diff --git a/src/inc/trpc.h b/src/inc/trpc.h
index 48932154478df3f5ffb2db4398785a8a1a51108d..afd5d3e7ef21c25f3717f983d1f0ec5165fa310d 100644
--- a/src/inc/trpc.h
+++ b/src/inc/trpc.h
@@ -65,7 +65,7 @@ typedef struct {
   void (*cfp)(char type, void *pCont, int contLen, void *ahandle, int32_t code);  
 
   // call back to process notify the ipSet changes
-  void (*ufp)(void *ahandle, SRpcIpSet ipSet);
+  void (*ufp)(void *ahandle, SRpcIpSet *pIpSet);
 
   // call back to retrieve the client auth info 
   int  (*afp)(char *meterId, char *spi, char *encrypt, char *secret, char *ckey); 
@@ -75,9 +75,9 @@ void *rpcOpen(SRpcInit *pRpc);
 void  rpcClose(void *);
 void *rpcMallocCont(int contLen);
 void  rpcFreeCont(void *pCont);
-void  rpcSendRequest(void *thandle, SRpcIpSet ipSet, char msgType, void *pCont, int contLen, void *ahandle);
+void  rpcSendRequest(void *thandle, SRpcIpSet *pIpSet, char msgType, void *pCont, int contLen, void *ahandle);
 void  rpcSendResponse(void *pConn, int32_t code, void *pCont, int contLen);
-void  rpcSendRedirectRsp(void *pConn, SRpcIpSet ipSet); 
+void  rpcSendRedirectRsp(void *pConn, SRpcIpSet *pIpSet); 
 
 
 #ifdef __cplusplus
diff --git a/src/rpc/src/rpcCache.c b/src/rpc/src/rpcCache.c
index 2f8979a15d0ce4cc217845bd154c3b531353788f..6f5a8e9d539a0822a1adf5546a77f3dcd469e9f6 100644
--- a/src/rpc/src/rpcCache.c
+++ b/src/rpc/src/rpcCache.c
@@ -73,7 +73,7 @@ void rpcRemoveExpiredNodes(SConnCache *pCache, SConnHash *pNode, int hash, uint6
     pNext = pNode->next;
     pCache->total--;
     pCache->count[hash]--;
-    tTrace("%p ip:0x%x:%hu:%d:%p removed, connections in cache:%d", pNode->data, pNode->ip, pNode->port, hash, pNode,
+    tTrace("%p ip:0x%x:%hu:%d:%p removed from cache, connections:%d", pNode->data, pNode->ip, pNode->port, hash, pNode,
              pCache->count[hash]);
     taosMemPoolFree(pCache->connHashMemPool, (char *)pNode);
     pNode = pNext;
@@ -116,7 +116,7 @@ void rpcAddConnIntoCache(void *handle, void *data, uint32_t ip, uint16_t port, c
 
   pthread_mutex_unlock(&pCache->mutex);
 
-  tTrace("%p ip:0x%x:%hu:%d:%p added, connections in cache:%d", data, ip, port, hash, pNode, pCache->count[hash]);
+  tTrace("%p ip:0x%x:%hu:%d:%p added into cache, connections:%d", data, ip, port, hash, pNode, pCache->count[hash]);
 
   return;
 }
@@ -192,7 +192,7 @@ void *rpcGetConnFromCache(void *handle, uint32_t ip, uint16_t port, char *user)
   pthread_mutex_unlock(&pCache->mutex);
 
   if (pData) {
-    tTrace("%p ip:0x%x:%hu:%d:%p retrieved, connections in cache:%d", pData, ip, port, hash, pNode, pCache->count[hash]);
+    tTrace("%p ip:0x%x:%hu:%d:%p retrieved from cache, connections:%d", pData, ip, port, hash, pNode, pCache->count[hash]);
   }
 
   return pData;
diff --git a/src/rpc/src/rpcMain.c b/src/rpc/src/rpcMain.c
index 6a1ec786ff65e5440889d822fb07bb3e436cb3ef..fcbf9e406831e4a17bd24f9f32cea95c6c85bd59 100755
--- a/src/rpc/src/rpcMain.c
+++ b/src/rpc/src/rpcMain.c
@@ -57,7 +57,7 @@ typedef struct {
 
   void   (*cfp)(char type, void *pCont, int contLen, void *ahandle, int32_t code);
   int    (*afp)(char *meterId, char *spi, char *encrypt, char *secret, char *ckey); 
-  void   (*ufp)(void *ahandle, SRpcIpSet ipSet);
+  void   (*ufp)(void *ahandle, SRpcIpSet *pIpSet);
 
   void     *idPool;   // handle to ID pool
   void     *tmrCtrl;  // handle to timer
@@ -193,11 +193,7 @@ void *rpcOpen(SRpcInit *pInit) {
   if(pInit->label) strcpy(pRpc->label, pInit->label);
   pRpc->connType = pInit->connType;
   pRpc->idleTime = pInit->idleTime;
-  pRpc->numOfThreads = pInit->numOfThreads;
-  if (pRpc->numOfThreads > TSDB_MAX_RPC_THREADS) {
-    pRpc->numOfThreads = TSDB_MAX_RPC_THREADS;
-  }
-
+  pRpc->numOfThreads = pInit->numOfThreads>TSDB_MAX_RPC_THREADS ? TSDB_MAX_RPC_THREADS:pInit->numOfThreads;
   if (pInit->localIp) strcpy(pRpc->localIp, pInit->localIp);
   pRpc->localPort = pInit->localPort;
   pRpc->afp = pInit->afp;
@@ -300,7 +296,7 @@ void rpcFreeCont(void *cont) {
   free(msg);
 }
 
-void rpcSendRequest(void *shandle, SRpcIpSet ipSet, char type, void *pCont, int contLen, void *ahandle) {
+void rpcSendRequest(void *shandle, SRpcIpSet *pIpSet, char type, void *pCont, int contLen, void *ahandle) {
   SRpcInfo       *pRpc = (SRpcInfo *)shandle;
   SRpcReqContext *pContext;
 
@@ -308,11 +304,11 @@ void rpcSendRequest(void *shandle, SRpcIpSet ipSet, char type, void *pCont, int
   pContext = (SRpcReqContext *) (pCont-sizeof(SRpcHead)-sizeof(SRpcReqContext));
   pContext->ahandle = ahandle;
   pContext->pRpc = (SRpcInfo *)shandle;
-  pContext->ipSet = ipSet;
+  pContext->ipSet = *pIpSet;
   pContext->contLen = contLen;
   pContext->pCont = pCont;
   pContext->msgType = type;
-  pContext->oldIndex = ipSet.index;
+  pContext->oldIndex = pIpSet->index;
 
   rpcSendReqToServer(pRpc, pContext);
 
@@ -338,7 +334,7 @@ void rpcSendResponse(void *handle, int32_t code, void *pCont, int contLen) {
   pthread_mutex_lock(&pRpc->mutex);
 
   if ( pConn->inType == 0 || pConn->meterId[0] == 0 ) {
-    tTrace("%s pConn:%p, connection is already released, rsp wont be sent", pRpc->label, pConn);
+    tTrace("%s %p, connection is already released, rsp wont be sent", pRpc->label, pConn);
     pthread_mutex_lock(&pRpc->mutex);
     return;
   }
@@ -373,14 +369,14 @@ void rpcSendResponse(void *handle, int32_t code, void *pCont, int contLen) {
   return;
 }
 
-void rpcSendRedirectRsp(void *thandle, SRpcIpSet ipSet) {
+void rpcSendRedirectRsp(void *thandle, SRpcIpSet *pIpSet) {
   char     *pMsg;
   int       msgLen = sizeof(SRpcIpSet);
 
   pMsg = rpcMallocCont(msgLen);
   if (pMsg == NULL) return;
 
-  memcpy(pMsg, &ipSet, sizeof(ipSet));
+  memcpy(pMsg, pIpSet, sizeof(SRpcIpSet));
 
   rpcSendResponse(thandle, TSDB_CODE_REDIRECT, pMsg, msgLen);
 
@@ -401,10 +397,10 @@ static SRpcConn *rpcOpenConn(SRpcInfo *pRpc, char *peerIpStr, uint16_t peerPort)
     if (taosOpenConn[pRpc->connType]) {
       pConn->chandle = (*taosOpenConn[pRpc->connType])(pRpc->shandle, pConn, pConn->peerIpstr, pConn->peerPort);
       if (pConn->chandle) {
-        tTrace("%s pConn:%p, rpc connection is set up, sid:%d id:%s ip:%s:%hu localPort:%d", pRpc->label, 
+        tTrace("%s %p, rpc connection is set up, sid:%d id:%s ip:%s:%hu localPort:%d", pRpc->label, 
                 pConn, pConn->sid, pRpc->meterId, pConn->peerIpstr, pConn->peerPort, pConn->localPort);
       } else {
-        tError("%s pConn:%p, failed to set up nw connection to ip:%s:%hu", pRpc->label, pConn,
+        tError("%s %p, failed to set up nw connection to ip:%s:%hu", pRpc->label, pConn,
                pConn->sid, pRpc->meterId, pConn->peerIpstr, pConn->peerPort);
         terrno = TSDB_CODE_NETWORK_UNAVAIL;
         rpcCloseConn(pConn);
@@ -446,7 +442,7 @@ static void rpcCloseConn(void *thandle) {
     taosFreeId(pRpc->idPool, pConn->sid);
     pConn->pContext = NULL;
 
-    tTrace("%s pConn:%p, rpc connection is closed", pRpc->label, pConn);
+    tTrace("%s %p, rpc connection is closed", pRpc->label, pConn);
   }
 
   pthread_mutex_unlock(&pRpc->mutex);
@@ -460,8 +456,6 @@ static SRpcConn *rpcAllocateClientConn(SRpcInfo *pRpc) {
     tError("%s maximum number of sessions:%d is reached", pRpc->label, pRpc->sessions);
     terrno = TSDB_CODE_MAX_SESSIONS;
   } else {
-    tTrace("%s sid:%d, ID allocated, used:%d", pRpc->label, sid, taosIdPoolNumOfUsed(pRpc->idPool));
-
     pConn = pRpc->connList + sid;
     memset(pConn, 0, sizeof(SRpcConn));
 
@@ -498,7 +492,7 @@ static SRpcConn *rpcAllocateServerConn(SRpcInfo *pRpc, char *meterId, char *hash
     pConn->tranId = (uint16_t)(rand() & 0xFFFF);
     pConn->ownId = htonl(pConn->sid);
     if (pRpc->afp && (*pRpc->afp)(meterId, &pConn->spi, &pConn->encrypt, pConn->secret, pConn->ckey)) {
-      tWarn("%s pConn:%p, meterId not there", pRpc->label, pConn);
+      tWarn("%s %p, meterId not there", pRpc->label, pConn);
       taosFreeId(pRpc->idPool, sid);   // sid shall be released
       terrno = TSDB_CODE_INVALID_USER;
       pConn = NULL;
@@ -507,7 +501,7 @@ static SRpcConn *rpcAllocateServerConn(SRpcInfo *pRpc, char *meterId, char *hash
 
   if (pConn) {
     taosAddStrHash(pRpc->hash, hashstr, (char *)&pConn);
-    tTrace("%s pConn:%p, rpc connection is allocated, sid:%d id:%s", pRpc->label, pConn, sid, pConn->meterId);
+    tTrace("%s %p, rpc connection is allocated, sid:%d id:%s", pRpc->label, pConn, sid, pConn->meterId);
   }
 
   return pConn;
@@ -524,7 +518,7 @@ static SRpcConn *rpcGetConnObj(SRpcInfo *pRpc, int sid, char *meterId, char *has
 
   if (pConn) {
     if (memcmp(pConn->meterId, meterId, tListLen(pConn->meterId)) != 0) {
-      tTrace("%s pConn:%p, meterId:%s is not matched, received:%s", pRpc->label, pConn, pConn->meterId, meterId);
+      tTrace("%s %p, meterId:%s is not matched, received:%s", pRpc->label, pConn, pConn->meterId, meterId);
       terrno = TSDB_CODE_MISMATCHED_METER_ID;
       pConn = NULL;
     }
@@ -553,7 +547,7 @@ static int rpcProcessReqHead(SRpcConn *pConn, SRpcHead *pHead) {
       pConn->peerId = pHead->sourceId;
     } else {
       if (pConn->peerId != pHead->sourceId) {
-        tTrace("%s pConn:%p, source Id is changed, old:0x%08x new:0x%08x", pRpc->label, pConn, 
+        tTrace("%s %p, source Id is changed, old:0x%08x new:0x%08x", pRpc->label, pConn, 
                pConn->peerId, pHead->sourceId);
         return TSDB_CODE_INVALID_VALUE;
       }
@@ -561,14 +555,14 @@ static int rpcProcessReqHead(SRpcConn *pConn, SRpcHead *pHead) {
 
     if (pConn->inTranId == pHead->tranId) {
       if (pConn->inType == pHead->msgType) {
-        tTrace("%s pConn:%p, %s is retransmitted", pRpc->label, pConn, taosMsg[pHead->msgType]);
+        tTrace("%s %p, %s is retransmitted", pRpc->label, pConn, taosMsg[pHead->msgType]);
         rpcSendQuickRsp(pConn, TSDB_CODE_ACTION_IN_PROGRESS);
       } else if (pConn->inType == 0) {
-        tTrace("%s pConn:%p, %s is already processed, tranId:%d", pRpc->label, pConn, 
+        tTrace("%s %p, %s is already processed, tranId:%d", pRpc->label, pConn, 
                 taosMsg[pHead->msgType], pConn->inTranId);
         rpcSendMsgToPeer(pConn, pConn->pRspMsg, pConn->rspMsgLen); // resend the response
       } else {
-        tTrace("%s pConn:%p, mismatched message %s and tranId", pRpc->label, pConn, taosMsg[pHead->msgType]);
+        tTrace("%s %p, mismatched message %s and tranId", pRpc->label, pConn, taosMsg[pHead->msgType]);
       }
 
       // do not reply any message
@@ -576,7 +570,7 @@ static int rpcProcessReqHead(SRpcConn *pConn, SRpcHead *pHead) {
     }
 
     if (pConn->inType != 0) {
-      tTrace("%s pConn:%p, last session is not finished, inTranId:%d tranId:%d", pRpc->label, pConn, 
+      tTrace("%s %p, last session is not finished, inTranId:%d tranId:%d", pRpc->label, pConn, 
               pConn->inTranId, pHead->tranId);
       return TSDB_CODE_LAST_SESSION_NOT_FINISHED;
     }
@@ -613,7 +607,7 @@ static int rpcProcessRspHead(SRpcConn *pConn, SRpcHead *pHead) {
   if (*pHead->content == TSDB_CODE_ACTION_IN_PROGRESS || pHead->tcp) {
     if (pConn->tretry <= tsRpcMaxRetry) {
       pConn->tretry++;
-      tTrace("%s pConn:%p, peer is still processing the transaction", pRpc->label, pConn);
+      tTrace("%s %p, peer is still processing the transaction", pRpc->label, pConn);
       taosTmrReset(rpcProcessRetryTimer, tsRpcProgressTime, pConn, pRpc->tmrCtrl, &pConn->pTimer);
       return TSDB_CODE_ALREADY_PROCESSED;
     } else {
@@ -669,7 +663,7 @@ static int32_t rpcProcessHead(SRpcInfo *pRpc, SRpcConn **ppConn, void *data, int
   if (pHead->uid) pConn->peerUid = pHead->uid;
 
   if (pHead->tcp) {
-    tTrace("%s pConn:%p, content will be transfered via TCP", pRpc->label, pConn);
+    tTrace("%s %p, content will be transfered via TCP", pRpc->label, pConn);
     if (pConn->outType) taosTmrReset(rpcProcessRetryTimer, tsRpcTimer, pConn, pRpc->tmrCtrl, &pConn->pTimer);
     return TSDB_CODE_ALREADY_PROCESSED;
   }
@@ -690,14 +684,32 @@ static int32_t rpcProcessHead(SRpcInfo *pRpc, SRpcConn **ppConn, void *data, int
   return code;
 }
 
+static void rpcProcessBrokenLink(SRpcConn *pConn) {
+  SRpcInfo *pRpc = pConn->pRpc;
+  
+  if (pConn->outType) {
+    SRpcReqContext *pContext = pConn->pContext;
+    pContext->code = TSDB_CODE_NETWORK_UNAVAIL;
+    taosTmrStart(rpcProcessConnError, 0, pContext, pRpc->tmrCtrl);
+  }
+ 
+  rpcCloseConn(pConn);
+}
+
 static void *rpcProcessMsgFromPeer(void *msg, int msgLen, uint32_t ip, uint16_t port, void *shandle, void *thandle, void *chandle) {
   SRpcHead  *pHead = (SRpcHead *)msg;
   SRpcInfo  *pRpc = (SRpcInfo *)shandle;
-  SRpcConn  *pConn = NULL;
+  SRpcConn  *pConn = (SRpcConn *)thandle;
   int32_t    code = 0;
 
   tDump(msg, msgLen);
 
+  if (ip==0 && pConn) {
+    rpcProcessBrokenLink(pConn); 
+    tfree(msg);
+    return NULL;
+  }
+
   pthread_mutex_lock(&pRpc->mutex);
 
   code = rpcProcessHead(pRpc, &pConn, msg, msgLen, ip);
@@ -720,7 +732,7 @@ static void *rpcProcessMsgFromPeer(void *msg, int msgLen, uint32_t ip, uint16_t
   pthread_mutex_unlock(&pRpc->mutex);
 
   if (pHead->msgType < TSDB_MSG_TYPE_HEARTBEAT || (rpcDebugFlag & 16)) {
-    tTrace("%s pConn:%p, %s received from 0x%x:%hu, parse code:%x len:%d source:0x%08x dest:0x%08x tranId:%d",
+    tTrace("%s %p, %s received from 0x%x:%hu, parse code:%x len:%d source:0x%08x dest:0x%08x tranId:%d",
         pRpc->label, pConn, taosMsg[pHead->msgType], ip, port, code, 
         msgLen, pHead->sourceId, pHead->destId, pHead->tranId);
   }
@@ -733,7 +745,7 @@ static void *rpcProcessMsgFromPeer(void *msg, int msgLen, uint32_t ip, uint16_t
     if (code != 0) { // parsing error
       if ( rpcIsReq(pHead->msgType) ) {
         rpcSendErrorMsgToPeer(pRpc, msg, code, ip, port, chandle);
-        tTrace("%s pConn:%p, %s is sent with error code:%x", pRpc->label, pConn, taosMsg[pHead->msgType+1], code);
+        tTrace("%s %p, %s is sent with error code:%x", pRpc->label, pConn, taosMsg[pHead->msgType+1], code);
       } 
     } else { // parsing OK
       rpcProcessIncomingMsg(pConn, pHead);
@@ -764,12 +776,13 @@ static void rpcProcessIncomingMsg(SRpcConn *pConn, SRpcHead *pHead) {
       pContext->redirect = 1;
       pContext->numOfTry = 0;
       memcpy(&pContext->ipSet, pHead->content, sizeof(pContext->ipSet));
+      tTrace("%s %p, redirect is received, numOfIps:%d", pRpc->label, pConn, pContext->ipSet.numOfIps);
       rpcSendReqToServer(pRpc, pContext);
     } else {
-      rpcFreeOutMsg(rpcHeadFromCont(pContext->pCont)); // free the request msg
       if ( pRpc->ufp && (pContext->ipSet.index != pContext->oldIndex || pContext->redirect) ) 
-        (*pRpc->ufp)(pContext->ahandle, pContext->ipSet);  // notify the update of ipSet
+        (*pRpc->ufp)(pContext->ahandle, &pContext->ipSet);  // notify the update of ipSet
       (*pRpc->cfp)(pHead->msgType, pCont, contLen, pContext->ahandle, code);
+      rpcFreeOutMsg(rpcHeadFromCont(pContext->pCont)); // free the request msg
     }
   }
 }
@@ -885,12 +898,12 @@ static void rpcSendMsgToPeer(SRpcConn *pConn, void *msg, int msgLen) {
 
   if ( rpcIsReq(pHead->msgType)) {
     if (pHead->msgType < TSDB_MSG_TYPE_HEARTBEAT || (rpcDebugFlag & 16))
-      tTrace("%s pConn:%p, %s is sent to %s:%hu, len:%d source:0x%08x dest:0x%08x tranId:%d",
+      tTrace("%s %p, %s is sent to %s:%hu, len:%d source:0x%08x dest:0x%08x tranId:%d",
              pRpc->label, pConn, taosMsg[pHead->msgType], pConn->peerIpstr,
              pConn->peerPort, msgLen, pHead->sourceId, pHead->destId, pHead->tranId);
   } else {
     if (pHead->msgType < TSDB_MSG_TYPE_HEARTBEAT || (rpcDebugFlag & 16))
-      tTrace( "%s pConn:%p, %s is sent to %s:%hu, code:%u len:%d source:0x%08x dest:0x%08x tranId:%d",
+      tTrace( "%s %p, %s is sent to %s:%hu, code:%u len:%d source:0x%08x dest:0x%08x tranId:%d",
           pRpc->label, pConn, taosMsg[pHead->msgType], pConn->peerIpstr, pConn->peerPort, 
           (uint8_t)pHead->content[0], msgLen, pHead->sourceId, pHead->destId, pHead->tranId);
   }
@@ -898,7 +911,7 @@ static void rpcSendMsgToPeer(SRpcConn *pConn, void *msg, int msgLen) {
   writtenLen = (*taosSendData[pRpc->connType])(pConn->peerIp, pConn->peerPort, (char *)pHead, msgLen, pConn->chandle);
 
   if (writtenLen != msgLen) {
-    tError("%s pConn:%p, failed to send, dataLen:%d writtenLen:%d, reason:%s", pRpc->label, pConn, 
+    tError("%s %p, failed to send, dataLen:%d writtenLen:%d, reason:%s", pRpc->label, pConn, 
            msgLen, writtenLen, strerror(errno));
   }
  
@@ -928,23 +941,23 @@ static void rpcProcessRetryTimer(void *param, void *tmrId) {
   pthread_mutex_lock(&pRpc->mutex);
 
   if (pConn->outType && pConn->meterId[0]) {
-    tTrace("%s pConn:%p, expected %s is not received", pRpc->label, pConn, taosMsg[(int)pConn->outType + 1]);
+    tTrace("%s %p, expected %s is not received", pRpc->label, pConn, taosMsg[(int)pConn->outType + 1]);
     pConn->pTimer = NULL;
     pConn->retry++;
 
     if (pConn->retry < 4) {
-      tTrace("%s pConn:%p, re-send msg:%s to %s:%hu", pRpc->label, pConn, 
+      tTrace("%s %p, re-send msg:%s to %s:%hu", pRpc->label, pConn, 
              taosMsg[pConn->outType], pConn->peerIpstr, pConn->peerPort);
       rpcSendMsgToPeer(pConn, pConn->pReqMsg, pConn->reqMsgLen);      
       taosTmrReset(rpcProcessRetryTimer, tsRpcTimer<<pConn->retry, pConn, pRpc->tmrCtrl, &pConn->pTimer);
     } else {
       // close the connection
-      tTrace("%s pConn:%p, failed to send msg:%s to %s:%hu", pRpc->label, pConn,
+      tTrace("%s %p, failed to send msg:%s to %s:%hu", pRpc->label, pConn,
               taosMsg[pConn->outType], pConn->peerIpstr, pConn->peerPort);
       reportDisc = 1;
     }
   } else {
-    tTrace("%s pConn:%p, retry timer not processed", pRpc->label, pConn);
+    tTrace("%s %p, retry timer not processed", pRpc->label, pConn);
   }
 
   pthread_mutex_unlock(&pRpc->mutex);
@@ -961,10 +974,10 @@ static void rpcProcessIdleTimer(void *param, void *tmrId) {
   SRpcInfo *pRpc = pConn->pRpc;
 
   if (pConn->meterId[0]) {
-    tTrace("%s pConn:%p, close the connection since no activity", pRpc->label, pConn);
+    tTrace("%s %p, close the connection since no activity", pRpc->label, pConn);
     rpcCloseConn(pConn);
   } else {
-    tTrace("%s pConn:%p, idle timer:%p not processed", pRpc->label, pConn, tmrId);
+    tTrace("%s %p, idle timer:%p not processed", pRpc->label, pConn, tmrId);
   }
 }
 
@@ -975,11 +988,11 @@ static void rpcProcessProgressTimer(void *param, void *tmrId) {
   pthread_mutex_lock(&pRpc->mutex);
 
   if (pConn->inType && pConn->meterId[0]) {
-    tTrace("%s pConn:%p, progress timer expired, send progress", pRpc->label, pConn);
+    tTrace("%s %p, progress timer expired, send progress", pRpc->label, pConn);
     rpcSendQuickRsp(pConn, TSDB_CODE_ACTION_IN_PROGRESS);
     taosTmrReset(rpcProcessProgressTimer, tsRpcTimer<<pConn->retry, pConn, pRpc->tmrCtrl, &pConn->pTimer);
   } else {
-    tTrace("%s pConn:%p, progress timer:%p not processed", pRpc->label, pConn, tmrId);
+    tTrace("%s %p, progress timer:%p not processed", pRpc->label, pConn, tmrId);
   }
 
   pthread_mutex_unlock(&pRpc->mutex);
@@ -1124,12 +1137,12 @@ static int rpcCheckAuthentication(SRpcConn *pConn, char *msg, int msgLen) {
     delta = (int32_t)htonl(pDigest->timeStamp);
     delta -= (int32_t)taosGetTimestampSec();
     if (abs(delta) > 900) {
-      tWarn("%s pConn:%p, time diff:%d is too big, msg discarded, timestamp:%d", pRpc->label, pConn,
+      tWarn("%s %p, time diff:%d is too big, msg discarded, timestamp:%d", pRpc->label, pConn,
              delta, htonl(pDigest->timeStamp));
       code = TSDB_CODE_INVALID_TIME_STAMP;
     } else {
       if (rpcAuthenticateMsg((uint8_t *)pHead, msgLen - TSDB_AUTH_LEN, pDigest->auth, (uint8_t *)pConn->secret) < 0) {
-        tError("%s pConn:%p, authentication failed, msg discarded", pRpc->label, pConn);
+        tError("%s %p, authentication failed, msg discarded", pRpc->label, pConn);
         code = TSDB_CODE_AUTH_FAILURE;
       } else {
         pHead->msgLen -= sizeof(SRpcDigest);
@@ -1138,7 +1151,7 @@ static int rpcCheckAuthentication(SRpcConn *pConn, char *msg, int msgLen) {
   } else {
     // if it is request or response with code 0, msg shall be discarded
     if (rpcIsReq(pHead->msgType) || (pHead->content[0] == 0)) {
-      tTrace("%s pConn:%p, auth spi not matched, msg discarded", pRpc->label, pConn);
+      tTrace("%s %p, auth spi not matched, msg discarded", pRpc->label, pConn);
       code = TSDB_CODE_AUTH_FAILURE;
     }
   }
diff --git a/src/rpc/test/rclient.c b/src/rpc/test/rclient.c
index 166cf10a91ba9bd5fef39e98a9bbe855939217a5..8092e06d011d54e31c14e83999152c9cce722367 100644
--- a/src/rpc/test/rclient.c
+++ b/src/rpc/test/rclient.c
@@ -17,10 +17,15 @@
 #include "os.h"
 #include "tlog.h"
 #include "trpc.h"
+#include "taoserror.h"
 #include <stdint.h>
 
 void processMsg(char type, void *pCont, int contLen, void *ahandle, int32_t code) {
-  dPrint("response is received, type:%d, contLen:%d code:%x, ahandle:%p", type, contLen, code, ahandle);
+  dPrint("response is received, type:%d, contLen:%d code:%x:%s", type, contLen, code, tstrerror(code));
+}
+
+void processUpdate(void *handle, SRpcIpSet *pIpSet) {
+  dPrint("ip set is changed, index:%d", pIpSet->index);
 }
 
 int32_t main(int32_t argc, char *argv[]) {
@@ -35,6 +40,7 @@ int32_t main(int32_t argc, char *argv[]) {
   rpcInit.label        = "APP";
   rpcInit.numOfThreads = 1;
   rpcInit.cfp          = processMsg;
+  rpcInit.ufp          = processUpdate;
   rpcInit.sessions     = 1000;
   rpcInit.connType     = TAOS_CONN_UDPC;
   rpcInit.idleTime     = 2000;
@@ -52,11 +58,11 @@ int32_t main(int32_t argc, char *argv[]) {
   ipSet.numOfIps = 2;
   ipSet.index = 0;
   ipSet.port = 7000;
-  ipSet.ip[0] = inet_addr("127.0.0.1");
-  ipSet.ip[1] = inet_addr("192.168.0.1");
+  ipSet.ip[0] = inet_addr("192.168.0.1");
+  ipSet.ip[1] = inet_addr("127.0.0.1");
 
   void *cont = rpcMallocCont(100); 
-  rpcSendRequest(pRpc, ipSet, 1, cont, 100, 1);
+  rpcSendRequest(pRpc, &ipSet, 1, cont, 100, 1);
 
   getchar();
 
diff --git a/src/rpc/test/rserver.c b/src/rpc/test/rserver.c
index 85994a04d0dd471490ba7797e2a1b3ec3e49eacf..d62550592d59a692f15afe1ec26306d2fde793af 100644
--- a/src/rpc/test/rserver.c
+++ b/src/rpc/test/rserver.c
@@ -22,7 +22,17 @@
 void processMsg(char type, void *pCont, int contLen, void *ahandle, int32_t code) {
   dPrint("request is received, type:%d, contLen:%d", type, contLen);
   void *rsp = rpcMallocCont(128);
-  rpcSendResponse(ahandle, 1, rsp, 128);
+
+  //rpcSendResponse(ahandle, 1, rsp, 128);
+
+  SRpcIpSet ipSet;
+  ipSet.numOfIps = 1;
+  ipSet.index = 0;
+  ipSet.port = 7000;
+  ipSet.ip[0] = inet_addr("192.168.0.2");
+
+  rpcSendRedirectRsp(ahandle, &ipSet);
+
   rpcFreeCont(pCont);
 }