diff --git a/include/libs/sync/sync.h b/include/libs/sync/sync.h
index 95ee2ca2bc8fa6907ea3b03679ad4d9ef57142ab..1a94dcf42668edea01f86ad55ae9ab0fb27d5241 100644
--- a/include/libs/sync/sync.h
+++ b/include/libs/sync/sync.h
@@ -200,10 +200,10 @@ typedef struct SSyncInfo {
 
 int32_t     syncInit();
 void        syncCleanUp();
+bool        syncIsInit();
 int64_t     syncOpen(SSyncInfo* pSyncInfo);
 void        syncStart(int64_t rid);
 void        syncStop(int64_t rid);
-int32_t     syncSetStandby(int64_t rid);
 ESyncState  syncGetMyRole(int64_t rid);
 bool        syncIsReady(int64_t rid);
 const char* syncGetMyRoleStr(int64_t rid);
@@ -216,7 +216,6 @@ void        syncGetEpSet(int64_t rid, SEpSet* pEpSet);
 void        syncGetRetryEpSet(int64_t rid, SEpSet* pEpSet);
 int32_t     syncPropose(int64_t rid, SRpcMsg* pMsg, bool isWeak);
 // int32_t     syncProposeBatch(int64_t rid, SRpcMsg** pMsgPArr, bool* pIsWeakArr, int32_t arrSize);
-bool        syncEnvIsStart();
 const char* syncStr(ESyncState state);
 bool        syncIsRestoreFinish(int64_t rid);
 int32_t     syncGetSnapshotByIndex(int64_t rid, SyncIndex index, SSnapshot* pSnapshot);
@@ -234,6 +233,9 @@ int32_t syncEndSnapshot(int64_t rid);
 
 int32_t syncStepDown(int64_t rid, SyncTerm newTerm);
 
+SSyncNode* syncNodeAcquire(int64_t rid);
+void       syncNodeRelease(SSyncNode* pNode);
+
 #ifdef __cplusplus
 }
 #endif
diff --git a/include/libs/sync/syncTools.h b/include/libs/sync/syncTools.h
index a1cff2b73832bc1aa6a00f920e4e30a0f7835060..9cb8a9d564b564526e6cb764bba4f083460cb3da 100644
--- a/include/libs/sync/syncTools.h
+++ b/include/libs/sync/syncTools.h
@@ -28,10 +28,6 @@ typedef struct SRaftId {
   SyncGroupId vgId;
 } SRaftId;
 
-// ------------------ control -------------------
-SSyncNode* syncNodeAcquire(int64_t rid);
-void       syncNodeRelease(SSyncNode* pNode);
-
 int32_t syncGetRespRpc(int64_t rid, uint64_t index, SRpcMsg* msg);
 int32_t syncGetAndDelRespRpc(int64_t rid, uint64_t index, SRpcHandleInfo* pInfo);
 void    syncSetMsgCb(int64_t rid, const SMsgCb* msgcb);
diff --git a/include/util/tref.h b/include/util/tref.h
index c2cc54cb07ac3167941061b475f8811e460a3b91..c4b2ec8fa72b1ec58456f76a20f5ac7757e014f7 100644
--- a/include/util/tref.h
+++ b/include/util/tref.h
@@ -25,7 +25,8 @@ extern "C" {
 
 // open a reference set, max is the mod used by hash, fp is the pointer to free resource function
 // return rsetId which will be used by other APIs. On error, -1 is returned, and terrno is set appropriately
-int32_t taosOpenRef(int32_t max, void (*fp)(void *));
+typedef void (*RefFp)(void *);
+int32_t taosOpenRef(int32_t max, RefFp fp);
 
 // close the reference set, refId is the return value by taosOpenRef
 // return 0 if success. On error, -1 is returned, and terrno is set appropriately
diff --git a/source/dnode/mnode/impl/src/mndMain.c b/source/dnode/mnode/impl/src/mndMain.c
index 98a24286f61711e9d9835dff0cb3c5f969ca79eb..53e7b1cd26c385eb1d4e9303cf6db98a940dbc3f 100644
--- a/source/dnode/mnode/impl/src/mndMain.c
+++ b/source/dnode/mnode/impl/src/mndMain.c
@@ -481,7 +481,7 @@ int32_t mndProcessSyncCtrlMsg(SRpcMsg *pMsg) {
 
   mInfo("vgId:%d, process sync ctrl msg", 1);
 
-  if (!syncEnvIsStart()) {
+  if (!syncIsInit()) {
     mError("failed to process sync msg:%p type:%s since syncEnv stop", pMsg, TMSG_INFO(pMsg->msgType));
     terrno = TSDB_CODE_SYN_INTERNAL_ERROR;
     return -1;
@@ -518,7 +518,7 @@ int32_t mndProcessSyncMsg(SRpcMsg *pMsg) {
   SSyncMgmt *pMgmt = &pMnode->syncMgmt;
   int32_t    code = 0;
 
-  if (!syncEnvIsStart()) {
+  if (!syncIsInit()) {
     mError("failed to process sync msg:%p type:%s since syncEnv stop", pMsg, TMSG_INFO(pMsg->msgType));
     terrno = TSDB_CODE_SYN_INTERNAL_ERROR;
     return -1;
@@ -581,11 +581,6 @@ int32_t mndProcessSyncMsg(SRpcMsg *pMsg) {
     code = syncNodeOnSnapshotReply(pSyncNode, pSyncMsg);
     syncSnapshotRspDestroy(pSyncMsg);
 
-  } else if (pMsg->msgType == TDMT_SYNC_SET_MNODE_STANDBY) {
-    code = syncSetStandby(pMgmt->sync);
-    SRpcMsg rsp = {.code = code, .info = pMsg->info};
-    tmsgSendRsp(&rsp);
-
   } else if (pMsg->msgType == TDMT_SYNC_LOCAL_CMD) {
     SyncLocalCmd *pSyncMsg = syncLocalCmdFromRpcMsg2(pMsg);
     code = syncNodeOnLocalCmd(pSyncNode, pSyncMsg);
diff --git a/source/dnode/vnode/src/vnd/vnodeSync.c b/source/dnode/vnode/src/vnd/vnodeSync.c
index bf665fd6db32f7ebd2a82b97bc7a556b41c05bb2..339be16c91064872455b303bd555deb5b6ef0414 100644
--- a/source/dnode/vnode/src/vnd/vnodeSync.c
+++ b/source/dnode/vnode/src/vnd/vnodeSync.c
@@ -234,7 +234,7 @@ int32_t vnodeProcessSyncCtrlMsg(SVnode *pVnode, SRpcMsg *pMsg, SRpcMsg **pRsp) {
   int32_t         code = 0;
   const STraceId *trace = &pMsg->info.traceId;
 
-  if (!syncEnvIsStart()) {
+  if (!syncIsInit()) {
     vGError("vgId:%d, msg:%p failed to process since sync env not start", pVnode->config.vgId, pMsg);
     terrno = TSDB_CODE_APP_ERROR;
     return -1;
@@ -277,7 +277,7 @@ int32_t vnodeProcessSyncMsg(SVnode *pVnode, SRpcMsg *pMsg, SRpcMsg **pRsp) {
   int32_t         code = 0;
   const STraceId *trace = &pMsg->info.traceId;
 
-  if (!syncEnvIsStart()) {
+  if (!syncIsInit()) {
     vGError("vgId:%d, msg:%p failed to process since sync env not start", pVnode->config.vgId, pMsg);
     terrno = TSDB_CODE_APP_ERROR;
     return -1;
diff --git a/source/libs/sync/inc/syncEnv.h b/source/libs/sync/inc/syncEnv.h
index 06da0eb3dfe8066ae52372763e765530a393fc66..068ccaf02906f7dee16e869542c803d65b4c99a0 100644
--- a/source/libs/sync/inc/syncEnv.h
+++ b/source/libs/sync/inc/syncEnv.h
@@ -20,13 +20,7 @@
 extern "C" {
 #endif
 
-#include <stdint.h>
-#include <stdio.h>
-#include <stdlib.h>
 #include "syncInt.h"
-#include "taosdef.h"
-#include "trpc.h"
-#include "ttimer.h"
 
 #define TIMER_MAX_MS         0x7FFFFFFF
 #define ENV_TICK_TIMER_MS    1000
@@ -57,12 +51,12 @@ typedef struct SSyncEnv {
 
 } SSyncEnv;
 
-extern SSyncEnv* gSyncEnv;
+SSyncEnv* syncEnv();
 
-int32_t syncEnvStart();
-int32_t syncEnvStop();
-int32_t syncEnvStartTimer();
-int32_t syncEnvStopTimer();
+int64_t    syncNodeAdd(SSyncNode* pNode);
+void       syncNodeRemove(SSyncNode* pNode);
+SSyncNode* syncNodeAcquire(int64_t rid);
+void       syncNodeRelease(SSyncNode* pNode);
 
 #ifdef __cplusplus
 }
diff --git a/source/libs/sync/inc/syncInt.h b/source/libs/sync/inc/syncInt.h
index f4949e1016b18336faa302b065e04aab20689185..843dee134272350ff0c83297d0484390e536de2d 100644
--- a/source/libs/sync/inc/syncInt.h
+++ b/source/libs/sync/inc/syncInt.h
@@ -24,6 +24,8 @@ extern "C" {
 #include "syncTools.h"
 #include "tlog.h"
 #include "ttimer.h"
+#include "taosdef.h"
+#include "ttimer.h"
 
 // clang-format off
 #define sFatal(...) do { if (sDebugFlag & DEBUG_FATAL) { taosPrintLog("SYN FATAL ", DEBUG_FATAL, 255, __VA_ARGS__); }}     while(0)
@@ -255,9 +257,6 @@ void      syncNodeDoConfigChange(SSyncNode* pSyncNode, SSyncCfg* newConfig, Sync
 SyncIndex syncMinMatchIndex(SSyncNode* pSyncNode);
 char*     syncNodePeerState2Str(const SSyncNode* pSyncNode);
 
-SSyncNode* syncNodeAcquire(int64_t rid);
-void       syncNodeRelease(SSyncNode* pNode);
-
 // raft state change --------------
 void syncNodeUpdateTerm(SSyncNode* pSyncNode, SyncTerm term);
 void syncNodeUpdateTermWithoutStepDown(SSyncNode* pSyncNode, SyncTerm term);
@@ -302,9 +301,6 @@ bool syncNodeNeedSendAppendEntries(SSyncNode* ths, const SRaftId* pDestId, const
 int32_t syncGetSnapshotMeta(int64_t rid, struct SSnapshotMeta* sMeta);
 int32_t syncGetSnapshotMetaByIndex(int64_t rid, SyncIndex snapshotIndex, struct SSnapshotMeta* sMeta);
 
-void syncStartNormal(int64_t rid);
-void syncStartStandBy(int64_t rid);
-
 bool syncNodeCanChange(SSyncNode* pSyncNode);
 bool syncNodeCheckNewConfig(SSyncNode* pSyncNode, const SSyncCfg* pNewCfg);
 
diff --git a/source/libs/sync/src/syncEnv.c b/source/libs/sync/src/syncEnv.c
index fb0bfb8bef318c2f8d2d53f12cfabcfa4fb30ef2..4d4cb8ab69e2b046aaf5db78b6c2d04daf1de10c 100644
--- a/source/libs/sync/src/syncEnv.c
+++ b/source/libs/sync/src/syncEnv.c
@@ -13,118 +13,114 @@
  * along with this program. If not, see <http://www.gnu.org/licenses/>.
  */
 
+#define _DEFAULT_SOURCE
 #include "syncEnv.h"
-// #include <ASSERT.h>
+#include "tref.h"
 
-SSyncEnv *gSyncEnv = NULL;
+static SSyncEnv gSyncEnv = {0};
+static int32_t  gNodeRefId = -1;
+bool            gRaftDetailLog = false;
+static void     syncEnvTick(void *param, void *tmrId);
 
-// local function -----------------
-static SSyncEnv *doSyncEnvStart();
-static int32_t   doSyncEnvStop(SSyncEnv *pSyncEnv);
-static int32_t   doSyncEnvStartTimer(SSyncEnv *pSyncEnv);
-static int32_t   doSyncEnvStopTimer(SSyncEnv *pSyncEnv);
-static void      syncEnvTick(void *param, void *tmrId);
-// --------------------------------
+SSyncEnv *syncEnv() { return &gSyncEnv; }
 
-bool syncEnvIsStart() {
-  if (gSyncEnv == NULL) {
-    return false;
-  }
+bool syncIsInit() { return atomic_load_8(&gSyncEnv.isStart); }
 
-  return atomic_load_8(&(gSyncEnv->isStart));
-}
+int32_t syncInit() {
+  if (syncIsInit()) return 0;
 
-int32_t syncEnvStart() {
-  int32_t  ret = 0;
   uint32_t seed = (uint32_t)(taosGetTimestampNs() & 0x00000000FFFFFFFF);
   taosSeedRand(seed);
-  // gSyncEnv = doSyncEnvStart(gSyncEnv);
-  gSyncEnv = doSyncEnvStart();
-  ASSERT(gSyncEnv != NULL);
-  sTrace("sync env start ok");
-  return ret;
-}
 
-int32_t syncEnvStop() {
-  int32_t ret = doSyncEnvStop(gSyncEnv);
-  return ret;
-}
+  memset(&gSyncEnv, 0, sizeof(SSyncEnv));
+  gSyncEnv.envTickTimerCounter = 0;
+  gSyncEnv.envTickTimerMS = ENV_TICK_TIMER_MS;
+  gSyncEnv.FpEnvTickTimer = syncEnvTick;
+  atomic_store_64(&gSyncEnv.envTickTimerLogicClock, 0);
+  atomic_store_64(&gSyncEnv.envTickTimerLogicClockUser, 0);
 
-int32_t syncEnvStartTimer() {
-  int32_t ret = doSyncEnvStartTimer(gSyncEnv);
-  return ret;
-}
+  // start tmr thread
+  gSyncEnv.pTimerManager = taosTmrInit(1000, 50, 10000, "SYNC-ENV");
+  atomic_store_8(&gSyncEnv.isStart, 1);
+
+  gNodeRefId = taosOpenRef(200, (RefFp)syncNodeClose);
+  if (gNodeRefId < 0) {
+    sError("failed to init node ref");
+    syncCleanUp();
+    return -1;
+  }
 
-int32_t syncEnvStopTimer() {
-  int32_t ret = doSyncEnvStopTimer(gSyncEnv);
-  return ret;
+  sDebug("sync rsetId:%d is open", gNodeRefId);
+  return 0;
 }
 
-// local function -----------------
-static void syncEnvTick(void *param, void *tmrId) {
-  SSyncEnv *pSyncEnv = (SSyncEnv *)param;
-  if (atomic_load_64(&pSyncEnv->envTickTimerLogicClockUser) <= atomic_load_64(&pSyncEnv->envTickTimerLogicClock)) {
-    ++(pSyncEnv->envTickTimerCounter);
-    sTrace("syncEnvTick do ... envTickTimerLogicClockUser:%" PRIu64 ", envTickTimerLogicClock:%" PRIu64
-           ", envTickTimerCounter:%" PRIu64
-           ", "
-           "envTickTimerMS:%d, tmrId:%p",
-           pSyncEnv->envTickTimerLogicClockUser, pSyncEnv->envTickTimerLogicClock, pSyncEnv->envTickTimerCounter,
-           pSyncEnv->envTickTimerMS, tmrId);
+void syncCleanUp() {
+  atomic_store_8(&gSyncEnv.isStart, 0);
+  taosTmrCleanUp(gSyncEnv.pTimerManager);
+  memset(&gSyncEnv, 0, sizeof(SSyncEnv));
 
-    // do something, tick ...
-    taosTmrReset(syncEnvTick, pSyncEnv->envTickTimerMS, pSyncEnv, pSyncEnv->pTimerManager, &pSyncEnv->pEnvTickTimer);
-  } else {
-    sTrace("syncEnvTick pass ... envTickTimerLogicClockUser:%" PRIu64 ", envTickTimerLogicClock:%" PRIu64
-           ", envTickTimerCounter:%" PRIu64
-           ", "
-           "envTickTimerMS:%d, tmrId:%p",
-           pSyncEnv->envTickTimerLogicClockUser, pSyncEnv->envTickTimerLogicClock, pSyncEnv->envTickTimerCounter,
-           pSyncEnv->envTickTimerMS, tmrId);
+  if (gNodeRefId != -1) {
+    sDebug("sync rsetId:%d is closed", gNodeRefId);
+    taosCloseRef(gNodeRefId);
+    gNodeRefId = -1;
   }
 }
 
-static SSyncEnv *doSyncEnvStart() {
-  SSyncEnv *pSyncEnv = (SSyncEnv *)taosMemoryMalloc(sizeof(SSyncEnv));
-  ASSERT(pSyncEnv != NULL);
-  memset(pSyncEnv, 0, sizeof(SSyncEnv));
-
-  pSyncEnv->envTickTimerCounter = 0;
-  pSyncEnv->envTickTimerMS = ENV_TICK_TIMER_MS;
-  pSyncEnv->FpEnvTickTimer = syncEnvTick;
-  atomic_store_64(&pSyncEnv->envTickTimerLogicClock, 0);
-  atomic_store_64(&pSyncEnv->envTickTimerLogicClockUser, 0);
+int64_t syncNodeAdd(SSyncNode *pNode) {
+  pNode->rid = taosAddRef(gNodeRefId, pNode);
+  if (pNode->rid < 0) return -1;
 
-  // start tmr thread
-  pSyncEnv->pTimerManager = taosTmrInit(1000, 50, 10000, "SYNC-ENV");
+  sDebug("vgId:%d, sync rid:%" PRId64 " is added to rsetId:%d", pNode->vgId, pNode->rid, gNodeRefId);
+  return 0;
+}
 
-  atomic_store_8(&(pSyncEnv->isStart), 1);
-  return pSyncEnv;
+void syncNodeRemove(SSyncNode *pNode) {
+  taosRemoveRef(gNodeRefId, pNode->rid);
+  sDebug("vgId:%d, sync rid:%" PRId64 " is removed from rsetId:%d", pNode->vgId, pNode->rid, gNodeRefId);
 }
 
-static int32_t doSyncEnvStop(SSyncEnv *pSyncEnv) {
-  ASSERT(pSyncEnv == gSyncEnv);
-  if (pSyncEnv != NULL) {
-    atomic_store_8(&(pSyncEnv->isStart), 0);
-    taosTmrCleanUp(pSyncEnv->pTimerManager);
-    taosMemoryFree(pSyncEnv);
+SSyncNode *syncNodeAcquire(int64_t rid) {
+  SSyncNode *pNode = taosAcquireRef(gNodeRefId, rid);
+  if (pNode == NULL) {
+    sTrace("failed to acquire node from refId:%" PRId64, rid);
   }
-  gSyncEnv = NULL;
-  return 0;
+
+  return pNode;
 }
 
-static int32_t doSyncEnvStartTimer(SSyncEnv *pSyncEnv) {
-  int32_t ret = 0;
-  taosTmrReset(pSyncEnv->FpEnvTickTimer, pSyncEnv->envTickTimerMS, pSyncEnv, pSyncEnv->pTimerManager,
-               &pSyncEnv->pEnvTickTimer);
-  atomic_store_64(&pSyncEnv->envTickTimerLogicClock, pSyncEnv->envTickTimerLogicClockUser);
-  return ret;
+void syncNodeRelease(SSyncNode *pNode) { taosReleaseRef(gNodeRefId, pNode->rid); }
+
+#if 0
+void syncEnvStartTimer() {
+  taosTmrReset(gSyncEnv.FpEnvTickTimer, gSyncEnv.envTickTimerMS, &gSyncEnv, gSyncEnv.pTimerManager,
+               &gSyncEnv.pEnvTickTimer);
+  atomic_store_64(&gSyncEnv.envTickTimerLogicClock, gSyncEnv.envTickTimerLogicClockUser);
 }
 
-static int32_t doSyncEnvStopTimer(SSyncEnv *pSyncEnv) {
+void syncEnvStopTimer() {
   int32_t ret = 0;
-  atomic_add_fetch_64(&pSyncEnv->envTickTimerLogicClockUser, 1);
-  taosTmrStop(pSyncEnv->pEnvTickTimer);
-  pSyncEnv->pEnvTickTimer = NULL;
+  atomic_add_fetch_64(&gSyncEnv.envTickTimerLogicClockUser, 1);
+  taosTmrStop(gSyncEnv.pEnvTickTimer);
+  gSyncEnv.pEnvTickTimer = NULL;
   return ret;
 }
+#endif
+
+static void syncEnvTick(void *param, void *tmrId) {
+  SSyncEnv *pSyncEnv = param;
+  if (atomic_load_64(&gSyncEnv.envTickTimerLogicClockUser) <= atomic_load_64(&gSyncEnv.envTickTimerLogicClock)) {
+    gSyncEnv.envTickTimerCounter++;
+    sTrace("syncEnvTick do ... envTickTimerLogicClockUser:%" PRIu64 ", envTickTimerLogicClock:%" PRIu64
+           ", envTickTimerCounter:%" PRIu64 ", envTickTimerMS:%d, tmrId:%p",
+           gSyncEnv.envTickTimerLogicClockUser, gSyncEnv.envTickTimerLogicClock, gSyncEnv.envTickTimerCounter,
+           gSyncEnv.envTickTimerMS, tmrId);
+
+    // do something, tick ...
+    taosTmrReset(syncEnvTick, gSyncEnv.envTickTimerMS, pSyncEnv, gSyncEnv.pTimerManager, &gSyncEnv.pEnvTickTimer);
+  } else {
+    sTrace("syncEnvTick pass ... envTickTimerLogicClockUser:%" PRIu64 ", envTickTimerLogicClock:%" PRIu64
+           ", envTickTimerCounter:%" PRIu64 ", envTickTimerMS:%d, tmrId:%p",
+           gSyncEnv.envTickTimerLogicClockUser, gSyncEnv.envTickTimerLogicClock, gSyncEnv.envTickTimerCounter,
+           gSyncEnv.envTickTimerMS, tmrId);
+  }
+}
diff --git a/source/libs/sync/src/syncMain.c b/source/libs/sync/src/syncMain.c
index 7142e8fb22f69b3d873a595059be945447c634c7..9ff8917b0f7fa7d45da8ffcb1617a91ca282a049 100644
--- a/source/libs/sync/src/syncMain.c
+++ b/source/libs/sync/src/syncMain.c
@@ -33,11 +33,6 @@
 #include "syncTimeout.h"
 #include "syncUtil.h"
 #include "syncVoteMgr.h"
-#include "tref.h"
-
-bool gRaftDetailLog = false;
-
-static int32_t tsNodeRefId = -1;
 
 // ------ local funciton ---------
 // enqueue message ----
@@ -52,138 +47,36 @@ static void    syncNodeEqPeerHeartbeatTimer(void* param, void* tmrId);
 int32_t syncNodeOnPing(SSyncNode* ths, SyncPing* pMsg);
 int32_t syncNodeOnPingReply(SSyncNode* ths, SyncPingReply* pMsg);
 
-// ---------------------------------
-static void syncNodeFreeCb(void* param) {
-  syncNodeClose(param);
-  param = NULL;
-}
-
-int32_t syncInit() {
-  int32_t ret = 0;
-
-  if (!syncEnvIsStart()) {
-    tsNodeRefId = taosOpenRef(200, syncNodeFreeCb);
-    if (tsNodeRefId < 0) {
-      sError("failed to init node ref");
-      syncCleanUp();
-      ret = -1;
-    } else {
-      sDebug("sync rsetId:%d is open", tsNodeRefId);
-      ret = syncEnvStart();
-    }
-  }
-
-  return ret;
-}
-
-void syncCleanUp() {
-  int32_t ret = syncEnvStop();
-  ASSERT(ret == 0);
-
-  if (tsNodeRefId != -1) {
-    sDebug("sync rsetId:%d is closed", tsNodeRefId);
-    taosCloseRef(tsNodeRefId);
-    tsNodeRefId = -1;
-  }
-}
-
 int64_t syncOpen(SSyncInfo* pSyncInfo) {
-  SSyncNode* pSyncNode = syncNodeOpen(pSyncInfo);
-  if (pSyncNode == NULL) {
+  SSyncNode* pNode = syncNodeOpen(pSyncInfo);
+  if (pNode == NULL) {
     sError("vgId:%d, failed to open sync node", pSyncInfo->vgId);
     return -1;
   }
 
-  pSyncNode->rid = taosAddRef(tsNodeRefId, pSyncNode);
-  if (pSyncNode->rid < 0) {
-    syncNodeClose(pSyncNode);
-    pSyncNode = NULL;
+  pNode->rid = syncNodeAdd(pNode);
+  if (pNode->rid < 0) {
+    syncNodeClose(pNode);
     return -1;
   }
 
-  sDebug("vgId:%d, sync rid:%" PRId64 " is added to rsetId:%d", pSyncInfo->vgId, pSyncNode->rid, tsNodeRefId);
-  return pSyncNode->rid;
+  return pNode->rid;
 }
 
 void syncStart(int64_t rid) {
-  SSyncNode* pSyncNode = taosAcquireRef(tsNodeRefId, rid);
-  if (pSyncNode == NULL) {
-    return;
-  }
-
-  if (pSyncNode->pRaftCfg->isStandBy) {
-    syncNodeStartStandBy(pSyncNode);
-  } else {
-    syncNodeStart(pSyncNode);
-  }
-
-  taosReleaseRef(tsNodeRefId, pSyncNode->rid);
-}
-
-void syncStartNormal(int64_t rid) {
-  SSyncNode* pSyncNode = taosAcquireRef(tsNodeRefId, rid);
-  if (pSyncNode == NULL) {
-    return;
-  }
-  syncNodeStart(pSyncNode);
-
-  taosReleaseRef(tsNodeRefId, pSyncNode->rid);
-}
-
-void syncStartStandBy(int64_t rid) {
-  SSyncNode* pSyncNode = taosAcquireRef(tsNodeRefId, rid);
-  if (pSyncNode == NULL) {
-    return;
+  SSyncNode* pNode = syncNodeAcquire(rid);
+  if (pNode != NULL) {
+    syncNodeStart(pNode);
+    syncNodeRelease(pNode);
   }
-  syncNodeStartStandBy(pSyncNode);
-
-  taosReleaseRef(tsNodeRefId, pSyncNode->rid);
 }
 
 void syncStop(int64_t rid) {
-  SSyncNode* pSyncNode = taosAcquireRef(tsNodeRefId, rid);
-  if (pSyncNode == NULL) return;
-  int32_t vgId = pSyncNode->vgId;
-  taosReleaseRef(tsNodeRefId, pSyncNode->rid);
-
-  taosRemoveRef(tsNodeRefId, rid);
-  sDebug("vgId:%d, sync rid:%" PRId64 " is removed from rsetId:%d", vgId, rid, tsNodeRefId);
-}
-
-int32_t syncSetStandby(int64_t rid) {
-  SSyncNode* pSyncNode = taosAcquireRef(tsNodeRefId, rid);
-  if (pSyncNode == NULL) {
-    terrno = TSDB_CODE_SYN_INTERNAL_ERROR;
-    sError("failed to set standby since accquire ref error, rid:%" PRId64, rid);
-    return -1;
+  SSyncNode* pNode = syncNodeAcquire(rid);
+  if (pNode != NULL) {
+    syncNodeRelease(pNode);
+    syncNodeRemove(pNode);
   }
-
-  if (pSyncNode->state != TAOS_SYNC_STATE_FOLLOWER) {
-    if (pSyncNode->state == TAOS_SYNC_STATE_LEADER) {
-      terrno = TSDB_CODE_SYN_IS_LEADER;
-    } else {
-      terrno = TSDB_CODE_SYN_STANDBY_NOT_READY;
-    }
-    sError("failed to set standby since it is not follower, state:%s rid:%" PRId64, syncStr(pSyncNode->state), rid);
-    taosReleaseRef(tsNodeRefId, pSyncNode->rid);
-    return -1;
-  }
-
-  // state change
-  pSyncNode->state = TAOS_SYNC_STATE_FOLLOWER;
-  syncNodeStopHeartbeatTimer(pSyncNode);
-
-  // reset elect timer, long enough
-  int32_t electMS = TIMER_MAX_MS;
-  int32_t ret = syncNodeRestartElectTimer(pSyncNode, electMS);
-  ASSERT(ret == 0);
-
-  pSyncNode->pRaftCfg->isStandBy = 1;
-  raftCfgPersist(pSyncNode->pRaftCfg);
-
-  taosReleaseRef(tsNodeRefId, pSyncNode->rid);
-  sInfo("vgId:%d, set to standby", pSyncNode->vgId);
-  return 0;
 }
 
 bool syncNodeCheckNewConfig(SSyncNode* pSyncNode, const SSyncCfg* pNewCfg) {
@@ -204,7 +97,7 @@ bool syncNodeCheckNewConfig(SSyncNode* pSyncNode, const SSyncCfg* pNewCfg) {
 }
 
 int32_t syncReconfigBuild(int64_t rid, const SSyncCfg* pNewCfg, SRpcMsg* pRpcMsg) {
-  SSyncNode* pSyncNode = (SSyncNode*)taosAcquireRef(tsNodeRefId, rid);
+  SSyncNode* pSyncNode = syncNodeAcquire(rid);
   if (pSyncNode == NULL) {
     terrno = TSDB_CODE_SYN_INTERNAL_ERROR;
     return -1;
@@ -213,7 +106,7 @@ int32_t syncReconfigBuild(int64_t rid, const SSyncCfg* pNewCfg, SRpcMsg* pRpcMsg
   int32_t ret = 0;
 
   if (!syncNodeCheckNewConfig(pSyncNode, pNewCfg)) {
-    taosReleaseRef(tsNodeRefId, pSyncNode->rid);
+    syncNodeRelease(pSyncNode);
     terrno = TSDB_CODE_SYN_NEW_CONFIG_ERROR;
     sError("invalid new config. vgId:%d", pSyncNode->vgId);
     return -1;
@@ -227,12 +120,12 @@ int32_t syncReconfigBuild(int64_t rid, const SSyncCfg* pNewCfg, SRpcMsg* pRpcMsg
   snprintf(pRpcMsg->pCont, pRpcMsg->contLen, "%s", newconfig);
   taosMemoryFree(newconfig);
 
-  taosReleaseRef(tsNodeRefId, pSyncNode->rid);
+  syncNodeRelease(pSyncNode);
   return ret;
 }
 
 int32_t syncReconfig(int64_t rid, SSyncCfg* pNewCfg) {
-  SSyncNode* pSyncNode = (SSyncNode*)taosAcquireRef(tsNodeRefId, rid);
+  SSyncNode* pSyncNode = syncNodeAcquire(rid);
   if (pSyncNode == NULL) {
     terrno = TSDB_CODE_SYN_INTERNAL_ERROR;
     return -1;
@@ -240,7 +133,7 @@ int32_t syncReconfig(int64_t rid, SSyncCfg* pNewCfg) {
   ASSERT(rid == pSyncNode->rid);
 
   if (!syncNodeCheckNewConfig(pSyncNode, pNewCfg)) {
-    taosReleaseRef(tsNodeRefId, pSyncNode->rid);
+    syncNodeRelease(pSyncNode);
     terrno = TSDB_CODE_SYN_NEW_CONFIG_ERROR;
     sError("invalid new config. vgId:%d", pSyncNode->vgId);
     return -1;
@@ -259,7 +152,7 @@ int32_t syncReconfig(int64_t rid, SSyncCfg* pNewCfg) {
   taosMemoryFree(newconfig);
   ret = syncNodePropose(pSyncNode, &rpcMsg, false);
 
-  taosReleaseRef(tsNodeRefId, pSyncNode->rid);
+  syncNodeRelease(pSyncNode);
   return ret;
 #else
   syncNodeUpdateNewConfigIndex(pSyncNode, pNewCfg);
@@ -275,13 +168,13 @@ int32_t syncReconfig(int64_t rid, SSyncCfg* pNewCfg) {
 
     syncNodeReplicate(pSyncNode);
   }
-  taosReleaseRef(tsNodeRefId, pSyncNode->rid);
+  syncNodeRelease(pSyncNode);
   return 0;
 #endif
 }
 
 int32_t syncLeaderTransfer(int64_t rid) {
-  SSyncNode* pSyncNode = (SSyncNode*)taosAcquireRef(tsNodeRefId, rid);
+  SSyncNode* pSyncNode = syncNodeAcquire(rid);
   if (pSyncNode == NULL) {
     terrno = TSDB_CODE_SYN_INTERNAL_ERROR;
     return -1;
@@ -289,12 +182,12 @@ int32_t syncLeaderTransfer(int64_t rid) {
   ASSERT(rid == pSyncNode->rid);
 
   int32_t ret = syncNodeLeaderTransfer(pSyncNode);
-  taosReleaseRef(tsNodeRefId, pSyncNode->rid);
+  syncNodeRelease(pSyncNode);
   return ret;
 }
 
 int32_t syncLeaderTransferTo(int64_t rid, SNodeInfo newLeader) {
-  SSyncNode* pSyncNode = (SSyncNode*)taosAcquireRef(tsNodeRefId, rid);
+  SSyncNode* pSyncNode = syncNodeAcquire(rid);
   if (pSyncNode == NULL) {
     terrno = TSDB_CODE_SYN_INTERNAL_ERROR;
     return -1;
@@ -302,7 +195,7 @@ int32_t syncLeaderTransferTo(int64_t rid, SNodeInfo newLeader) {
   ASSERT(rid == pSyncNode->rid);
 
   int32_t ret = syncNodeLeaderTransferTo(pSyncNode, newLeader);
-  taosReleaseRef(tsNodeRefId, pSyncNode->rid);
+  syncNodeRelease(pSyncNode);
   return ret;
 }
 
@@ -358,7 +251,7 @@ char* syncNodePeerState2Str(const SSyncNode* pSyncNode) {
 }
 
 int32_t syncBeginSnapshot(int64_t rid, int64_t lastApplyIndex) {
-  SSyncNode* pSyncNode = (SSyncNode*)taosAcquireRef(tsNodeRefId, rid);
+  SSyncNode* pSyncNode = syncNodeAcquire(rid);
   if (pSyncNode == NULL) {
     terrno = TSDB_CODE_SYN_INTERNAL_ERROR;
     return -1;
@@ -382,7 +275,7 @@ int32_t syncBeginSnapshot(int64_t rid, int64_t lastApplyIndex) {
                logNum, isEmpty);
       syncNodeEventLog(pSyncNode, logBuf);
 
-      taosReleaseRef(tsNodeRefId, pSyncNode->rid);
+      syncNodeRelease(pSyncNode);
       return 0;
     }
 
@@ -411,7 +304,7 @@ int32_t syncBeginSnapshot(int64_t rid, int64_t lastApplyIndex) {
               syncNodeEventLog(pSyncNode, logBuf);
             } while (0);
 
-            taosReleaseRef(tsNodeRefId, pSyncNode->rid);
+            syncNodeRelease(pSyncNode);
             return 0;
           }
         }
@@ -424,7 +317,7 @@ int32_t syncBeginSnapshot(int64_t rid, int64_t lastApplyIndex) {
                    lastApplyIndex, pSyncNode->minMatchIndex);
           syncNodeEventLog(pSyncNode, logBuf);
 
-          taosReleaseRef(tsNodeRefId, pSyncNode->rid);
+          syncNodeRelease(pSyncNode);
           return 0;
         }
 
@@ -433,7 +326,7 @@ int32_t syncBeginSnapshot(int64_t rid, int64_t lastApplyIndex) {
         snprintf(logBuf, sizeof(logBuf), "new-snapshot-index:%" PRId64 " candidate, do not delete wal", lastApplyIndex);
         syncNodeEventLog(pSyncNode, logBuf);
 
-        taosReleaseRef(tsNodeRefId, pSyncNode->rid);
+        syncNodeRelease(pSyncNode);
         return 0;
 
       } else {
@@ -442,7 +335,7 @@ int32_t syncBeginSnapshot(int64_t rid, int64_t lastApplyIndex) {
                  lastApplyIndex);
         syncNodeEventLog(pSyncNode, logBuf);
 
-        taosReleaseRef(tsNodeRefId, pSyncNode->rid);
+        syncNodeRelease(pSyncNode);
         return 0;
       }
 
@@ -491,12 +384,12 @@ _DEL_WAL:
     }
   } while (0);
 
-  taosReleaseRef(tsNodeRefId, pSyncNode->rid);
+  syncNodeRelease(pSyncNode);
   return code;
 }
 
 int32_t syncEndSnapshot(int64_t rid) {
-  SSyncNode* pSyncNode = (SSyncNode*)taosAcquireRef(tsNodeRefId, rid);
+  SSyncNode* pSyncNode = syncNodeAcquire(rid);
   if (pSyncNode == NULL) {
     terrno = TSDB_CODE_SYN_INTERNAL_ERROR;
     return -1;
@@ -510,7 +403,7 @@ int32_t syncEndSnapshot(int64_t rid) {
     if (code != 0) {
       sError("vgId:%d, wal snapshot end error since:%s", pSyncNode->vgId, terrstr(terrno));
 
-      taosReleaseRef(tsNodeRefId, pSyncNode->rid);
+      syncNodeRelease(pSyncNode);
       return -1;
     } else {
       do {
@@ -524,12 +417,12 @@ int32_t syncEndSnapshot(int64_t rid) {
     }
   }
 
-  taosReleaseRef(tsNodeRefId, pSyncNode->rid);
+  syncNodeRelease(pSyncNode);
   return code;
 }
 
 int32_t syncStepDown(int64_t rid, SyncTerm newTerm) {
-  SSyncNode* pSyncNode = (SSyncNode*)taosAcquireRef(tsNodeRefId, rid);
+  SSyncNode* pSyncNode = syncNodeAcquire(rid);
   if (pSyncNode == NULL) {
     terrno = TSDB_CODE_SYN_INTERNAL_ERROR;
     return -1;
@@ -538,7 +431,7 @@ int32_t syncStepDown(int64_t rid, SyncTerm newTerm) {
 
   syncNodeStepDown(pSyncNode, newTerm);
 
-  taosReleaseRef(tsNodeRefId, pSyncNode->rid);
+  syncNodeRelease(pSyncNode);
   return 0;
 }
 
@@ -583,19 +476,19 @@ int32_t syncNodeLeaderTransferTo(SSyncNode* pSyncNode, SNodeInfo newLeader) {
 }
 
 bool syncCanLeaderTransfer(int64_t rid) {
-  SSyncNode* pSyncNode = (SSyncNode*)taosAcquireRef(tsNodeRefId, rid);
+  SSyncNode* pSyncNode = syncNodeAcquire(rid);
   if (pSyncNode == NULL) {
     return false;
   }
   ASSERT(rid == pSyncNode->rid);
 
   if (pSyncNode->replicaNum == 1) {
-    taosReleaseRef(tsNodeRefId, pSyncNode->rid);
+    syncNodeRelease(pSyncNode);
     return false;
   }
 
   if (pSyncNode->state == TAOS_SYNC_STATE_FOLLOWER) {
-    taosReleaseRef(tsNodeRefId, pSyncNode->rid);
+    syncNodeRelease(pSyncNode);
     return true;
   }
 
@@ -610,7 +503,7 @@ bool syncCanLeaderTransfer(int64_t rid) {
     }
   }
 
-  taosReleaseRef(tsNodeRefId, pSyncNode->rid);
+  syncNodeRelease(pSyncNode);
   return matchOK;
 }
 
@@ -620,25 +513,25 @@ int32_t syncForwardToPeer(int64_t rid, SRpcMsg* pMsg, bool isWeak) {
 }
 
 ESyncState syncGetMyRole(int64_t rid) {
-  SSyncNode* pSyncNode = (SSyncNode*)taosAcquireRef(tsNodeRefId, rid);
+  SSyncNode* pSyncNode = syncNodeAcquire(rid);
   if (pSyncNode == NULL) {
     return TAOS_SYNC_STATE_ERROR;
   }
   ASSERT(rid == pSyncNode->rid);
   ESyncState state = pSyncNode->state;
 
-  taosReleaseRef(tsNodeRefId, pSyncNode->rid);
+  syncNodeRelease(pSyncNode);
   return state;
 }
 
 bool syncIsReady(int64_t rid) {
-  SSyncNode* pSyncNode = (SSyncNode*)taosAcquireRef(tsNodeRefId, rid);
+  SSyncNode* pSyncNode = syncNodeAcquire(rid);
   if (pSyncNode == NULL) {
     return false;
   }
   ASSERT(rid == pSyncNode->rid);
   bool b = (pSyncNode->state == TAOS_SYNC_STATE_LEADER) && pSyncNode->restoreFinish;
-  taosReleaseRef(tsNodeRefId, pSyncNode->rid);
+  syncNodeRelease(pSyncNode);
 
   // if false, set error code
   if (false == b) {
@@ -652,14 +545,14 @@ bool syncIsReady(int64_t rid) {
 }
 
 bool syncIsRestoreFinish(int64_t rid) {
-  SSyncNode* pSyncNode = (SSyncNode*)taosAcquireRef(tsNodeRefId, rid);
+  SSyncNode* pSyncNode = syncNodeAcquire(rid);
   if (pSyncNode == NULL) {
     return false;
   }
   ASSERT(rid == pSyncNode->rid);
   bool b = pSyncNode->restoreFinish;
 
-  taosReleaseRef(tsNodeRefId, pSyncNode->rid);
+  syncNodeRelease(pSyncNode);
   return b;
 }
 
@@ -668,7 +561,7 @@ int32_t syncGetSnapshotByIndex(int64_t rid, SyncIndex index, SSnapshot* pSnapsho
     return -1;
   }
 
-  SSyncNode* pSyncNode = (SSyncNode*)taosAcquireRef(tsNodeRefId, rid);
+  SSyncNode* pSyncNode = syncNodeAcquire(rid);
   if (pSyncNode == NULL) {
     return -1;
   }
@@ -680,7 +573,7 @@ int32_t syncGetSnapshotByIndex(int64_t rid, SyncIndex index, SSnapshot* pSnapsho
     if (pEntry != NULL) {
       syncEntryDestory(pEntry);
     }
-    taosReleaseRef(tsNodeRefId, pSyncNode->rid);
+    syncNodeRelease(pSyncNode);
     return -1;
   }
   ASSERT(pEntry != NULL);
@@ -691,12 +584,12 @@ int32_t syncGetSnapshotByIndex(int64_t rid, SyncIndex index, SSnapshot* pSnapsho
   pSnapshot->lastConfigIndex = syncNodeGetSnapshotConfigIndex(pSyncNode, index);
 
   syncEntryDestory(pEntry);
-  taosReleaseRef(tsNodeRefId, pSyncNode->rid);
+  syncNodeRelease(pSyncNode);
   return 0;
 }
 
 int32_t syncGetSnapshotMeta(int64_t rid, struct SSnapshotMeta* sMeta) {
-  SSyncNode* pSyncNode = (SSyncNode*)taosAcquireRef(tsNodeRefId, rid);
+  SSyncNode* pSyncNode = syncNodeAcquire(rid);
   if (pSyncNode == NULL) {
     return -1;
   }
@@ -705,12 +598,12 @@ int32_t syncGetSnapshotMeta(int64_t rid, struct SSnapshotMeta* sMeta) {
 
   sTrace("vgId:%d, get snapshot meta, lastConfigIndex:%" PRId64, pSyncNode->vgId, pSyncNode->pRaftCfg->lastConfigIndex);
 
-  taosReleaseRef(tsNodeRefId, pSyncNode->rid);
+  syncNodeRelease(pSyncNode);
   return 0;
 }
 
 int32_t syncGetSnapshotMetaByIndex(int64_t rid, SyncIndex snapshotIndex, struct SSnapshotMeta* sMeta) {
-  SSyncNode* pSyncNode = (SSyncNode*)taosAcquireRef(tsNodeRefId, rid);
+  SSyncNode* pSyncNode = syncNodeAcquire(rid);
   if (pSyncNode == NULL) {
     return -1;
   }
@@ -729,7 +622,7 @@ int32_t syncGetSnapshotMetaByIndex(int64_t rid, SyncIndex snapshotIndex, struct
   sTrace("vgId:%d, get snapshot meta by index:%" PRId64 " lcindex:%" PRId64, pSyncNode->vgId, snapshotIndex,
          sMeta->lastConfigIndex);
 
-  taosReleaseRef(tsNodeRefId, pSyncNode->rid);
+  syncNodeRelease(pSyncNode);
   return 0;
 }
 
@@ -755,67 +648,67 @@ const char* syncGetMyRoleStr(int64_t rid) {
 }
 
 bool syncRestoreFinish(int64_t rid) {
-  SSyncNode* pSyncNode = (SSyncNode*)taosAcquireRef(tsNodeRefId, rid);
+  SSyncNode* pSyncNode = syncNodeAcquire(rid);
   if (pSyncNode == NULL) {
     return false;
   }
   ASSERT(rid == pSyncNode->rid);
   bool restoreFinish = pSyncNode->restoreFinish;
 
-  taosReleaseRef(tsNodeRefId, pSyncNode->rid);
+  syncNodeRelease(pSyncNode);
   return restoreFinish;
 }
 
 SyncTerm syncGetMyTerm(int64_t rid) {
-  SSyncNode* pSyncNode = (SSyncNode*)taosAcquireRef(tsNodeRefId, rid);
+  SSyncNode* pSyncNode = syncNodeAcquire(rid);
   if (pSyncNode == NULL) {
     return TAOS_SYNC_STATE_ERROR;
   }
   ASSERT(rid == pSyncNode->rid);
   SyncTerm term = pSyncNode->pRaftStore->currentTerm;
 
-  taosReleaseRef(tsNodeRefId, pSyncNode->rid);
+  syncNodeRelease(pSyncNode);
   return term;
 }
 
 SyncIndex syncGetLastIndex(int64_t rid) {
-  SSyncNode* pSyncNode = (SSyncNode*)taosAcquireRef(tsNodeRefId, rid);
+  SSyncNode* pSyncNode = syncNodeAcquire(rid);
   if (pSyncNode == NULL) {
     return SYNC_INDEX_INVALID;
   }
   ASSERT(rid == pSyncNode->rid);
   SyncIndex lastIndex = syncNodeGetLastIndex(pSyncNode);
 
-  taosReleaseRef(tsNodeRefId, pSyncNode->rid);
+  syncNodeRelease(pSyncNode);
   return lastIndex;
 }
 
 SyncIndex syncGetCommitIndex(int64_t rid) {
-  SSyncNode* pSyncNode = (SSyncNode*)taosAcquireRef(tsNodeRefId, rid);
+  SSyncNode* pSyncNode = syncNodeAcquire(rid);
   if (pSyncNode == NULL) {
     return SYNC_INDEX_INVALID;
   }
   ASSERT(rid == pSyncNode->rid);
   SyncIndex cmtIndex = pSyncNode->commitIndex;
 
-  taosReleaseRef(tsNodeRefId, pSyncNode->rid);
+  syncNodeRelease(pSyncNode);
   return cmtIndex;
 }
 
 SyncGroupId syncGetVgId(int64_t rid) {
-  SSyncNode* pSyncNode = (SSyncNode*)taosAcquireRef(tsNodeRefId, rid);
+  SSyncNode* pSyncNode = syncNodeAcquire(rid);
   if (pSyncNode == NULL) {
     return TAOS_SYNC_STATE_ERROR;
   }
   ASSERT(rid == pSyncNode->rid);
   SyncGroupId vgId = pSyncNode->vgId;
 
-  taosReleaseRef(tsNodeRefId, pSyncNode->rid);
+  syncNodeRelease(pSyncNode);
   return vgId;
 }
 
 void syncGetEpSet(int64_t rid, SEpSet* pEpSet) {
-  SSyncNode* pSyncNode = (SSyncNode*)taosAcquireRef(tsNodeRefId, rid);
+  SSyncNode* pSyncNode = syncNodeAcquire(rid);
   if (pSyncNode == NULL) {
     memset(pEpSet, 0, sizeof(*pEpSet));
     return;
@@ -831,11 +724,11 @@ void syncGetEpSet(int64_t rid, SEpSet* pEpSet) {
   pEpSet->inUse = pSyncNode->pRaftCfg->cfg.myIndex;
   sInfo("vgId:%d, sync get epset in-use:%d", pSyncNode->vgId, pEpSet->inUse);
 
-  taosReleaseRef(tsNodeRefId, pSyncNode->rid);
+  syncNodeRelease(pSyncNode);
 }
 
 void syncGetRetryEpSet(int64_t rid, SEpSet* pEpSet) {
-  SSyncNode* pSyncNode = (SSyncNode*)taosAcquireRef(tsNodeRefId, rid);
+  SSyncNode* pSyncNode = syncNodeAcquire(rid);
   if (pSyncNode == NULL) {
     memset(pEpSet, 0, sizeof(*pEpSet));
     return;
@@ -854,11 +747,11 @@ void syncGetRetryEpSet(int64_t rid, SEpSet* pEpSet) {
   }
   sInfo("vgId:%d, sync get retry epset in-use:%d", pSyncNode->vgId, pEpSet->inUse);
 
-  taosReleaseRef(tsNodeRefId, pSyncNode->rid);
+  syncNodeRelease(pSyncNode);
 }
 
 int32_t syncGetRespRpc(int64_t rid, uint64_t index, SRpcMsg* msg) {
-  SSyncNode* pSyncNode = (SSyncNode*)taosAcquireRef(tsNodeRefId, rid);
+  SSyncNode* pSyncNode = syncNodeAcquire(rid);
   if (pSyncNode == NULL) {
     return TAOS_SYNC_STATE_ERROR;
   }
@@ -870,12 +763,12 @@ int32_t syncGetRespRpc(int64_t rid, uint64_t index, SRpcMsg* msg) {
     memcpy(msg, &(stub.rpcMsg), sizeof(SRpcMsg));
   }
 
-  taosReleaseRef(tsNodeRefId, pSyncNode->rid);
+  syncNodeRelease(pSyncNode);
   return ret;
 }
 
 int32_t syncGetAndDelRespRpc(int64_t rid, uint64_t index, SRpcHandleInfo* pInfo) {
-  SSyncNode* pSyncNode = (SSyncNode*)taosAcquireRef(tsNodeRefId, rid);
+  SSyncNode* pSyncNode = syncNodeAcquire(rid);
   if (pSyncNode == NULL) {
     return TAOS_SYNC_STATE_ERROR;
   }
@@ -888,12 +781,12 @@ int32_t syncGetAndDelRespRpc(int64_t rid, uint64_t index, SRpcHandleInfo* pInfo)
   }
 
   sTrace("vgId:%d, get seq:%" PRIu64 " rpc handle:%p", pSyncNode->vgId, index, pInfo->handle);
-  taosReleaseRef(tsNodeRefId, pSyncNode->rid);
+  syncNodeRelease(pSyncNode);
   return ret;
 }
 
 void syncSetMsgCb(int64_t rid, const SMsgCb* msgcb) {
-  SSyncNode* pSyncNode = (SSyncNode*)taosAcquireRef(tsNodeRefId, rid);
+  SSyncNode* pSyncNode = syncNodeAcquire(rid);
   if (pSyncNode == NULL) {
     sTrace("syncSetQ get pSyncNode is NULL, rid:%" PRId64, rid);
     return;
@@ -901,24 +794,24 @@ void syncSetMsgCb(int64_t rid, const SMsgCb* msgcb) {
   ASSERT(rid == pSyncNode->rid);
   pSyncNode->msgcb = msgcb;
 
-  taosReleaseRef(tsNodeRefId, pSyncNode->rid);
+  syncNodeRelease(pSyncNode);
 }
 
 char* sync2SimpleStr(int64_t rid) {
-  SSyncNode* pSyncNode = (SSyncNode*)taosAcquireRef(tsNodeRefId, rid);
+  SSyncNode* pSyncNode = syncNodeAcquire(rid);
   if (pSyncNode == NULL) {
     sTrace("syncSetRpc get pSyncNode is NULL, rid:%" PRId64, rid);
     return NULL;
   }
   ASSERT(rid == pSyncNode->rid);
   char* s = syncNode2SimpleStr(pSyncNode);
-  taosReleaseRef(tsNodeRefId, pSyncNode->rid);
+  syncNodeRelease(pSyncNode);
 
   return s;
 }
 
 void setPingTimerMS(int64_t rid, int32_t pingTimerMS) {
-  SSyncNode* pSyncNode = (SSyncNode*)taosAcquireRef(tsNodeRefId, rid);
+  SSyncNode* pSyncNode = syncNodeAcquire(rid);
   if (pSyncNode == NULL) {
     return;
   }
@@ -926,22 +819,22 @@ void setPingTimerMS(int64_t rid, int32_t pingTimerMS) {
   pSyncNode->pingBaseLine = pingTimerMS;
   pSyncNode->pingTimerMS = pingTimerMS;
 
-  taosReleaseRef(tsNodeRefId, pSyncNode->rid);
+  syncNodeRelease(pSyncNode);
 }
 
 void setElectTimerMS(int64_t rid, int32_t electTimerMS) {
-  SSyncNode* pSyncNode = (SSyncNode*)taosAcquireRef(tsNodeRefId, rid);
+  SSyncNode* pSyncNode = syncNodeAcquire(rid);
   if (pSyncNode == NULL) {
     return;
   }
   ASSERT(rid == pSyncNode->rid);
   pSyncNode->electBaseLine = electTimerMS;
 
-  taosReleaseRef(tsNodeRefId, pSyncNode->rid);
+  syncNodeRelease(pSyncNode);
 }
 
 void setHeartbeatTimerMS(int64_t rid, int32_t hbTimerMS) {
-  SSyncNode* pSyncNode = (SSyncNode*)taosAcquireRef(tsNodeRefId, rid);
+  SSyncNode* pSyncNode = syncNodeAcquire(rid);
   if (pSyncNode == NULL) {
     return;
   }
@@ -949,20 +842,20 @@ void setHeartbeatTimerMS(int64_t rid, int32_t hbTimerMS) {
   pSyncNode->hbBaseLine = hbTimerMS;
   pSyncNode->heartbeatTimerMS = hbTimerMS;
 
-  taosReleaseRef(tsNodeRefId, pSyncNode->rid);
+  syncNodeRelease(pSyncNode);
 }
 
 int32_t syncPropose(int64_t rid, SRpcMsg* pMsg, bool isWeak) {
-  SSyncNode* pSyncNode = taosAcquireRef(tsNodeRefId, rid);
+  SSyncNode* pSyncNode = syncNodeAcquire(rid);
   if (pSyncNode == NULL) {
-    taosReleaseRef(tsNodeRefId, rid);
+    syncNodeRelease(pSyncNode);
     terrno = TSDB_CODE_SYN_INTERNAL_ERROR;
     return -1;
   }
   ASSERT(rid == pSyncNode->rid);
 
   int32_t ret = syncNodePropose(pSyncNode, pMsg, isWeak);
-  taosReleaseRef(tsNodeRefId, pSyncNode->rid);
+  syncNodeRelease(pSyncNode);
   return ret;
 }
 
@@ -1084,7 +977,7 @@ int32_t syncHbTimerInit(SSyncNode* pSyncNode, SSyncTimer* pSyncTimer, SRaftId de
 
 int32_t syncHbTimerStart(SSyncNode* pSyncNode, SSyncTimer* pSyncTimer) {
   int32_t ret = 0;
-  if (syncEnvIsStart()) {
+  if (syncIsInit()) {
     SSyncHbTimerData* pData = taosMemoryMalloc(sizeof(SSyncHbTimerData));
     pData->pSyncNode = pSyncNode;
     pData->pTimer = pSyncTimer;
@@ -1092,7 +985,7 @@ int32_t syncHbTimerStart(SSyncNode* pSyncNode, SSyncTimer* pSyncTimer) {
     pData->logicClock = pSyncTimer->logicClock;
 
     pSyncTimer->pData = pData;
-    taosTmrReset(pSyncTimer->timerCb, pSyncTimer->timerMS, pData, gSyncEnv->pTimerManager, &pSyncTimer->pTimer);
+    taosTmrReset(pSyncTimer->timerCb, pSyncTimer->timerMS, pData, syncEnv()->pTimerManager, &pSyncTimer->pTimer);
   } else {
     sError("vgId:%d, start ctrl hb timer error, sync env is stop", pSyncNode->vgId);
   }
@@ -1556,8 +1449,8 @@ int32_t syncNodePingAll(SSyncNode* pSyncNode) {
 // timer control --------------
 int32_t syncNodeStartPingTimer(SSyncNode* pSyncNode) {
   int32_t ret = 0;
-  if (syncEnvIsStart()) {
-    taosTmrReset(pSyncNode->FpPingTimerCB, pSyncNode->pingTimerMS, pSyncNode, gSyncEnv->pTimerManager,
+  if (syncIsInit()) {
+    taosTmrReset(pSyncNode->FpPingTimerCB, pSyncNode->pingTimerMS, pSyncNode, syncEnv()->pTimerManager,
                  &pSyncNode->pPingTimer);
     atomic_store_64(&pSyncNode->pingTimerLogicClock, pSyncNode->pingTimerLogicClockUser);
   } else {
@@ -1576,7 +1469,7 @@ int32_t syncNodeStopPingTimer(SSyncNode* pSyncNode) {
 
 int32_t syncNodeStartElectTimer(SSyncNode* pSyncNode, int32_t ms) {
   int32_t ret = 0;
-  if (syncEnvIsStart()) {
+  if (syncIsInit()) {
     pSyncNode->electTimerMS = ms;
 
     SElectTimer* pElectTimer = taosMemoryMalloc(sizeof(SElectTimer));
@@ -1584,7 +1477,7 @@ int32_t syncNodeStartElectTimer(SSyncNode* pSyncNode, int32_t ms) {
     pElectTimer->pSyncNode = pSyncNode;
     pElectTimer->pData = NULL;
 
-    taosTmrReset(pSyncNode->FpElectTimerCB, pSyncNode->electTimerMS, pElectTimer, gSyncEnv->pTimerManager,
+    taosTmrReset(pSyncNode->FpElectTimerCB, pSyncNode->electTimerMS, pElectTimer, syncEnv()->pTimerManager,
                  &pSyncNode->pElectTimer);
 
   } else {
@@ -1632,8 +1525,8 @@ int32_t syncNodeResetElectTimer(SSyncNode* pSyncNode) {
 
 static int32_t syncNodeDoStartHeartbeatTimer(SSyncNode* pSyncNode) {
   int32_t ret = 0;
-  if (syncEnvIsStart()) {
-    taosTmrReset(pSyncNode->FpHeartbeatTimerCB, pSyncNode->heartbeatTimerMS, pSyncNode, gSyncEnv->pTimerManager,
+  if (syncIsInit()) {
+    taosTmrReset(pSyncNode->FpHeartbeatTimerCB, pSyncNode->heartbeatTimerMS, pSyncNode, syncEnv()->pTimerManager,
                  &pSyncNode->pHeartbeatTimer);
     atomic_store_64(&pSyncNode->heartbeatTimerLogicClock, pSyncNode->heartbeatTimerLogicClockUser);
   } else {
@@ -2325,17 +2218,6 @@ _END:
   return;
 }
 
-SSyncNode* syncNodeAcquire(int64_t rid) {
-  SSyncNode* pNode = taosAcquireRef(tsNodeRefId, rid);
-  if (pNode == NULL) {
-    sTrace("failed to acquire node from refId:%" PRId64, rid);
-  }
-
-  return pNode;
-}
-
-void syncNodeRelease(SSyncNode* pNode) { taosReleaseRef(tsNodeRefId, pNode->rid); }
-
 // raft state change --------------
 void syncNodeUpdateTerm(SSyncNode* pSyncNode, SyncTerm term) {
   if (term > pSyncNode->pRaftStore->currentTerm) {
@@ -2786,8 +2668,8 @@ static void syncNodeEqPingTimer(void* param, void* tmrId) {
     }
     syncTimeoutDestroy(pSyncMsg);
 
-    if (syncEnvIsStart()) {
-      taosTmrReset(syncNodeEqPingTimer, pSyncNode->pingTimerMS, pSyncNode, gSyncEnv->pTimerManager,
+    if (syncIsInit()) {
+      taosTmrReset(syncNodeEqPingTimer, pSyncNode->pingTimerMS, pSyncNode, syncEnv()->pTimerManager,
                    &pSyncNode->pPingTimer);
     } else {
       sError("sync env is stop, syncNodeEqPingTimer");
@@ -2832,9 +2714,9 @@ static void syncNodeEqElectTimer(void* param, void* tmrId) {
 
 #if 0
   // reset timer ms
-  if (syncEnvIsStart() && pSyncNode->electBaseLine > 0) {
+  if (syncIsInit() && pSyncNode->electBaseLine > 0) {
     pSyncNode->electTimerMS = syncUtilElectRandomMS(pSyncNode->electBaseLine, 2 * pSyncNode->electBaseLine);
-    taosTmrReset(syncNodeEqElectTimer, pSyncNode->electTimerMS, pSyncNode, gSyncEnv->pTimerManager,
+    taosTmrReset(syncNodeEqElectTimer, pSyncNode->electTimerMS, pSyncNode, syncEnv()->pTimerManager,
                  &pSyncNode->pElectTimer);
   } else {
     sError("sync env is stop, syncNodeEqElectTimer");
@@ -2869,8 +2751,8 @@ static void syncNodeEqHeartbeatTimer(void* param, void* tmrId) {
       }
       syncTimeoutDestroy(pSyncMsg);
 
-      if (syncEnvIsStart()) {
-        taosTmrReset(syncNodeEqHeartbeatTimer, pSyncNode->heartbeatTimerMS, pSyncNode, gSyncEnv->pTimerManager,
+      if (syncIsInit()) {
+        taosTmrReset(syncNodeEqHeartbeatTimer, pSyncNode->heartbeatTimerMS, pSyncNode, syncEnv()->pTimerManager,
                      &pSyncNode->pHeartbeatTimer);
       } else {
         sError("sync env is stop, syncNodeEqHeartbeatTimer");
@@ -2930,8 +2812,8 @@ static void syncNodeEqPeerHeartbeatTimer(void* param, void* tmrId) {
 
       syncHeartbeatDestroy(pSyncMsg);
 
-      if (syncEnvIsStart()) {
-        taosTmrReset(syncNodeEqPeerHeartbeatTimer, pSyncTimer->timerMS, pData, gSyncEnv->pTimerManager,
+      if (syncIsInit()) {
+        taosTmrReset(syncNodeEqPeerHeartbeatTimer, pSyncTimer->timerMS, pData, syncEnv()->pTimerManager,
                      &pSyncTimer->pTimer);
       } else {
         sError("sync env is stop, syncNodeEqHeartbeatTimer");
diff --git a/source/libs/sync/test/syncElectTest.cpp b/source/libs/sync/test/syncElectTest.cpp
index 862f7bd0baebed56d2e103c56ae1a88e9074c8ea..d09879a69936db6d873ecafb86cc3c9bab3640be 100644
--- a/source/libs/sync/test/syncElectTest.cpp
+++ b/source/libs/sync/test/syncElectTest.cpp
@@ -98,7 +98,7 @@ int main(int argc, char** argv) {
   init();
   int32_t ret = syncIOStart((char*)"127.0.0.1", gPorts[myIndex]);
   assert(ret == 0);
-  ret = syncEnvStart();
+  ret = syncInit();
   assert(ret == 0);
 
   char walPath[128];
diff --git a/source/libs/sync/test/syncEncodeTest.cpp b/source/libs/sync/test/syncEncodeTest.cpp
index 9f1a81e7ed8c3805874ba36c9e9a696406dc8314..fdb5cf7ac89b885e4ff8a4a8d6ef2a83ebc57c1f 100644
--- a/source/libs/sync/test/syncEncodeTest.cpp
+++ b/source/libs/sync/test/syncEncodeTest.cpp
@@ -152,7 +152,7 @@ int main(int argc, char **argv) {
   int32_t ret = syncIOStart((char *)"127.0.0.1", ports[myIndex]);
   assert(ret == 0);
 
-  ret = syncEnvStart();
+  ret = syncInit();
   assert(ret == 0);
 
   taosRemoveDir("./wal_test");
diff --git a/source/libs/sync/test/syncEnqTest.cpp b/source/libs/sync/test/syncEnqTest.cpp
index 8461bfe9b7403c70d45a79f59474ad5d0ca43b2a..191e245b1e26e6cefc85a2bab6529a1601823275 100644
--- a/source/libs/sync/test/syncEnqTest.cpp
+++ b/source/libs/sync/test/syncEnqTest.cpp
@@ -81,7 +81,7 @@ int main(int argc, char** argv) {
   int32_t ret = syncIOStart((char*)"127.0.0.1", ports[myIndex]);
   assert(ret == 0);
 
-  ret = syncEnvStart();
+  ret = syncInit();
   assert(ret == 0);
 
   SSyncNode* pSyncNode = syncInitTest();
diff --git a/source/libs/sync/test/syncEnvTest.cpp b/source/libs/sync/test/syncEnvTest.cpp
index a7a819e0465b34de466c132934bc2b4c209b2fd1..404ab32d582c3347720bc6997fa154be82c521c0 100644
--- a/source/libs/sync/test/syncEnvTest.cpp
+++ b/source/libs/sync/test/syncEnvTest.cpp
@@ -22,7 +22,7 @@ int main() {
 
   logTest();
 
-  ret = syncEnvStart();
+  ret = syncInit();
   assert(ret == 0);
 
   for (int i = 0; i < 5; ++i) {
@@ -37,8 +37,6 @@ int main() {
     taosMsleep(5000);
   }
 
-  ret = syncEnvStop();
-  assert(ret == 0);
-
+  syncCleanUp();
   return 0;
 }
diff --git a/source/libs/sync/test/syncIOSendMsgTest.cpp b/source/libs/sync/test/syncIOSendMsgTest.cpp
index 630d96054bef043134b76233683551abe682bd6c..4a457136c2e924a0b70b891997b8da45e96f3775 100644
--- a/source/libs/sync/test/syncIOSendMsgTest.cpp
+++ b/source/libs/sync/test/syncIOSendMsgTest.cpp
@@ -82,7 +82,7 @@ int main(int argc, char** argv) {
   int32_t ret = syncIOStart((char*)"127.0.0.1", ports[myIndex]);
   assert(ret == 0);
 
-  ret = syncEnvStart();
+  ret = syncInit();
   assert(ret == 0);
 
   SSyncNode* pSyncNode = syncInitTest();
diff --git a/source/libs/sync/test/syncInitTest.cpp b/source/libs/sync/test/syncInitTest.cpp
index d0843151f4b3b04c2c67d44b4cdce3a48e78d6d8..d654ad06feb2a73132c4c1fe6f57f7465b619d23 100644
--- a/source/libs/sync/test/syncInitTest.cpp
+++ b/source/libs/sync/test/syncInitTest.cpp
@@ -81,7 +81,7 @@ int main(int argc, char** argv) {
   int32_t ret = syncIOStart((char*)"127.0.0.1", ports[myIndex]);
   assert(ret == 0);
 
-  ret = syncEnvStart();
+  ret = syncInit();
   assert(ret == 0);
 
   SSyncNode* pSyncNode = syncInitTest();
@@ -91,7 +91,7 @@ int main(int argc, char** argv) {
   initRaftId(pSyncNode);
 
   syncNodeClose(pSyncNode);
-  syncEnvStop();
+  syncCleanUp();
   // syncIOStop();
 
   // taosCloseLog();
diff --git a/source/libs/sync/test/syncPingSelfTest.cpp b/source/libs/sync/test/syncPingSelfTest.cpp
index 99287bf7b0fd23c350e7d5f8503b17efee641b7e..f44cbb04d51ac747b7737c8060cd0ba3b98aa921 100644
--- a/source/libs/sync/test/syncPingSelfTest.cpp
+++ b/source/libs/sync/test/syncPingSelfTest.cpp
@@ -81,7 +81,7 @@ int main(int argc, char** argv) {
   int32_t ret = syncIOStart((char*)"127.0.0.1", ports[myIndex]);
   assert(ret == 0);
 
-  ret = syncEnvStart();
+  ret = syncInit();
   assert(ret == 0);
 
   SSyncNode* pSyncNode = syncInitTest();
diff --git a/source/libs/sync/test/syncPingTimerTest.cpp b/source/libs/sync/test/syncPingTimerTest.cpp
index cd9440e3e280b71820ca5db8ed40bcc8b2c37d26..fd6342aa84c389ce9b5bd583eff9a56bffccb55e 100644
--- a/source/libs/sync/test/syncPingTimerTest.cpp
+++ b/source/libs/sync/test/syncPingTimerTest.cpp
@@ -81,7 +81,7 @@ int main(int argc, char** argv) {
   int32_t ret = syncIOStart((char*)"127.0.0.1", ports[myIndex]);
   assert(ret == 0);
 
-  ret = syncEnvStart();
+  ret = syncInit();
   assert(ret == 0);
 
   SSyncNode* pSyncNode = syncInitTest();
diff --git a/source/libs/sync/test/syncPingTimerTest2.cpp b/source/libs/sync/test/syncPingTimerTest2.cpp
index fa09d04368178e7b7ab6c94cd53c7672174bdf7b..295003dff3761237a9e8d2dd042457bb1b53d663 100644
--- a/source/libs/sync/test/syncPingTimerTest2.cpp
+++ b/source/libs/sync/test/syncPingTimerTest2.cpp
@@ -81,7 +81,7 @@ int main(int argc, char** argv) {
   int32_t ret = syncIOStart((char*)"127.0.0.1", ports[myIndex]);
   assert(ret == 0);
 
-  ret = syncEnvStart();
+  ret = syncInit();
   assert(ret == 0);
 
   SSyncNode* pSyncNode = syncInitTest();
diff --git a/source/libs/sync/test/syncSnapshotTest.cpp b/source/libs/sync/test/syncSnapshotTest.cpp
index 3dc85180728c4a287758156b47309e48a7cc01cd..50771ac476babe2565df792ddc87d74ca36d7b3c 100644
--- a/source/libs/sync/test/syncSnapshotTest.cpp
+++ b/source/libs/sync/test/syncSnapshotTest.cpp
@@ -179,7 +179,7 @@ int main(int argc, char **argv) {
   int32_t ret = syncIOStart((char *)"127.0.0.1", ports[myIndex]);
   assert(ret == 0);
 
-  ret = syncEnvStart();
+  ret = syncInit();
   assert(ret == 0);
 
   // taosRemoveDir(pWalDir);
diff --git a/source/libs/sync/test/syncVotesGrantedTest.cpp b/source/libs/sync/test/syncVotesGrantedTest.cpp
index d4885d0316b3a099f1b1e1c0bca45b4f1f471849..e2e8748697f22dfd2ad03302812dcfe41291984a 100644
--- a/source/libs/sync/test/syncVotesGrantedTest.cpp
+++ b/source/libs/sync/test/syncVotesGrantedTest.cpp
@@ -82,7 +82,7 @@ int main(int argc, char** argv) {
   int32_t ret = syncIOStart((char*)"127.0.0.1", ports[myIndex]);
   assert(ret == 0);
 
-  ret = syncEnvStart();
+  ret = syncInit();
   assert(ret == 0);
 
   SSyncNode* pSyncNode = syncInitTest();
diff --git a/source/libs/sync/test/syncVotesRespondTest.cpp b/source/libs/sync/test/syncVotesRespondTest.cpp
index 77262dfc65e0f134af75e8a11be674c40a1437ab..881a5331b13072f7c4e10f3ee12a161d72d2c4f9 100644
--- a/source/libs/sync/test/syncVotesRespondTest.cpp
+++ b/source/libs/sync/test/syncVotesRespondTest.cpp
@@ -82,7 +82,7 @@ int main(int argc, char** argv) {
   int32_t ret = syncIOStart((char*)"127.0.0.1", ports[myIndex]);
   assert(ret == 0);
 
-  ret = syncEnvStart();
+  ret = syncInit();
   assert(ret == 0);
 
   SSyncNode* pSyncNode = syncInitTest();
diff --git a/source/libs/sync/test/syncWriteTest.cpp b/source/libs/sync/test/syncWriteTest.cpp
index b185f52f7547d1a60541177f3a7374f3ed694081..fee98ddd52c33192efb4bdc6d0c707269f3c0743 100644
--- a/source/libs/sync/test/syncWriteTest.cpp
+++ b/source/libs/sync/test/syncWriteTest.cpp
@@ -154,7 +154,7 @@ int main(int argc, char **argv) {
   int32_t ret = syncIOStart((char *)"127.0.0.1", ports[myIndex]);
   assert(ret == 0);
 
-  ret = syncEnvStart();
+  ret = syncInit();
   assert(ret == 0);
 
   taosRemoveDir("./wal_test");
diff --git a/source/util/src/tref.c b/source/util/src/tref.c
index c984ef3f34dd50b669acf12f14233d6f7374f3b5..aa741b909aac146a4b073ad04aac03a4e21fab5a 100644
--- a/source/util/src/tref.c
+++ b/source/util/src/tref.c
@@ -57,7 +57,7 @@ static void    taosIncRsetCount(SRefSet *pSet);
 static void    taosDecRsetCount(SRefSet *pSet);
 static int32_t taosDecRefCount(int32_t rsetId, int64_t rid, int32_t remove);
 
-int32_t taosOpenRef(int32_t max, void (*fp)(void *)) {
+int32_t taosOpenRef(int32_t max, RefFp fp) {
   SRefNode **nodeList;
   SRefSet   *pSet;
   int64_t   *lockedBy;