diff --git a/include/dnode/mnode/mnode.h b/include/dnode/mnode/mnode.h
index f2c8c916c8..69260d720c 100644
--- a/include/dnode/mnode/mnode.h
+++ b/include/dnode/mnode/mnode.h
@@ -29,6 +29,7 @@ extern "C" {
 typedef struct SMnode SMnode;
 
 typedef struct {
+  bool     standby;
   bool     deploy;
   int8_t   replica;
   int8_t   selfIndex;
diff --git a/include/dnode/mnode/sdb/sdb.h b/include/dnode/mnode/sdb/sdb.h
index 94d41a7416..a9e2f5a71a 100644
--- a/include/dnode/mnode/sdb/sdb.h
+++ b/include/dnode/mnode/sdb/sdb.h
@@ -44,12 +44,9 @@ extern "C" {
   }
 
 #define SDB_GET_INT64(pData, dataPos, val, pos) SDB_GET_VAL(pData, dataPos, val, pos, sdbGetRawInt64, int64_t)
-
 #define SDB_GET_INT32(pData, dataPos, val, pos) SDB_GET_VAL(pData, dataPos, val, pos, sdbGetRawInt32, int32_t)
-
 #define SDB_GET_INT16(pData, dataPos, val, pos) SDB_GET_VAL(pData, dataPos, val, pos, sdbGetRawInt16, int16_t)
-
-#define SDB_GET_INT8(pData, dataPos, val, pos) SDB_GET_VAL(pData, dataPos, val, pos, sdbGetRawInt8, int8_t)
+#define SDB_GET_INT8(pData, dataPos, val, pos)  SDB_GET_VAL(pData, dataPos, val, pos, sdbGetRawInt8, int8_t)
 
 #define SDB_GET_RESERVE(pRaw, dataPos, valLen, pos) \
   {                                                 \
@@ -66,11 +63,8 @@ extern "C" {
   }
 
 #define SDB_SET_INT64(pRaw, dataPos, val, pos) SDB_SET_VAL(pRaw, dataPos, val, pos, sdbSetRawInt64, int64_t)
-
 #define SDB_SET_INT32(pRaw, dataPos, val, pos) SDB_SET_VAL(pRaw, dataPos, val, pos, sdbSetRawInt32, int32_t)
-
 #define SDB_SET_INT16(pRaw, dataPos, val, pos) SDB_SET_VAL(pRaw, dataPos, val, pos, sdbSetRawInt16, int16_t)
-
 #define SDB_SET_INT8(pRaw, dataPos, val, pos) SDB_SET_VAL(pRaw, dataPos, val, pos, sdbSetRawInt8, int8_t)
 
 #define SDB_SET_BINARY(pRaw, dataPos, val, valLen, pos)     \
@@ -356,6 +350,14 @@ typedef struct SSdb {
   SdbDecodeFp    decodeFps[SDB_MAX];
 } SSdb;
 
+typedef struct SSdbIter {
+  TdFilePtr file;
+  int64_t   readlen;
+} SSdbIter;
+
+SSdbIter *sdbIterInit(SSdb *pSdb);
+SSdbIter *sdbIterRead(SSdb *pSdb, SSdbIter *iter, char **ppBuf, int32_t *len);
+
 #ifdef __cplusplus
 }
 #endif
diff --git a/include/libs/sync/sync.h b/include/libs/sync/sync.h
index 2bf678fa48..5ffcbb7a09 100644
--- a/include/libs/sync/sync.h
+++ b/include/libs/sync/sync.h
@@ -82,14 +82,29 @@ typedef struct SFsmCbMeta {
   SyncTerm   currentTerm;
 } SFsmCbMeta;
 
+typedef struct SReConfigCbMeta {
+  int32_t   code;
+  SyncIndex index;
+  SyncTerm  term;
+  SyncTerm  currentTerm;
+} SReConfigCbMeta;
+
 typedef struct SSyncFSM {
   void* data;
+
   void (*FpCommitCb)(struct SSyncFSM* pFsm, const SRpcMsg* pMsg, SFsmCbMeta cbMeta);
   void (*FpPreCommitCb)(struct SSyncFSM* pFsm, const SRpcMsg* pMsg, SFsmCbMeta cbMeta);
   void (*FpRollBackCb)(struct SSyncFSM* pFsm, const SRpcMsg* pMsg, SFsmCbMeta cbMeta);
-  void (*FpRestoreFinish)(struct SSyncFSM* pFsm);
+
+  void (*FpRestoreFinishCb)(struct SSyncFSM* pFsm);
   int32_t (*FpGetSnapshot)(struct SSyncFSM* pFsm, SSnapshot* pSnapshot);
-  int32_t (*FpRestoreSnapshot)(struct SSyncFSM* pFsm, const SSnapshot* snapshot);
+  void* (*FpSnapshotRead)(struct SSyncFSM* pFsm, const SSnapshot* snapshot, void* iter, char** ppBuf, int32_t* len);
+  int32_t (*FpSnapshotApply)(struct SSyncFSM* pFsm, const SSnapshot* snapshot, char* pBuf, int32_t len);
+
+  void (*FpReConfigCb)(struct SSyncFSM* pFsm, SSyncCfg newCfg, SReConfigCbMeta cbMeta);
+
+  // int32_t (*FpRestoreSnapshot)(struct SSyncFSM* pFsm, const SSnapshot* snapshot);
+
 } SSyncFSM;
 
 // abstract definition of log store in raft
diff --git a/include/util/tdef.h b/include/util/tdef.h
index 808fcf0152..59b72d8785 100644
--- a/include/util/tdef.h
+++ b/include/util/tdef.h
@@ -428,11 +428,11 @@ enum {
 };
 
 #define DEFAULT_HANDLE 0
-#define MNODE_HANDLE   -1
-#define QNODE_HANDLE   -2
-#define SNODE_HANDLE   -3
-#define VNODE_HANDLE   -4
-#define BNODE_HANDLE   -5
+#define MNODE_HANDLE   1
+#define QNODE_HANDLE   -1
+#define SNODE_HANDLE   -2
+#define VNODE_HANDLE   -3
+#define BNODE_HANDLE   -4
 
 #define TSDB_CONFIG_OPTION_LEN 16
 #define TSDB_CONIIG_VALUE_LEN  48
diff --git a/source/dnode/mgmt/mgmt_mnode/src/mmFile.c b/source/dnode/mgmt/mgmt_mnode/src/mmFile.c
index 2aa1087770..478d6abd52 100644
--- a/source/dnode/mgmt/mgmt_mnode/src/mmFile.c
+++ b/source/dnode/mgmt/mgmt_mnode/src/mmFile.c
@@ -53,43 +53,45 @@ int32_t mmReadFile(SMnodeMgmt *pMgmt, bool *pDeployed) {
   *pDeployed = deployed->valueint;
 
   cJSON *mnodes = cJSON_GetObjectItem(root, "mnodes");
-  if (!mnodes || mnodes->type != cJSON_Array) {
-    dError("failed to read %s since nodes not found", file);
-    goto _OVER;
-  }
-
-  pMgmt->replica = cJSON_GetArraySize(mnodes);
-  if (pMgmt->replica <= 0 || pMgmt->replica > TSDB_MAX_REPLICA) {
-    dError("failed to read %s since mnodes size %d invalid", file, pMgmt->replica);
-    goto _OVER;
-  }
-
-  for (int32_t i = 0; i < pMgmt->replica; ++i) {
-    cJSON *node = cJSON_GetArrayItem(mnodes, i);
-    if (node == NULL) break;
-
-    SReplica *pReplica = &pMgmt->replicas[i];
-
-    cJSON *id = cJSON_GetObjectItem(node, "id");
-    if (!id || id->type != cJSON_Number) {
-      dError("failed to read %s since id not found", file);
+  if (mnodes != NULL) {
+    if (!mnodes || mnodes->type != cJSON_Array) {
+      dError("failed to read %s since nodes not found", file);
       goto _OVER;
     }
-    pReplica->id = id->valueint;
 
-    cJSON *fqdn = cJSON_GetObjectItem(node, "fqdn");
-    if (!fqdn || fqdn->type != cJSON_String || fqdn->valuestring == NULL) {
-      dError("failed to read %s since fqdn not found", file);
+    pMgmt->replica = cJSON_GetArraySize(mnodes);
+    if (pMgmt->replica <= 0 || pMgmt->replica > TSDB_MAX_REPLICA) {
+      dError("failed to read %s since mnodes size %d invalid", file, pMgmt->replica);
       goto _OVER;
     }
-    tstrncpy(pReplica->fqdn, fqdn->valuestring, TSDB_FQDN_LEN);
 
-    cJSON *port = cJSON_GetObjectItem(node, "port");
-    if (!port || port->type != cJSON_Number) {
-      dError("failed to read %s since port not found", file);
-      goto _OVER;
+    for (int32_t i = 0; i < pMgmt->replica; ++i) {
+      cJSON *node = cJSON_GetArrayItem(mnodes, i);
+      if (node == NULL) break;
+
+      SReplica *pReplica = &pMgmt->replicas[i];
+
+      cJSON *id = cJSON_GetObjectItem(node, "id");
+      if (!id || id->type != cJSON_Number) {
+        dError("failed to read %s since id not found", file);
+        goto _OVER;
+      }
+      pReplica->id = id->valueint;
+
+      cJSON *fqdn = cJSON_GetObjectItem(node, "fqdn");
+      if (!fqdn || fqdn->type != cJSON_String || fqdn->valuestring == NULL) {
+        dError("failed to read %s since fqdn not found", file);
+        goto _OVER;
+      }
+      tstrncpy(pReplica->fqdn, fqdn->valuestring, TSDB_FQDN_LEN);
+
+      cJSON *port = cJSON_GetObjectItem(node, "port");
+      if (!port || port->type != cJSON_Number) {
+        dError("failed to read %s since port not found", file);
+        goto _OVER;
+      }
+      pReplica->port = port->valueint;
     }
-    pReplica->port = port->valueint;
   }
 
   code = 0;
@@ -122,21 +124,23 @@ int32_t mmWriteFile(SMnodeMgmt *pMgmt, SDCreateMnodeReq *pMsg, bool deployed) {
   char   *content = taosMemoryCalloc(1, maxLen + 1);
 
   len += snprintf(content + len, maxLen - len, "{\n");
-  len += snprintf(content + len, maxLen - len, "  \"mnodes\": [{\n");
 
   int8_t replica = (pMsg != NULL ? pMsg->replica : pMgmt->replica);
-  for (int32_t i = 0; i < replica; ++i) {
-    SReplica *pReplica = &pMgmt->replicas[i];
-    if (pMsg != NULL) {
-      pReplica = &pMsg->replicas[i];
-    }
-    len += snprintf(content + len, maxLen - len, "    \"id\": %d,\n", pReplica->id);
-    len += snprintf(content + len, maxLen - len, "    \"fqdn\": \"%s\",\n", pReplica->fqdn);
-    len += snprintf(content + len, maxLen - len, "    \"port\": %u\n", pReplica->port);
-    if (i < replica - 1) {
-      len += snprintf(content + len, maxLen - len, "  },{\n");
-    } else {
-      len += snprintf(content + len, maxLen - len, "  }],\n");
+  if (replica > 0) {
+    len += snprintf(content + len, maxLen - len, "  \"mnodes\": [{\n");
+    for (int32_t i = 0; i < replica; ++i) {
+      SReplica *pReplica = &pMgmt->replicas[i];
+      if (pMsg != NULL) {
+        pReplica = &pMsg->replicas[i];
+      }
+      len += snprintf(content + len, maxLen - len, "    \"id\": %d,\n", pReplica->id);
+      len += snprintf(content + len, maxLen - len, "    \"fqdn\": \"%s\",\n", pReplica->fqdn);
+      len += snprintf(content + len, maxLen - len, "    \"port\": %u\n", pReplica->port);
+      if (i < replica - 1) {
+        len += snprintf(content + len, maxLen - len, "  },{\n");
+      } else {
+        len += snprintf(content + len, maxLen - len, "  }],\n");
+      }
     }
   }
 
diff --git a/source/dnode/mgmt/mgmt_mnode/src/mmInt.c b/source/dnode/mgmt/mgmt_mnode/src/mmInt.c
index 43113d05af..875be9768c 100644
--- a/source/dnode/mgmt/mgmt_mnode/src/mmInt.c
+++ b/source/dnode/mgmt/mgmt_mnode/src/mmInt.c
@@ -39,32 +39,44 @@ static int32_t mmRequire(const SMgmtInputOpt *pInput, bool *required) {
 }
 
 static void mmBuildOptionForDeploy(SMnodeMgmt *pMgmt, const SMgmtInputOpt *pInput, SMnodeOpt *pOption) {
+  pOption->standby = false;
+  pOption->deploy = true;
   pOption->msgCb = pMgmt->msgCb;
   pOption->replica = 1;
   pOption->selfIndex = 0;
+
   SReplica *pReplica = &pOption->replicas[0];
   pReplica->id = 1;
   pReplica->port = tsServerPort;
   tstrncpy(pReplica->fqdn, tsLocalFqdn, TSDB_FQDN_LEN);
-  pOption->deploy = true;
-
-  pMgmt->selfIndex = pOption->selfIndex;
-  pMgmt->replica = pOption->replica;
-  memcpy(&pMgmt->replicas, pOption->replicas, sizeof(SReplica) * TSDB_MAX_REPLICA);
 }
 
 static void mmBuildOptionForOpen(SMnodeMgmt *pMgmt, SMnodeOpt *pOption) {
   pOption->msgCb = pMgmt->msgCb;
-  pOption->selfIndex = pMgmt->selfIndex;
-  pOption->replica = pMgmt->replica;
-  memcpy(&pOption->replicas, pMgmt->replicas, sizeof(SReplica) * TSDB_MAX_REPLICA);
   pOption->deploy = false;
+  pOption->standby = false;
+
+  if (pMgmt->replica > 0) {
+    pOption->standby = true;
+    pOption->replica = 1;
+    pOption->selfIndex = 0;
+    SReplica *pReplica = &pOption->replicas[0];
+    for (int32_t i = 0; i < pMgmt->replica; ++i) {
+      if (pMgmt->replicas[i].id != pMgmt->pData->dnodeId) continue;
+      pReplica->id = pMgmt->replicas[i].id;
+      pReplica->port = pMgmt->replicas[i].port;
+      memcpy(pReplica->fqdn, pMgmt->replicas[i].fqdn, TSDB_FQDN_LEN);
+    }
+  }
 }
 
-static int32_t mmBuildOptionFromReq(SMnodeMgmt *pMgmt, SMnodeOpt *pOption, SDCreateMnodeReq *pCreate) {
+static int32_t mmBuildOptionForAlter(SMnodeMgmt *pMgmt, SMnodeOpt *pOption, SDCreateMnodeReq *pCreate) {
   pOption->msgCb = pMgmt->msgCb;
+  pOption->standby = false;
+  pOption->deploy = false;
   pOption->replica = pCreate->replica;
   pOption->selfIndex = -1;
+
   for (int32_t i = 0; i < pCreate->replica; ++i) {
     SReplica *pReplica = &pOption->replicas[i];
     pReplica->id = pCreate->replicas[i].id;
@@ -79,17 +91,13 @@ static int32_t mmBuildOptionFromReq(SMnodeMgmt *pMgmt, SMnodeOpt *pOption, SDCre
     dError("failed to build mnode options since %s", terrstr());
     return -1;
   }
-  pOption->deploy = true;
 
-  pMgmt->selfIndex = pOption->selfIndex;
-  pMgmt->replica = pOption->replica;
-  memcpy(&pMgmt->replicas, pOption->replicas, sizeof(SReplica) * TSDB_MAX_REPLICA);
   return 0;
 }
 
 int32_t mmAlter(SMnodeMgmt *pMgmt, SDAlterMnodeReq *pMsg) {
   SMnodeOpt option = {0};
-  if (mmBuildOptionFromReq(pMgmt, &option, pMsg) != 0) {
+  if (mmBuildOptionForAlter(pMgmt, &option, pMsg) != 0) {
     return -1;
   }
 
@@ -97,12 +105,6 @@ int32_t mmAlter(SMnodeMgmt *pMgmt, SDAlterMnodeReq *pMsg) {
     return -1;
   }
 
-  bool deployed = true;
-  if (mmWriteFile(pMgmt, pMsg, deployed) != 0) {
-    dError("failed to write mnode file since %s", terrstr());
-    return -1;
-  }
-
   return 0;
 }
 
@@ -177,7 +179,8 @@ static int32_t mmOpen(SMgmtInputOpt *pInput, SMgmtOutputOpt *pOutput) {
   }
   tmsgReportStartup("mnode-worker", "initialized");
 
-  if (!deployed) {
+  if (!deployed || pMgmt->replica > 0) {
+    pMgmt->replica = 0;
     deployed = true;
     if (mmWriteFile(pMgmt, NULL, deployed) != 0) {
       dError("failed to write mnode file since %s", terrstr());
diff --git a/source/dnode/mgmt/mgmt_mnode/src/mmWorker.c b/source/dnode/mgmt/mgmt_mnode/src/mmWorker.c
index 59d0c491a1..71cc2d2693 100644
--- a/source/dnode/mgmt/mgmt_mnode/src/mmWorker.c
+++ b/source/dnode/mgmt/mgmt_mnode/src/mmWorker.c
@@ -61,6 +61,11 @@ static void mmProcessSyncQueue(SQueueInfo *pInfo, SRpcMsg *pMsg) {
   dTrace("msg:%p, get from mnode-sync queue", pMsg);
 
   pMsg->info.node = pMgmt->pMnode;
+
+  SMsgHead *pHead = pMsg->pCont;
+  pHead->contLen = ntohl(pHead->contLen);
+  pHead->vgId = ntohl(pHead->vgId);
+
   int32_t code = mndProcessSyncMsg(pMsg);
 
   dTrace("msg:%p, is freed, code:0x%x", pMsg, code);
diff --git a/source/dnode/mnode/impl/inc/mndInt.h b/source/dnode/mnode/impl/inc/mndInt.h
index 5a1653b937..a258a369d3 100644
--- a/source/dnode/mnode/impl/inc/mndInt.h
+++ b/source/dnode/mnode/impl/inc/mndInt.h
@@ -76,11 +76,12 @@ typedef struct {
 
 typedef struct {
   SWal      *pWal;
-  int32_t    errCode;
-  bool       restored;
   sem_t      syncSem;
   int64_t    sync;
   ESyncState state;
+  bool       standby;
+  bool       restored;
+  int32_t    errCode;
 } SSyncMgmt;
 
 typedef struct {
diff --git a/source/dnode/mnode/impl/src/mndMnode.c b/source/dnode/mnode/impl/src/mndMnode.c
index 7f86eb8b32..0bb89a1d91 100644
--- a/source/dnode/mnode/impl/src/mndMnode.c
+++ b/source/dnode/mnode/impl/src/mndMnode.c
@@ -39,14 +39,16 @@ static int32_t  mndRetrieveMnodes(SRpcMsg *pReq, SShowObj *pShow, SSDataBlock *p
 static void     mndCancelGetNextMnode(SMnode *pMnode, void *pIter);
 
 int32_t mndInitMnode(SMnode *pMnode) {
-  SSdbTable table = {.sdbType = SDB_MNODE,
-                     .keyType = SDB_KEY_INT32,
-                     .deployFp = (SdbDeployFp)mndCreateDefaultMnode,
-                     .encodeFp = (SdbEncodeFp)mndMnodeActionEncode,
-                     .decodeFp = (SdbDecodeFp)mndMnodeActionDecode,
-                     .insertFp = (SdbInsertFp)mndMnodeActionInsert,
-                     .updateFp = (SdbUpdateFp)mndMnodeActionUpdate,
-                     .deleteFp = (SdbDeleteFp)mndMnodeActionDelete};
+  SSdbTable table = {
+      .sdbType = SDB_MNODE,
+      .keyType = SDB_KEY_INT32,
+      .deployFp = (SdbDeployFp)mndCreateDefaultMnode,
+      .encodeFp = (SdbEncodeFp)mndMnodeActionEncode,
+      .decodeFp = (SdbDecodeFp)mndMnodeActionDecode,
+      .insertFp = (SdbInsertFp)mndMnodeActionInsert,
+      .updateFp = (SdbUpdateFp)mndMnodeActionUpdate,
+      .deleteFp = (SdbDeleteFp)mndMnodeActionDelete,
+  };
 
   mndSetMsgHandle(pMnode, TDMT_MND_CREATE_MNODE, mndProcessCreateMnodeReq);
   mndSetMsgHandle(pMnode, TDMT_MND_DROP_MNODE, mndProcessDropMnodeReq);
diff --git a/source/dnode/mnode/impl/src/mndSync.c b/source/dnode/mnode/impl/src/mndSync.c
index a4e6cfd5ca..3ac7c3713f 100644
--- a/source/dnode/mnode/impl/src/mndSync.c
+++ b/source/dnode/mnode/impl/src/mndSync.c
@@ -17,22 +17,26 @@
 #include "mndSync.h"
 #include "mndTrans.h"
 
-int32_t mndSyncEqMsg(const SMsgCb *msgcb, SRpcMsg *pMsg) { return tmsgPutToQueue(msgcb, SYNC_QUEUE, pMsg); }
+int32_t mndSyncEqMsg(const SMsgCb *msgcb, SRpcMsg *pMsg) { 
+  SMsgHead *pHead = pMsg->pCont;
+  pHead->contLen = htonl(pHead->contLen);
+  pHead->vgId = htonl(pHead->vgId);
+
+  return tmsgPutToQueue(msgcb, SYNC_QUEUE, pMsg); 
+}
 
 int32_t mndSyncSendMsg(const SEpSet *pEpSet, SRpcMsg *pMsg) { return tmsgSendReq(pEpSet, pMsg); }
 
 void mndSyncCommitMsg(struct SSyncFSM *pFsm, const SRpcMsg *pMsg, SFsmCbMeta cbMeta) {
-  SMnode    *pMnode = pFsm->data;
-  SSdb      *pSdb = pMnode->pSdb;
-  SSyncMgmt *pMgmt = &pMnode->syncMgmt;
-  SSdbRaw   *pRaw = pMsg->pCont;
+  SMnode  *pMnode = pFsm->data;
+  SSdbRaw *pRaw = pMsg->pCont;
 
   mTrace("raw:%p, apply to sdb, ver:%" PRId64 " role:%s", pRaw, cbMeta.index, syncStr(cbMeta.state));
-  sdbWriteWithoutFree(pSdb, pRaw);
-  sdbSetApplyIndex(pSdb, cbMeta.index);
-  sdbSetApplyTerm(pSdb, cbMeta.term);
+  sdbWriteWithoutFree(pMnode->pSdb, pRaw);
+  sdbSetApplyIndex(pMnode->pSdb, cbMeta.index);
+  sdbSetApplyTerm(pMnode->pSdb, cbMeta.term);
   if (cbMeta.state == TAOS_SYNC_STATE_LEADER) {
-    tsem_post(&pMgmt->syncSem);
+    tsem_post(&pMnode->syncMgmt.syncSem);
   }
 }
 
@@ -49,15 +53,41 @@ void mndRestoreFinish(struct SSyncFSM *pFsm) {
   pMnode->syncMgmt.restored = true;
 }
 
+void *mndSnapshotRead(struct SSyncFSM *pFsm, const SSnapshot *snapshot, void *iter, char **ppBuf, int32_t *len) {
+  SMnode   *pMnode = pFsm->data;
+  SSdbIter *pIter = iter;
+
+  if (iter == NULL) {
+    pIter = sdbIterInit(pMnode->pSdb);
+  }
+
+  return sdbIterRead(pMnode->pSdb, pIter, ppBuf, len);
+}
+
+int32_t mndSnapshotApply(struct SSyncFSM* pFsm, const SSnapshot* snapshot, char* pBuf, int32_t len) {
+  SMnode *pMnode = pFsm->data;
+  sdbWrite(pMnode->pSdb, (SSdbRaw*)pBuf);
+  return 0;
+}
+  
+void mndReConfig(struct SSyncFSM* pFsm, SSyncCfg newCfg, SReConfigCbMeta cbMeta) {
+
+}
+
 SSyncFSM *mndSyncMakeFsm(SMnode *pMnode) {
   SSyncFSM *pFsm = taosMemoryCalloc(1, sizeof(SSyncFSM));
   pFsm->data = pMnode;
+
   pFsm->FpCommitCb = mndSyncCommitMsg;
   pFsm->FpPreCommitCb = NULL;
   pFsm->FpRollBackCb = NULL;
+
   pFsm->FpGetSnapshot = mndSyncGetSnapshot;
-  pFsm->FpRestoreFinish = mndRestoreFinish;
-  pFsm->FpRestoreSnapshot = NULL;
+  pFsm->FpRestoreFinishCb = mndRestoreFinish;
+  pFsm->FpSnapshotRead = mndSnapshotRead;
+  pFsm->FpSnapshotApply = mndSnapshotApply;
+  pFsm->FpReConfigCb = mndReConfig;
+  
   return pFsm;
 }
 
@@ -90,10 +120,13 @@ int32_t mndInitSync(SMnode *pMnode) {
   SSyncCfg *pCfg = &syncInfo.syncCfg;
   pCfg->replicaNum = pMnode->replica;
   pCfg->myIndex = pMnode->selfIndex;
+  mInfo("start to open mnode sync, replica:%d myindex:%d standby:%d", pCfg->replicaNum, pCfg->myIndex,
+        pMgmt->standby);
   for (int32_t i = 0; i < pMnode->replica; ++i) {
     SNodeInfo *pNode = &pCfg->nodeInfo[i];
     tstrncpy(pNode->nodeFqdn, pMnode->replicas[i].fqdn, sizeof(pNode->nodeFqdn));
     pNode->nodePort = pMnode->replicas[i].port;
+    mInfo("index:%d, fqdn:%s port:%d", i, pNode->nodeFqdn, pNode->nodePort);
   }
 
   tsem_init(&pMgmt->syncSem, 0, 0);
@@ -149,7 +182,11 @@ int32_t mndSyncPropose(SMnode *pMnode, SSdbRaw *pRaw) {
 void mndSyncStart(SMnode *pMnode) {
   SSyncMgmt *pMgmt = &pMnode->syncMgmt;
   syncSetMsgCb(pMgmt->sync, &pMnode->msgCb);
-  syncStart(pMgmt->sync);
+  if (pMgmt->standby) {
+    syncStartStandBy(pMgmt->sync);
+  } else {
+    syncStart(pMgmt->sync);
+  }
   mDebug("sync:%" PRId64 " is started", pMgmt->sync);
 }
 
@@ -161,3 +198,18 @@ bool mndIsMaster(SMnode *pMnode) {
 
   return (pMgmt->state == TAOS_SYNC_STATE_LEADER) && (pMnode->syncMgmt.restored);
 }
+
+int32_t mndAlter(SMnode *pMnode, const SMnodeOpt *pOption) {
+  SSyncCfg cfg = {.replicaNum = pOption->replica, .myIndex = pOption->selfIndex};
+  mInfo("start to alter mnode sync, replica:%d myindex:%d standby:%d", cfg.replicaNum, cfg.myIndex, pOption->standby);
+  for (int32_t i = 0; i < pOption->replica; ++i) {
+    SNodeInfo *pNode = &cfg.nodeInfo[i];
+    tstrncpy(pNode->nodeFqdn, pOption->replicas[i].fqdn, sizeof(pNode->nodeFqdn));
+    pNode->nodePort = pOption->replicas[i].port;
+    mInfo("index:%d, fqdn:%s port:%d", i, pNode->nodeFqdn, pNode->nodePort);
+  }
+
+  SSyncMgmt *pMgmt = &pMnode->syncMgmt;
+  pMgmt->standby = pOption->standby;
+  return syncReconfig(pMgmt->sync, &cfg);
+}
\ No newline at end of file
diff --git a/source/dnode/mnode/impl/src/mnode.c b/source/dnode/mnode/impl/src/mnode.c
index 775c64ceab..572844d8d4 100644
--- a/source/dnode/mnode/impl/src/mnode.c
+++ b/source/dnode/mnode/impl/src/mnode.c
@@ -263,6 +263,7 @@ static void mndSetOptions(SMnode *pMnode, const SMnodeOpt *pOption) {
   memcpy(&pMnode->replicas, pOption->replicas, sizeof(SReplica) * TSDB_MAX_REPLICA);
   pMnode->msgCb = pOption->msgCb;
   pMnode->selfId = pOption->replicas[pOption->selfIndex].id;
+  pMnode->syncMgmt.standby = pOption->standby;
 }
 
 SMnode *mndOpen(const char *path, const SMnodeOpt *pOption) {
@@ -329,12 +330,6 @@ void mndClose(SMnode *pMnode) {
   }
 }
 
-int32_t mndAlter(SMnode *pMnode, const SMnodeOpt *pOption) {
-  mDebug("start to alter mnode");
-  mDebug("mnode is altered");
-  return 0;
-}
-
 int32_t mndStart(SMnode *pMnode) {
   mndSyncStart(pMnode);
   return mndInitTimer(pMnode);
diff --git a/source/dnode/mnode/sdb/src/sdbFile.c b/source/dnode/mnode/sdb/src/sdbFile.c
index b000c208c8..eac7f4af5d 100644
--- a/source/dnode/mnode/sdb/src/sdbFile.c
+++ b/source/dnode/mnode/sdb/src/sdbFile.c
@@ -392,3 +392,66 @@ int32_t sdbDeploy(SSdb *pSdb) {
 
   return 0;
 }
+
+SSdbIter *sdbIterInit(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);
+
+  if (taosCopyFile(datafile, tmpfile) != 0) {
+    terrno = TAOS_SYSTEM_ERROR(errno);
+    mError("failed to copy file %s to %s since %s", datafile, tmpfile, terrstr());
+    return NULL;
+  }
+
+  SSdbIter *pIter = taosMemoryCalloc(1, sizeof(SSdbIter));
+  if (pIter == NULL) {
+    terrno = TSDB_CODE_OUT_OF_MEMORY;
+    return NULL;
+  }
+
+  pIter->file = taosOpenFile(tmpfile, TD_FILE_READ);
+  if (pIter->file == NULL) {
+    terrno = TAOS_SYSTEM_ERROR(errno);
+    mError("failed to read snapshot file:%s since %s", tmpfile, terrstr());
+    taosMemoryFree(pIter);
+    return NULL;
+  }
+
+  mDebug("start to read snapshot file:%s, iter:%p", tmpfile, pIter);
+  return pIter;
+}
+
+SSdbIter *sdbIterRead(SSdb *pSdb, SSdbIter *pIter, char **ppBuf, int32_t *buflen) {
+  const int32_t maxlen = 100;
+
+  char *pBuf = taosMemoryCalloc(1, maxlen);
+  if (pBuf == NULL) {
+    terrno = TSDB_CODE_OUT_OF_MEMORY;
+    return NULL;
+  }
+
+  int32_t readlen = taosReadFile(pIter->file, pBuf, maxlen);
+  if (readlen == 0) {
+    mTrace("read snapshot to the end, readlen:%" PRId64, pIter->readlen);
+    taosMemoryFree(pBuf);
+    taosCloseFile(&pIter->file);
+    taosMemoryFree(pIter);
+    pIter = NULL;
+  } else if (readlen < 0) {
+    terrno = TAOS_SYSTEM_ERROR(errno);
+    mError("failed to read snapshot since %s, readlen:%" PRId64, terrstr(), pIter->readlen);
+    taosMemoryFree(pBuf);
+    taosCloseFile(&pIter->file);
+    taosMemoryFree(pIter);
+    pIter = NULL;
+  } else {
+    pIter->readlen += readlen;
+    mTrace("read snapshot, readlen:%" PRId64, pIter->readlen);
+    *ppBuf = pBuf;
+    *buflen = readlen;
+  }
+
+  return pIter;
+}
diff --git a/source/dnode/vnode/src/vnd/vnodeSync.c b/source/dnode/vnode/src/vnd/vnodeSync.c
index 882ee912cd..d8f3110a16 100644
--- a/source/dnode/vnode/src/vnd/vnodeSync.c
+++ b/source/dnode/vnode/src/vnd/vnodeSync.c
@@ -147,6 +147,10 @@ SSyncFSM *vnodeSyncMakeFsm(SVnode *pVnode) {
   pFsm->FpPreCommitCb = vnodeSyncPreCommitMsg;
   pFsm->FpRollBackCb = vnodeSyncRollBackMsg;
   pFsm->FpGetSnapshot = vnodeSyncGetSnapshot;
-  pFsm->FpRestoreFinish = NULL;
+  pFsm->FpRestoreFinishCb = NULL;
+  pFsm->FpSnapshotRead = NULL;
+  pFsm->FpSnapshotApply = NULL;
+  pFsm->FpReConfigCb = NULL;
+
   return pFsm;
 }
\ No newline at end of file
diff --git a/source/libs/sync/inc/syncInt.h b/source/libs/sync/inc/syncInt.h
index 9246041b81..69549d2a7e 100644
--- a/source/libs/sync/inc/syncInt.h
+++ b/source/libs/sync/inc/syncInt.h
@@ -148,8 +148,8 @@ typedef struct SSyncNode {
   SSyncRespMgr* pSyncRespMgr;
 
   // restore state
-  bool       restoreFinish;
-  //sem_t      restoreSem;
+  bool restoreFinish;
+  // sem_t      restoreSem;
   SSnapshot* pSnapshot;
 
 } SSyncNode;
diff --git a/source/libs/sync/inc/syncVoteMgr.h b/source/libs/sync/inc/syncVoteMgr.h
index 5bc240e921..716d2f620c 100644
--- a/source/libs/sync/inc/syncVoteMgr.h
+++ b/source/libs/sync/inc/syncVoteMgr.h
@@ -42,6 +42,7 @@ typedef struct SVotesGranted {
 
 SVotesGranted *voteGrantedCreate(SSyncNode *pSyncNode);
 void           voteGrantedDestroy(SVotesGranted *pVotesGranted);
+void           voteGrantedUpdate(SVotesGranted *pVotesGranted, SSyncNode *pSyncNode);
 bool           voteGrantedMajority(SVotesGranted *pVotesGranted);
 void           voteGrantedVote(SVotesGranted *pVotesGranted, SyncRequestVoteReply *pMsg);
 void           voteGrantedReset(SVotesGranted *pVotesGranted, SyncTerm term);
@@ -65,6 +66,7 @@ typedef struct SVotesRespond {
 
 SVotesRespond *votesRespondCreate(SSyncNode *pSyncNode);
 void           votesRespondDestory(SVotesRespond *pVotesRespond);
+void           votesRespondUpdate(SVotesRespond *pVotesRespond, SSyncNode *pSyncNode);
 bool           votesResponded(SVotesRespond *pVotesRespond, const SRaftId *pRaftId);
 void           votesRespondAdd(SVotesRespond *pVotesRespond, const SyncRequestVoteReply *pMsg);
 void           votesRespondReset(SVotesRespond *pVotesRespond, SyncTerm term);
diff --git a/source/libs/sync/src/syncAppendEntries.c b/source/libs/sync/src/syncAppendEntries.c
index fa735e71c0..0411628c5c 100644
--- a/source/libs/sync/src/syncAppendEntries.c
+++ b/source/libs/sync/src/syncAppendEntries.c
@@ -362,8 +362,8 @@ int32_t syncNodeOnAppendEntriesCb(SSyncNode* ths, SyncAppendEntries* pMsg) {
               // restore finish
               if (pEntry->index == ths->pLogStore->getLastIndex(ths->pLogStore)) {
                 if (ths->restoreFinish == false) {
-                  if (ths->pFsm->FpRestoreFinish != NULL) {
-                    ths->pFsm->FpRestoreFinish(ths->pFsm);
+                  if (ths->pFsm->FpRestoreFinishCb != NULL) {
+                    ths->pFsm->FpRestoreFinishCb(ths->pFsm);
                   }
                   ths->restoreFinish = true;
                   sInfo("==syncNodeOnAppendEntriesCb== restoreFinish set true %p vgId:%d", ths, ths->vgId);
diff --git a/source/libs/sync/src/syncCommit.c b/source/libs/sync/src/syncCommit.c
index 18c6f8930a..36713ceed5 100644
--- a/source/libs/sync/src/syncCommit.c
+++ b/source/libs/sync/src/syncCommit.c
@@ -139,8 +139,8 @@ void syncMaybeAdvanceCommitIndex(SSyncNode* pSyncNode) {
           // restore finish
           if (pEntry->index == pSyncNode->pLogStore->getLastIndex(pSyncNode->pLogStore)) {
             if (pSyncNode->restoreFinish == false) {
-              if (pSyncNode->pFsm->FpRestoreFinish != NULL) {
-                pSyncNode->pFsm->FpRestoreFinish(pSyncNode->pFsm);
+              if (pSyncNode->pFsm->FpRestoreFinishCb != NULL) {
+                pSyncNode->pFsm->FpRestoreFinishCb(pSyncNode->pFsm);
               }
               pSyncNode->restoreFinish = true;
               sInfo("==syncMaybeAdvanceCommitIndex== restoreFinish set true %p vgId:%d", pSyncNode, pSyncNode->vgId);
diff --git a/source/libs/sync/src/syncMain.c b/source/libs/sync/src/syncMain.c
index a69a94831d..4aca68fa64 100644
--- a/source/libs/sync/src/syncMain.c
+++ b/source/libs/sync/src/syncMain.c
@@ -509,7 +509,7 @@ SSyncNode* syncNodeOpen(const SSyncInfo* pSyncInfo) {
     pSyncNode->pSnapshot = taosMemoryMalloc(sizeof(SSnapshot));
     pSyncNode->pFsm->FpGetSnapshot(pSyncNode->pFsm, pSyncNode->pSnapshot);
   }
-  //tsem_init(&(pSyncNode->restoreSem), 0, 0);
+  // tsem_init(&(pSyncNode->restoreSem), 0, 0);
 
   // start in syncNodeStart
   // start raft
@@ -606,7 +606,7 @@ void syncNodeClose(SSyncNode* pSyncNode) {
     taosMemoryFree(pSyncNode->pSnapshot);
   }
 
-  //tsem_destroy(&pSyncNode->restoreSem);
+  // tsem_destroy(&pSyncNode->restoreSem);
 
   // free memory in syncFreeNode
   // taosMemoryFree(pSyncNode);
@@ -920,6 +920,17 @@ char* syncNode2SimpleStr(const SSyncNode* pSyncNode) {
 }
 
 void syncNodeUpdateConfig(SSyncNode* pSyncNode, SSyncCfg* newConfig) {
+  bool hit = false;
+  for (int i = 0; i < newConfig->replicaNum; ++i) {
+    if (strcmp(pSyncNode->myNodeInfo.nodeFqdn, (newConfig->nodeInfo)[i].nodeFqdn) == 0 &&
+        pSyncNode->myNodeInfo.nodePort == (newConfig->nodeInfo)[i].nodePort) {
+      newConfig->myIndex = i;
+      hit = true;
+      break;
+    }
+  }
+  ASSERT(hit == true);
+
   pSyncNode->pRaftCfg->cfg = *newConfig;
   int32_t ret = raftCfgPersist(pSyncNode->pRaftCfg);
   ASSERT(ret == 0);
@@ -949,6 +960,8 @@ void syncNodeUpdateConfig(SSyncNode* pSyncNode, SSyncCfg* newConfig) {
 
   syncIndexMgrUpdate(pSyncNode->pNextIndex, pSyncNode);
   syncIndexMgrUpdate(pSyncNode->pMatchIndex, pSyncNode);
+  voteGrantedUpdate(pSyncNode->pVotesGranted, pSyncNode);
+  votesRespondUpdate(pSyncNode->pVotesRespond, pSyncNode);
 
   syncNodeLog2("==syncNodeUpdateConfig==", pSyncNode);
 }
diff --git a/source/libs/sync/src/syncVoteMgr.c b/source/libs/sync/src/syncVoteMgr.c
index 733dfd05b6..1c1f0809bd 100644
--- a/source/libs/sync/src/syncVoteMgr.c
+++ b/source/libs/sync/src/syncVoteMgr.c
@@ -45,6 +45,17 @@ void voteGrantedDestroy(SVotesGranted *pVotesGranted) {
   }
 }
 
+void voteGrantedUpdate(SVotesGranted *pVotesGranted, SSyncNode *pSyncNode) {
+  pVotesGranted->replicas = &(pSyncNode->replicasId);
+  pVotesGranted->replicaNum = pSyncNode->replicaNum;
+  voteGrantedClearVotes(pVotesGranted);
+
+  pVotesGranted->term = 0;
+  pVotesGranted->quorum = pSyncNode->quorum;
+  pVotesGranted->toLeader = false;
+  pVotesGranted->pSyncNode = pSyncNode;
+}
+
 bool voteGrantedMajority(SVotesGranted *pVotesGranted) {
   bool ret = pVotesGranted->votes >= pVotesGranted->quorum;
   return ret;
@@ -168,6 +179,13 @@ void votesRespondDestory(SVotesRespond *pVotesRespond) {
   }
 }
 
+void votesRespondUpdate(SVotesRespond *pVotesRespond, SSyncNode *pSyncNode) {
+  pVotesRespond->replicas = &(pSyncNode->replicasId);
+  pVotesRespond->replicaNum = pSyncNode->replicaNum;
+  pVotesRespond->term = 0;
+  pVotesRespond->pSyncNode = pSyncNode;
+}
+
 bool votesResponded(SVotesRespond *pVotesRespond, const SRaftId *pRaftId) {
   bool ret = false;
   for (int i = 0; i < pVotesRespond->replicaNum; ++i) {
diff --git a/source/libs/sync/test/syncConfigChangeTest.cpp b/source/libs/sync/test/syncConfigChangeTest.cpp
index 0850ef6343..f52fef0019 100644
--- a/source/libs/sync/test/syncConfigChangeTest.cpp
+++ b/source/libs/sync/test/syncConfigChangeTest.cpp
@@ -73,9 +73,7 @@ int32_t GetSnapshotCb(struct SSyncFSM* pFsm, SSnapshot* pSnapshot) {
   return 0;
 }
 
-void FpRestoreFinishCb(struct SSyncFSM* pFsm) {
-  sTrace("==callback== ==FpRestoreFinishCb==");
-}
+void RestoreFinishCb(struct SSyncFSM* pFsm) { sTrace("==callback== ==RestoreFinishCb=="); }
 
 SSyncFSM* createFsm() {
   SSyncFSM* pFsm = (SSyncFSM*)taosMemoryMalloc(sizeof(SSyncFSM));
@@ -83,7 +81,7 @@ SSyncFSM* createFsm() {
   pFsm->FpPreCommitCb = PreCommitCb;
   pFsm->FpRollBackCb = RollBackCb;
   pFsm->FpGetSnapshot = GetSnapshotCb;
-  pFsm->FpRestoreFinish = FpRestoreFinishCb;
+  pFsm->FpRestoreFinishCb = RestoreFinishCb;
   return pFsm;
 }
 
diff --git a/tests/script/jenkins/basic.txt b/tests/script/jenkins/basic.txt
index 6ecc816442..7aaf1e1eca 100644
--- a/tests/script/jenkins/basic.txt
+++ b/tests/script/jenkins/basic.txt
@@ -55,7 +55,8 @@
 ./test.sh -f tsim/bnode/basic1.sim
 
 # ---- mnode
-./test.sh -f tsim/mnode/basic1.sim
+#./test.sh -f tsim/mnode/basic1.sim
+./test.sh -f tsim/mnode/basic2.sim
 
 # ---- show
 ./test.sh -f tsim/show/basic.sim
@@ -106,7 +107,7 @@
 ./test.sh -f tsim/tmq/basic3.sim -m
 ./test.sh -f tsim/stable/vnode3.sim -m
 ./test.sh -f tsim/qnode/basic1.sim -m
-./test.sh -f tsim/mnode/basic1.sim -m
+#./test.sh -f tsim/mnode/basic1.sim -m
 
 # --- sma
 ./test.sh -f tsim/sma/tsmaCreateInsertData.sim
diff --git a/tests/script/sh/deploy.sh b/tests/script/sh/deploy.sh
index da295f640e..5edc0a4d3e 100755
--- a/tests/script/sh/deploy.sh
+++ b/tests/script/sh/deploy.sh
@@ -136,7 +136,7 @@ echo "qDebugFlag             143"                >> $TAOS_CFG
 echo "rpcDebugFlag           143"                >> $TAOS_CFG
 echo "tmrDebugFlag           131"                >> $TAOS_CFG
 echo "uDebugFlag             143"                >> $TAOS_CFG
-echo "sDebugFlag             135"                >> $TAOS_CFG
+echo "sDebugFlag             143"                >> $TAOS_CFG
 echo "wDebugFlag             143"                >> $TAOS_CFG
 echo "numOfLogLines          20000000"           >> $TAOS_CFG
 echo "statusInterval         1"                  >> $TAOS_CFG
diff --git a/tests/script/tsim/mnode/basic2.sim b/tests/script/tsim/mnode/basic2.sim
new file mode 100644
index 0000000000..53dea6821e
--- /dev/null
+++ b/tests/script/tsim/mnode/basic2.sim
@@ -0,0 +1,84 @@
+system sh/stop_dnodes.sh
+system sh/deploy.sh -n dnode1 -i 1
+system sh/deploy.sh -n dnode2 -i 2
+system sh/exec.sh -n dnode1 -s start
+system sh/exec.sh -n dnode2 -s start
+sql connect
+
+print =============== show dnodes
+sql show dnodes;
+if $rows != 1 then 
+  return -1
+endi
+
+if $data00 != 1 then 
+  return -1
+endi
+
+sql show mnodes;
+if $rows != 1 then 
+  return -1
+endi
+
+if $data00 != 1 then 
+  return -1
+endi
+
+if $data02 != LEADER then 
+  return -1
+endi
+
+print =============== create dnodes
+sql create dnode $hostname port 7200
+sleep 2000
+
+sql show dnodes;
+if $rows != 2 then 
+  return -1
+endi
+
+if $data00 != 1 then 
+  return -1
+endi
+
+if $data10 != 2 then 
+  return -1
+endi
+
+print $data02
+if $data02 != 0 then 
+  return -1
+endi
+
+if $data12 != 0 then 
+  return -1
+endi
+
+if $data04 != ready then 
+  return -1
+endi
+
+if $data14 != ready then 
+  return -1
+endi
+
+sql show mnodes;
+if $rows != 1 then 
+  return -1
+endi
+
+if $data00 != 1 then 
+  return -1
+endi
+
+if $data02 != LEADER then 
+  return -1
+endi
+
+print =============== create mnode 2
+sql create mnode on dnode 2
+sql show mnodes
+if $rows != 2 then 
+  return -1
+endi
+