diff --git a/include/libs/sync/sync.h b/include/libs/sync/sync.h
index e8a8dee866507b550a9e010c516dce52709e3b2d..9ffd74c229d89e3eed2e9075c63a3b1077a5be3e 100644
--- a/include/libs/sync/sync.h
+++ b/include/libs/sync/sync.h
@@ -46,14 +46,14 @@ typedef struct {
 } SNodeInfo;
 
 typedef struct {
-  int       selfIndex;
-  int       replica;
+  int32_t   selfIndex;
+  int32_t   replica;
   SNodeInfo nodeInfo[TSDB_MAX_REPLICA];
 } SSyncCluster;
 
 typedef struct {
   int32_t   selfIndex;
-  int       replica;
+  int32_t   replica;
   SNodeInfo node[TSDB_MAX_REPLICA];
   ESyncRole role[TSDB_MAX_REPLICA];
 } SNodesRole;
@@ -62,20 +62,20 @@ typedef struct SSyncFSM {
   void* pData;
 
   // apply committed log, bufs will be free by raft module
-  int (*applyLog)(struct SSyncFSM* fsm, SyncIndex index, const SSyncBuffer* buf, void* pData);
+  int32_t (*applyLog)(struct SSyncFSM* fsm, SyncIndex index, const SSyncBuffer* buf, void* pData);
 
   // cluster commit callback
-  int (*onClusterChanged)(struct SSyncFSM* fsm, const SSyncCluster* cluster, void* pData);
+  int32_t (*onClusterChanged)(struct SSyncFSM* fsm, const SSyncCluster* cluster, void* pData);
 
   // fsm return snapshot in ppBuf, bufs will be free by raft module
   // TODO: getSnapshot SHOULD be async?
-  int (*getSnapshot)(struct SSyncFSM* fsm, SSyncBuffer** ppBuf, int* objId, bool* isLast);
+  int32_t (*getSnapshot)(struct SSyncFSM* fsm, SSyncBuffer** ppBuf, int32_t* objId, bool* isLast);
 
   // fsm apply snapshot with pBuf data
-  int (*applySnapshot)(struct SSyncFSM* fsm, SSyncBuffer* pBuf, int objId, bool isLast);
+  int32_t (*applySnapshot)(struct SSyncFSM* fsm, SSyncBuffer* pBuf, int32_t objId, bool isLast);
 
   // call when restore snapshot and log done
-  int (*onRestoreDone)(struct SSyncFSM* fsm);
+  int32_t (*onRestoreDone)(struct SSyncFSM* fsm);
 
   void (*onRollback)(struct SSyncFSM* fsm, SyncIndex index, const SSyncBuffer* buf);
 
@@ -118,9 +118,9 @@ typedef struct SSyncClusterConfig {
 typedef struct SStateManager {
   void* pData;
 
-  void (*saveServerState)(struct SStateManager* stateMng, const SSyncServerState* state);
+  int32_t (*saveServerState)(struct SStateManager* stateMng, SSyncServerState* state);
 
-  const SSyncServerState* (*readServerState)(struct SStateManager* stateMng);
+  int32_t (*readServerState)(struct SStateManager* stateMng, SSyncServerState* state);
 
   // void (*saveCluster)(struct SStateManager* stateMng, const SSyncClusterConfig* cluster);
 
@@ -148,9 +148,9 @@ void       syncStop(const SSyncNode*);
 
 int32_t syncPropose(SSyncNode* syncNode, SSyncBuffer buffer, void* pData, bool isWeak);
 
-//int32_t syncAddNode(SSyncNode syncNode, const SNodeInfo *pNode);
+// int32_t syncAddNode(SSyncNode syncNode, const SNodeInfo *pNode);
 
-//int32_t syncRemoveNode(SSyncNode syncNode, const SNodeInfo *pNode);
+// int32_t syncRemoveNode(SSyncNode syncNode, const SNodeInfo *pNode);
 
 extern int32_t syncDebugFlag;
 
diff --git a/include/libs/wal/wal.h b/include/libs/wal/wal.h
index 9a3310922d210c36751510476c529c3a0c2691aa..143bdf07106aaa4c51f57278440d902f36f87676 100644
--- a/include/libs/wal/wal.h
+++ b/include/libs/wal/wal.h
@@ -44,41 +44,41 @@ typedef struct {
   EWalType walLevel;     // wal level
 } SWalCfg;
 
-typedef void *  twalh;  // WAL HANDLE
-typedef int32_t FWalWrite(void *ahandle, void *pHead, int32_t qtype, void *pMsg);
+struct SWal;
+typedef struct SWal SWal;  // WAL HANDLE
+typedef int32_t (*FWalWrite)(void *ahandle, void *pHead, int32_t qtype, void *pMsg);
 
-//module initialization
-int32_t  walInit();
-void     walCleanUp();
+// module initialization
+int32_t walInit();
+void    walCleanUp();
 
-//handle open and ctl
-twalh    walOpen(char *path, SWalCfg *pCfg);
-int32_t  walAlter(twalh, SWalCfg *pCfg);
-void     walStop(twalh);
-void     walClose(twalh);
+// handle open and ctl
+SWal   *walOpen(char *path, SWalCfg *pCfg);
+int32_t walAlter(SWal *, SWalCfg *pCfg);
+void    walClose(SWal *);
 
-//write
-//int64_t  walWriteWithMsgType(twalh, int8_t msgType, void* body, int32_t bodyLen);
-int64_t  walWrite(twalh, void* body, int32_t bodyLen);
-int64_t  walWriteBatch(twalh, void** bodies, int32_t* bodyLen, int32_t batchSize);
+// write
+// int64_t  walWriteWithMsgType(SWal*, int8_t msgType, void* body, int32_t bodyLen);
+int64_t walWrite(SWal *, int64_t index, void *body, int32_t bodyLen);
+int64_t walWriteBatch(SWal *, void **bodies, int32_t *bodyLen, int32_t batchSize);
 
-//apis for lifecycle management
-void     walFsync(twalh, bool force);
-int32_t  walCommit(twalh, int64_t ver);
-//truncate after
-int32_t  walRollback(twalh, int64_t ver);
-//notify that previous log can be pruned safely
-int32_t  walPrune(twalh, int64_t ver);
+// apis for lifecycle management
+void    walFsync(SWal *, bool force);
+int32_t walCommit(SWal *, int64_t ver);
+// truncate after
+int32_t walRollback(SWal *, int64_t ver);
+// notify that previous log can be pruned safely
+int32_t walPrune(SWal *, int64_t ver);
 
-//read
-int32_t  walRead(twalh, SWalHead **, int64_t ver);
-int32_t  walReadWithFp(twalh, FWalWrite writeFp, int64_t verStart, int readNum);
+// read
+int32_t walRead(SWal *, SWalHead **, int64_t ver);
+int32_t walReadWithFp(SWal *, FWalWrite writeFp, int64_t verStart, int32_t readNum);
 
-//lifecycle check
-int32_t  walFirstVer(twalh);
-int32_t  walPersistedVer(twalh);
-int32_t  walLastVer(twalh);
-//int32_t  walDataCorrupted(twalh);
+// lifecycle check
+int32_t walFirstVer(SWal *);
+int32_t walPersistedVer(SWal *);
+int32_t walLastVer(SWal *);
+// int32_t  walDataCorrupted(SWal*);
 
 #ifdef __cplusplus
 }
diff --git a/source/libs/wal/src/wal.c b/source/libs/wal/src/wal.c
index 8c0fc2b775497c5f1588eb2fa34db7f4eedd00ff..9331cce20ba5391198677b7e76358309677d6c6b 100644
--- a/source/libs/wal/src/wal.c
+++ b/source/libs/wal/src/wal.c
@@ -19,6 +19,18 @@ int32_t walInit() { return 0; }
 
 void walCleanUp() {}
 
-twalh walOpen(char *path, SWalCfg *pCfg) { return NULL; }
+SWal *walOpen(char *path, SWalCfg *pCfg) { return NULL; }
 
-int32_t walAlter(twalh pWal, SWalCfg *pCfg) { return 0; }
\ No newline at end of file
+int32_t walAlter(SWal *pWal, SWalCfg *pCfg) { return 0; }
+
+void walClose(SWal *pWal) {}
+
+void walFsync(SWal *pWal, bool force) {}
+
+int64_t walWrite(SWal *pWal, int64_t index, void *body, int32_t bodyLen) {}
+
+int32_t walCommit(SWal *pWal, int64_t ver) { return 0; }
+
+int32_t walRollback(SWal *pWal, int64_t ver) { return 0; }
+
+int32_t walPrune(SWal *pWal, int64_t ver) { return 0; }
\ No newline at end of file
diff --git a/source/server/vnode/inc/vnodeFile.h b/source/server/vnode/inc/vnodeFile.h
index 31364d8c03471c703891432c92318b7ea0de61c0..bea28324eed9264cfc20985743ea76a9cbb00099 100644
--- a/source/server/vnode/inc/vnodeFile.h
+++ b/source/server/vnode/inc/vnodeFile.h
@@ -23,8 +23,8 @@ extern "C" {
 
 int32_t vnodeReadCfg(int32_t vgId, SVnodeCfg *pCfg);
 int32_t vnodeWriteCfg(int32_t vgId, SVnodeCfg *pCfg);
-int32_t vnodeReadTerm(int32_t vgId, SSyncServerState *pState);
-int32_t vnodeWriteTerm(int32_t vgid, SSyncServerState *pState);
+int32_t vnodeReadState(int32_t vgId, SSyncServerState *pState);
+int32_t vnodeSaveState(int32_t vgid, SSyncServerState *pState);
 
 #ifdef __cplusplus
 }
diff --git a/source/server/vnode/inc/vnodeInt.h b/source/server/vnode/inc/vnodeInt.h
index ac6c77041f42f2dda3b5f4898a18a67136183aa5..90d9e7105e135e2659abb2e8887656dee83f654c 100644
--- a/source/server/vnode/inc/vnodeInt.h
+++ b/source/server/vnode/inc/vnodeInt.h
@@ -79,7 +79,7 @@ typedef struct {
   SMeta           *pMeta;
   STsdb           *pTsdb;
   STQ             *pTQ;
-  twalh            pWal;
+  SWal            *pWal;
   void            *pQuery;
   SSyncNode       *pSync;
   taos_queue       pWriteQ;  // write queue
diff --git a/source/server/vnode/src/vnodeFile.c b/source/server/vnode/src/vnodeFile.c
index a77c99ec3442da097c1ec5abe641a6773eeda12e..ddcbd2689df91fbcc224e667e785ae2be643e01f 100644
--- a/source/server/vnode/src/vnodeFile.c
+++ b/source/server/vnode/src/vnodeFile.c
@@ -296,7 +296,7 @@ int32_t vnodeWriteCfg(int32_t vgId, SVnodeCfg *pCfg) {
   return TSDB_CODE_SUCCESS;
 }
 
-int32_t vnodeReadTerm(int32_t vgId, SSyncServerState *pState) {
+int32_t vnodeReadState(int32_t vgId, SSyncServerState *pState) {
   int32_t ret = TSDB_CODE_VND_APP_ERROR;
   int32_t len = 0;
   int32_t maxLen = 100;
@@ -305,7 +305,7 @@ int32_t vnodeReadTerm(int32_t vgId, SSyncServerState *pState) {
   FILE   *fp = NULL;
 
   char file[PATH_MAX + 30] = {0};
-  sprintf(file, "%s/vnode%d/term.json", tsVnodeDir, vgId);
+  sprintf(file, "%s/vnode%d/state.json", tsVnodeDir, vgId);
 
   len = (int32_t)fread(content, 1, maxLen, fp);
   if (len <= 0) {
@@ -343,9 +343,9 @@ PARSE_TERM_ERROR:
   return ret;
 }
 
-int32_t vnodeWriteTerm(int32_t vgId, SSyncServerState *pState) {
+int32_t vnodeSaveState(int32_t vgId, SSyncServerState *pState) {
   char file[PATH_MAX + 30] = {0};
-  sprintf(file, "%s/vnode%d/term.json", tsVnodeDir, vgId);
+  sprintf(file, "%s/vnode%d/state.json", tsVnodeDir, vgId);
 
   FILE *fp = fopen(file, "w");
   if (!fp) {
diff --git a/source/server/vnode/src/vnodeMain.c b/source/server/vnode/src/vnodeMain.c
index c08ae7708a1a5b7179879d6830d7550528aae6d5..ced93ea6a7c0f0a84f9edb8c8450aa30347a1863 100644
--- a/source/server/vnode/src/vnodeMain.c
+++ b/source/server/vnode/src/vnodeMain.c
@@ -130,7 +130,8 @@ static void vnodeDestroyVnode(SVnode *pVnode) {
   }
 
   if (pVnode->pWal) {
-    // todo
+    walClose(pVnode->pWal);
+    pVnode->pWal = NULL;
   }
 
   if (pVnode->allocator) {
@@ -166,6 +167,56 @@ static void vnodeCleanupVnode(SVnode *pVnode) {
   vnodeRelease(pVnode);
 }
 
+static inline int32_t vnodeLogWrite(struct SSyncLogStore *logStore, SyncIndex index, SSyncBuffer *pBuf) {
+  SVnode *pVnode = logStore->pData;  // vnode status can be checked here
+  return walWrite(pVnode->pWal, index, pBuf->data, (int32_t)pBuf->len);
+}
+
+static inline int32_t vnodeLogCommit(struct SSyncLogStore *logStore, SyncIndex index) {
+  SVnode *pVnode = logStore->pData;  // vnode status can be checked here
+  return walCommit(pVnode->pWal, index);
+}
+
+static inline int32_t vnodeLogPrune(struct SSyncLogStore *logStore, SyncIndex index) {
+  SVnode *pVnode = logStore->pData;  // vnode status can be checked here
+  return walPrune(pVnode->pWal, index);
+}
+
+static inline int32_t vnodeLogRollback(struct SSyncLogStore *logStore, SyncIndex index) {
+  SVnode *pVnode = logStore->pData;  // vnode status can be checked here
+  return walRollback(pVnode->pWal, index);
+}
+
+static inline int32_t vnodeSaveServerState(struct SStateManager *stateMng, SSyncServerState *pState) {
+  SVnode *pVnode = stateMng->pData;
+  return vnodeSaveState(pVnode->vgId, pState);
+}
+
+static inline int32_t vnodeReadServerState(struct SStateManager *stateMng, SSyncServerState *pState) {
+  SVnode *pVnode = stateMng->pData;
+  return vnodeSaveState(pVnode->vgId, pState);
+}
+
+static inline int32_t vnodeApplyLog(struct SSyncFSM *fsm, SyncIndex index, const SSyncBuffer *buf, void *pData) {
+  return 0;
+}
+
+static inline int32_t vnodeOnClusterChanged(struct SSyncFSM *fsm, const SSyncCluster *cluster, void *pData) { return 0; }
+
+static inline int32_t vnodeGetSnapshot(struct SSyncFSM *fsm, SSyncBuffer **ppBuf, int32_t *objId, bool *isLast) {
+  return 0;
+}
+
+static inline int32_t vnodeApplySnapshot(struct SSyncFSM *fsm, SSyncBuffer *pBuf, int32_t objId, bool isLast) {
+  return 0;
+}
+
+static inline int32_t vnodeOnRestoreDone(struct SSyncFSM *fsm) { return 0; }
+
+static inline void vnodeOnRollback(struct SSyncFSM *fsm, SyncIndex index, const SSyncBuffer *buf) {}
+
+static inline void vnodeOnRoleChanged(struct SSyncFSM *fsm, const SNodesRole *pRole) {}
+
 static int32_t vnodeOpenVnode(int32_t vgId) {
   int32_t code = 0;
 
@@ -193,7 +244,7 @@ static int32_t vnodeOpenVnode(int32_t vgId) {
     return 0;
   }
 
-  code = vnodeReadTerm(vgId, &pVnode->term);
+  code = vnodeSaveState(vgId, &pVnode->term);
   if (code != TSDB_CODE_SUCCESS) {
     vError("vgId:%d, failed to read term file since %s", pVnode->vgId, tstrerror(code));
     pVnode->cfg.dropped = 1;
@@ -220,25 +271,24 @@ static int32_t vnodeOpenVnode(int32_t vgId) {
   // create sync node
   SSyncInfo syncInfo = {0};
   syncInfo.vgId = vgId;
-  syncInfo.snapshotIndex = 0;      // todo, from tsdb
+  syncInfo.snapshotIndex = 0;  // todo, from tsdb
   memcpy(&syncInfo.syncCfg, &pVnode->cfg.sync, sizeof(SSyncCluster));
   syncInfo.fsm.pData = pVnode;
-  syncInfo.fsm.applyLog = NULL;
-  syncInfo.fsm.onClusterChanged = NULL;
-  syncInfo.fsm.getSnapshot = NULL;
-  syncInfo.fsm.applySnapshot = NULL;
-  syncInfo.fsm.onRestoreDone = NULL;
-  syncInfo.fsm.onRollback = NULL;
+  syncInfo.fsm.applyLog = vnodeApplyLog;
+  syncInfo.fsm.onClusterChanged = vnodeOnClusterChanged;
+  syncInfo.fsm.getSnapshot = vnodeGetSnapshot;
+  syncInfo.fsm.applySnapshot = vnodeApplySnapshot;
+  syncInfo.fsm.onRestoreDone = vnodeOnRestoreDone;
+  syncInfo.fsm.onRollback = vnodeOnRollback;
+  syncInfo.fsm.onRoleChanged = vnodeOnRoleChanged;
   syncInfo.logStore.pData = pVnode;
-  syncInfo.logStore.logWrite = NULL;
-  syncInfo.logStore.logCommit = NULL;
-  syncInfo.logStore.logPrune = NULL;
-  syncInfo.logStore.logRollback = NULL;
+  syncInfo.logStore.logWrite = vnodeLogWrite;
+  syncInfo.logStore.logCommit = vnodeLogCommit;
+  syncInfo.logStore.logPrune = vnodeLogPrune;
+  syncInfo.logStore.logRollback = vnodeLogRollback;
   syncInfo.stateManager.pData = pVnode;
-  syncInfo.stateManager.saveServerState = NULL;
-  syncInfo.stateManager.readServerState = NULL;
-  // syncInfo.stateManager.saveCluster = NULL;
-  // syncInfo.stateManager.readCluster = NULL;
+  syncInfo.stateManager.saveServerState = vnodeSaveServerState;
+  syncInfo.stateManager.readServerState = vnodeReadServerState;
 
   pVnode->pSync = syncStart(&syncInfo);
   if (pVnode->pSync == NULL) {