diff --git a/src/client/inc/tsclient.h b/src/client/inc/tsclient.h
index ef8184990df0d4cb23b928ba1acb4bf9f44e23e5..b5455ed1fb3c1c81a662376b0f8308a1a64c46ba 100644
--- a/src/client/inc/tsclient.h
+++ b/src/client/inc/tsclient.h
@@ -52,12 +52,20 @@ typedef struct STableComInfo {
   int32_t rowSize;
 } STableComInfo;
 
+typedef struct SCMCorVgroupInfo {
+  int32_t version;
+  int8_t inUse;
+  int8_t  numOfEps;
+  SEpAddr epAddr[TSDB_MAX_REPLICA];
+} SCMCorVgroupInfo;
+
 typedef struct STableMeta {
   STableComInfo tableInfo;
   uint8_t       tableType;
   int16_t       sversion;
   int16_t       tversion;
-  SCMVgroupInfo vgroupInfo;
+  SCMVgroupInfo  vgroupInfo;
+  SCMCorVgroupInfo  corVgroupInfo;
   int32_t       sid;       // the index of one table in a virtual node
   uint64_t      uid;       // unique id of a table
   SSchema       schema[];  // if the table is TSDB_CHILD_TABLE, schema is acquired by super table meta info
@@ -456,7 +464,8 @@ extern void *    tscQhandle;
 extern int       tscKeepConn[];
 extern int       tsInsertHeadSize;
 extern int       tscNumOfThreads;
-extern SRpcEpSet tscMgmtEpSet;
+  
+extern SRpcCorEpSet tscMgmtEpSet;
 
 extern int (*tscBuildMsg[TSDB_SQL_MAX])(SSqlObj *pSql, SSqlInfo *pInfo);
 
diff --git a/src/client/src/tscSchemaUtil.c b/src/client/src/tscSchemaUtil.c
index 934a562387f26a95ec1508c5cfbd4633137cac9e..9b8f48b109eb773a4808ec95231e175d613ec6c0 100644
--- a/src/client/src/tscSchemaUtil.c
+++ b/src/client/src/tscSchemaUtil.c
@@ -140,7 +140,15 @@ struct SSchema tscGetTbnameColumnSchema() {
   strcpy(s.name, TSQL_TBNAME_L);
   return s;
 }
-
+static void tscInitCorVgroupInfo(SCMCorVgroupInfo *corVgroupInfo, SCMVgroupInfo *vgroupInfo) {
+  corVgroupInfo->version = 0;
+  corVgroupInfo->inUse = 0;
+  corVgroupInfo->numOfEps = vgroupInfo->numOfEps;
+  for (int32_t i = 0; i < corVgroupInfo->numOfEps; i++) {
+    strncpy(corVgroupInfo->epAddr[i].fqdn, vgroupInfo->epAddr[i].fqdn, TSDB_FQDN_LEN);
+    corVgroupInfo->epAddr[i].port = vgroupInfo->epAddr[i].port;
+  }
+}
 STableMeta* tscCreateTableMetaFromMsg(STableMetaMsg* pTableMetaMsg, size_t* size) {
   assert(pTableMetaMsg != NULL);
   
@@ -157,6 +165,9 @@ STableMeta* tscCreateTableMetaFromMsg(STableMetaMsg* pTableMetaMsg, size_t* size
   pTableMeta->sid = pTableMetaMsg->sid;
   pTableMeta->uid = pTableMetaMsg->uid;
   pTableMeta->vgroupInfo = pTableMetaMsg->vgroup;
+
+  tscInitCorVgroupInfo(&pTableMeta->corVgroupInfo, &pTableMeta->vgroupInfo);
+
   pTableMeta->sversion = pTableMetaMsg->sversion;
   pTableMeta->tversion = pTableMetaMsg->tversion;
   
diff --git a/src/client/src/tscServer.c b/src/client/src/tscServer.c
index 398dea9d097da089a48a613ca3aeba194c38abb5..d9922b8718b832de9f37073f27d44a9502e5da6c 100644
--- a/src/client/src/tscServer.c
+++ b/src/client/src/tscServer.c
@@ -26,10 +26,11 @@
 #include "ttime.h"
 #include "ttimer.h"
 #include "tutil.h"
+#include "tlockfree.h"
 
 #define TSC_MGMT_VNODE 999
 
-SRpcEpSet  tscMgmtEpSet;
+SRpcCorEpSet  tscMgmtEpSet;
 SRpcEpSet  tscDnodeEpSet;
 
 int (*tscBuildMsg[TSDB_SQL_MAX])(SSqlObj *pSql, SSqlInfo *pInfo) = {0};
@@ -51,37 +52,78 @@ static void tscSetDnodeEpSet(SSqlObj* pSql, SCMVgroupInfo* pVgroupInfo) {
     pEpSet->numOfEps = 0;
     return;
   }
-  
+
   pEpSet->numOfEps = pVgroupInfo->numOfEps;
   for(int32_t i = 0; i < pVgroupInfo->numOfEps; ++i) {
     strcpy(pEpSet->fqdn[i], pVgroupInfo->epAddr[i].fqdn);
     pEpSet->port[i] = pVgroupInfo->epAddr[i].port;
   }
 }
-
-void tscPrintMgmtEp() {
-  if (tscMgmtEpSet.numOfEps <= 0) {
-    tscError("invalid mnode EP list:%d", tscMgmtEpSet.numOfEps);
-  } else {
-    for (int i = 0; i < tscMgmtEpSet.numOfEps; ++i) {
-      tscDebug("mnode index:%d %s:%d", i, tscMgmtEpSet.fqdn[i], tscMgmtEpSet.port[i]);
-    }
+static void tscDumpMgmtEpSet(SRpcEpSet *epSet) {
+  taosCorBeginRead(&tscMgmtEpSet.version);
+  *epSet = tscMgmtEpSet.epSet;
+  taosCorEndRead(&tscMgmtEpSet.version);
+}  
+static void tscEpSetHtons(SRpcEpSet *s) {
+   for (int32_t i = 0; i < s->numOfEps; i++) {
+      s->port[i] = htons(s->port[i]);    
+   }
+} 
+bool tscEpSetIsEqual(SRpcEpSet *s1, SRpcEpSet *s2) {
+   if (s1->numOfEps != s2->numOfEps || s1->inUse != s2->inUse) {
+     return false;
+   } 
+   for (int32_t i = 0; i < s1->numOfEps; i++) {
+     if (s1->port[i] != s2->port[i] 
+        || strncmp(s1->fqdn[i], s2->fqdn[i], TSDB_FQDN_LEN) != 0)
+        return false;
+   }
+   return true;
+}
+void tscUpdateMgmtEpSet(SRpcEpSet *pEpSet) {
+  // no need to update if equal
+  taosCorBeginWrite(&tscMgmtEpSet.version);
+  tscMgmtEpSet.epSet = *pEpSet;
+  taosCorEndWrite(&tscMgmtEpSet.version);
+}
+static void tscDumpEpSetFromVgroupInfo(SCMCorVgroupInfo *pVgroupInfo, SRpcEpSet *pEpSet) {
+  if (pVgroupInfo == NULL) { return;}
+  taosCorBeginRead(&pVgroupInfo->version);
+  int8_t inUse = pVgroupInfo->inUse;
+  pEpSet->inUse = (inUse >= 0 && inUse < TSDB_MAX_REPLICA) ? inUse: 0; 
+  pEpSet->numOfEps = pVgroupInfo->numOfEps;  
+  for (int32_t i = 0; i < pVgroupInfo->numOfEps; ++i) {
+    strncpy(pEpSet->fqdn[i], pVgroupInfo->epAddr[i].fqdn, TSDB_FQDN_LEN);
+    pEpSet->port[i] = pVgroupInfo->epAddr[i].port;
   }
+  taosCorEndRead(&pVgroupInfo->version);
 }
 
-void tscSetMgmtEpSet(SRpcEpSet *pEpSet) {
-  tscMgmtEpSet.numOfEps = pEpSet->numOfEps;
-  tscMgmtEpSet.inUse = pEpSet->inUse;
-  for (int32_t i = 0; i < tscMgmtEpSet.numOfEps; ++i) {
-    tscMgmtEpSet.port[i] = htons(pEpSet->port[i]);
+static void tscUpdateVgroupInfo(SSqlObj *pObj, SRpcEpSet *pEpSet) {
+  SSqlCmd *pCmd = &pObj->cmd;
+  STableMetaInfo *pTableMetaInfo = tscGetTableMetaInfoFromCmd(pCmd, pCmd->clauseIndex, 0);
+  if (pTableMetaInfo == NULL || pTableMetaInfo->pTableMeta == NULL) { return;}
+  SCMCorVgroupInfo *pVgroupInfo = &pTableMetaInfo->pTableMeta->corVgroupInfo;
+
+  taosCorBeginWrite(&pVgroupInfo->version);
+  //TODO(dengyihao), dont care vgid 
+  pVgroupInfo->inUse = pEpSet->inUse;
+  pVgroupInfo->numOfEps = pEpSet->numOfEps;
+  for (int32_t i = 0; pVgroupInfo->numOfEps; i++) {
+    strncpy(pVgroupInfo->epAddr[i].fqdn, pEpSet->fqdn[i], TSDB_FQDN_LEN);
+    pVgroupInfo->epAddr[i].port = pEpSet->port[i];
   }
+  taosCorEndWrite(&pVgroupInfo->version);
 }
-
-void tscUpdateEpSet(void *ahandle, SRpcEpSet *pEpSet) {
-  tscMgmtEpSet = *pEpSet;
-  tscDebug("mnode EP list is changed for ufp is called, numOfEps:%d inUse:%d", tscMgmtEpSet.numOfEps, tscMgmtEpSet.inUse);
-  for (int32_t i = 0; i < tscMgmtEpSet.numOfEps; ++i) {
-    tscDebug("index:%d fqdn:%s port:%d", i, tscMgmtEpSet.fqdn[i], tscMgmtEpSet.port[i]);
+void tscPrintMgmtEp() {
+  SRpcEpSet dump;
+  tscDumpMgmtEpSet(&dump);
+  if (dump.numOfEps <= 0) {
+    tscError("invalid mnode EP list:%d", dump.numOfEps);
+  } else {
+    for (int i = 0; i < dump.numOfEps; ++i) {
+      tscDebug("mnode index:%d %s:%d", i, dump.fqdn[i], dump.port[i]);
+    }
   }
 }
 
@@ -95,7 +137,9 @@ void tscUpdateEpSet(void *ahandle, SRpcEpSet *pEpSet) {
 UNUSED_FUNC
 static int32_t tscGetMgmtConnMaxRetryTimes() {
   int32_t factor = 2;
-  return tscMgmtEpSet.numOfEps * factor;
+  SRpcEpSet dump;
+  tscDumpMgmtEpSet(&dump);
+  return dump.numOfEps * factor;
 }
 
 void tscProcessHeartBeatRsp(void *param, TAOS_RES *tres, int code) {
@@ -111,9 +155,11 @@ void tscProcessHeartBeatRsp(void *param, TAOS_RES *tres, int code) {
 
   if (code == 0) {
     SCMHeartBeatRsp *pRsp = (SCMHeartBeatRsp *)pRes->pRsp;
-    SRpcEpSet *      pEpSet = &pRsp->epSet;
-    if (pEpSet->numOfEps > 0) 
-      tscSetMgmtEpSet(pEpSet);
+    SRpcEpSet *      epSet = &pRsp->epSet;
+    if (epSet->numOfEps > 0) {
+      tscEpSetHtons(epSet);
+      tscUpdateMgmtEpSet(epSet);
+    } 
 
     pSql->pTscObj->connId = htonl(pRsp->connId);
 
@@ -185,7 +231,7 @@ int tscSendMsgToServer(SSqlObj *pSql) {
 
   // set the mgmt ip list
   if (pSql->cmd.command >= TSDB_SQL_MGMT) {
-    pSql->epSet = tscMgmtEpSet;
+    tscDumpMgmtEpSet(&pSql->epSet);
   }
 
   memcpy(pMsg, pSql->cmd.payload, pSql->cmd.payloadLen);
@@ -236,10 +282,16 @@ void tscProcessMsgFromServer(SRpcMsg *rpcMsg, SRpcEpSet *pEpSet) {
     return;
   }
 
-  if (pCmd->command < TSDB_SQL_MGMT) {
-    if (pEpSet) pSql->epSet = *pEpSet;
-  } else {
-    if (pEpSet) tscMgmtEpSet = *pEpSet;
+  if (pEpSet) { 
+    //SRpcEpSet dump; 
+    tscEpSetHtons(pEpSet); 
+    if (tscEpSetIsEqual(&pSql->epSet, pEpSet)) {
+      if(pCmd->command < TSDB_SQL_MGMT)  { 
+        tscUpdateVgroupInfo(pSql, pEpSet); 
+      } else {
+        tscUpdateMgmtEpSet(pEpSet);
+    }
+    }
   }
 
   if (rpcMsg->pCont == NULL) {
@@ -421,7 +473,8 @@ int tscProcessSql(SSqlObj *pSql) {
       return pSql->res.code;
     }
   } else if (pCmd->command < TSDB_SQL_LOCAL) {
-    pSql->epSet = tscMgmtEpSet;
+
+    //pSql->epSet = tscMgmtEpSet;
   } else {  // local handler
     return (*tscProcessMsgRsp[pCmd->command])(pSql);
   }
@@ -525,8 +578,8 @@ int tscBuildSubmitMsg(SSqlObj *pSql, SSqlInfo *pInfo) {
 
   // pSql->cmd.payloadLen is set during copying data into payload
   pSql->cmd.msgType = TSDB_MSG_TYPE_SUBMIT;
-  tscSetDnodeEpSet(pSql, &pTableMeta->vgroupInfo);
-  
+  tscDumpEpSetFromVgroupInfo(&pTableMeta->corVgroupInfo, &pSql->epSet);
+
   tscDebug("%p build submit msg, vgId:%d numOfTables:%d numberOfEP:%d", pSql, vgId, pSql->cmd.numOfTablesInSubmit,
       pSql->epSet.numOfEps);
   return TSDB_CODE_SUCCESS;
@@ -567,11 +620,11 @@ static char *doSerializeTableInfo(SQueryTableMsg* pQueryMsg, SSqlObj *pSql, char
     } else {
       pVgroupInfo = &pTableMeta->vgroupInfo;
     }
-
     tscSetDnodeEpSet(pSql, pVgroupInfo);
+
     if (pVgroupInfo != NULL) {
       pQueryMsg->head.vgId = htonl(pVgroupInfo->vgId);
-    }
+    } 
 
     STableIdInfo *pTableIdInfo = (STableIdInfo *)pMsg;
     pTableIdInfo->tid = htonl(pTableMeta->sid);
@@ -588,8 +641,8 @@ static char *doSerializeTableInfo(SQueryTableMsg* pQueryMsg, SSqlObj *pSql, char
     tscDebug("%p query on stable, vgIndex:%d, numOfVgroups:%d", pSql, index, numOfVgroups);
 
     SVgroupTableInfo* pTableIdList = taosArrayGet(pTableMetaInfo->pVgroupTables, index);
-    
-    // set the vgroup info
+
+    // set the vgroup info 
     tscSetDnodeEpSet(pSql, &pTableIdList->vgInfo);
     pQueryMsg->head.vgId = htonl(pTableIdList->vgInfo.vgId);
     
@@ -1136,11 +1189,11 @@ int32_t tscBuildShowMsg(SSqlObj *pSql, SSqlInfo *pInfo) {
       pShowMsg->payloadLen = htons(pPattern->n);
     }
   } else {
-    SSQLToken *pIpAddr = &pShowInfo->prefix;
-    assert(pIpAddr->n > 0 && pIpAddr->type > 0);
+    SSQLToken *pEpAddr = &pShowInfo->prefix;
+    assert(pEpAddr->n > 0 && pEpAddr->type > 0);
 
-    strncpy(pShowMsg->payload, pIpAddr->z, pIpAddr->n);
-    pShowMsg->payloadLen = htons(pIpAddr->n);
+    strncpy(pShowMsg->payload, pEpAddr->z, pEpAddr->n);
+    pShowMsg->payloadLen = htons(pEpAddr->n);
   }
 
   pCmd->payloadLen = sizeof(SCMShowMsg) + pShowMsg->payloadLen;
@@ -1323,7 +1376,7 @@ int tscBuildUpdateTagMsg(SSqlObj* pSql, SSqlInfo *pInfo) {
   SQueryInfo *    pQueryInfo = tscGetQueryInfoDetail(pCmd, 0);
   STableMetaInfo *pTableMetaInfo = tscGetMetaInfo(pQueryInfo, 0);
 
-  tscSetDnodeEpSet(pSql, &pTableMetaInfo->pTableMeta->vgroupInfo);
+  tscDumpEpSetFromVgroupInfo(&pTableMetaInfo->pTableMeta->corVgroupInfo, &pSql->epSet);
 
   return TSDB_CODE_SUCCESS;
 }
@@ -1847,13 +1900,14 @@ int tscProcessSTableVgroupRsp(SSqlObj *pSql) {
 
     memcpy(pInfo->vgroupList, pVgroupInfo, size);
     for (int32_t j = 0; j < pInfo->vgroupList->numOfVgroups; ++j) {
+      //just init, no need to lock
       SCMVgroupInfo *pVgroups = &pInfo->vgroupList->vgroups[j];
-
       pVgroups->vgId = htonl(pVgroups->vgId);
       assert(pVgroups->numOfEps >= 1);
 
       for (int32_t k = 0; k < pVgroups->numOfEps; ++k) {
         pVgroups->epAddr[k].port = htons(pVgroups->epAddr[k].port);
+
       }
 
       pMsg += size;
@@ -1946,8 +2000,10 @@ int tscProcessConnectRsp(SSqlObj *pSql) {
   assert(len <= sizeof(pObj->db));
   tstrncpy(pObj->db, temp, sizeof(pObj->db));
   
-  if (pConnect->epSet.numOfEps > 0) 
-    tscSetMgmtEpSet(&pConnect->epSet);
+  if (pConnect->epSet.numOfEps > 0) {
+    tscEpSetHtons(&pConnect->epSet);
+    tscUpdateMgmtEpSet(&pConnect->epSet);
+  } 
 
   strcpy(pObj->sversion, pConnect->serverVersion);
   pObj->writeAuth = pConnect->writeAuth;
diff --git a/src/client/src/tscSql.c b/src/client/src/tscSql.c
index 6a14d3a65e33b4f5edf8feafcbb909723bf8bdb2..5848b7b82f086a7fdc77a93fdf8a2c64b8c39696 100644
--- a/src/client/src/tscSql.c
+++ b/src/client/src/tscSql.c
@@ -63,7 +63,7 @@ SSqlObj *taosConnectImpl(const char *ip, const char *user, const char *pass, con
 
   if (ip) {
     if (tscSetMgmtEpSetFromCfg(ip, NULL) < 0) return NULL;
-    if (port) tscMgmtEpSet.port[0] = port;
+    if (port) tscMgmtEpSet.epSet.port[0] = port;
   } 
  
   void *pDnodeConn = NULL;
diff --git a/src/client/src/tscSystem.c b/src/client/src/tscSystem.c
index 7722acf0d07bdddc994787f8343fff7309053086..5662b4a8856e638ebb41c0e21b5e23647494224c 100644
--- a/src/client/src/tscSystem.c
+++ b/src/client/src/tscSystem.c
@@ -41,7 +41,7 @@ int tscNumOfThreads;
 
 static pthread_once_t tscinit = PTHREAD_ONCE_INIT;
 void taosInitNote(int numOfNoteLines, int maxNotes, char* lable);
-void tscUpdateEpSet(void *ahandle, SRpcEpSet *pEpSet);
+//void tscUpdateEpSet(void *ahandle, SRpcEpSet *pEpSet);
 
 void tscCheckDiskUsage(void *UNUSED_PARAM(para), void* UNUSED_PARAM(param)) {
   taosGetDisk();
diff --git a/src/client/src/tscUtil.c b/src/client/src/tscUtil.c
index 4e6133663eb0d7d2ae7908eb2622a665e6010008..957bdeeb7f0e329ca1cad49e17daf031d0850ee6 100644
--- a/src/client/src/tscUtil.c
+++ b/src/client/src/tscUtil.c
@@ -2146,16 +2146,19 @@ char* strdup_throw(const char* str) {
 }
 
 int tscSetMgmtEpSetFromCfg(const char *first, const char *second) {
-  tscMgmtEpSet.numOfEps = 0;
-  tscMgmtEpSet.inUse = 0;
+  // init mgmt ip set 
+  tscMgmtEpSet.version = 0;
+  SRpcEpSet *mgmtEpSet = &(tscMgmtEpSet.epSet);
+  mgmtEpSet->numOfEps = 0;
+  mgmtEpSet->inUse = 0;
 
   if (first && first[0] != 0) {
     if (strlen(first) >= TSDB_EP_LEN) {
       terrno = TSDB_CODE_TSC_INVALID_FQDN;
       return -1;
     }
-    taosGetFqdnPortFromEp(first, tscMgmtEpSet.fqdn[tscMgmtEpSet.numOfEps], &tscMgmtEpSet.port[tscMgmtEpSet.numOfEps]);
-    tscMgmtEpSet.numOfEps++;
+    taosGetFqdnPortFromEp(first, mgmtEpSet->fqdn[mgmtEpSet->numOfEps], &(mgmtEpSet->port[mgmtEpSet->numOfEps]));
+    mgmtEpSet->numOfEps++;
   }
 
   if (second && second[0] != 0) {
@@ -2163,11 +2166,11 @@ int tscSetMgmtEpSetFromCfg(const char *first, const char *second) {
       terrno = TSDB_CODE_TSC_INVALID_FQDN;
       return -1;
     }
-    taosGetFqdnPortFromEp(second, tscMgmtEpSet.fqdn[tscMgmtEpSet.numOfEps], &tscMgmtEpSet.port[tscMgmtEpSet.numOfEps]);
-    tscMgmtEpSet.numOfEps++;
+    taosGetFqdnPortFromEp(second, mgmtEpSet->fqdn[mgmtEpSet->numOfEps], &(mgmtEpSet->port[mgmtEpSet->numOfEps]));
+    mgmtEpSet->numOfEps++;
   }
 
-  if ( tscMgmtEpSet.numOfEps == 0) {
+  if (mgmtEpSet->numOfEps == 0) {
     terrno = TSDB_CODE_TSC_INVALID_FQDN;
     return -1;
   }
diff --git a/src/inc/trpc.h b/src/inc/trpc.h
index 1af6a5eb0f83cfefb949a6db91194ec8b002b944..bdee917b5e8203743a79ca27d8fbc987569c35ab 100644
--- a/src/inc/trpc.h
+++ b/src/inc/trpc.h
@@ -35,6 +35,11 @@ typedef struct SRpcEpSet {
   char      fqdn[TSDB_MAX_REPLICA][TSDB_FQDN_LEN];
 } SRpcEpSet;
 
+typedef struct SRpcCorEpSet {
+  int32_t version; 
+  SRpcEpSet epSet; 
+} SRpcCorEpSet;
+
 typedef struct SRpcConnInfo {
   uint32_t  clientIp;
   uint16_t  clientPort;
diff --git a/src/util/inc/tlockfree.h b/src/util/inc/tlockfree.h
index e425d71d270bd53a891e3585e12a2b762e8a81f6..a81f597832350c0d529670970d7eb80405321629 100644
--- a/src/util/inc/tlockfree.h
+++ b/src/util/inc/tlockfree.h
@@ -75,7 +75,7 @@ void taosRUnLockLatch(SRWLatch *pLatch);
 
 // copy on read
 #define taosCorBeginRead(x) for (uint32_t i_ = 1; 1; ++i_) { \
-    int32_t old_ = atomic_load_32(x); \
+    int32_t old_ = atomic_add_fetch_32((x), 0); \
     if (old_ & 0x00000001) { \
       if (i_ % 1000 == 0) { \
         sched_yield(); \
@@ -84,7 +84,7 @@ void taosRUnLockLatch(SRWLatch *pLatch);
     }
 
 #define taosCorEndRead(x) \
-    if (atomic_load_32(x) == old_) { \
+    if (atomic_add_fetch_32((x), 0) == old_) { \
       break; \
     } \
   }