diff --git a/include/dnode/mnode/mnode.h b/include/dnode/mnode/mnode.h
index ddd6f1c05f..ab090940f2 100644
--- a/include/dnode/mnode/mnode.h
+++ b/include/dnode/mnode/mnode.h
@@ -81,7 +81,7 @@ int32_t mndGetLoad(SMnode *pMnode, SMnodeLoad *pLoad);
  * @param pMsg The request msg.
  * @return int32_t 0 for success, -1 for failure.
  */
-int32_t mndProcessMsg(SRpcMsg *pMsg);
+int32_t mndProcessRpcMsg(SRpcMsg *pMsg);
 int32_t mndProcessSyncMsg(SRpcMsg *pMsg);
 
 /**
diff --git a/source/dnode/mgmt/mgmt_mnode/src/mmWorker.c b/source/dnode/mgmt/mgmt_mnode/src/mmWorker.c
index 85120102bc..1de9875d06 100644
--- a/source/dnode/mgmt/mgmt_mnode/src/mmWorker.c
+++ b/source/dnode/mgmt/mgmt_mnode/src/mmWorker.c
@@ -40,7 +40,7 @@ static void mmProcessQueue(SQueueInfo *pInfo, SRpcMsg *pMsg) {
       break;
     default:
       pMsg->info.node = pMgmt->pMnode;
-      code = mndProcessMsg(pMsg);
+      code = mndProcessRpcMsg(pMsg);
   }
 
   if (IsReq(pMsg) && pMsg->info.handle != NULL && code != TSDB_CODE_ACTION_IN_PROGRESS) {
diff --git a/source/dnode/mnode/impl/inc/mndInt.h b/source/dnode/mnode/impl/inc/mndInt.h
index cec49a4cbe..6661347e42 100644
--- a/source/dnode/mnode/impl/inc/mndInt.h
+++ b/source/dnode/mnode/impl/inc/mndInt.h
@@ -75,13 +75,12 @@ typedef struct {
 } STelemMgmt;
 
 typedef struct {
-  SWal      *pWal;
-  sem_t      syncSem;
-  int64_t    sync;
-  bool       standby;
-  bool       restored;
-  int32_t    errCode;
-  int32_t    transId;
+  SWal   *pWal;
+  sem_t   syncSem;
+  int64_t sync;
+  bool    standby;
+  int32_t errCode;
+  int32_t transId;
 } SSyncMgmt;
 
 typedef struct {
@@ -90,34 +89,45 @@ typedef struct {
 } SGrantInfo;
 
 typedef struct SMnode {
-  int32_t       selfDnodeId;
-  int64_t       clusterId;
-  TdThread      thread;
-  bool          deploy;
-  bool          stopped;
-  int8_t        replica;
-  int8_t        selfIndex;
-  SReplica      replicas[TSDB_MAX_REPLICA];
-  char         *path;
-  int64_t       checkTime;
-  SSdb         *pSdb;
-  SMgmtWrapper *pWrapper;
-  SArray       *pSteps;
-  SQHandle     *pQuery;
-  SShowMgmt     showMgmt;
-  SProfileMgmt  profileMgmt;
-  STelemMgmt    telemMgmt;
-  SSyncMgmt     syncMgmt;
-  SHashObj     *infosMeta;
-  SHashObj     *perfsMeta;
-  SGrantInfo    grant;
-  MndMsgFp      msgFp[TDMT_MAX];
-  SMsgCb        msgCb;
+  int32_t        selfDnodeId;
+  int64_t        clusterId;
+  TdThread       thread;
+  TdThreadRwlock lock;
+  int32_t        rpcRef;
+  int32_t        syncRef;
+  bool           stopped;
+  bool           restored;
+  bool           deploy;
+  int8_t         replica;
+  int8_t         selfIndex;
+  SReplica       replicas[TSDB_MAX_REPLICA];
+  char          *path;
+  int64_t        checkTime;
+  SSdb          *pSdb;
+  SArray        *pSteps;
+  SQHandle      *pQuery;
+  SHashObj      *infosMeta;
+  SHashObj      *perfsMeta;
+  SShowMgmt      showMgmt;
+  SProfileMgmt   profileMgmt;
+  STelemMgmt     telemMgmt;
+  SSyncMgmt      syncMgmt;
+  SGrantInfo     grant;
+  MndMsgFp       msgFp[TDMT_MAX];
+  SMsgCb         msgCb;
 } SMnode;
 
 void    mndSetMsgHandle(SMnode *pMnode, tmsg_t msgType, MndMsgFp fp);
 int64_t mndGenerateUid(char *name, int32_t len);
 
+int32_t mndAcquireRpcRef(SMnode *pMnode);
+void    mndReleaseRpcRef(SMnode *pMnode);
+void    mndSetRestore(SMnode *pMnode, bool restored);
+void    mndSetStop(SMnode *pMnode);
+bool    mndGetStop(SMnode *pMnode);
+int32_t mndAcquireSyncRef(SMnode *pMnode);
+void    mndReleaseSyncRef(SMnode *pMnode);
+
 #ifdef __cplusplus
 }
 #endif
diff --git a/source/dnode/mnode/impl/src/mnode.c b/source/dnode/mnode/impl/src/mndMain.c
similarity index 83%
rename from source/dnode/mnode/impl/src/mnode.c
rename to source/dnode/mnode/impl/src/mndMain.c
index 5458bc5126..995fe83cc5 100644
--- a/source/dnode/mnode/impl/src/mnode.c
+++ b/source/dnode/mnode/impl/src/mndMain.c
@@ -85,7 +85,7 @@ static void *mndThreadFp(void *param) {
   while (1) {
     lastTime++;
     taosMsleep(100);
-    if (pMnode->stopped) break;
+    if (mndGetStop(pMnode)) break;
 
     if (lastTime % (tsTransPullupInterval * 10) == 0) {
       mndPullupTrans(pMnode);
@@ -118,7 +118,6 @@ static int32_t mndInitTimer(SMnode *pMnode) {
 }
 
 static void mndCleanupTimer(SMnode *pMnode) {
-  pMnode->stopped = true;
   if (taosCheckPthreadValid(pMnode->thread)) {
     taosThreadJoin(pMnode->thread, NULL);
     taosThreadClear(&pMnode->thread);
@@ -335,15 +334,19 @@ void mndClose(SMnode *pMnode) {
 int32_t mndStart(SMnode *pMnode) {
   mndSyncStart(pMnode);
   if (pMnode->deploy) {
-    if (sdbDeploy(pMnode->pSdb) != 0) return -1;
-    pMnode->syncMgmt.restored = true;
+    if (sdbDeploy(pMnode->pSdb) != 0) {
+      mError("failed to deploy sdb while start mnode");
+      return -1;
+    }
+    mndSetRestore(pMnode, true);
   }
   return mndInitTimer(pMnode);
 }
 
 void mndStop(SMnode *pMnode) {
+  mndSetStop(pMnode);
   mndSyncStop(pMnode);
-  return mndCleanupTimer(pMnode);
+  mndCleanupTimer(pMnode);
 }
 
 int32_t mndProcessSyncMsg(SRpcMsg *pMsg) {
@@ -362,6 +365,11 @@ int32_t mndProcessSyncMsg(SRpcMsg *pMsg) {
     return TAOS_SYNC_PROPOSE_OTHER_ERROR;
   }
 
+  if (mndAcquireSyncRef(pMnode) != 0) {
+    mError("failed to process sync msg:%p type:%s since %s", pMsg, TMSG_INFO(pMsg->msgType), terrstr());
+    return TAOS_SYNC_PROPOSE_OTHER_ERROR;
+  }
+
   char  logBuf[512];
   char *syncNodeStr = sync2SimpleStr(pMgmt->sync);
   snprintf(logBuf, sizeof(logBuf), "==vnodeProcessSyncReq== msgType:%d, syncNode: %s", pMsg->msgType, syncNodeStr);
@@ -405,59 +413,45 @@ int32_t mndProcessSyncMsg(SRpcMsg *pMsg) {
     code = TAOS_SYNC_PROPOSE_OTHER_ERROR;
   }
 
+  mndReleaseSyncRef(pMnode);
   return code;
 }
 
-static int32_t mndCheckMnodeMaster(SRpcMsg *pMsg) {
-  if (!IsReq(pMsg)) return 0;
-  if (mndIsMaster(pMsg->info.node)) return 0;
+static int32_t mndCheckMnodeState(SRpcMsg *pMsg) {
+  if (mndAcquireRpcRef(pMsg->info.node) == 0) return 0;
 
-  if (pMsg->msgType == TDMT_MND_MQ_TIMER || pMsg->msgType == TDMT_MND_TELEM_TIMER ||
-      pMsg->msgType == TDMT_MND_TRANS_TIMER) {
-    return -1;
-  }
-  mError("msg:%p, failed to check master since %s, app:%p type:%s", pMsg, terrstr(), pMsg->info.ahandle,
-         TMSG_INFO(pMsg->msgType));
+  if (IsReq(pMsg) && pMsg->msgType != TDMT_MND_MQ_TIMER && pMsg->msgType != TDMT_MND_TELEM_TIMER &&
+      pMsg->msgType != TDMT_MND_TRANS_TIMER) {
+    mError("msg:%p, failed to check mnode state since %s, app:%p type:%s", pMsg, terrstr(), pMsg->info.ahandle,
+           TMSG_INFO(pMsg->msgType));
 
-  SEpSet epSet = {0};
-  mndGetMnodeEpSet(pMsg->info.node, &epSet);
+    SEpSet epSet = {0};
+    mndGetMnodeEpSet(pMsg->info.node, &epSet);
 
-#if 0
-  mTrace("msg:%p, is redirected, num:%d use:%d", pMsg, epSet.numOfEps, epSet.inUse);
-  for (int32_t i = 0; i < epSet.numOfEps; ++i) {
-    mTrace("mnode index:%d %s:%u", i, epSet.eps[i].fqdn, epSet.eps[i].port);
-    if (strcmp(epSet.eps[i].fqdn, tsLocalFqdn) == 0 && epSet.eps[i].port == tsServerPort) {
-      epSet.inUse = (i + 1) % epSet.numOfEps;
+    int32_t contLen = tSerializeSEpSet(NULL, 0, &epSet);
+    pMsg->info.rsp = rpcMallocCont(contLen);
+    if (pMsg->info.rsp != NULL) {
+      tSerializeSEpSet(pMsg->info.rsp, contLen, &epSet);
+      pMsg->info.rspLen = contLen;
+      terrno = TSDB_CODE_RPC_REDIRECT;
+    } else {
+      terrno = TSDB_CODE_OUT_OF_MEMORY;
     }
   }
-#endif  
-
-  int32_t contLen = tSerializeSEpSet(NULL, 0, &epSet);
-  pMsg->info.rsp = rpcMallocCont(contLen);
-  if (pMsg->info.rsp != NULL) {
-    tSerializeSEpSet(pMsg->info.rsp, contLen, &epSet);
-    pMsg->info.rspLen = contLen;
-    terrno = TSDB_CODE_RPC_REDIRECT;
-  } else {
-    terrno = TSDB_CODE_OUT_OF_MEMORY;
-  }
 
   return -1;
 }
 
-static int32_t mndCheckRequestValid(SRpcMsg *pMsg) {
+static int32_t mndCheckMsgContent(SRpcMsg *pMsg) {
   if (!IsReq(pMsg)) return 0;
   if (pMsg->contLen != 0 && pMsg->pCont != NULL) return 0;
 
-  mError("msg:%p, failed to valid request, app:%p type:%s", pMsg, pMsg->info.ahandle, TMSG_INFO(pMsg->msgType));
+  mError("msg:%p, failed to check msg content, app:%p type:%s", pMsg, pMsg->info.ahandle, TMSG_INFO(pMsg->msgType));
   terrno = TSDB_CODE_INVALID_MSG_LEN;
   return -1;
 }
 
-int32_t mndProcessMsg(SRpcMsg *pMsg) {
-  if (mndCheckMnodeMaster(pMsg) != 0) return -1;
-  if (mndCheckRequestValid(pMsg) != 0) return -1;
-
+int32_t mndProcessRpcMsg(SRpcMsg *pMsg) {
   SMnode  *pMnode = pMsg->info.node;
   MndMsgFp fp = pMnode->msgFp[TMSG_INDEX(pMsg->msgType)];
   if (fp == NULL) {
@@ -466,8 +460,13 @@ int32_t mndProcessMsg(SRpcMsg *pMsg) {
     return -1;
   }
 
-  mTrace("msg:%p, will be processed in mnode, app:%p type:%s", pMsg, pMsg->info.ahandle, TMSG_INFO(pMsg->msgType));
+  if (mndCheckMsgContent(pMsg) != 0) return -1;
+  if (mndCheckMnodeState(pMsg) != 0) return -1;
+
+  mTrace("msg:%p, start to process in mnode, app:%p type:%s", pMsg, pMsg->info.ahandle, TMSG_INFO(pMsg->msgType));
   int32_t code = (*fp)(pMsg);
+  mndReleaseRpcRef(pMnode);
+
   if (code == TSDB_CODE_ACTION_IN_PROGRESS) {
     mTrace("msg:%p, won't response immediately since in progress", pMsg);
   } else if (code == 0) {
@@ -476,6 +475,7 @@ int32_t mndProcessMsg(SRpcMsg *pMsg) {
     mError("msg:%p, failed to process since %s, app:%p type:%s", pMsg, terrstr(), pMsg->info.ahandle,
            TMSG_INFO(pMsg->msgType));
   }
+
   return code;
 }
 
@@ -502,7 +502,7 @@ int64_t mndGenerateUid(char *name, int32_t len) {
 
 int32_t mndGetMonitorInfo(SMnode *pMnode, SMonClusterInfo *pClusterInfo, SMonVgroupInfo *pVgroupInfo,
                           SMonGrantInfo *pGrantInfo) {
-  if (!mndIsMaster(pMnode)) return -1;
+  if (mndAcquireRpcRef(pMnode) != 0) return -1;
 
   SSdb   *pSdb = pMnode->pSdb;
   int64_t ms = taosGetTimestampMs();
@@ -511,6 +511,7 @@ int32_t mndGetMonitorInfo(SMnode *pMnode, SMonClusterInfo *pClusterInfo, SMonVgr
   pClusterInfo->mnodes = taosArrayInit(sdbGetSize(pSdb, SDB_MNODE), sizeof(SMonMnodeDesc));
   pVgroupInfo->vgroups = taosArrayInit(sdbGetSize(pSdb, SDB_VGROUP), sizeof(SMonVgroupDesc));
   if (pClusterInfo->dnodes == NULL || pClusterInfo->mnodes == NULL || pVgroupInfo->vgroups == NULL) {
+    mndReleaseRpcRef(pMnode);
     return -1;
   }
 
@@ -605,6 +606,7 @@ int32_t mndGetMonitorInfo(SMnode *pMnode, SMonClusterInfo *pClusterInfo, SMonVgr
     pGrantInfo->timeseries_total = INT32_MAX;
   }
 
+  mndReleaseRpcRef(pMnode);
   return 0;
 }
 
@@ -612,3 +614,76 @@ int32_t mndGetLoad(SMnode *pMnode, SMnodeLoad *pLoad) {
   pLoad->syncState = syncGetMyRole(pMnode->syncMgmt.sync);
   return 0;
 }
+
+int32_t mndAcquireRpcRef(SMnode *pMnode) {
+  int32_t code = 0;
+  taosThreadRwlockRdlock(&pMnode->lock);
+  if (pMnode->stopped) {
+    terrno = TSDB_CODE_APP_NOT_READY;
+    code = -1;
+  } else if (!mndIsMaster(pMnode)) {
+    code = -1;
+  } else {
+    int32_t ref = atomic_add_fetch_32(&pMnode->rpcRef, 1);
+    mTrace("mnode rpc is acquired, ref:%d", ref);
+  }
+  taosThreadRwlockUnlock(&pMnode->lock);
+  return code;
+}
+
+void mndReleaseRpcRef(SMnode *pMnode) {
+  taosThreadRwlockRdlock(&pMnode->lock);
+  int32_t ref = atomic_sub_fetch_32(&pMnode->rpcRef, 1);
+  mTrace("mnode rpc is released, ref:%d", ref);
+  taosThreadRwlockUnlock(&pMnode->lock);
+}
+
+void mndSetRestore(SMnode *pMnode, bool restored) {
+  if (restored) {
+    taosThreadRwlockWrlock(&pMnode->lock);
+    pMnode->restored = true;
+    taosThreadRwlockUnlock(&pMnode->lock);
+    mTrace("mnode set restored:%d", restored);
+  } else {
+    taosThreadRwlockWrlock(&pMnode->lock);
+    pMnode->restored = false;
+    taosThreadRwlockUnlock(&pMnode->lock);
+    mTrace("mnode set restored:%d", restored);
+    while (1) {
+      if (pMnode->rpcRef <= 0) break;
+      taosMsleep(3);
+    }
+  }
+}
+
+bool mndGetRestored(SMnode *pMnode) { return pMnode->restored; }
+
+void mndSetStop(SMnode *pMnode) {
+  taosThreadRwlockWrlock(&pMnode->lock);
+  pMnode->stopped = true;
+  taosThreadRwlockUnlock(&pMnode->lock);
+  mTrace("mnode set stopped");
+}
+
+bool mndGetStop(SMnode *pMnode) { return pMnode->stopped; }
+
+int32_t mndAcquireSyncRef(SMnode *pMnode) {
+  int32_t code = 0;
+  taosThreadRwlockRdlock(&pMnode->lock);
+  if (pMnode->stopped) {
+    terrno = TSDB_CODE_APP_NOT_READY;
+    code = -1;
+  } else {
+    int32_t ref = atomic_add_fetch_32(&pMnode->syncRef, 1);
+    mTrace("mnode sync is acquired, ref:%d", ref);
+  }
+  taosThreadRwlockUnlock(&pMnode->lock);
+  return code;
+}
+
+void mndReleaseSyncRef(SMnode *pMnode) {
+  taosThreadRwlockRdlock(&pMnode->lock);
+  int32_t ref = atomic_sub_fetch_32(&pMnode->syncRef, 1);
+  mTrace("mnode sync is released, ref:%d", ref);
+  taosThreadRwlockUnlock(&pMnode->lock);
+}
\ No newline at end of file
diff --git a/source/dnode/mnode/impl/src/mndSync.c b/source/dnode/mnode/impl/src/mndSync.c
index e25aa468bf..c6ab916ee1 100644
--- a/source/dnode/mnode/impl/src/mndSync.c
+++ b/source/dnode/mnode/impl/src/mndSync.c
@@ -63,7 +63,7 @@ void mndRestoreFinish(struct SSyncFSM *pFsm) {
   if (!pMnode->deploy) {
     mInfo("mnode sync restore finished");
     mndTransPullup(pMnode);
-    pMnode->syncMgmt.restored = true;
+    mndSetRestore(pMnode, true);
   }
 }
 
@@ -85,7 +85,7 @@ int32_t mndSnapshotRead(struct SSyncFSM *pFsm, const SSnapshot *pSnapshot, void
 
 int32_t mndSnapshotApply(struct SSyncFSM *pFsm, const SSnapshot *pSnapshot, char *pBuf, int32_t len) {
   SMnode *pMnode = pFsm->data;
-  pMnode->syncMgmt.restored = false;
+  mndSetRestore(pMnode, false);
   mInfo("start to apply snapshot to sdb, len:%d", len);
 
   int32_t code = sdbApplySnapshot(pMnode->pSdb, pBuf, len);
@@ -93,7 +93,7 @@ int32_t mndSnapshotApply(struct SSyncFSM *pFsm, const SSnapshot *pSnapshot, char
     mError("failed to apply snapshot to sdb, len:%d", len);
   } else {
     mInfo("successfully to apply snapshot to sdb, len:%d", len);
-    pMnode->syncMgmt.restored = true;
+    mndSetRestore(pMnode, true);
   }
 
   // taosMemoryFree(pBuf);
@@ -250,7 +250,7 @@ bool mndIsMaster(SMnode *pMnode) {
     return false;
   }
 
-  if (!pMgmt->restored) {
+  if (!pMnode->restored) {
     terrno = TSDB_CODE_APP_NOT_READY;
     return false;
   }
diff --git a/source/dnode/mnode/sdb/inc/sdb.h b/source/dnode/mnode/sdb/inc/sdb.h
index 32e29f5e1c..411d4c59ea 100644
--- a/source/dnode/mnode/sdb/inc/sdb.h
+++ b/source/dnode/mnode/sdb/inc/sdb.h
@@ -166,7 +166,6 @@ typedef struct SSdbRow {
 typedef struct SSdb {
   SMnode        *pMnode;
   char          *currDir;
-  char          *syncDir;
   char          *tmpDir;
   int64_t        lastCommitVer;
   int64_t        curVer;
@@ -182,6 +181,7 @@ typedef struct SSdb {
   SdbDeployFp    deployFps[SDB_MAX];
   SdbEncodeFp    encodeFps[SDB_MAX];
   SdbDecodeFp    decodeFps[SDB_MAX];
+  TdThreadMutex  filelock;
 } SSdb;
 
 typedef struct SSdbIter {
diff --git a/source/dnode/mnode/sdb/src/sdb.c b/source/dnode/mnode/sdb/src/sdb.c
index d289e30d7b..aef3476440 100644
--- a/source/dnode/mnode/sdb/src/sdb.c
+++ b/source/dnode/mnode/sdb/src/sdb.c
@@ -56,6 +56,7 @@ SSdb *sdbInit(SSdbOpt *pOption) {
   pSdb->curTerm = -1;
   pSdb->lastCommitVer = -1;
   pSdb->pMnode = pOption->pMnode;
+  taosThreadMutexInit(&pSdb->filelock, NULL);
   mDebug("sdb init successfully");
   return pSdb;
 }
@@ -69,10 +70,6 @@ void sdbCleanup(SSdb *pSdb) {
     taosMemoryFreeClear(pSdb->currDir);
   }
 
-  if (pSdb->syncDir != NULL) {
-    taosMemoryFreeClear(pSdb->syncDir);
-  }
-
   if (pSdb->tmpDir != NULL) {
     taosMemoryFreeClear(pSdb->tmpDir);
   }
@@ -104,6 +101,7 @@ void sdbCleanup(SSdb *pSdb) {
     mDebug("sdb table:%s is cleaned up", sdbTableName(i));
   }
 
+  taosThreadMutexDestroy(&pSdb->filelock);
   taosMemoryFree(pSdb);
   mDebug("sdb is cleaned up");
 }
diff --git a/source/dnode/mnode/sdb/src/sdbFile.c b/source/dnode/mnode/sdb/src/sdbFile.c
index 46abd5e8b2..b2dcbd68e3 100644
--- a/source/dnode/mnode/sdb/src/sdbFile.c
+++ b/source/dnode/mnode/sdb/src/sdbFile.c
@@ -22,13 +22,14 @@
 #define SDB_RESERVE_SIZE 512
 #define SDB_FILE_VER     1
 
-static int32_t sdbRunDeployFp(SSdb *pSdb) {
+static int32_t sdbDeployData(SSdb *pSdb) {
   mDebug("start to deploy sdb");
 
   for (int32_t i = SDB_MAX - 1; i >= 0; --i) {
     SdbDeployFp fp = pSdb->deployFps[i];
     if (fp == NULL) continue;
 
+    mDebug("start to deploy sdb:%s", sdbTableName(i));
     if ((*fp)(pSdb->pMnode) != 0) {
       mError("failed to deploy sdb:%s since %s", sdbTableName(i), terrstr());
       return -1;
@@ -39,6 +40,39 @@ static int32_t sdbRunDeployFp(SSdb *pSdb) {
   return 0;
 }
 
+static void sdbResetData(SSdb *pSdb) {
+  mDebug("start to reset sdb");
+
+  for (ESdbType i = 0; i < SDB_MAX; ++i) {
+    SHashObj *hash = pSdb->hashObjs[i];
+    if (hash == NULL) continue;
+
+    SSdbRow **ppRow = taosHashIterate(hash, NULL);
+    while (ppRow != NULL) {
+      SSdbRow *pRow = *ppRow;
+      if (pRow == NULL) continue;
+
+      sdbFreeRow(pSdb, pRow, true);
+      ppRow = taosHashIterate(hash, ppRow);
+    }
+  }
+
+  for (ESdbType i = 0; i < SDB_MAX; ++i) {
+    SHashObj *hash = pSdb->hashObjs[i];
+    if (hash == NULL) continue;
+
+    taosHashClear(pSdb->hashObjs[i]);
+    pSdb->tableVer[i] = 0;
+    pSdb->maxId[i] = 0;
+    mDebug("sdb:%s is reset", sdbTableName(i));
+  }
+
+  pSdb->curVer = -1;
+  pSdb->curTerm = -1;
+  pSdb->lastCommitVer = -1;
+  mDebug("sdb reset successfully");
+}
+
 static int32_t sdbReadFileHead(SSdb *pSdb, TdFilePtr pFile) {
   int64_t sver = 0;
   int32_t ret = taosReadFile(pFile, &sver, sizeof(int64_t));
@@ -169,11 +203,15 @@ static int32_t sdbWriteFileHead(SSdb *pSdb, TdFilePtr pFile) {
   return 0;
 }
 
-int32_t sdbReadFile(SSdb *pSdb) {
+static int32_t sdbReadFileImp(SSdb *pSdb) {
   int64_t offset = 0;
   int32_t code = 0;
   int32_t readLen = 0;
   int64_t ret = 0;
+  char    file[PATH_MAX] = {0};
+
+  snprintf(file, sizeof(file), "%s%ssdb.data", pSdb->currDir, TD_DIRSEP);
+  mDebug("start to read file:%s", file);
 
   SSdbRaw *pRaw = taosMemoryMalloc(WAL_MAX_SIZE + 100);
   if (pRaw == NULL) {
@@ -182,10 +220,6 @@ int32_t sdbReadFile(SSdb *pSdb) {
     return -1;
   }
 
-  char file[PATH_MAX] = {0};
-  snprintf(file, sizeof(file), "%s%ssdb.data", pSdb->currDir, TD_DIRSEP);
-  mDebug("start to read file:%s", file);
-
   TdFilePtr pFile = taosOpenFile(file, TD_FILE_READ);
   if (pFile == NULL) {
     taosMemoryFree(pRaw);
@@ -196,8 +230,6 @@ int32_t sdbReadFile(SSdb *pSdb) {
 
   if (sdbReadFileHead(pSdb, pFile) != 0) {
     mError("failed to read file:%s head since %s", file, terrstr());
-    pSdb->curVer = -1;
-    pSdb->curTerm = -1;
     taosMemoryFree(pRaw);
     taosCloseFile(&pFile);
     return -1;
@@ -264,6 +296,20 @@ _OVER:
   return code;
 }
 
+int32_t sdbReadFile(SSdb *pSdb) {
+  taosThreadMutexLock(&pSdb->filelock);
+
+  sdbResetData(pSdb);
+  int32_t code = sdbReadFileImp(pSdb);
+  if (code != 0) {
+    mError("failed to read sdb since %s", terrstr());
+    sdbResetData(pSdb);
+  }
+
+  taosThreadMutexUnlock(&pSdb->filelock);
+  return code;
+}
+
 static int32_t sdbWriteFileImp(SSdb *pSdb) {
   int32_t code = 0;
 
@@ -378,15 +424,21 @@ int32_t sdbWriteFile(SSdb *pSdb) {
     return 0;
   }
 
-  return sdbWriteFileImp(pSdb);
+  taosThreadMutexLock(&pSdb->filelock);
+  int32_t code = sdbWriteFileImp(pSdb);
+  if (code != 0) {
+    mError("failed to write sdb since %s", terrstr());
+  }
+  taosThreadMutexUnlock(&pSdb->filelock);
+  return code;
 }
 
 int32_t sdbDeploy(SSdb *pSdb) {
-  if (sdbRunDeployFp(pSdb) != 0) {
+  if (sdbDeployData(pSdb) != 0) {
     return -1;
   }
 
-  if (sdbWriteFileImp(pSdb) != 0) {
+  if (sdbWriteFile(pSdb) != 0) {
     return -1;
   }
 
@@ -397,13 +449,16 @@ static SSdbIter *sdbOpenIter(SSdb *pSdb) {
   char datafile[PATH_MAX] = {0};
   char tmpfile[PATH_MAX] = {0};
   snprintf(datafile, sizeof(datafile), "%s%ssdb.data", pSdb->currDir, TD_DIRSEP);
-  snprintf(tmpfile, sizeof(datafile), "%s%ssdb.data", pSdb->tmpDir, TD_DIRSEP);
+  snprintf(tmpfile, sizeof(tmpfile), "%s%ssdb.data", pSdb->tmpDir, TD_DIRSEP);
 
+  taosThreadMutexLock(&pSdb->filelock);
   if (taosCopyFile(datafile, tmpfile) != 0) {
+    taosThreadMutexUnlock(&pSdb->filelock);
     terrno = TAOS_SYSTEM_ERROR(errno);
     mError("failed to copy file %s to %s since %s", datafile, tmpfile, terrstr());
     return NULL;
   }
+  taosThreadMutexUnlock(&pSdb->filelock);
 
   SSdbIter *pIter = taosMemoryCalloc(1, sizeof(SSdbIter));
   if (pIter == NULL) {
@@ -422,11 +477,16 @@ static SSdbIter *sdbOpenIter(SSdb *pSdb) {
   return pIter;
 }
 
-static void sdbCloseIter(SSdbIter *pIter) {
+static void sdbCloseIter(SSdb *pSdb, SSdbIter *pIter) {
   if (pIter == NULL) return;
   if (pIter->file != NULL) {
     taosCloseFile(&pIter->file);
   }
+
+  char tmpfile[PATH_MAX] = {0};
+  snprintf(tmpfile, sizeof(tmpfile), "%s%ssdb.data", pSdb->tmpDir, TD_DIRSEP);
+  taosRemoveFile(tmpfile);
+
   taosMemoryFree(pIter);
   mInfo("sdbiter:%p, is closed", pIter);
 }
@@ -453,15 +513,14 @@ static SSdbIter *sdbGetIter(SSdb *pSdb, SSdbIter **ppIter) {
 }
 
 int32_t sdbReadSnapshot(SSdb *pSdb, SSdbIter **ppIter, char **ppBuf, int32_t *len) {
-  const int32_t maxlen = 100;
-
   SSdbIter *pIter = sdbGetIter(pSdb, ppIter);
   if (pIter == NULL) return -1;
 
-  char *pBuf = taosMemoryCalloc(1, maxlen);
+  int32_t maxlen = 100;
+  char   *pBuf = taosMemoryCalloc(1, maxlen);
   if (pBuf == NULL) {
     terrno = TSDB_CODE_OUT_OF_MEMORY;
-    sdbCloseIter(pIter);
+    sdbCloseIter(pSdb, pIter);
     return -1;
   }
 
@@ -472,7 +531,7 @@ int32_t sdbReadSnapshot(SSdb *pSdb, SSdbIter **ppIter, char **ppBuf, int32_t *le
     *ppBuf = NULL;
     *len = 0;
     *ppIter = NULL;
-    sdbCloseIter(pIter);
+    sdbCloseIter(pSdb, pIter);
     taosMemoryFree(pBuf);
     return -1;
   } else if (readlen == 0) {
@@ -480,7 +539,7 @@ int32_t sdbReadSnapshot(SSdb *pSdb, SSdbIter **ppIter, char **ppBuf, int32_t *le
     *ppBuf = NULL;
     *len = 0;
     *ppIter = NULL;
-    sdbCloseIter(pIter);
+    sdbCloseIter(pSdb, pIter);
     taosMemoryFree(pBuf);
     return 0;
   } else if ((readlen < maxlen && errno != 0) || readlen == maxlen) {
@@ -494,7 +553,7 @@ int32_t sdbReadSnapshot(SSdb *pSdb, SSdbIter **ppIter, char **ppBuf, int32_t *le
     *ppBuf = pBuf;
     *len = readlen;
     *ppIter = NULL;
-    sdbCloseIter(pIter);
+    sdbCloseIter(pSdb, pIter);
     return 0;
   } else {
     // impossible
@@ -502,7 +561,7 @@ int32_t sdbReadSnapshot(SSdb *pSdb, SSdbIter **ppIter, char **ppBuf, int32_t *le
     *ppBuf = NULL;
     *len = 0;
     *ppIter = NULL;
-    sdbCloseIter(pIter);
+    sdbCloseIter(pSdb, pIter);
     taosMemoryFree(pBuf);
     return -1;
   }
@@ -512,7 +571,7 @@ int32_t sdbApplySnapshot(SSdb *pSdb, char *pBuf, int32_t len) {
   char datafile[PATH_MAX] = {0};
   char tmpfile[PATH_MAX] = {0};
   snprintf(datafile, sizeof(datafile), "%s%ssdb.data", pSdb->currDir, TD_DIRSEP);
-  snprintf(tmpfile, sizeof(datafile), "%s%ssdb.data", pSdb->tmpDir, TD_DIRSEP);
+  snprintf(tmpfile, sizeof(tmpfile), "%s%ssdb.data", pSdb->tmpDir, TD_DIRSEP);
 
   TdFilePtr pFile = taosOpenFile(tmpfile, TD_FILE_CREATE | TD_FILE_WRITE | TD_FILE_TRUNC);
   if (pFile == NULL) {