diff --git a/src/client/src/tscServer.c b/src/client/src/tscServer.c
index 0785dd8b53392ee36e439c1a381479d1a09041d1..b5fa1ea15983d30c76125d5dba94ebbf2aa4d989 100644
--- a/src/client/src/tscServer.c
+++ b/src/client/src/tscServer.c
@@ -43,6 +43,14 @@ void tscUpdateSubscriptionProgress(void* sub, int64_t uid, TSKEY ts);
 void tscSaveSubscriptionProgress(void* sub);
 
 static int32_t minMsgSize() { return tsRpcHeadSize + 100; }
+static int32_t getWaitingTimeInterval(int32_t count) {
+  int32_t initial = 100; // 100 ms by default
+  if (count <= 1) {
+    return 0;
+  }
+
+  return initial * (2<<(count - 2));
+}
 
 static void tscSetDnodeEpSet(SSqlObj* pSql, SCMVgroupInfo* pVgroupInfo) {
   assert(pSql != NULL && pVgroupInfo != NULL && pVgroupInfo->numOfEps > 0);
@@ -275,6 +283,7 @@ void tscProcessMsgFromServer(SRpcMsg *rpcMsg, SRpcEpSet *pEpSet) {
       (rpcMsg->code == TSDB_CODE_TDB_INVALID_TABLE_ID ||
        rpcMsg->code == TSDB_CODE_VND_INVALID_VGROUP_ID ||
        rpcMsg->code == TSDB_CODE_RPC_NETWORK_UNAVAIL ||
+       rpcMsg->code == TSDB_CODE_APP_NOT_READY ||
        rpcMsg->code == TSDB_CODE_TDB_TABLE_RECONFIGURE)) {
     tscWarn("%p it shall renew table meta, code:%s, retry:%d", pSql, tstrerror(rpcMsg->code), ++pSql->retry);
 
@@ -287,6 +296,12 @@ void tscProcessMsgFromServer(SRpcMsg *rpcMsg, SRpcEpSet *pEpSet) {
     if (pSql->retry > pSql->maxRetry) {
       tscError("%p max retry %d reached, give up", pSql, pSql->maxRetry);
     } else {
+      // wait for a little bit moment and then retry
+      if (rpcMsg->code == TSDB_CODE_APP_NOT_READY || rpcMsg->code == TSDB_CODE_VND_INVALID_VGROUP_ID) {
+        int32_t duration = getWaitingTimeInterval(pSql->retry);
+        taosMsleep(duration);
+      }
+
       rpcMsg->code = tscRenewTableMeta(pSql, pTableMetaInfo->name);
 
       // if there is an error occurring, proceed to the following error handling procedure.
diff --git a/src/dnode/src/dnodeMgmt.c b/src/dnode/src/dnodeMgmt.c
index 4b06626753b73fc63487bf699280953115ed75a7..c1071f9698a4f136681f38a3c10132775219cf07 100644
--- a/src/dnode/src/dnodeMgmt.c
+++ b/src/dnode/src/dnodeMgmt.c
@@ -165,6 +165,13 @@ int32_t dnodeInitMgmtTimer() {
   return TSDB_CODE_SUCCESS;
 }
 
+void dnodeSendStatusMsgToMnode() {
+  if (tsDnodeTmr != NULL && tsStatusTimer != NULL) {
+    dInfo("force send status msg to mnode");
+    taosTmrReset(dnodeSendStatusMsg, 3, NULL, tsDnodeTmr, &tsStatusTimer);
+  }
+}
+
 void dnodeCleanupMgmtTimer() {
   if (tsStatusTimer != NULL) {
     taosTmrStopA(&tsStatusTimer);
diff --git a/src/dnode/src/dnodePeer.c b/src/dnode/src/dnodePeer.c
index b27f56a871bf4b0eecf841b625c6251810edbfce..c09d7422396b4525945ae0bb1f32d77d82ac9903 100644
--- a/src/dnode/src/dnodePeer.c
+++ b/src/dnode/src/dnodePeer.c
@@ -93,7 +93,7 @@ static void dnodeProcessReqMsgFromDnode(SRpcMsg *pMsg, SRpcEpSet *pEpSet) {
   if (pMsg->pCont == NULL) return;
 
   if (dnodeGetRunStatus() != TSDB_DNODE_RUN_STATUS_RUNING) {
-    rspMsg.code = TSDB_CODE_RPC_NOT_READY;
+    rspMsg.code = TSDB_CODE_APP_NOT_READY;
     rpcSendResponse(&rspMsg);
     rpcFreeCont(pMsg->pCont);
     dDebug("RPC %p, msg:%s is ignored since dnode not running", pMsg->handle, taosMsg[pMsg->msgType]);
diff --git a/src/dnode/src/dnodeShell.c b/src/dnode/src/dnodeShell.c
index f9d137bb99505047ed23fee5a58b57a014789e7f..5daf61670655486ec629fb715d2b33ed6f32d4f2 100644
--- a/src/dnode/src/dnodeShell.c
+++ b/src/dnode/src/dnodeShell.c
@@ -119,7 +119,7 @@ void dnodeProcessMsgFromShell(SRpcMsg *pMsg, SRpcEpSet *pEpSet) {
 
   if (dnodeGetRunStatus() != TSDB_DNODE_RUN_STATUS_RUNING) {
     dError("RPC %p, shell msg:%s is ignored since dnode not running", pMsg->handle, taosMsg[pMsg->msgType]);
-    rpcMsg.code = TSDB_CODE_RPC_NOT_READY;
+    rpcMsg.code = TSDB_CODE_APP_NOT_READY;
     rpcSendResponse(&rpcMsg);
     rpcFreeCont(pMsg->pCont);
     return;
@@ -144,7 +144,7 @@ void dnodeProcessMsgFromShell(SRpcMsg *pMsg, SRpcEpSet *pEpSet) {
 
 static int dnodeRetrieveUserAuthInfo(char *user, char *spi, char *encrypt, char *secret, char *ckey) {
   int code = mnodeRetriveAuth(user, spi, encrypt, secret, ckey);
-  if (code != TSDB_CODE_RPC_NOT_READY) return code;
+  if (code != TSDB_CODE_APP_NOT_READY) return code;
 
   SDMAuthMsg *pMsg = rpcMallocCont(sizeof(SDMAuthMsg));
   tstrncpy(pMsg->user, user, sizeof(pMsg->user));
diff --git a/src/inc/dnode.h b/src/inc/dnode.h
index 5a059c93a627b9c57085db4ad30058393f8791b0..093ce93205646313a5f0ca3bec4d121ad8e20776 100644
--- a/src/inc/dnode.h
+++ b/src/inc/dnode.h
@@ -65,6 +65,8 @@ void    dnodeSendRpcMnodeWriteRsp(void *pMsg, int32_t code);
 void    dnodeReprocessMnodeWriteMsg(void *pMsg);
 void    dnodeDelayReprocessMnodeWriteMsg(void *pMsg);
 
+void    dnodeSendStatusMsgToMnode();
+
 #ifdef __cplusplus
 }
 #endif
diff --git a/src/inc/taoserror.h b/src/inc/taoserror.h
index 9af4cee28ae2eb11ab24e987cecbf787e7e8fe50..57c2b322faee5f56a5b8e1f1fe38a597a63a0b9e 100644
--- a/src/inc/taoserror.h
+++ b/src/inc/taoserror.h
@@ -65,6 +65,7 @@ TAOS_DEFINE_ERROR(TSDB_CODE_RPC_INVALID_SESSION_ID,       0, 0x0010, "Invalid se
 TAOS_DEFINE_ERROR(TSDB_CODE_RPC_INVALID_MSG_TYPE,         0, 0x0011, "Invalid message type")
 TAOS_DEFINE_ERROR(TSDB_CODE_RPC_INVALID_RESPONSE_TYPE,    0, 0x0012, "Invalid response type")
 TAOS_DEFINE_ERROR(TSDB_CODE_RPC_INVALID_TIME_STAMP,       0, 0x0013, "Invalid timestamp")
+TAOS_DEFINE_ERROR(TSDB_CODE_APP_NOT_READY,                0, 0x0014, "Database not ready")
 
 //common & util
 TAOS_DEFINE_ERROR(TSDB_CODE_COM_OPS_NOT_SUPPORT,          0, 0x0100, "Operation not supported")
@@ -184,7 +185,6 @@ TAOS_DEFINE_ERROR(TSDB_CODE_VND_NO_DISK_PERMISSIONS,      0, 0x0506, "No write p
 TAOS_DEFINE_ERROR(TSDB_CODE_VND_NO_SUCH_FILE_OR_DIR,      0, 0x0507, "Missing data file")
 TAOS_DEFINE_ERROR(TSDB_CODE_VND_OUT_OF_MEMORY,            0, 0x0508, "Out of memory")
 TAOS_DEFINE_ERROR(TSDB_CODE_VND_APP_ERROR,                0, 0x0509, "Unexpected generic error in vnode")
-TAOS_DEFINE_ERROR(TSDB_CODE_VND_INVALID_STATUS,           0, 0x0510, "Database not ready")
 TAOS_DEFINE_ERROR(TSDB_CODE_VND_NOT_SYNCED,               0, 0x0511, "Database suspended")
 TAOS_DEFINE_ERROR(TSDB_CODE_VND_NO_WRITE_AUTH,            0, 0x0512, "Write operation denied")
 
diff --git a/src/mnode/src/mnodeUser.c b/src/mnode/src/mnodeUser.c
index 6e63a8f2de5f6d8af5d1fe295f4ae9fa774a0395..f4cb1a9ef3d435cd044df03fd96835043b73ff71 100644
--- a/src/mnode/src/mnodeUser.c
+++ b/src/mnode/src/mnodeUser.c
@@ -581,8 +581,8 @@ void mnodeDropAllUsers(SAcctObj *pAcct)  {
 int32_t mnodeRetriveAuth(char *user, char *spi, char *encrypt, char *secret, char *ckey) {
   if (!sdbIsMaster()) {
     *secret = 0;
-    mDebug("user:%s, failed to auth user, reason:%s", user, tstrerror(TSDB_CODE_RPC_NOT_READY));
-    return TSDB_CODE_RPC_NOT_READY;
+    mDebug("user:%s, failed to auth user, reason:%s", user, tstrerror(TSDB_CODE_APP_NOT_READY));
+    return TSDB_CODE_APP_NOT_READY;
   }
 
   SUserObj *pUser = mnodeGetUser(user);
diff --git a/src/rpc/src/rpcMain.c b/src/rpc/src/rpcMain.c
index d0c57a34d0551639c3f689d39f34e38ff88836b1..777e4f824040f675d026f0785217f2b47f669105 100644
--- a/src/rpc/src/rpcMain.c
+++ b/src/rpc/src/rpcMain.c
@@ -1120,7 +1120,7 @@ static void rpcProcessIncomingMsg(SRpcConn *pConn, SRpcHead *pHead) {
         pContext->epSet.port[i] = htons(pContext->epSet.port[i]);
       rpcSendReqToServer(pRpc, pContext);
       rpcFreeCont(rpcMsg.pCont);
-    } else if (pHead->code == TSDB_CODE_RPC_NOT_READY) {
+    } else if (pHead->code == TSDB_CODE_RPC_NOT_READY || pHead->code == TSDB_CODE_APP_NOT_READY) {
       pContext->code = pHead->code;
       rpcProcessConnError(pContext, NULL);
       rpcFreeCont(rpcMsg.pCont);
diff --git a/src/vnode/src/vnodeMain.c b/src/vnode/src/vnodeMain.c
index 0a5e292f6de359fea2ca22825a95cfb058302023..e5536bfaafd44c5e043c45bcdb1c3840e06e86ab 100644
--- a/src/vnode/src/vnodeMain.c
+++ b/src/vnode/src/vnodeMain.c
@@ -30,6 +30,7 @@
 #include "vnode.h"
 #include "vnodeInt.h"
 #include "query.h"
+#include "dnode.h"
 
 #define TSDB_VNODE_VERSION_CONTENT_LEN 31
 
@@ -361,6 +362,7 @@ void vnodeRelease(void *pVnodeRaw) {
     sprintf(rootDir, "%s/vnode%d", tsVnodeDir, vgId);
     taosMvDir(tsVnodeBakDir, rootDir);
     taosRemoveDir(rootDir);
+    dnodeSendStatusMsgToMnode();
   }
 
   tsem_destroy(&pVnode->sem);
@@ -390,7 +392,7 @@ void *vnodeAcquireRqueue(int32_t vgId) {
   if (pVnode == NULL) return NULL;
 
   if (pVnode->status == TAOS_VN_STATUS_RESET) {           
-    terrno = TSDB_CODE_VND_INVALID_STATUS;
+    terrno = TSDB_CODE_APP_NOT_READY;
     vInfo("vgId:%d, status is in reset", vgId);
     vnodeRelease(pVnode);
     return NULL;
@@ -404,7 +406,7 @@ void *vnodeAcquireWqueue(int32_t vgId) {
   if (pVnode == NULL) return NULL;
 
   if (pVnode->status == TAOS_VN_STATUS_RESET) {           
-    terrno = TSDB_CODE_VND_INVALID_STATUS;
+    terrno = TSDB_CODE_APP_NOT_READY;
     vInfo("vgId:%d, status is in reset", vgId);
     vnodeRelease(pVnode);
     return NULL;
@@ -547,6 +549,7 @@ static void vnodeNotifyRole(void *ahandle, int8_t role) {
   SVnodeObj *pVnode = ahandle;
   vInfo("vgId:%d, sync role changed from %d to %d", pVnode->vgId, pVnode->role, role);
   pVnode->role = role;
+  dnodeSendStatusMsgToMnode();
 
   if (pVnode->role == TAOS_SYNC_ROLE_MASTER)
     cqStart(pVnode->cq);
diff --git a/src/vnode/src/vnodeRead.c b/src/vnode/src/vnodeRead.c
index c41b24579469d93f6864727a919327f782f87dbb..11315f5321f674fa11faeef98d28a1776f42468c 100644
--- a/src/vnode/src/vnodeRead.c
+++ b/src/vnode/src/vnodeRead.c
@@ -49,18 +49,18 @@ int32_t vnodeProcessRead(void *param, SReadMsg *pReadMsg) {
 
   if (pVnode->status != TAOS_VN_STATUS_READY) {
     vDebug("vgId:%d, msgType:%s not processed, vnode status is %d", pVnode->vgId, taosMsg[msgType], pVnode->status);
-    return TSDB_CODE_VND_INVALID_STATUS; 
+    return TSDB_CODE_APP_NOT_READY; 
   }
 
   // tsdb may be in reset state  
-  if (pVnode->tsdb == NULL) return TSDB_CODE_RPC_NOT_READY;
+  if (pVnode->tsdb == NULL) return TSDB_CODE_APP_NOT_READY;
   if (pVnode->status == TAOS_VN_STATUS_CLOSING)
-    return TSDB_CODE_RPC_NOT_READY;
+    return TSDB_CODE_APP_NOT_READY;
 
   // TODO: Later, let slave to support query
   if (pVnode->syncCfg.replica > 1 && pVnode->role != TAOS_SYNC_ROLE_MASTER) {
     vDebug("vgId:%d, msgType:%s not processed, replica:%d role:%d", pVnode->vgId, taosMsg[msgType], pVnode->syncCfg.replica, pVnode->role);
-    return TSDB_CODE_RPC_NOT_READY;
+    return TSDB_CODE_APP_NOT_READY;
   }
 
   return (*vnodeProcessReadMsgFp[msgType])(pVnode, pReadMsg);
diff --git a/src/vnode/src/vnodeWrite.c b/src/vnode/src/vnodeWrite.c
index 900ff1fbbacc034b20bc0a04df5758e595bb3f32..1a9b05ed34eb787ba6594c99f2fdf7c3f3b81945 100644
--- a/src/vnode/src/vnodeWrite.c
+++ b/src/vnode/src/vnodeWrite.c
@@ -60,19 +60,19 @@ int32_t vnodeProcessWrite(void *param1, int qtype, void *param2, void *item) {
   }
 
   // tsdb may be in reset state 
-  if (pVnode->tsdb == NULL) return TSDB_CODE_RPC_NOT_READY;
+  if (pVnode->tsdb == NULL) return TSDB_CODE_APP_NOT_READY;
   if (pVnode->status == TAOS_VN_STATUS_CLOSING) 
-    return TSDB_CODE_RPC_NOT_READY;
+    return TSDB_CODE_APP_NOT_READY;
   
   if (pHead->version == 0) { // from client or CQ 
     if (pVnode->status != TAOS_VN_STATUS_READY) {
       vDebug("vgId:%d, msgType:%s not processed, vnode status is %d", pVnode->vgId, taosMsg[pHead->msgType], pVnode->status);
-      return TSDB_CODE_VND_INVALID_STATUS;  // it may be in deleting or closing state
+      return TSDB_CODE_APP_NOT_READY;  // it may be in deleting or closing state
     }
 
     if (pVnode->role != TAOS_SYNC_ROLE_MASTER) {
       vDebug("vgId:%d, msgType:%s not processed, replica:%d role:%d", pVnode->vgId, taosMsg[pHead->msgType], pVnode->syncCfg.replica, pVnode->role);
-      return TSDB_CODE_RPC_NOT_READY;
+      return TSDB_CODE_APP_NOT_READY;
     }
 
     // assign version