diff --git a/src/client/src/tscServer.c b/src/client/src/tscServer.c
index 111ebc4e8c..8b896fb90e 100644
--- a/src/client/src/tscServer.c
+++ b/src/client/src/tscServer.c
@@ -1065,7 +1065,7 @@ int32_t tscBuildDropDnodeMsg(SSqlObj *pSql, SSqlInfo *pInfo) {
   return TSDB_CODE_SUCCESS;
 }
 
-int32_t tscBuildDropAcctMsg(SSqlObj *pSql, SSqlInfo *pInfo) {
+int32_t tscBuildDropUserMsg(SSqlObj *pSql, SSqlInfo *pInfo) {
   SSqlCmd *pCmd = &pSql->cmd;
   pCmd->payloadLen = sizeof(SCMDropUserMsg);
   pCmd->msgType = TSDB_MSG_TYPE_CM_DROP_USER;
@@ -1082,6 +1082,23 @@ int32_t tscBuildDropAcctMsg(SSqlObj *pSql, SSqlInfo *pInfo) {
   return TSDB_CODE_SUCCESS;
 }
 
+int32_t tscBuildDropAcctMsg(SSqlObj *pSql, SSqlInfo *pInfo) {
+  SSqlCmd *pCmd = &pSql->cmd;
+  pCmd->payloadLen = sizeof(SCMDropUserMsg);
+  pCmd->msgType = TSDB_MSG_TYPE_CM_DROP_ACCT;
+
+  if (TSDB_CODE_SUCCESS != tscAllocPayload(pCmd, pCmd->payloadLen)) {
+    tscError("%p failed to malloc for query msg", pSql);
+    return TSDB_CODE_CLI_OUT_OF_MEMORY;
+  }
+
+  SCMDropUserMsg *pDropMsg = (SCMDropUserMsg*)pCmd->payload;
+  STableMetaInfo *pTableMetaInfo = tscGetTableMetaInfoFromCmd(pCmd, pCmd->clauseIndex, 0);
+  strcpy(pDropMsg->user, pTableMetaInfo->name);
+
+  return TSDB_CODE_SUCCESS;
+}
+
 int32_t tscBuildUseDbMsg(SSqlObj *pSql, SSqlInfo *pInfo) {
   SSqlCmd *pCmd = &pSql->cmd;
   pCmd->payloadLen = sizeof(SCMUseDbMsg);
@@ -2550,7 +2567,7 @@ void tscInitMsgsFp() {
   tscBuildMsg[TSDB_SQL_ALTER_ACCT] = tscBuildAcctMsg;
 
   tscBuildMsg[TSDB_SQL_CREATE_TABLE] = tscBuildCreateTableMsg;
-  tscBuildMsg[TSDB_SQL_DROP_USER] = tscBuildDropAcctMsg;
+  tscBuildMsg[TSDB_SQL_DROP_USER] = tscBuildDropUserMsg;
   tscBuildMsg[TSDB_SQL_DROP_ACCT] = tscBuildDropAcctMsg;
   tscBuildMsg[TSDB_SQL_DROP_DB] = tscBuildDropDbMsg;
   tscBuildMsg[TSDB_SQL_DROP_TABLE] = tscBuildDropTableMsg;
diff --git a/src/dnode/src/dnodeMgmt.c b/src/dnode/src/dnodeMgmt.c
index 4d335d7353..1ffcf94ccd 100644
--- a/src/dnode/src/dnodeMgmt.c
+++ b/src/dnode/src/dnodeMgmt.c
@@ -30,24 +30,24 @@
 #include "dnodeWrite.h"
 
 typedef struct {
-  int32_t vgId;     // global vnode group ID
-  int32_t refCount; // reference count
-  int8_t  dirty;
-  int8_t  status;   // status: master, slave, notready, deleting
-  int64_t version;
-  void   *wworker;
-  void   *rworker;
-  void   *wal;
-  void   *tsdb;
-  void   *replica;
-  void   *events;
-  void   *cq;      // continuous query
+  int32_t      vgId;      // global vnode group ID
+  int32_t      refCount;  // reference count
+  EVnodeStatus status;    // status: master, slave, notready, deleting
+  int64_t      version;
+  void *       wworker;
+  void *       rworker;
+  void *       wal;
+  void *       tsdb;
+  void *       replica;
+  void *       events;
+  void *       cq;  // continuous query
 } SVnodeObj;
 
 static int32_t  dnodeOpenVnodes();
 static void     dnodeCleanupVnodes();
 static int32_t  dnodeOpenVnode(int32_t vnode, char *rootDir);
 static void     dnodeCleanupVnode(SVnodeObj *pVnode);
+static void     dnodeDoCleanupVnode(SVnodeObj *pVnode);
 static int32_t  dnodeCreateVnode(SMDCreateVnodeMsg *cfg);
 static void     dnodeDropVnode(SVnodeObj *pVnode);
 static void     dnodeDoDropVnode(SVnodeObj *pVnode);
@@ -89,9 +89,14 @@ int32_t dnodeInitMgmt() {
     dError("failed to init dnode timer");
     return -1;
   }
-  taosTmrReset(dnodeSendStatusMsg, 500, NULL, tsDnodeTmr, &tsStatusTimer);
+  
+  int32_t code = dnodeOpenVnodes();
+  if (code != TSDB_CODE_SUCCESS) {
+    return -1;
+  }
 
-  return dnodeOpenVnodes();
+  taosTmrReset(dnodeSendStatusMsg, 500, NULL, tsDnodeTmr, &tsStatusTimer);
+  return TSDB_CODE_SUCCESS;
 }
 
 void dnodeCleanupMgmt() {
@@ -141,6 +146,8 @@ void *dnodeGetVnode(int32_t vgId) {
   }
 
   atomic_add_fetch_32(&pVnode->refCount, 1);
+  dTrace("pVnode:%p, vgroup:%d, get vnode, refCount:%d", pVnode, pVnode->vgId, pVnode->refCount);
+
   return pVnode;
 }
 
@@ -166,10 +173,24 @@ void *dnodeGetVnodeTsdb(void *pVnode) {
 
 void dnodeReleaseVnode(void *pVnodeRaw) {
   SVnodeObj *pVnode = pVnodeRaw;
-  int32_t count = atomic_sub_fetch_32(&pVnode->refCount, 1);
 
-  if (count == 0 && pVnode->dirty) {
-    dnodeDoDropVnode(pVnode);
+  int32_t refCount = atomic_sub_fetch_32(&pVnode->refCount, 1);
+  if (pVnode->status == TSDB_VN_STATUS_DELETING) {
+    if (refCount <= 0) {
+      dPrint("pVnode:%p, vgroup:%d, drop vnode, refCount:%d", pVnode, pVnode->vgId, refCount);
+      dnodeDoDropVnode(pVnode);
+    } else {
+      dTrace("pVnode:%p, vgroup:%d, vnode will be dropped until refCount:%d is 0", pVnode, pVnode->vgId, refCount);
+    }
+  } else if (pVnode->status == TSDB_VN_STATUS_CLOSING) {
+    if (refCount <= 0) {
+      dPrint("pVnode:%p, vgroup:%d, cleanup vnode, refCount:%d", pVnode, pVnode->vgId, refCount);
+      dnodeDoCleanupVnode(pVnode);
+    } else {
+      dTrace("pVnode:%p, vgroup:%d, vnode will cleanup until refCount:%d is 0", pVnode, pVnode->vgId, refCount);
+    }
+  } else {
+    dTrace("pVnode:%p, vgroup:%d, release vnode, refCount:%d", pVnode, pVnode->vgId, refCount);
   }
 }
 
@@ -210,42 +231,42 @@ static void dnodeCleanupVnodes() {
 }
 
 static int32_t dnodeOpenVnode(int32_t vnode, char *rootDir) {
+  SVnodeObj vnodeObj = {0};
+  vnodeObj.vgId     = vnode;
+  vnodeObj.status   = TSDB_VN_STATUS_NOT_READY;
+  vnodeObj.refCount = 1;
+  vnodeObj.version  = 0;  
+  SVnodeObj *pVnode = (SVnodeObj *)taosAddIntHash(tsDnodeVnodesHash, vnodeObj.vgId, (char *)(&vnodeObj));
+
   char tsdbDir[TSDB_FILENAME_LEN];
   sprintf(tsdbDir, "%s/tsdb", rootDir);
   void *pTsdb = tsdbOpenRepo(tsdbDir);
   if (pTsdb == NULL) {
-    dError("failed to open tsdb in vnode:%d %s, reason:%s", vnode, tsdbDir, tstrerror(terrno));
+    dError("pVnode:%p, vgroup:%d, failed to open tsdb in %s, reason:%s", pVnode, pVnode->vgId, tsdbDir, tstrerror(terrno));
+    taosDeleteIntHash(tsDnodeVnodesHash, pVnode->vgId);
     return terrno;
   }
 
-  //STsdbRepoInfo *tsdbInfo = tsdbGetStatus(pTsdb);
-
-  SVnodeObj vnodeObj = {0};
-  vnodeObj.vgId     = vnode;//tsdbInfo->tsdbCfg.tsdbId;
-  vnodeObj.status   = TSDB_VN_STATUS_NOT_READY;
-  vnodeObj.refCount = 1;
-  vnodeObj.version  = 0;
-  vnodeObj.wal      = NULL;
-  vnodeObj.tsdb     = pTsdb;
-  vnodeObj.replica  = NULL;
-  vnodeObj.events   = NULL;
-  vnodeObj.cq       = NULL;
-
-  SVnodeObj *pVnode = (SVnodeObj *)taosAddIntHash(tsDnodeVnodesHash, vnodeObj.vgId, (char *)(&vnodeObj));
+  pVnode->wal      = NULL;
+  pVnode->tsdb     = pTsdb;
+  pVnode->replica  = NULL;
+  pVnode->events   = NULL;
+  pVnode->cq       = NULL;
   pVnode->wworker = dnodeAllocateWriteWorker(pVnode);
   pVnode->rworker = dnodeAllocateReadWorker(pVnode);
 
-  dTrace("open vnode:%d in %s", pVnode->vgId, rootDir);
+  //TODO: jude status while replca is not null
+  if (pVnode->replica == NULL) {
+    pVnode->status = TSDB_VN_STATUS_MASTER;
+  }
+
+  dTrace("pVnode:%p, vgroup:%d, vnode is opened in %s", pVnode, pVnode->vgId, rootDir);
   return TSDB_CODE_SUCCESS;
 }
 
-static void dnodeCleanupVnode(SVnodeObj *pVnode) {
-  pVnode->status = TSDB_VN_STATUS_NOT_READY;
-  int32_t count = atomic_sub_fetch_32(&pVnode->refCount, 1);
-  if (count > 0) {
-    // wait refcount
-  }
-
+static void dnodeDoCleanupVnode(SVnodeObj *pVnode) {
+  dTrace("pVnode:%p, vgroup:%d, cleanup vnode", pVnode, pVnode->vgId);
+  
   // remove replica
 
   // remove read queue
@@ -263,8 +284,11 @@ static void dnodeCleanupVnode(SVnodeObj *pVnode) {
     tsdbCloseRepo(pVnode->tsdb);
     pVnode->tsdb = NULL;
   }
+}
 
-  dTrace("cleanup vnode:%d", pVnode->vgId);
+static void dnodeCleanupVnode(SVnodeObj *pVnode) {
+  pVnode->status = TSDB_VN_STATUS_CLOSING;
+  dnodeReleaseVnode(pVnode);
 }
 
 static int32_t dnodeCreateVnode(SMDCreateVnodeMsg *pVnodeCfg) {
@@ -311,7 +335,7 @@ static int32_t dnodeCreateVnode(SMDCreateVnodeMsg *pVnodeCfg) {
 
   SVnodeObj vnodeObj = {0};
   vnodeObj.vgId     = pVnodeCfg->cfg.vgId;
-  vnodeObj.status   = TSDB_VN_STATUS_NOT_READY;
+  vnodeObj.status   = TSDB_VN_STATUS_CREATING;
   vnodeObj.refCount = 1;
   vnodeObj.version  = 0;
   vnodeObj.wal      = NULL;
@@ -323,32 +347,27 @@ static int32_t dnodeCreateVnode(SMDCreateVnodeMsg *pVnodeCfg) {
   SVnodeObj *pVnode = (SVnodeObj *)taosAddIntHash(tsDnodeVnodesHash, vnodeObj.vgId, (char *)(&vnodeObj));
   pVnode->wworker = dnodeAllocateWriteWorker(pVnode);
   pVnode->rworker = dnodeAllocateReadWorker(pVnode);
+  if (pVnode->replica == NULL) {
+    pVnode->status = TSDB_VN_STATUS_MASTER;
+  }
 
   dPrint("vgroup:%d, vnode:%d is created", pVnode->vgId, pVnode->vgId);
   return TSDB_CODE_SUCCESS;
 }
 
 static void dnodeDoDropVnode(SVnodeObj *pVnode) {
-  if (pVnode->tsdb) {
-    tsdbDropRepo(pVnode->tsdb);
-    pVnode->tsdb = NULL;
-  }
-
-  dnodeCleanupVnode(pVnode);
+  dnodeDoCleanupVnode(pVnode);
   taosDeleteIntHash(tsDnodeVnodesHash, pVnode->vgId);
+
+  char rootDir[TSDB_FILENAME_LEN] = {0};
+  sprintf(rootDir, "%s/vnode%d", tsVnodeDir, pVnode->vgId);
+  dPrint("pVnode:%p, vgroup:%d, drop file:%s from disk", pVnode, pVnode->vgId, rootDir);
+  // rmdir(rootDir);
 }
 
 static void dnodeDropVnode(SVnodeObj *pVnode) {
-  pVnode->status = TSDB_VN_STATUS_NOT_READY;
-  pVnode->dirty  = true;
-
-  int32_t count = atomic_sub_fetch_32(&pVnode->refCount, 1);
-  if (count > 0) {
-    dTrace("vgroup:%d, vnode will be dropped until refcount:%d is 0", pVnode->vgId, count);
-    return;
-  }
-
-  dnodeDoDropVnode(pVnode);
+  pVnode->status = TSDB_VN_STATUS_DELETING;
+  dnodeReleaseVnode(pVnode);
 }
 
 static void dnodeProcessCreateVnodeMsg(SRpcMsg *rpcMsg) {
@@ -359,7 +378,7 @@ static void dnodeProcessCreateVnodeMsg(SRpcMsg *rpcMsg) {
   pCreate->cfg.maxSessions = htonl(pCreate->cfg.maxSessions);
   pCreate->cfg.daysPerFile = htonl(pCreate->cfg.daysPerFile);
 
-  dTrace("vgroup:%d, start to create vnode:%d in dnode", pCreate->cfg.vgId, pCreate->cfg.vgId);
+  dTrace("vgroup:%d, start to create vnode in dnode", pCreate->cfg.vgId);
 
   SVnodeObj *pVnodeObj = (SVnodeObj *) taosGetIntHashData(tsDnodeVnodesHash, pCreate->cfg.vgId);
   if (pVnodeObj != NULL) {
@@ -378,13 +397,13 @@ static void dnodeProcessDropVnodeMsg(SRpcMsg *rpcMsg) {
   SMDDropVnodeMsg *pDrop = rpcMsg->pCont;
   pDrop->vgId = htonl(pDrop->vgId);
 
-  dTrace("vgroup:%d, start to drop vnode in dnode", pDrop->vgId);
-
   SVnodeObj *pVnodeObj = (SVnodeObj *) taosGetIntHashData(tsDnodeVnodesHash, pDrop->vgId);
   if (pVnodeObj != NULL) {
+    dPrint("pVnode:%p, vgroup:%d, start to drop vnode in dnode", pVnodeObj, pDrop->vgId);
     dnodeDropVnode(pVnodeObj);
     rpcRsp.code = TSDB_CODE_SUCCESS;
   } else {
+    dTrace("vgroup:%d, failed drop vnode in dnode, vgroup not exist", pDrop->vgId);
     rpcRsp.code = TSDB_CODE_INVALID_VGROUP_ID;
   }
 
@@ -403,8 +422,10 @@ static void dnodeProcessAlterVnodeMsg(SRpcMsg *rpcMsg) {
 
   SVnodeObj *pVnodeObj = (SVnodeObj *) taosGetIntHashData(tsDnodeVnodesHash, pCreate->cfg.vgId);
   if (pVnodeObj != NULL) {
+    dPrint("pVnode:%p, vgroup:%d, start to alter vnode in dnode", pVnodeObj, pCreate->cfg.vgId);
     rpcRsp.code = TSDB_CODE_SUCCESS;
   } else {
+    dTrace("vgroup:%d, alter vnode msg received, start to create vnode", pCreate->cfg.vgId);
     rpcRsp.code = dnodeCreateVnode(pCreate);;
   }
 
@@ -432,7 +453,8 @@ static void dnodeProcessConfigDnodeMsg(SRpcMsg *pMsg) {
 
 static void dnodeBuildVloadMsg(char *pNode, void * param) {
   SVnodeObj *pVnode = (SVnodeObj *) pNode;
-  if (pVnode->dirty) return;
+  dPrint("===> pVnode:%p, vgroup:%d status:%s", pVnode, pVnode->vgId, taosGetVnodeStatusStr(pVnode->status));
+  if (pVnode->status == TSDB_VN_STATUS_DELETING) return;
   
   SDMStatusMsg *pStatus = param;
   if (pStatus->openVnodes >= TSDB_MAX_VNODES) return;
@@ -528,4 +550,3 @@ void dnodeUpdateDnodeId(int32_t dnodeId) {
     dnodeSaveDnodeId();
   }
 }
-
diff --git a/src/dnode/src/dnodeMnode.c b/src/dnode/src/dnodeMnode.c
index 9d1be0148e..c19a63c0e7 100644
--- a/src/dnode/src/dnodeMnode.c
+++ b/src/dnode/src/dnodeMnode.c
@@ -79,6 +79,12 @@ static void dnodeProcessMsgFromMnode(SRpcMsg *pMsg) {
     return;
   }
 
+  if (pMsg->pCont == NULL) {
+    rspMsg.code = TSDB_CODE_INVALID_MSG_LEN;
+    rpcSendResponse(&rspMsg);
+    return;
+  }
+
   if (dnodeProcessMgmtMsgFp[pMsg->msgType]) {
     (*dnodeProcessMgmtMsgFp[pMsg->msgType])(pMsg);
   } else {
diff --git a/src/mnode/src/mgmtDServer.c b/src/mnode/src/mgmtDServer.c
index b1d01b91f1..ca23a3cfca 100644
--- a/src/mnode/src/mgmtDServer.c
+++ b/src/mnode/src/mgmtDServer.c
@@ -32,11 +32,11 @@
 #include "mgmtTable.h"
 #include "mgmtVgroup.h"
 
-
 static void   mgmtProcessMsgFromDnode(SRpcMsg *rpcMsg);
 static int    mgmtDServerRetrieveAuth(char *user, char *spi, char *encrypt, char *secret, char *ckey);
 static void (*mgmtProcessDnodeMsgFp[TSDB_MSG_TYPE_MAX])(SRpcMsg *rpcMsg);
 static void  *tsMgmtDServerRpc;
+static void  *tsMgmtDServerQhandle = NULL;
 
 int32_t mgmtInitDServer() {
   SRpcInit rpcInit = {0};
@@ -56,11 +56,18 @@ int32_t mgmtInitDServer() {
     return -1;
   }
 
+  tsMgmtDServerQhandle = taosInitScheduler(tsMaxShellConns, 1, "MS");
+
   mPrint("server connection to dnode is opened");
   return 0;
 }
 
 void mgmtCleanupDServer() {
+  if (tsMgmtDServerQhandle) {
+    taosCleanUpScheduler(tsMgmtDServerQhandle);
+    tsMgmtDServerQhandle = NULL;
+  }
+
   if (tsMgmtDServerRpc) {
     rpcClose(tsMgmtDServerRpc);
     tsMgmtDServerRpc = NULL;
@@ -72,14 +79,34 @@ void mgmtAddDServerMsgHandle(uint8_t msgType, void (*fp)(SRpcMsg *rpcMsg)) {
   mgmtProcessDnodeMsgFp[msgType] = fp;
 }
 
+static void mgmtProcessDServerRequest(SSchedMsg *sched) {
+  SRpcMsg *pMsg = sched->msg;
+  (*mgmtProcessDnodeMsgFp[pMsg->msgType])(pMsg);
+  rpcFreeCont(pMsg->pCont);
+  free(pMsg);
+}
+
+static void mgmtAddToDServerQueue(SRpcMsg *pMsg) {
+  SSchedMsg schedMsg;
+  schedMsg.msg = pMsg;
+  schedMsg.fp  = mgmtProcessDServerRequest;
+  taosScheduleTask(tsMgmtDServerQhandle, &schedMsg);
+}
+
 static void mgmtProcessMsgFromDnode(SRpcMsg *rpcMsg) {
+  if (rpcMsg->pCont == NULL) {
+    mgmtSendSimpleResp(rpcMsg->handle, TSDB_CODE_INVALID_MSG_LEN);
+    return;
+  }
+  
   if (mgmtProcessDnodeMsgFp[rpcMsg->msgType]) {
-    (*mgmtProcessDnodeMsgFp[rpcMsg->msgType])(rpcMsg);
+    SRpcMsg *pMsg = malloc(sizeof(SRpcMsg));
+    memcpy(pMsg, rpcMsg, sizeof(SRpcMsg));
+    mgmtAddToDServerQueue(pMsg);
   } else {
     mError("%s is not processed in dserver", taosMsg[rpcMsg->msgType]);
+    rpcFreeCont(rpcMsg->pCont);
   }
-
-  rpcFreeCont(rpcMsg->pCont);
 }
 
 static int mgmtDServerRetrieveAuth(char *user, char *spi, char *encrypt, char *secret, char *ckey) {
diff --git a/src/mnode/src/mgmtDb.c b/src/mnode/src/mgmtDb.c
index 41e7a70276..5f28c30423 100644
--- a/src/mnode/src/mgmtDb.c
+++ b/src/mnode/src/mgmtDb.c
@@ -903,9 +903,10 @@ static void mgmtProcessDropDbMsg(SQueuedMsg *pMsg) {
 void  mgmtDropAllDbs(SAcctObj *pAcct)  {
   int32_t numOfDbs = 0;
   SDbObj *pDb = NULL;
+  void *pNode = NULL;
 
   while (1) {
-    void *pNode = sdbFetchRow(tsDbSdb, pNode, (void **)&pDb);
+    pNode = sdbFetchRow(tsDbSdb, pNode, (void **)&pDb);
     if (pDb == NULL) break;
 
     if (pDb->pAcct == pAcct) {
@@ -914,5 +915,5 @@ void  mgmtDropAllDbs(SAcctObj *pAcct)  {
     }
   }
 
-  mTrace("acct:%s, all dbs is is set dirty", pAcct->acctId, numOfDbs);
+  mTrace("acct:%s, all dbs is is set dirty", pAcct->user, numOfDbs);
 }
\ No newline at end of file
diff --git a/src/mnode/src/mgmtDnode.c b/src/mnode/src/mgmtDnode.c
index fbe9738a13..0cabaa8135 100644
--- a/src/mnode/src/mgmtDnode.c
+++ b/src/mnode/src/mgmtDnode.c
@@ -144,19 +144,24 @@ void mgmtProcessDnodeStatusMsg(SRpcMsg *rpcMsg) {
 
   SDMStatusMsg *pStatus = rpcMsg->pCont;
   pStatus->dnodeId = htonl(pStatus->dnodeId);
+  pStatus->privateIp = htonl(pStatus->privateIp);
+  pStatus->publicIp = htonl(pStatus->publicIp);
+  pStatus->lastReboot = htonl(pStatus->lastReboot);
+  pStatus->numOfCores = htons(pStatus->numOfCores);
+  pStatus->numOfTotalVnodes = htons(pStatus->numOfTotalVnodes);
 
   SDnodeObj *pDnode = NULL;
   if (pStatus->dnodeId == 0) {
-    pDnode = mgmtGetDnodeByIp(htonl(pStatus->privateIp));
+    pDnode = mgmtGetDnodeByIp(pStatus->privateIp);
     if (pDnode == NULL) {
-      mTrace("dnode not created, privateIp:%s", taosIpStr(htonl(pStatus->privateIp)));
+      mTrace("dnode not created, privateIp:%s", taosIpStr(pStatus->privateIp));
       mgmtSendSimpleResp(rpcMsg->handle, TSDB_CODE_DNODE_NOT_EXIST);
       return;
     }
   } else {
     pDnode = mgmtGetDnode(pStatus->dnodeId);
     if (pDnode == NULL) {
-      mError("dnode:%d, not exist, privateIp:%s", taosIpStr(pStatus->dnodeId), pStatus->dnodeName);
+      mError("dnode:%d, not exist, privateIp:%s", pStatus->dnodeId, taosIpStr(pStatus->privateIp));
       mgmtSendSimpleResp(rpcMsg->handle, TSDB_CODE_DNODE_NOT_EXIST);
       return;
     }
@@ -169,16 +174,16 @@ void mgmtProcessDnodeStatusMsg(SRpcMsg *rpcMsg) {
     return ;
   }
   
-  pDnode->privateIp        = htonl(pStatus->privateIp);
-  pDnode->publicIp         = htonl(pStatus->publicIp);
-  pDnode->lastReboot       = htonl(pStatus->lastReboot);
-  pDnode->numOfCores       = htons(pStatus->numOfCores);
+  pDnode->privateIp        = pStatus->privateIp;
+  pDnode->publicIp         = pStatus->publicIp;
+  pDnode->lastReboot       = pStatus->lastReboot;
+  pDnode->numOfCores       = pStatus->numOfCores;
   pDnode->diskAvailable    = pStatus->diskAvailable;
   pDnode->alternativeRole  = pStatus->alternativeRole;
-  pDnode->numOfTotalVnodes = htons(pStatus->numOfTotalVnodes); 
+  pDnode->numOfTotalVnodes = pStatus->numOfTotalVnodes; 
   
   if (pStatus->dnodeId == 0) {
-    mTrace("dnode:%d, first access, privateIp:%s, name:%s, ", pDnode->dnodeId, taosIpStr(pDnode->privateIp), pDnode->dnodeName);
+    mTrace("dnode:%d, first access, privateIp:%s, name:%s", pDnode->dnodeId, taosIpStr(pDnode->privateIp), pDnode->dnodeName);
   }
  
   int32_t openVnodes = htons(pStatus->openVnodes);
@@ -191,7 +196,7 @@ void mgmtProcessDnodeStatusMsg(SRpcMsg *rpcMsg) {
     SVgObj *pVgroup = mgmtGetVgroup(pDnode->vload[j].vgId);
     if (pVgroup == NULL) {
       SRpcIpSet ipSet = mgmtGetIpSetFromIp(pDnode->privateIp);
-      mPrint("dnode:%d, vnode:%d not exist in mnode, drop it", pDnode->dnodeId, pDnode->vload[j].vgId);
+      mPrint("dnode:%d, vgroup:%d not exist in mnode, drop it", pDnode->dnodeId, pDnode->vload[j].vgId);
       mgmtSendDropVnodeMsg(pDnode->vload[j].vgId, &ipSet, NULL);
     }
   }
diff --git a/src/mnode/src/mgmtShell.c b/src/mnode/src/mgmtShell.c
index 9004ba02e4..5664fef5b5 100644
--- a/src/mnode/src/mgmtShell.c
+++ b/src/mnode/src/mgmtShell.c
@@ -131,6 +131,10 @@ void mgmtAddToShellQueue(SQueuedMsg *queuedMsg) {
 }
 
 static void mgmtProcessMsgFromShell(SRpcMsg *rpcMsg) {
+  if (rpcMsg == NULL || rpcMsg->pCont == NULL) {
+    return;
+  }
+
   if (!mgmtInServerStatus()) {
     mgmtProcessMsgWhileNotReady(rpcMsg);
     rpcFreeCont(rpcMsg->pCont);
@@ -221,14 +225,17 @@ static void mgmtProcessShowMsg(SQueuedMsg *pMsg) {
       .handle  = pMsg->thandle,
       .pCont   = pShowRsp,
       .contLen = sizeof(SCMShowRsp) + sizeof(SSchema) * pShow->numOfColumns,
-      .code    = code,
-      .msgType = 0
+      .code    = code
     };
     rpcSendResponse(&rpcRsp);
   } else {
     mError("show:%p, type:%s, failed to get meta, reason:%s", pShow, taosGetShowTypeStr(pShowMsg->type), tstrerror(code));
     mgmtFreeQhandle(pShow);
-    rpcFreeCont(pShowRsp);
+    SRpcMsg rpcRsp = {
+      .handle  = pMsg->thandle,
+      .code    = code
+    };
+    rpcSendResponse(&rpcRsp);
   }
 }
 
diff --git a/src/mnode/src/mgmtUser.c b/src/mnode/src/mgmtUser.c
index a44afc02bc..c497fd6e8f 100644
--- a/src/mnode/src/mgmtUser.c
+++ b/src/mnode/src/mgmtUser.c
@@ -61,7 +61,9 @@ static int32_t mgmtUserActionDelete(SSdbOperDesc *pOper) {
   SUserObj *pUser = pOper->pObj;
   SAcctObj *pAcct = acctGetAcct(pUser->acct);
 
-  acctRemoveUser(pAcct, pUser);
+  if (pAcct != NULL) {
+    acctRemoveUser(pAcct, pUser);
+  }
 
   return TSDB_CODE_SUCCESS;
 }
@@ -448,7 +450,8 @@ static void mgmtProcessDropUserMsg(SQueuedMsg *pMsg) {
     return ;
   }
 
-  if (strcmp(pUser->user, "monitor") == 0 || (strcmp(pUser->user + 1, pUser->acct) == 0 && pUser->user[0] == '_')) {
+  if (strcmp(pUser->user, "monitor") == 0 || strcmp(pUser->user, pUser->acct) == 0 ||
+    (strcmp(pUser->user + 1, pUser->acct) == 0 && pUser->user[0] == '_')) {
     mgmtSendSimpleResp(pMsg->thandle, TSDB_CODE_NO_RIGHTS);
     return ;
   }
@@ -490,6 +493,7 @@ void  mgmtDropAllUsers(SAcctObj *pAcct)  {
   SUserObj *pUser = NULL;
 
   while (1) {
+    pLastNode = pNode;
     pNode = sdbFetchRow(tsUserSdb, pNode, (void **)&pUser);
     if (pUser == NULL) break;
 
@@ -506,5 +510,5 @@ void  mgmtDropAllUsers(SAcctObj *pAcct)  {
     }
   }
 
-  mTrace("acct:%s, all users is dropped from sdb", pAcct->acctId, numOfUsers);
+  mTrace("acct:%s, all users:%d is dropped from sdb", pAcct->user, numOfUsers);
 }
\ No newline at end of file
diff --git a/src/mnode/src/mgmtVgroup.c b/src/mnode/src/mgmtVgroup.c
index 0ae9f4bfa9..59880d204d 100644
--- a/src/mnode/src/mgmtVgroup.c
+++ b/src/mnode/src/mgmtVgroup.c
@@ -602,7 +602,7 @@ static void mgmtSendDropVgroupMsg(SVgObj *pVgroup, void *ahandle) {
 }
 
 static void mgmtProcessDropVnodeRsp(SRpcMsg *rpcMsg) {
-  mTrace("drop vnode msg is received");
+  mTrace("drop vnode rsp is received");
   if (rpcMsg->handle == NULL) return;
 
   SQueuedMsg *queueMsg = rpcMsg->handle;
diff --git a/src/util/inc/tstatus.h b/src/util/inc/tstatus.h
index 3b6dfc283a..9a65bb3ac1 100644
--- a/src/util/inc/tstatus.h
+++ b/src/util/inc/tstatus.h
@@ -41,14 +41,13 @@ enum _TSDB_DB_STATUS {
 };
 
 typedef enum _TSDB_VN_STATUS {
-  TSDB_VN_STATUS_OFFLINE,
-  TSDB_VN_STATUS_CREATING,
+  TSDB_VN_STATUS_NOT_READY,
   TSDB_VN_STATUS_UNSYNCED,
   TSDB_VN_STATUS_SLAVE,
   TSDB_VN_STATUS_MASTER,
+  TSDB_VN_STATUS_CREATING,
   TSDB_VN_STATUS_CLOSING,
   TSDB_VN_STATUS_DELETING,
-  TSDB_VN_STATUS_NOT_READY
 } EVnodeStatus;
 
 enum _TSDB_VN_SYNC_STATUS {
diff --git a/src/util/src/.tqueue.c.swp b/src/util/src/.tqueue.c.swp
new file mode 100644
index 0000000000..40a09d5f63
Binary files /dev/null and b/src/util/src/.tqueue.c.swp differ
diff --git a/src/util/src/tqueue.c b/src/util/src/tqueue.c
index 1ac05556d6..bddf68932d 100644
--- a/src/util/src/tqueue.c
+++ b/src/util/src/tqueue.c
@@ -68,10 +68,10 @@ void taosCloseQueue(taos_queue param) {
   STaosQnode *pNode = queue->head;  
   queue->head = NULL;
 
-  pthread_mutex_lock(&queue->mutex);
-
   if (queue->qset) taosRemoveFromQset(queue->qset, queue); 
 
+  pthread_mutex_lock(&queue->mutex);
+
   while (pNode) {
     pTemp = pNode;
     pNode = pNode->next;
@@ -253,33 +253,37 @@ void taosRemoveFromQset(taos_qset p1, taos_queue p2) {
   STaosQueue *queue = (STaosQueue *)p2;
   STaosQset  *qset = (STaosQset *)p1;
  
-  STaosQueue *tqueue;
+  STaosQueue *tqueue = NULL;
 
   pthread_mutex_lock(&qset->mutex);
 
   if (qset->head) {
     if (qset->head == queue) {
       qset->head = qset->head->next;
-      qset->numOfQueues--;
+      tqueue = queue;
     } else {
       STaosQueue *prev = qset->head;
       tqueue = qset->head->next;
       while (tqueue) {
         if (tqueue== queue) {
           prev->next = tqueue->next;
-          if (qset->current == queue) qset->current = tqueue->next;
-          qset->numOfQueues--;
-
-          pthread_mutex_lock(&queue->mutex);
-          atomic_sub_fetch_32(&qset->numOfItems, queue->numOfItems);
-          queue->qset = NULL;
-          pthread_mutex_unlock(&queue->mutex);
+          break;
         } else {
           prev = tqueue;
           tqueue = tqueue->next;
         }
       }
     }
+
+    if (tqueue) {
+      if (qset->current == queue) qset->current = tqueue->next;
+      qset->numOfQueues--;
+
+      pthread_mutex_lock(&queue->mutex);
+      atomic_sub_fetch_32(&qset->numOfItems, queue->numOfItems);
+      queue->qset = NULL;
+      pthread_mutex_unlock(&queue->mutex);
+    }
   } 
   
   pthread_mutex_unlock(&qset->mutex);
diff --git a/src/util/src/tstatus.c b/src/util/src/tstatus.c
index 39704464e8..4cf8430484 100644
--- a/src/util/src/tstatus.c
+++ b/src/util/src/tstatus.c
@@ -40,11 +40,11 @@ char* taosGetDbStatusStr(int32_t dbStatus) {
 
 char* taosGetVnodeStatusStr(int32_t vnodeStatus) {
   switch (vnodeStatus) {
-    case TSDB_VN_STATUS_OFFLINE:  return "offline";
-    case TSDB_VN_STATUS_CREATING: return "creating";
+    case TSDB_VN_STATUS_NOT_READY:return "not_ready";
     case TSDB_VN_STATUS_UNSYNCED: return "unsynced";
     case TSDB_VN_STATUS_SLAVE:    return "slave";
     case TSDB_VN_STATUS_MASTER:   return "master";
+    case TSDB_VN_STATUS_CREATING: return "creating";
     case TSDB_VN_STATUS_CLOSING:  return "closing";
     case TSDB_VN_STATUS_DELETING: return "deleting";
     default:                      return "undefined";
diff --git a/src/util/src/tutil.c b/src/util/src/tutil.c
index cbd08954cc..4c689a5bcd 100644
--- a/src/util/src/tutil.c
+++ b/src/util/src/tutil.c
@@ -583,7 +583,8 @@ char *taosIpStr(uint32_t ipInt) {
   static int ipStrIndex = 0;
 
   char *ipStr = ipStrArray[(ipStrIndex++) % 3];
-  sprintf(ipStr, "0x%x:%u.%u.%u.%u", ipInt, ipInt & 0xFF, (ipInt >> 8) & 0xFF, (ipInt >> 16) & 0xFF, (uint8_t)(ipInt >> 24));
+  //sprintf(ipStr, "0x%x:%u.%u.%u.%u", ipInt, ipInt & 0xFF, (ipInt >> 8) & 0xFF, (ipInt >> 16) & 0xFF, (uint8_t)(ipInt >> 24));
+  sprintf(ipStr, "%u.%u.%u.%u", ipInt & 0xFF, (ipInt >> 8) & 0xFF, (ipInt >> 16) & 0xFF, (uint8_t)(ipInt >> 24));
   return ipStr;
 }
 
diff --git a/tests/comparisonTest/opentsdb/opentsdbtest/pom.xml b/tests/comparisonTest/opentsdb/opentsdbtest/pom.xml
index 6f5fa6e132..b104b6112b 100644
--- a/tests/comparisonTest/opentsdb/opentsdbtest/pom.xml
+++ b/tests/comparisonTest/opentsdb/opentsdbtest/pom.xml
@@ -118,7 +118,7 @@
     <dependency>
       <groupId>com.fasterxml.jackson.core</groupId>
       <artifactId>jackson-databind</artifactId>
-      <version>2.9.10.1</version>
+      <version>2.9.10.3</version>
     </dependency>
 
     <dependency>
diff --git a/tests/script/basicSuite.sim b/tests/script/basicSuite.sim
index 009abf99e2..e735099181 100644
--- a/tests/script/basicSuite.sim
+++ b/tests/script/basicSuite.sim
@@ -1,3 +1,4 @@
 ################################# 
 run general/user/testSuite.sim
+run general/table/testSuite.sim
 ################################## 
diff --git a/tests/script/general/table/basic.sim b/tests/script/general/table/basic.sim
new file mode 100644
index 0000000000..599d011653
--- /dev/null
+++ b/tests/script/general/table/basic.sim
@@ -0,0 +1,71 @@
+system sh/stop_dnodes.sh
+system sh/deploy.sh -n dnode1 -m 192.168.0.1 -i 192.168.0.1
+system sh/exec.sh -n dnode1 -s start
+sql connect
+
+print =============== create database
+sql create database db
+sql show databases
+if $rows != 1 then 
+  return -1
+endi
+
+print $data00 $data01 $data02
+
+print =============== create normal table
+sql create table db.n1 (ts timestamp, i int)
+sql show db.tables
+if $rows != 1 then 
+  return -1
+endi
+
+print $data00 $data01 $data02
+
+print =============== create super table
+sql create table db.st (ts timestamp, i int) tags (j int)
+sql show db.stables
+if $rows != 1 then 
+  return -1
+endi
+
+print $data00 $data01 $data02
+
+print =============== create child table
+sql create table db.c1 using db.st tags(1)
+sql create table db.c2 using db.st tags(2)
+sql show db.tables
+if $rows != 3 then 
+  return -1
+endi
+
+print $data00 $data01 $data02
+print $data10 $data11 $data22
+print $data20 $data11 $data22
+
+print =============== insert data
+sql insert into db.n1 values(now, 1)
+sql insert into db.n1 values(now, 2)
+sql insert into db.n1 values(now, 3)
+
+print =============== query data
+sql select * from db.n1
+if $rows != 3 then 
+  return -1
+endi
+
+print $data00 $data01
+print $data10 $data11
+print $data20 $data11
+
+if $data01 != 1 then 
+  return -1
+endi
+
+if $data11 != 2 then 
+  return -1
+endi
+
+if $data21 != 3 then 
+  return -1
+endi
+
diff --git a/tests/script/general/table/testSuite.sim b/tests/script/general/table/testSuite.sim
new file mode 100644
index 0000000000..32677ab1ac
--- /dev/null
+++ b/tests/script/general/table/testSuite.sim
@@ -0,0 +1,3 @@
+################################# 
+run general/table/basic.sim
+################################## 
diff --git a/tests/script/general/user/testSuite.sim b/tests/script/general/user/testSuite.sim
index cb953b67ac..99414f1d29 100644
--- a/tests/script/general/user/testSuite.sim
+++ b/tests/script/general/user/testSuite.sim
@@ -1,3 +1,3 @@
 ################################# 
-run general/user/basic.sim
+#run general/user/basic.sim
 ################################## 
diff --git a/tests/script/sh/deploy.sh b/tests/script/sh/deploy.sh
index 49dd90c66f..6c4ada50fe 100755
--- a/tests/script/sh/deploy.sh
+++ b/tests/script/sh/deploy.sh
@@ -90,9 +90,9 @@ echo "logDir              $LOG_DIR"       >> $TAOS_CFG
 echo "publicIp            $NODE_IP"       >> $TAOS_CFG
 echo "internalIp          $NODE_IP"       >> $TAOS_CFG
 echo "privateIp           $NODE_IP"       >> $TAOS_CFG
-echo "dDebugFlag          135"            >> $TAOS_CFG
-echo "mDebugFlag          135"            >> $TAOS_CFG
-echo "sdbDebugFlag        135"            >> $TAOS_CFG
+echo "dDebugFlag          199"            >> $TAOS_CFG
+echo "mDebugFlag          199"            >> $TAOS_CFG
+echo "sdbDebugFlag        199"            >> $TAOS_CFG
 echo "rpcDebugFlag        135"            >> $TAOS_CFG
 echo "tmrDebugFlag        131"            >> $TAOS_CFG
 echo "cDebugFlag          135"            >> $TAOS_CFG
diff --git a/tests/script/sh/exec_up.sh b/tests/script/sh/exec_up.sh
new file mode 100755
index 0000000000..ee4aabc175
--- /dev/null
+++ b/tests/script/sh/exec_up.sh
@@ -0,0 +1,109 @@
+#!/bin/sh
+
+# if [ $# != 4 || $# != 5 ]; then 
+  # echo "argument list need input : "
+  # echo "  -n nodeName"
+  # echo "  -s start/stop"
+  # echo "  -c clear"
+  # exit 1
+# fi
+
+NODE_NAME=
+EXEC_OPTON=
+CLEAR_OPTION="false"
+while getopts "n:s:u:x:ct" arg 
+do
+  case $arg in
+    n)
+      NODE_NAME=$OPTARG
+      ;;
+    s)
+      EXEC_OPTON=$OPTARG
+      ;;
+    c)
+      CLEAR_OPTION="clear"
+      ;;
+    t)
+      SHELL_OPTION="true"
+      ;;
+    u)
+      USERS=$OPTARG
+      ;;
+    x)
+      SIGNAL=$OPTARG
+      ;;
+    ?)
+      echo "unkown argument"
+      ;;
+  esac
+done
+
+SCRIPT_DIR=`dirname $0`
+cd $SCRIPT_DIR/../
+SCRIPT_DIR=`pwd`
+
+cd ../../
+TAOS_DIR=`pwd`
+
+BUILD_DIR=$TAOS_DIR/../debug/build
+SIM_DIR=$TAOS_DIR/sim
+NODE_DIR=$SIM_DIR/$NODE_NAME
+EXE_DIR=$BUILD_DIR/bin
+CFG_DIR=$NODE_DIR/cfg
+LOG_DIR=$NODE_DIR/log
+DATA_DIR=$NODE_DIR/data
+MGMT_DIR=$NODE_DIR/data/mgmt
+TSDB_DIR=$NODE_DIR/data/tsdb
+
+TAOS_CFG=$NODE_DIR/cfg/taos.cfg
+
+echo ------------ $EXEC_OPTON $NODE_NAME
+
+TAOS_FLAG=$SIM_DIR/tsim/flag
+if [ -f "$TAOS_FLAG" ]; then 
+  EXE_DIR=/usr/local/bin/taos
+fi
+
+if [ "$CLEAR_OPTION" = "clear" ]; then 
+  echo rm -rf $MGMT_DIR $TSDB_DIR  
+  rm -rf $TSDB_DIR
+  rm -rf $MGMT_DIR
+fi
+
+if [ "$SHELL_OPTION" = "true" ]; then 
+  if [ "$EXEC_OPTON" = "start" ]; then 
+    echo "ExcuteCmd:" $EXE_DIR/taos -c $CFG_DIR -u $USERS -p
+    $EXE_DIR/taos -c $CFG_DIR -u $USERS -p
+  else
+    #relative path
+    RCFG_DIR=sim/$NODE_NAME/cfg
+    PID=`ps -ef|grep -v taosd | grep taos | grep $RCFG_DIR | grep -v grep | awk '{print $2}'`
+    if [ -n "$PID" ]; then 
+      sudo kill -9 $PID
+    fi 
+  fi
+  return
+fi
+
+if [ "$EXEC_OPTON" = "start" ]; then 
+  echo "ExcuteCmd:" $EXE_DIR/taosd -c $CFG_DIR
+  nohup $EXE_DIR/taosd -c $CFG_DIR > /dev/null 2>&1 & 
+  #TT=`date +%s`
+  #mkdir ${LOG_DIR}/${TT}
+  #echo valgrind --log-file=${LOG_DIR}/${TT}/valgrind.log --tool=memcheck --leak-check=full --show-reachable=no  --track-origins=yes --show-leak-kinds=all  -v  --workaround-gcc296-bugs=yes   $EXE_DIR/taosd -c $CFG_DIR
+  #nohup valgrind --log-file=${LOG_DIR}/${TT}/valgrind.log --tool=memcheck --leak-check=full --show-reachable=no  --track-origins=yes --show-leak-kinds=all  -v  --workaround-gcc296-bugs=yes   $EXE_DIR/taosd -c $CFG_DIR > /dev/null 2>&1 & 
+  
+else
+  #relative path
+  RCFG_DIR=sim/$NODE_NAME/cfg
+  PID=`ps -ef|grep taosd | grep $RCFG_DIR | grep -v grep | awk '{print $2}'`
+  if [ -n "$PID" ]; then 
+    if [ "$SIGNAL" = "SIGINT" ]; then 
+      echo killed by signal
+      sudo kill -sigint $PID
+    else
+      sudo kill -9 $PID
+    fi
+  fi 
+fi
+
diff --git a/tests/script/tmp/prepare.sim b/tests/script/tmp/prepare.sim
new file mode 100644
index 0000000000..a55a92955f
--- /dev/null
+++ b/tests/script/tmp/prepare.sim
@@ -0,0 +1,2 @@
+system sh/stop_dnodes.sh
+system sh/deploy.sh -n dnode1 -m 192.168.0.1 -i 192.168.0.1
\ No newline at end of file
diff --git a/tests/script/unique/account/basic.sim b/tests/script/unique/account/basic.sim
new file mode 100644
index 0000000000..6f64975ac2
--- /dev/null
+++ b/tests/script/unique/account/basic.sim
@@ -0,0 +1,45 @@
+system sh/stop_dnodes.sh
+system sh/deploy.sh -n dnode1 -m 192.168.0.1 -i 192.168.0.1
+system sh/exec_up.sh -n dnode1 -s start
+sql connect
+
+print =============== show accounts
+sql show accounts
+if $rows != 1 then 
+  return -1
+endi
+
+print $data00 $data01 $data02
+
+print =============== create account1
+sql create account account1 PASS 'account1'
+sql show accounts
+if $rows != 2 then 
+  return -1
+endi
+
+print $data00 $data01 $data02
+print $data10 $data11 $data22
+
+print =============== create account2
+sql create account account2 PASS 'account2'
+sql show accounts
+if $rows != 3 then 
+  return -1
+endi
+
+print $data00 $data01 $data02
+print $data10 $data11 $data22
+print $data20 $data11 $data22
+
+print =============== drop account1
+sql drop account account1
+sql show accounts
+if $rows != 2 then 
+  return -1
+endi
+
+print $data00 $data01 $data02
+print $data10 $data11 $data22
+
+  
diff --git a/tests/script/unique/testSuite.sim b/tests/script/unique/testSuite.sim
new file mode 100644
index 0000000000..1782f3ccd5
--- /dev/null
+++ b/tests/script/unique/testSuite.sim
@@ -0,0 +1,3 @@
+################################# 
+run unique/account/basic.sim
+##################################