  code = transInitMsg(shandle, pEpSet, pReq, ctx, &pCliMsg);
-  if (code != 0) {
-    (void)transReleaseExHandle(transGetInstMgt(), (int64_t)shandle);
-    return code;
-  }
+  TAOS_CHECK_GOTO(transInitMsg(shandle, pEpSet, pReq, ctx, &pCliMsg), NULL, _exception);
 
   STraceId* trace = &pReq->info.traceId;
   tGDebug("%s send request at thread:%08" PRId64 ", dst:%s:%d, app:%p", transLabel(pTransInst), pThrd->pid,
@@ -2880,13 +2923,63 @@ int transSendRequest(void* shandle, const SEpSet* pEpSet, STransMsg* pReq, STran
   }
   (void)transReleaseExHandle(transGetInstMgt(), (int64_t)shandle);
   return 0;
+
+_exception:
+  transFreeMsg(pReq->pCont);
+  (void)transReleaseExHandle(transGetInstMgt(), (int64_t)shandle);
+  return code;
+}
+int32_t transSendRequestWithId(void* shandle, const SEpSet* pEpSet, STransMsg* pReq, int64_t* transpointId) {
+  if (transpointId == NULL) {
+    ASSERT(0);
+    return TSDB_CODE_INVALID_PARA;
+  }
+  int32_t code = 0;
+
+  STrans* pTransInst = (STrans*)transAcquireExHandle(transGetInstMgt(), (int64_t)shandle);
+  if (pTransInst == NULL) {
+    TAOS_CHECK_GOTO(TSDB_CODE_RPC_MODULE_QUIT, NULL, _exception);
+  }
+
+  TAOS_CHECK_GOTO(transAllocHandle(transpointId), NULL, _exception);
+
+  SCliThrd* pThrd = transGetWorkThrd(pTransInst, *transpointId);
+  if (pThrd == NULL) {
+    TAOS_CHECK_GOTO(TSDB_CODE_RPC_BROKEN_LINK, NULL, _exception);
+  }
+
+  SExHandle* exh = transAcquireExHandle(transGetRefMgt(), *transpointId);
+  if (exh == NULL) {
+    TAOS_CHECK_GOTO(TSDB_CODE_RPC_MODULE_QUIT, NULL, _exception);
+  }
+
+  pReq->info.handle = (void*)(*transpointId);
+
+  SCliMsg* pCliMsg = NULL;
+  TAOS_CHECK_GOTO(transInitMsg(shandle, pEpSet, pReq, NULL, &pCliMsg), NULL, _exception);
+
+  STraceId* trace = &pReq->info.traceId;
+  tGDebug("%s send request at thread:%08" PRId64 ", dst:%s:%d, app:%p", transLabel(pTransInst), pThrd->pid,
+          EPSET_GET_INUSE_IP(pEpSet), EPSET_GET_INUSE_PORT(pEpSet), pReq->info.ahandle);
+  if ((code = transAsyncSend(pThrd->asyncPool, &(pCliMsg->q))) != 0) {
+    destroyCmsg(pCliMsg);
+    (void)transReleaseExHandle(transGetInstMgt(), (int64_t)shandle);
+    return (code == TSDB_CODE_RPC_ASYNC_MODULE_QUIT ? TSDB_CODE_RPC_MODULE_QUIT : code);
+  }
+  (void)transReleaseExHandle(transGetInstMgt(), (int64_t)shandle);
+  return 0;
+
+_exception:
+  transFreeMsg(pReq->pCont);
+  (void)transReleaseExHandle(transGetInstMgt(), (int64_t)shandle);
+  return code;
 }
 
-int transSendRecv(void* shandle, const SEpSet* pEpSet, STransMsg* pReq, STransMsg* pRsp) {
+int32_t transSendRecv(void* shandle, const SEpSet* pEpSet, STransMsg* pReq, STransMsg* pRsp) {
   STrans* pTransInst = (STrans*)transAcquireExHandle(transGetInstMgt(), (int64_t)shandle);
   if (pTransInst == NULL) {
     transFreeMsg(pReq->pCont);
-    return TSDB_CODE_RPC_BROKEN_LINK;
+    return TSDB_CODE_RPC_MODULE_QUIT;
   }
   int32_t code = 0;
 
@@ -2908,8 +3001,7 @@ int transSendRecv(void* shandle, const SEpSet* pEpSet, STransMsg* pReq, STransMs
   code = tsem_init(sem, 0, 0);
   if (code != 0) {
     taosMemoryFree(sem);
-    code = TAOS_SYSTEM_ERROR(errno);
-    TAOS_CHECK_GOTO(code, NULL, _RETURN1);
+    TAOS_CHECK_GOTO(TAOS_SYSTEM_ERROR(errno), NULL, _RETURN1);
   }
 
   TRACE_SET_MSGID(&pReq->info.traceId, tGenIdPI64());
@@ -3003,13 +3095,13 @@ _EXIT:
   taosMemoryFree(pSyncMsg);
   return code;
 }
-int transSendRecvWithTimeout(void* shandle, SEpSet* pEpSet, STransMsg* pReq, STransMsg* pRsp, int8_t* epUpdated,
-                             int32_t timeoutMs) {
+int32_t transSendRecvWithTimeout(void* shandle, SEpSet* pEpSet, STransMsg* pReq, STransMsg* pRsp, int8_t* epUpdated,
+                                 int32_t timeoutMs) {
   int32_t code = 0;
   STrans* pTransInst = (STrans*)transAcquireExHandle(transGetInstMgt(), (int64_t)shandle);
   if (pTransInst == NULL) {
     transFreeMsg(pReq->pCont);
-    return TSDB_CODE_RPC_BROKEN_LINK;
+    return TSDB_CODE_RPC_MODULE_QUIT;
   }
 
   STransMsg* pTransMsg = taosMemoryCalloc(1, sizeof(STransMsg));
@@ -3096,22 +3188,21 @@ _RETURN2:
 /*
  *
  **/
-int transSetDefaultAddr(void* shandle, const char* ip, const char* fqdn) {
+int32_t transSetDefaultAddr(void* shandle, const char* ip, const char* fqdn) {
+  if (ip == NULL || fqdn == NULL) return TSDB_CODE_INVALID_PARA;
+
   STrans* pTransInst = (STrans*)transAcquireExHandle(transGetInstMgt(), (int64_t)shandle);
   if (pTransInst == NULL) {
-    return TSDB_CODE_RPC_BROKEN_LINK;
+    return TSDB_CODE_RPC_MODULE_QUIT;
   }
 
   SCvtAddr cvtAddr = {0};
-  if (ip != NULL && fqdn != NULL) {
-    tstrncpy(cvtAddr.ip, ip, sizeof(cvtAddr.ip));
-    tstrncpy(cvtAddr.fqdn, fqdn, sizeof(cvtAddr.fqdn));
-    cvtAddr.cvt = true;
-  }
+  tstrncpy(cvtAddr.ip, ip, sizeof(cvtAddr.ip));
+  tstrncpy(cvtAddr.fqdn, fqdn, sizeof(cvtAddr.fqdn));
+  cvtAddr.cvt = true;
 
   int32_t code = 0;
-  int8_t  i = 0;
-  for (i = 0; i < pTransInst->numOfThreads; i++) {
+  for (int8_t i = 0; i < pTransInst->numOfThreads; i++) {
     STransConnCtx* pCtx = taosMemoryCalloc(1, sizeof(STransConnCtx));
     if (pCtx == NULL) {
       code = TSDB_CODE_OUT_OF_MEMORY;
@@ -3136,7 +3227,9 @@ int transSetDefaultAddr(void* shandle, const char* ip, const char* fqdn) {
 
     if ((code = transAsyncSend(thrd->asyncPool, &(cliMsg->q))) != 0) {
       destroyCmsg(cliMsg);
-      code = (code == TSDB_CODE_RPC_ASYNC_MODULE_QUIT ? TSDB_CODE_RPC_MODULE_QUIT : code);
+      if (code == TSDB_CODE_RPC_ASYNC_MODULE_QUIT) {
+        code = TSDB_CODE_RPC_MODULE_QUIT;
+      }
       break;
     }
   }
@@ -3145,7 +3238,7 @@ int transSetDefaultAddr(void* shandle, const char* ip, const char* fqdn) {
   return code;
 }
 
-int64_t transAllocHandle() {
+int32_t transAllocHandle(int64_t* refId) {
   SExHandle* exh = taosMemoryCalloc(1, sizeof(SExHandle));
   if (exh == NULL) {
     return TSDB_CODE_OUT_OF_MEMORY;
@@ -3166,5 +3259,43 @@ int64_t transAllocHandle() {
   QUEUE_INIT(&exh->q);
   taosInitRWLatch(&exh->latch);
   tDebug("pre alloc refId %" PRId64 "", exh->refId);
-  return exh->refId;
+  *refId = exh->refId;
+  return 0;
+}
+int32_t transFreeConnById(void* shandle, int64_t transpointId) {
+  int32_t code = 0;
+  STrans* pTransInst = (STrans*)transAcquireExHandle(transGetInstMgt(), (int64_t)shandle);
+  if (pTransInst == NULL) {
+    return TSDB_CODE_RPC_MODULE_QUIT;
+  }
+  if (transpointId == 0) {
+    tDebug("not free by refId:%"PRId64"", transpointId);
+    TAOS_CHECK_GOTO(0, NULL, _exception);
+  }
+
+  SCliThrd* pThrd = transGetWorkThrdFromHandle(pTransInst, transpointId);
+  if (pThrd == NULL) {
+    TAOS_CHECK_GOTO(TSDB_CODE_REF_INVALID_ID, NULL, _exception);
+  }
+
+  SCliMsg* pCli = taosMemoryCalloc(1, sizeof(SCliMsg));
+  if (pCli == NULL) {
+    TAOS_CHECK_GOTO(TSDB_CODE_OUT_OF_MEMORY, NULL, _exception);
+  }
+  pCli->type = FreeById;
+
+  tDebug("release conn id %" PRId64 "", transpointId);
+
+  STransMsg msg = {.info.handle = (void*)transpointId};
+  pCli->msg = msg;
+
+  code = transAsyncSend(pThrd->asyncPool, &pCli->q);
+  if (code != 0) {
+    taosMemoryFree(pCli);
+    TAOS_CHECK_GOTO(code, NULL, _exception);
+  }
+
+_exception:
+  transReleaseExHandle(transGetInstMgt(), (int64_t)shandle);
+  return code;
 }
diff --git a/source/libs/transport/src/transComm.c b/source/libs/transport/src/transComm.c
index 9df0ddb6f3..148f4d4e9a 100644
--- a/source/libs/transport/src/transComm.c
+++ b/source/libs/transport/src/transComm.c
@@ -234,7 +234,7 @@ bool transReadComplete(SConnBuffer* connBuf) {
   return (p->left == 0 || p->invalid) ? true : false;
 }
 
-int transSetConnOption(uv_tcp_t* stream, int keepalive) {
+int32_t transSetConnOption(uv_tcp_t* stream, int keepalive) {
 #if defined(WINDOWS) || defined(DARWIN)
 #else
   return uv_tcp_keepalive(stream, 1, keepalive);
@@ -745,8 +745,7 @@ int32_t transRemoveExHandle(int32_t refMgt, int64_t refId) {
   return taosRemoveRef(refMgt, refId);
 }
 
-void* transAcquireExHandle(int32_t refMgt, int64_t refId) {
-  // acquire extern handle
+void* transAcquireExHandle(int32_t refMgt, int64_t refId) {  // acquire extern handle
   return (void*)taosAcquireRef(refMgt, refId);
 }
 
diff --git a/source/libs/transport/src/transSvr.c b/source/libs/transport/src/transSvr.c
index 1e0d54eb5b..0202fbc599 100644
--- a/source/libs/transport/src/transSvr.c
+++ b/source/libs/transport/src/transSvr.c
@@ -1707,7 +1707,7 @@ void transUnrefSrvHandle(void* handle) {
   }
 }
 
-int transReleaseSrvHandle(void* handle) {
+int32_t transReleaseSrvHandle(void* handle) {
   int32_t         code = 0;
   SRpcHandleInfo* info = handle;
   SExHandle*      exh = info->handle;
@@ -1747,7 +1747,7 @@ _return2:
   return code;
 }
 
-int transSendResponse(const STransMsg* msg) {
+int32_t transSendResponse(const STransMsg* msg) {
   int32_t code = 0;
 
   if (msg->info.noResp) {
@@ -1800,7 +1800,7 @@ _return2:
   rpcFreeCont(msg->pCont);
   return code;
 }
-int transRegisterMsg(const STransMsg* msg) {
+int32_t transRegisterMsg(const STransMsg* msg) {
   int32_t code = 0;
 
   SExHandle* exh = msg->info.handle;
@@ -1891,4 +1891,4 @@ int32_t transSetIpWhiteList(void* thandle, void* arg, FilteFunc* func) {
   return code;
 }
 
-int transGetConnInfo(void* thandle, STransHandleInfo* pConnInfo) { return -1; }
+int32_t transGetConnInfo(void* thandle, STransHandleInfo* pConnInfo) { return -1; }