diff --git a/include/libs/monitor/monitor.h b/include/libs/monitor/monitor.h
index 0041f3ac5fdb42ad7ac9337e32be265fa8a541ac..1695edd98375685ad735a85cca9947c65561ea33 100644
--- a/include/libs/monitor/monitor.h
+++ b/include/libs/monitor/monitor.h
@@ -86,21 +86,21 @@ typedef struct {
 
 typedef struct {
   float   uptime;  // day
-  float   cpu_engine;
-  float   cpu_system;
+  double  cpu_engine;
+  double  cpu_system;
   float   cpu_cores;
-  int64_t mem_engine;     // KB
-  int64_t mem_system;     // KB
-  int64_t mem_total;      // KB
-  float   disk_engine;    // GB
-  float   disk_used;      // GB
-  float   disk_total;     // GB
-  int64_t net_in;
-  int64_t net_out;
-  float   io_read;
-  float   io_write;
-  float   io_read_disk;
-  float   io_write_disk;
+  int64_t mem_engine;   // KB
+  int64_t mem_system;   // KB
+  int64_t mem_total;    // KB
+  int64_t disk_engine;  // Byte
+  int64_t disk_used;    // Byte
+  int64_t disk_total;   // Byte
+  double  net_in;       // bytes per second
+  double  net_out;      // bytes per second
+  double  io_read;
+  double  io_write;
+  double  io_read_disk;
+  double  io_write_disk;
   int32_t req_select;
   float   req_select_rate;
   int32_t req_insert;
diff --git a/include/libs/sync/sync.h b/include/libs/sync/sync.h
index 23e3ef752569c5beca0b603c7b13cabf924bbd7b..fddf18c571f2c54f0cb9c79b98a4a173a4c55066 100644
--- a/include/libs/sync/sync.h
+++ b/include/libs/sync/sync.h
@@ -138,6 +138,8 @@ typedef struct SSyncInfo {
 
   void* rpcClient;
   int32_t (*FpSendMsg)(void* rpcClient, const SEpSet* pEpSet, SRpcMsg* pMsg);
+  void* queue;
+  int32_t (*FpEqMsg)(void* queue, SRpcMsg* pMsg);
 
 } SSyncInfo;
 
@@ -147,13 +149,10 @@ typedef struct SSyncNode SSyncNode;
 int32_t syncInit();
 void    syncCleanUp();
 
-int64_t syncStart(const SSyncInfo* pSyncInfo);
-void    syncStop(int64_t rid);
-int32_t syncReconfig(int64_t rid, const SSyncCfg* pSyncCfg);
-
-int32_t syncForwardToPeer(int64_t rid, const SRpcMsg* pBuf, bool isWeak);
-// int32_t syncForwardToPeer(int64_t rid, const SSyncBuffer* pBuf, bool isWeak);
-
+int64_t    syncStart(const SSyncInfo* pSyncInfo);
+void       syncStop(int64_t rid);
+int32_t    syncReconfig(int64_t rid, const SSyncCfg* pSyncCfg);
+int32_t    syncForwardToPeer(int64_t rid, const SRpcMsg* pBuf, bool isWeak);
 ESyncState syncGetMyRole(int64_t rid);
 void       syncGetNodesRole(int64_t rid, SNodesRole* pNodeRole);
 
diff --git a/include/os/osSysinfo.h b/include/os/osSysinfo.h
index e14dba8269c7ddd8573f5a43e4dad29da23f1665..9081fa9715390530fed9463f7df98b15446be798 100644
--- a/include/os/osSysinfo.h
+++ b/include/os/osSysinfo.h
@@ -38,15 +38,15 @@ int32_t taosGetEmail(char *email, int32_t maxLen);
 int32_t taosGetOsReleaseName(char *releaseName, int32_t maxLen);
 int32_t taosGetCpuInfo(char *cpuModel, int32_t maxLen, float *numOfCores);
 int32_t taosGetCpuCores(float *numOfCores);
-int32_t taosGetCpuUsage(float *cpu_system, float *cpu_engine);
+int32_t taosGetCpuUsage(double *cpu_system, double *cpu_engine);
 int32_t taosGetTotalMemory(int64_t *totalKB);
 int32_t taosGetProcMemory(int64_t *usedKB);
 int32_t taosGetSysMemory(int64_t *usedKB);
 int32_t taosGetDiskSize(char *dataDir, SDiskSize *diskSize);
-int32_t taosReadProcIO(int64_t *rchars, int64_t *wchars);
-int32_t taosGetProcIO(float *readKB, float *writeKB);
-int32_t taosGetCardInfo(int64_t *bytes, int64_t *rbytes, int64_t *tbytes);
-int32_t taosGetBandSpeed(float *bandSpeedKb);
+int32_t taosReadProcIO(int64_t *rchars, int64_t *wchars, int64_t *read_bytes, int64_t *write_bytes);
+int32_t taosGetIOSpeed(double *readKB, double *writeKB, double *readDiskKB, double *writeDiskKB);
+int32_t taosGetCardInfo(int64_t *receive_bytes, int64_t *transmit_bytes);
+int32_t taosGetBandSpeed(double *receive_bytes_per_sec, double *transmit_bytes_per_sec);
 
 int32_t taosSystem(const char *cmd);
 void    taosKillSystem();
diff --git a/source/dnode/mgmt/impl/inc/dndEnv.h b/source/dnode/mgmt/impl/inc/dndEnv.h
index efe54ee1e592a0d4f7d582088b4b4a08086ff96d..b9acbea02f14515d93ecb753821d03b9928401da 100644
--- a/source/dnode/mgmt/impl/inc/dndEnv.h
+++ b/source/dnode/mgmt/impl/inc/dndEnv.h
@@ -108,6 +108,7 @@ typedef struct {
   SHashObj    *hash;
   int32_t      openVnodes;
   int32_t      totalVnodes;
+  int32_t      masterNum;
   SRWLatch     latch;
   SQWorkerPool queryPool;
   SFWorkerPool fetchPool;
diff --git a/source/dnode/mgmt/impl/src/dndMgmt.c b/source/dnode/mgmt/impl/src/dndMgmt.c
index 60cfdc299c21ce25f574162b06730bc61e2207a9..ff9eb5d884eefe439c5b3a2a3d90ab6f5c630e6e 100644
--- a/source/dnode/mgmt/impl/src/dndMgmt.c
+++ b/source/dnode/mgmt/impl/src/dndMgmt.c
@@ -487,12 +487,10 @@ static void dndGetMonitorDnodeInfo(SDnode *pDnode, SMonDnodeInfo *pInfo) {
   taosGetSysMemory(&pInfo->mem_system);
   pInfo->mem_total = tsTotalMemoryKB;
   pInfo->disk_engine = 0;
-  pInfo->disk_used = tsDataSpace.size.used / (1024 * 1024 * 1024.0);
-  pInfo->disk_total = tsDataSpace.size.avail / (1024 * 1024 * 1024.0);
-  taosGetCardInfo(NULL, &pInfo->net_in, &pInfo->net_out);
-  taosGetProcIO(&pInfo->io_read, &pInfo->io_write);
-  pInfo->io_read_disk = 0;
-  pInfo->io_write_disk = 0;
+  pInfo->disk_used = tsDataSpace.size.used;
+  pInfo->disk_total = tsDataSpace.size.total;
+  taosGetBandSpeed(&pInfo->net_in, &pInfo->net_out);
+  taosGetIOSpeed(&pInfo->io_read, &pInfo->io_write, &pInfo->io_read_disk, &pInfo->io_write_disk);
   pInfo->req_select = 0;
   pInfo->req_select_rate = 0;
   pInfo->req_insert = 0;
@@ -501,9 +499,9 @@ static void dndGetMonitorDnodeInfo(SDnode *pDnode, SMonDnodeInfo *pInfo) {
   pInfo->req_insert_batch = 0;
   pInfo->req_insert_batch_success = 0;
   pInfo->req_insert_batch_rate = 0;
-  pInfo->errors = 0;
-  pInfo->vnodes_num = 0;
-  pInfo->masters = 0;
+  pInfo->errors = tsNumOfErrorLogs;
+  pInfo->vnodes_num = pDnode->vmgmt.totalVnodes;
+  pInfo->masters = pDnode->vmgmt.masterNum;
   pInfo->has_mnode = dndIsMnode(pDnode);
 }
 
diff --git a/source/dnode/mgmt/impl/src/dndVnodes.c b/source/dnode/mgmt/impl/src/dndVnodes.c
index 1c7bac4b6b4754821f2ecb11fd238dc99d97e772..28bc615abab0562dab86301977b6dc5c55f2601f 100644
--- a/source/dnode/mgmt/impl/src/dndVnodes.c
+++ b/source/dnode/mgmt/impl/src/dndVnodes.c
@@ -17,6 +17,7 @@
 #include "dndVnodes.h"
 #include "dndMgmt.h"
 #include "dndTransport.h"
+#include "sync.h"
 
 typedef struct {
   int32_t  vgId;
@@ -979,6 +980,8 @@ void dndCleanupVnodes(SDnode *pDnode) {
 
 void dndGetVnodeLoads(SDnode *pDnode, SArray *pLoads) {
   SVnodesMgmt *pMgmt = &pDnode->vmgmt;
+  int32_t      totalVnodes = 0;
+  int32_t      masterNum = 0;
 
   taosRLockLatch(&pMgmt->latch);
 
@@ -993,8 +996,12 @@ void dndGetVnodeLoads(SDnode *pDnode, SArray *pLoads) {
     vnodeGetLoad(pVnode->pImpl, &vload);
     taosArrayPush(pLoads, &vload);
 
+    totalVnodes++;
+    if (vload.role == TAOS_SYNC_STATE_LEADER) masterNum++;
     pIter = taosHashIterate(pMgmt->hash, pIter);
   }
 
   taosRUnLockLatch(&pMgmt->latch);
+  pMgmt->totalVnodes = totalVnodes;
+  pMgmt->masterNum = masterNum;
 }
diff --git a/source/libs/index/src/index.c b/source/libs/index/src/index.c
index 57e965a753c08ca323a364d2ac016209ddf4045d..75dc05fc5b8cfdf254eebf9383723f82a3507bed 100644
--- a/source/libs/index/src/index.c
+++ b/source/libs/index/src/index.c
@@ -16,6 +16,7 @@
 #include "index.h"
 #include "indexInt.h"
 #include "index_cache.h"
+#include "index_comm.h"
 #include "index_tfile.h"
 #include "index_util.h"
 #include "tdef.h"
@@ -30,8 +31,6 @@
 
 void* indexQhandle = NULL;
 
-static char JSON_COLUMN[] = "JSON";
-
 #define INDEX_MERGE_ADD_DEL(src, dst, tgt)            \
   {                                                   \
     bool f = false;                                   \
@@ -64,13 +63,11 @@ typedef struct SIdxColInfo {
   int cVersion;
 } SIdxColInfo;
 
-typedef struct SIdxMergeHelper {
-  char*   colVal;
+typedef struct SIdxTempResult {
   SArray* total;
   SArray* added;
   SArray* deled;
-  bool    reset;
-} SIdxMergeHelper;
+} SIdxTempResult;
 
 static pthread_once_t isInit = PTHREAD_ONCE_INIT;
 // static void           indexInit();
@@ -82,8 +79,7 @@ static int  indexMergeFinalResults(SArray* interResults, EIndexOperatorType oTyp
 static int indexGenTFile(SIndex* index, IndexCache* cache, SArray* batch);
 
 // merge cache and tfile by opera type
-static void indexMergeCacheAndTFile(SArray* result, IterateValue* icache, IterateValue* iTfv, SIdxMergeHelper* helper);
-static void indexMergeSameKey(SArray* result, TFileValue* tv, SIdxMergeHelper* helper);
+static void indexMergeCacheAndTFile(SArray* result, IterateValue* icache, IterateValue* iTfv, SIdxTempResult* helper);
 
 // static int32_t indexSerialTermKey(SIndexTerm* itm, char* buf);
 // int32_t        indexSerialKey(ICacheKey* key, char* buf);
@@ -399,7 +395,6 @@ static void indexInterResultsDestroy(SArray* results) {
 
 static int indexMergeFinalResults(SArray* interResults, EIndexOperatorType oType, SArray* fResults) {
   // refactor, merge interResults into fResults by oType
-
   for (int i = 0; i < taosArrayGetSize(interResults); i--) {
     SArray* t = taosArrayGetP(interResults, i);
     taosArraySort(t, uidCompare);
@@ -418,98 +413,82 @@ static int indexMergeFinalResults(SArray* interResults, EIndexOperatorType oType
   return 0;
 }
 
-SIdxMergeHelper* sIdxMergeHelperCreate() {
-  SIdxMergeHelper* hp = calloc(1, sizeof(SIdxMergeHelper));
-  hp->total = taosArrayInit(4, sizeof(uint64_t));
-  hp->added = taosArrayInit(4, sizeof(uint64_t));
-  hp->deled = taosArrayInit(4, sizeof(uint64_t));
-  hp->reset = false;
-  return hp;
+SIdxTempResult* sIdxTempResultCreate() {
+  SIdxTempResult* tr = calloc(1, sizeof(SIdxTempResult));
+  tr->total = taosArrayInit(4, sizeof(uint64_t));
+  tr->added = taosArrayInit(4, sizeof(uint64_t));
+  tr->deled = taosArrayInit(4, sizeof(uint64_t));
+  return tr;
 }
-void sIdxMergeHelperClear(SIdxMergeHelper* hp) {
-  if (hp == NULL) {
+void sIdxTempResultClear(SIdxTempResult* tr) {
+  if (tr == NULL) {
     return;
   }
-  hp->reset = false;
-  taosArrayClear(hp->total);
-  taosArrayClear(hp->added);
-  taosArrayClear(hp->deled);
+  taosArrayClear(tr->total);
+  taosArrayClear(tr->added);
+  taosArrayClear(tr->deled);
 }
-void sIdxMergeHelperDestroy(SIdxMergeHelper* hp) {
-  if (hp == NULL) {
+void sIdxTempResultDestroy(SIdxTempResult* tr) {
+  if (tr == NULL) {
     return;
   }
-  taosArrayDestroy(hp->total);
-  taosArrayDestroy(hp->added);
-  taosArrayDestroy(hp->deled);
+  taosArrayDestroy(tr->total);
+  taosArrayDestroy(tr->added);
+  taosArrayDestroy(tr->deled);
 }
-static void indexMergeSameKey(SArray* result, TFileValue* tv, SIdxMergeHelper* helper) {
-  int32_t sz = result ? taosArrayGetSize(result) : 0;
-  if (sz > 0) {
-    // TODO(yihao): remove duplicate tableid
-    TFileValue* lv = taosArrayGetP(result, sz - 1);
-    // indexError("merge colVal: %s", lv->colVal);
-    if (strcmp(lv->colVal, tv->colVal) == 0) {
-      taosArrayAddAll(lv->tableId, tv->tableId);
-      tfileValueDestroy(tv);
-    } else {
-      taosArrayPush(result, &tv);
-    }
-  } else {
-    taosArrayPush(result, &tv);
-  }
-}
-static void sIdxMergeResult(SArray* result, SIdxMergeHelper* mh) {
-  taosArraySort(mh->total, uidCompare);
-  taosArraySort(mh->added, uidCompare);
-  taosArraySort(mh->deled, uidCompare);
+static void sIdxTempResultMergeTo(SArray* result, SIdxTempResult* tr) {
+  taosArraySort(tr->total, uidCompare);
+  taosArraySort(tr->added, uidCompare);
+  taosArraySort(tr->deled, uidCompare);
 
   SArray* arrs = taosArrayInit(2, sizeof(void*));
-  taosArrayPush(arrs, &mh->total);
-  taosArrayPush(arrs, &mh->added);
+  taosArrayPush(arrs, &tr->total);
+  taosArrayPush(arrs, &tr->added);
 
   iUnion(arrs, result);
   taosArrayDestroy(arrs);
 
-  iExcept(result, mh->deled);
+  iExcept(result, tr->deled);
 }
-static void indexMayMergeToFinalResult(SArray* result, TFileValue* tfv, SIdxMergeHelper* help) {
+static void indexMayMergeTempToFinalResult(SArray* result, TFileValue* tfv, SIdxTempResult* tr) {
   int32_t sz = taosArrayGetSize(result);
   if (sz > 0) {
     TFileValue* lv = taosArrayGetP(result, sz - 1);
     if (tfv != NULL && strcmp(lv->colVal, tfv->colVal) != 0) {
-      sIdxMergeResult(lv->tableId, help);
-      sIdxMergeHelperClear(help);
+      sIdxTempResultMergeTo(lv->tableId, tr);
+      sIdxTempResultClear(tr);
 
       taosArrayPush(result, &tfv);
     } else if (tfv == NULL) {
-      sIdxMergeResult(lv->tableId, help);
+      // handle last iterator
+      sIdxTempResultMergeTo(lv->tableId, tr);
     } else {
+      // temp result saved in help
       tfileValueDestroy(tfv);
     }
   } else {
     taosArrayPush(result, &tfv);
   }
 }
-static void indexMergeCacheAndTFile(SArray* result, IterateValue* cv, IterateValue* tv, SIdxMergeHelper* mh) {
+static void indexMergeCacheAndTFile(SArray* result, IterateValue* cv, IterateValue* tv, SIdxTempResult* tr) {
   char*       colVal = (cv != NULL) ? cv->colVal : tv->colVal;
   TFileValue* tfv = tfileValueCreate(colVal);
 
-  indexMayMergeToFinalResult(result, tfv, mh);
+  indexMayMergeTempToFinalResult(result, tfv, tr);
 
   if (cv != NULL) {
     uint64_t id = *(uint64_t*)taosArrayGet(cv->val, 0);
     if (cv->type == ADD_VALUE) {
-      INDEX_MERGE_ADD_DEL(mh->deled, mh->added, id)
+      INDEX_MERGE_ADD_DEL(tr->deled, tr->added, id)
     } else if (cv->type == DEL_VALUE) {
-      INDEX_MERGE_ADD_DEL(mh->added, mh->deled, id)
+      INDEX_MERGE_ADD_DEL(tr->added, tr->deled, id)
     }
   }
   if (tv != NULL) {
-    taosArrayAddAll(mh->total, tv->val);
+    taosArrayAddAll(tr->total, tv->val);
   }
 }
-static void indexDestroyTempResult(SArray* result) {
+static void indexDestroyFinalResult(SArray* result) {
   int32_t sz = result ? taosArrayGetSize(result) : 0;
   for (size_t i = 0; i < sz; i++) {
     TFileValue* tv = taosArrayGetP(result, i);
@@ -543,7 +522,7 @@ int indexFlushCacheToTFile(SIndex* sIdx, void* cache) {
   bool cn = cacheIter ? cacheIter->next(cacheIter) : false;
   bool tn = tfileIter ? tfileIter->next(tfileIter) : false;
 
-  SIdxMergeHelper* help = sIdxMergeHelperCreate();
+  SIdxTempResult* tr = sIdxTempResultCreate();
   while (cn == true || tn == true) {
     IterateValue* cv = (cn == true) ? cacheIter->getValue(cacheIter) : NULL;
     IterateValue* tv = (tn == true) ? tfileIter->getValue(tfileIter) : NULL;
@@ -557,21 +536,22 @@ int indexFlushCacheToTFile(SIndex* sIdx, void* cache) {
       comp = 1;
     }
     if (comp == 0) {
-      indexMergeCacheAndTFile(result, cv, tv, help);
+      indexMergeCacheAndTFile(result, cv, tv, tr);
       cn = cacheIter->next(cacheIter);
       tn = tfileIter->next(tfileIter);
     } else if (comp < 0) {
-      indexMergeCacheAndTFile(result, cv, NULL, help);
+      indexMergeCacheAndTFile(result, cv, NULL, tr);
       cn = cacheIter->next(cacheIter);
     } else {
-      indexMergeCacheAndTFile(result, NULL, tv, help);
+      indexMergeCacheAndTFile(result, NULL, tv, tr);
       tn = tfileIter->next(tfileIter);
     }
   }
-  indexMayMergeToFinalResult(result, NULL, help);
+  indexMayMergeTempToFinalResult(result, NULL, tr);
+  sIdxTempResultDestroy(tr);
 
   int ret = indexGenTFile(sIdx, pCache, result);
-  indexDestroyTempResult(result);
+  indexDestroyFinalResult(result);
 
   indexCacheDestroyImm(pCache);
 
@@ -581,8 +561,6 @@ int indexFlushCacheToTFile(SIndex* sIdx, void* cache) {
   tfileReaderUnRef(pReader);
   indexCacheUnRef(pCache);
 
-  sIdxMergeHelperDestroy(help);
-
   int64_t cost = taosGetTimestampUs() - st;
   if (ret != 0) {
     indexError("failed to merge, time cost: %" PRId64 "ms", cost / 1000);
diff --git a/source/libs/index/src/index_tfile.c b/source/libs/index/src/index_tfile.c
index 6cfc199afd7fefcef3267806989402bb62da324c..f5f46b061714fa372a2aa52607598cf69214990e 100644
--- a/source/libs/index/src/index_tfile.c
+++ b/source/libs/index/src/index_tfile.c
@@ -102,7 +102,6 @@ void tfileCacheDestroy(TFileCache* tcache) {
   if (tcache == NULL) {
     return;
   }
-
   // free table cache
   TFileReader** reader = taosHashIterate(tcache->tableCache, NULL);
   while (reader) {
diff --git a/source/libs/index/test/jsonUT.cc b/source/libs/index/test/jsonUT.cc
index e5c79d137f43cb7350396211d81c71ec734e3957..df9f8b8439db379e99cfc96b69ea150b7a51577a 100644
--- a/source/libs/index/test/jsonUT.cc
+++ b/source/libs/index/test/jsonUT.cc
@@ -105,6 +105,22 @@ TEST_F(JsonEnv, testWriteMillonData) {
     }
     indexMultiTermDestroy(terms);
   }
+  {
+    std::string colName("voltagefdadfa");
+    std::string colVal("abxxxxxxxxxxxx");
+    for (uint i = 0; i < 1000; i++) {
+      colVal[i % colVal.size()] = '0' + i % 128;
+      SIndexTerm* term = indexTermCreate(1, ADD_VALUE, TSDB_DATA_TYPE_BINARY, colName.c_str(), colName.size(),
+                                         colVal.c_str(), colVal.size());
+
+      SIndexMultiTerm* terms = indexMultiTermCreate();
+      indexMultiTermAdd(terms, term);
+      for (size_t i = 0; i < 1000; i++) {
+        tIndexJsonPut(index, terms, i);
+      }
+      indexMultiTermDestroy(terms);
+    }
+  }
   {
     std::string colName("voltagefdadfa");
     std::string colVal("abxxxxxxxxxxxx");
diff --git a/source/libs/sync/inc/syncElection.h b/source/libs/sync/inc/syncElection.h
index 7e9e637854f29f35650761e4411357099396d9d4..ed5b86fa98a78b38997ee45388ce2126cac908b8 100644
--- a/source/libs/sync/inc/syncElection.h
+++ b/source/libs/sync/inc/syncElection.h
@@ -26,6 +26,9 @@ extern "C" {
 #include "syncInt.h"
 #include "taosdef.h"
 
+void syncNodeElect(SSyncNode* pSyncNode);
+void syncNodeRequestVotePeers(SSyncNode* pSyncNode);
+
 #ifdef __cplusplus
 }
 #endif
diff --git a/source/libs/sync/inc/syncIO.h b/source/libs/sync/inc/syncIO.h
index 238948b403b58cf8142752507872b7b2fb856423..160fefd086cc7e4a0334e2156883da1ba5034046 100644
--- a/source/libs/sync/inc/syncIO.h
+++ b/source/libs/sync/inc/syncIO.h
@@ -49,6 +49,7 @@ typedef struct SSyncIO {
   int32_t (*FpOnSyncRequestVoteReply)(SSyncNode *pSyncNode, SyncRequestVoteReply *pMsg);
   int32_t (*FpOnSyncAppendEntries)(SSyncNode *pSyncNode, SyncAppendEntries *pMsg);
   int32_t (*FpOnSyncAppendEntriesReply)(SSyncNode *pSyncNode, SyncAppendEntriesReply *pMsg);
+  int32_t (*FpOnSyncTimeout)(SSyncNode *pSyncNode, SyncTimeout *pMsg);
 
   int8_t isStart;
 
@@ -58,9 +59,10 @@ extern SSyncIO *gSyncIO;
 
 int32_t syncIOStart(char *host, uint16_t port);
 int32_t syncIOStop();
-int32_t syncIOSendMsg(void *clientRpc, const SEpSet *pEpSet, SRpcMsg *pMsg);
 int32_t syncIOTickQ();
 int32_t syncIOTickPing();
+int32_t syncIOSendMsg(void *clientRpc, const SEpSet *pEpSet, SRpcMsg *pMsg);
+int32_t syncIOEqMsg(void *queue, SRpcMsg *pMsg);
 
 #ifdef __cplusplus
 }
diff --git a/source/libs/sync/inc/syncInt.h b/source/libs/sync/inc/syncInt.h
index e276bbd23495c7db8c94dad194dc0468b66e6721..15ed5503ebe7fe2e927826711a384deec611fb3c 100644
--- a/source/libs/sync/inc/syncInt.h
+++ b/source/libs/sync/inc/syncInt.h
@@ -69,6 +69,9 @@ extern "C" {
 struct SRaft;
 typedef struct SRaft SRaft;
 
+struct SyncTimeout;
+typedef struct SyncTimeout SyncTimeout;
+
 struct SyncPing;
 typedef struct SyncPing SyncPing;
 
@@ -111,17 +114,22 @@ typedef struct SSyncNode {
   char        path[TSDB_FILENAME_LEN];
   void*       rpcClient;
   int32_t (*FpSendMsg)(void* rpcClient, const SEpSet* pEpSet, SRpcMsg* pMsg);
+  void* queue;
+  int32_t (*FpEqMsg)(void* queue, SRpcMsg* pMsg);
 
   // init internal
   SNodeInfo me;
+  SRaftId   raftId;
+
   int32_t   peersNum;
   SNodeInfo peers[TSDB_MAX_REPLICA];
+  SRaftId   peersId[TSDB_MAX_REPLICA];
+
+  int32_t replicaNum;
+  SRaftId replicasId[TSDB_MAX_REPLICA];
 
   // raft algorithm
   SSyncFSM* pFsm;
-  SRaftId   raftId;
-  SRaftId   peersId[TSDB_MAX_REPLICA];
-  int32_t   replicaNum;
   int32_t   quorum;
 
   // life cycle
@@ -147,19 +155,19 @@ typedef struct SSyncNode {
   // timer
   tmr_h             pPingTimer;
   int32_t           pingTimerMS;
-  uint8_t           pingTimerStart;
+  uint8_t           pingTimerEnable;
   TAOS_TMR_CALLBACK FpPingTimer;  // Timer Fp
   uint64_t          pingTimerCounter;
 
   tmr_h             pElectTimer;
   int32_t           electTimerMS;
-  uint8_t           electTimerStart;
+  uint8_t           electTimerEnable;
   TAOS_TMR_CALLBACK FpElectTimer;  // Timer Fp
   uint64_t          electTimerCounter;
 
   tmr_h             pHeartbeatTimer;
   int32_t           heartbeatTimerMS;
-  uint8_t           heartbeatTimerStart;
+  uint8_t           heartbeatTimerEnable;
   TAOS_TMR_CALLBACK FpHeartbeatTimer;  // Timer Fp
   uint64_t          heartbeatTimerCounter;
 
@@ -170,6 +178,7 @@ typedef struct SSyncNode {
   int32_t (*FpOnRequestVoteReply)(SSyncNode* ths, SyncRequestVoteReply* pMsg);
   int32_t (*FpOnAppendEntries)(SSyncNode* ths, SyncAppendEntries* pMsg);
   int32_t (*FpOnAppendEntriesReply)(SSyncNode* ths, SyncAppendEntriesReply* pMsg);
+  int32_t (*FpOnTimeout)(SSyncNode* pSyncNode, SyncTimeout* pMsg);
 
 } SSyncNode;
 
@@ -178,8 +187,24 @@ void       syncNodeClose(SSyncNode* pSyncNode);
 void       syncNodePingAll(SSyncNode* pSyncNode);
 void       syncNodePingPeers(SSyncNode* pSyncNode);
 void       syncNodePingSelf(SSyncNode* pSyncNode);
-int32_t    syncNodeStartPingTimer(SSyncNode* pSyncNode);
-int32_t    syncNodeStopPingTimer(SSyncNode* pSyncNode);
+
+int32_t syncNodeStartPingTimer(SSyncNode* pSyncNode);
+int32_t syncNodeStopPingTimer(SSyncNode* pSyncNode);
+
+int32_t syncNodeStartElectTimer(SSyncNode* pSyncNode);
+int32_t syncNodeStopElectTimer(SSyncNode* pSyncNode);
+int32_t syncNodeResetElectTimer(SSyncNode* pSyncNode, int32_t ms);
+
+int32_t syncNodeStartHeartbeatTimer(SSyncNode* pSyncNode);
+int32_t syncNodeStopHeartbeatTimer(SSyncNode* pSyncNode);
+int32_t syncNodeResetHeartbeatTimer(SSyncNode* pSyncNode, int32_t ms);
+
+void syncNodeBecomeFollower(SSyncNode* pSyncNode);
+void syncNodeBecomeLeader(SSyncNode* pSyncNode);
+void syncNodeFollower2Candidate(SSyncNode* pSyncNode);
+void syncNodeCandidate2Leader(SSyncNode* pSyncNode);
+void syncNodeLeader2Follower(SSyncNode* pSyncNode);
+void syncNodeCandidate2Follower(SSyncNode* pSyncNode);
 
 #ifdef __cplusplus
 }
diff --git a/source/libs/sync/inc/syncMessage.h b/source/libs/sync/inc/syncMessage.h
index 3057e23bc23d5780161da5afcf8816a218ab9948..b022044528ccd241b53b6e1d37c629b843ce412e 100644
--- a/source/libs/sync/inc/syncMessage.h
+++ b/source/libs/sync/inc/syncMessage.h
@@ -30,6 +30,8 @@ extern "C" {
 
 // encode as uint32
 typedef enum ESyncMessageType {
+  SYNC_UNKNOWN = 77,
+  SYNC_TIMEOUT = 99,
   SYNC_PING = 101,
   SYNC_PING_REPLY = 103,
   SYNC_CLIENT_REQUEST = 105,
@@ -38,8 +40,37 @@ typedef enum ESyncMessageType {
   SYNC_REQUEST_VOTE_REPLY = 111,
   SYNC_APPEND_ENTRIES = 113,
   SYNC_APPEND_ENTRIES_REPLY = 115,
+
 } ESyncMessageType;
 
+// ---------------------------------------------
+cJSON* syncRpcMsg2Json(SRpcMsg* pRpcMsg);
+cJSON* syncRpcUnknownMsg2Json();
+
+// ---------------------------------------------
+typedef enum ESyncTimeoutType {
+  SYNC_TIMEOUT_PING = 100,
+  SYNC_TIMEOUT_ELECTION,
+  SYNC_TIMEOUT_HEARTBEAT,
+
+} ESyncTimeoutType;
+
+typedef struct SyncTimeout {
+  uint32_t         bytes;
+  uint32_t         msgType;
+  ESyncTimeoutType timeoutType;
+  void*            data;
+} SyncTimeout;
+
+SyncTimeout* syncTimeoutBuild();
+void         syncTimeoutDestroy(SyncTimeout* pMsg);
+void         syncTimeoutSerialize(const SyncTimeout* pMsg, char* buf, uint32_t bufLen);
+void         syncTimeoutDeserialize(const char* buf, uint32_t len, SyncTimeout* pMsg);
+void         syncTimeout2RpcMsg(const SyncTimeout* pMsg, SRpcMsg* pRpcMsg);
+void         syncTimeoutFromRpcMsg(const SRpcMsg* pRpcMsg, SyncTimeout* pMsg);
+cJSON*       syncTimeout2Json(const SyncTimeout* pMsg);
+SyncTimeout* syncTimeoutBuild2(ESyncTimeoutType timeoutType, void* data);
+
 // ---------------------------------------------
 typedef struct SyncPing {
   uint32_t bytes;
diff --git a/source/libs/sync/inc/syncReplication.h b/source/libs/sync/inc/syncReplication.h
index 7f97ae9e49cb516dbbc04f082a4068165208bd6b..a9875d5caeb6fcfac97de9b18e06d5df1c5fa2fd 100644
--- a/source/libs/sync/inc/syncReplication.h
+++ b/source/libs/sync/inc/syncReplication.h
@@ -26,6 +26,8 @@ extern "C" {
 #include "syncInt.h"
 #include "taosdef.h"
 
+void syncNodeAppendEntriesPeers(SSyncNode* pSyncNode);
+
 #ifdef __cplusplus
 }
 #endif
diff --git a/source/libs/sync/inc/syncUtil.h b/source/libs/sync/inc/syncUtil.h
index 93d2c125254766ccfdd881a8afafd303b45f91fb..e1078d57387234e9be84cb9e30707dea4f6f7423 100644
--- a/source/libs/sync/inc/syncUtil.h
+++ b/source/libs/sync/inc/syncUtil.h
@@ -39,8 +39,9 @@ void syncUtilraftId2EpSet(const SRaftId* raftId, SEpSet* pEpSet);
 
 void syncUtilnodeInfo2raftId(const SNodeInfo* pNodeInfo, SyncGroupId vgId, SRaftId* raftId);
 
+bool syncUtilSameId(const SRaftId* pId1, const SRaftId* pId2);
+
 // ---- SSyncBuffer ----
-#if 0
 void syncUtilbufBuild(SSyncBuffer* syncBuf, size_t len);
 
 void syncUtilbufDestroy(SSyncBuffer* syncBuf);
@@ -48,7 +49,6 @@ void syncUtilbufDestroy(SSyncBuffer* syncBuf);
 void syncUtilbufCopy(const SSyncBuffer* src, SSyncBuffer* dest);
 
 void syncUtilbufCopyDeep(const SSyncBuffer* src, SSyncBuffer* dest);
-#endif
 
 #ifdef __cplusplus
 }
diff --git a/source/libs/sync/inc/syncVoteMgr.h b/source/libs/sync/inc/syncVoteMgr.h
index b841f2e3163816759d10d2a41454232f326b0fbb..e2307e9e665a7525369d96027dc98a2d8014128f 100644
--- a/source/libs/sync/inc/syncVoteMgr.h
+++ b/source/libs/sync/inc/syncVoteMgr.h
@@ -24,13 +24,36 @@ extern "C" {
 #include <stdio.h>
 #include <stdlib.h>
 #include "syncInt.h"
+#include "syncMessage.h"
+#include "syncUtil.h"
 #include "taosdef.h"
 
 typedef struct SVotesGranted {
+  SyncTerm   term;
+  int32_t    quorum;
+  int32_t    votes;
+  bool       toLeader;
+  SSyncNode *pSyncNode;
 } SVotesGranted;
 
-typedef struct SVotesResponded {
-} SVotesResponded;
+SVotesGranted *voteGrantedCreate(SSyncNode *pSyncNode);
+void           voteGrantedDestroy(SVotesGranted *pVotesGranted);
+bool           voteGrantedMajority(SVotesGranted *pVotesGranted);
+void           voteGrantedVote(SVotesGranted *pVotesGranted, SyncRequestVoteReply *pMsg);
+void           voteGrantedReset(SVotesGranted *pVotesGranted, SyncTerm term);
+
+typedef struct SVotesRespond {
+  SRaftId (*replicas)[TSDB_MAX_REPLICA];
+  bool       isRespond[TSDB_MAX_REPLICA];
+  int32_t    replicaNum;
+  SyncTerm   term;
+  SSyncNode *pSyncNode;
+} SVotesRespond;
+
+SVotesRespond *votesRespondCreate(SSyncNode *pSyncNode);
+bool           votesResponded(SVotesRespond *pVotesRespond, const SRaftId *pRaftId);
+void           votesRespondAdd(SVotesRespond *pVotesRespond, const SyncRequestVoteReply *pMsg);
+void           Reset(SVotesRespond *pVotesRespond, SyncTerm term);
 
 #ifdef __cplusplus
 }
diff --git a/source/libs/sync/src/syncElection.c b/source/libs/sync/src/syncElection.c
index 329105e2a1214aba3cfb1bce2850f292f85811b8..433201b849aae039b9e9557054b41e3d7b853fec 100644
--- a/source/libs/sync/src/syncElection.c
+++ b/source/libs/sync/src/syncElection.c
@@ -14,3 +14,7 @@
  */
 
 #include "syncElection.h"
+
+void syncNodeElect(SSyncNode* pSyncNode) {}
+
+void syncNodeRequestVotePeers(SSyncNode* pSyncNode) {}
\ No newline at end of file
diff --git a/source/libs/sync/src/syncIO.c b/source/libs/sync/src/syncIO.c
index 757718282a507e68c5772642ed6043c4188ae7a5..25775bec7634a4ec93317e3a6f038b6fc3a3c735 100644
--- a/source/libs/sync/src/syncIO.c
+++ b/source/libs/sync/src/syncIO.c
@@ -40,17 +40,6 @@ static void    syncIOTickPingFunc(void *param, void *tmrId);
 // ----------------------------
 
 // public function ------------
-int32_t syncIOSendMsg(void *clientRpc, const SEpSet *pEpSet, SRpcMsg *pMsg) {
-  sTrace(
-      "<--- syncIOSendMsg ---> clientRpc:%p, numOfEps:%d, inUse:%d, destAddr:%s-%u, pMsg->ahandle:%p, pMsg->handle:%p, "
-      "pMsg->msgType:%d, pMsg->contLen:%d",
-      clientRpc, pEpSet->numOfEps, pEpSet->inUse, pEpSet->eps[0].fqdn, pEpSet->eps[0].port, pMsg->ahandle, pMsg->handle,
-      pMsg->msgType, pMsg->contLen);
-  pMsg->handle = NULL;
-  rpcSendRequest(clientRpc, pEpSet, pMsg, NULL);
-  return 0;
-}
-
 int32_t syncIOStart(char *host, uint16_t port) {
   gSyncIO = syncIOCreate(host, port);
   assert(gSyncIO != NULL);
@@ -83,6 +72,35 @@ int32_t syncIOTickPing() {
   return ret;
 }
 
+int32_t syncIOSendMsg(void *clientRpc, const SEpSet *pEpSet, SRpcMsg *pMsg) {
+  sTrace(
+      "<--- syncIOSendMsg ---> clientRpc:%p, numOfEps:%d, inUse:%d, destAddr:%s-%u, pMsg->ahandle:%p, pMsg->handle:%p, "
+      "pMsg->msgType:%d, pMsg->contLen:%d",
+      clientRpc, pEpSet->numOfEps, pEpSet->inUse, pEpSet->eps[0].fqdn, pEpSet->eps[0].port, pMsg->ahandle, pMsg->handle,
+      pMsg->msgType, pMsg->contLen);
+  {
+    cJSON *pJson = syncRpcMsg2Json(pMsg);
+    char  *serialized = cJSON_Print(pJson);
+    sTrace("process syncMessage send: pMsg:%s ", serialized);
+    free(serialized);
+    cJSON_Delete(pJson);
+  }
+  pMsg->handle = NULL;
+  rpcSendRequest(clientRpc, pEpSet, pMsg, NULL);
+  return 0;
+}
+
+int32_t syncIOEqMsg(void *queue, SRpcMsg *pMsg) {
+  SRpcMsg *pTemp;
+  pTemp = taosAllocateQitem(sizeof(SRpcMsg));
+  memcpy(pTemp, pMsg, sizeof(SRpcMsg));
+
+  STaosQueue *pMsgQ = queue;
+  taosWriteQitem(pMsgQ, pTemp);
+
+  return 0;
+}
+
 // local function ------------
 static int32_t syncIOStartInternal(SSyncIO *io) {
   taosBlockSIGPIPE();
@@ -193,7 +211,7 @@ static void *syncIOConsumerFunc(void *param) {
   SSyncIO *io = param;
 
   STaosQall *qall;
-  SRpcMsg *  pRpcMsg, rpcMsg;
+  SRpcMsg   *pRpcMsg, rpcMsg;
   int        type;
 
   qall = taosAllocateQall();
@@ -215,6 +233,7 @@ static void *syncIOConsumerFunc(void *param) {
           syncPingFromRpcMsg(pRpcMsg, pSyncMsg);
           // memcpy(pSyncMsg, tmpRpcMsg.pCont, tmpRpcMsg.contLen);
           io->FpOnSyncPing(io->pSyncNode, pSyncMsg);
+          syncPingDestroy(pSyncMsg);
         }
 
       } else if (pRpcMsg->msgType == SYNC_PING_REPLY) {
@@ -223,6 +242,16 @@ static void *syncIOConsumerFunc(void *param) {
           pSyncMsg = syncPingReplyBuild(pRpcMsg->contLen);
           syncPingReplyFromRpcMsg(pRpcMsg, pSyncMsg);
           io->FpOnSyncPingReply(io->pSyncNode, pSyncMsg);
+          syncPingReplyDestroy(pSyncMsg);
+        }
+
+      } else if (pRpcMsg->msgType == SYNC_TIMEOUT) {
+        if (io->FpOnSyncTimeout != NULL) {
+          SyncTimeout *pSyncMsg;
+          pSyncMsg = syncTimeoutBuild();
+          syncTimeoutFromRpcMsg(pRpcMsg, pSyncMsg);
+          io->FpOnSyncTimeout(io->pSyncNode, pSyncMsg);
+          syncTimeoutDestroy(pSyncMsg);
         }
       } else {
         ;
diff --git a/source/libs/sync/src/syncMain.c b/source/libs/sync/src/syncMain.c
index 7e01e7e81c2251ef603d29c07734518a53d1467f..6a0663dd579cb14dbabf20fcaa1bdce89ddeda2f 100644
--- a/source/libs/sync/src/syncMain.c
+++ b/source/libs/sync/src/syncMain.c
@@ -25,7 +25,10 @@ static int32_t tsNodeRefId = -1;
 // ------ local funciton ---------
 static int32_t syncNodeSendMsgById(const SRaftId* destRaftId, SSyncNode* pSyncNode, SRpcMsg* pMsg);
 static int32_t syncNodeSendMsgByInfo(const SNodeInfo* nodeInfo, SSyncNode* pSyncNode, SRpcMsg* pMsg);
-static void    syncNodePingTimerCb(void* param, void* tmrId);
+
+static void syncNodeEqPingTimer(void* param, void* tmrId);
+static void syncNodeEqElectTimer(void* param, void* tmrId);
+static void syncNodeEqHeartbeatTimer(void* param, void* tmrId);
 
 static int32_t syncNodePing(SSyncNode* pSyncNode, const SRaftId* destRaftId, SyncPing* pMsg);
 static int32_t syncNodeRequestVote(SSyncNode* ths, const SyncRequestVote* pMsg);
@@ -37,6 +40,7 @@ static int32_t syncNodeOnRequestVoteCb(SSyncNode* ths, SyncRequestVote* pMsg);
 static int32_t syncNodeOnRequestVoteReplyCb(SSyncNode* ths, SyncRequestVoteReply* pMsg);
 static int32_t syncNodeOnAppendEntriesCb(SSyncNode* ths, SyncAppendEntries* pMsg);
 static int32_t syncNodeOnAppendEntriesReplyCb(SSyncNode* ths, SyncAppendEntriesReply* pMsg);
+static int32_t syncNodeOnTimeoutCb(SSyncNode* ths, SyncTimeout* pMsg);
 // ---------------------------------
 
 int32_t syncInit() {
@@ -56,8 +60,6 @@ void syncStop(int64_t rid) {}
 
 int32_t syncReconfig(int64_t rid, const SSyncCfg* pSyncCfg) { return 0; }
 
-// int32_t syncForwardToPeer(int64_t rid, const SSyncBuffer* pBuf, bool isWeak) { return 0; }
-
 int32_t syncForwardToPeer(int64_t rid, const SRpcMsg* pBuf, bool isWeak) { return 0; }
 
 ESyncState syncGetMyRole(int64_t rid) { return TAOS_SYNC_STATE_LEADER; }
@@ -76,6 +78,8 @@ SSyncNode* syncNodeOpen(const SSyncInfo* pSyncInfo) {
 
   pSyncNode->rpcClient = pSyncInfo->rpcClient;
   pSyncNode->FpSendMsg = pSyncInfo->FpSendMsg;
+  pSyncNode->queue = pSyncInfo->queue;
+  pSyncNode->FpEqMsg = pSyncInfo->FpEqMsg;
 
   pSyncNode->me = pSyncInfo->syncCfg.nodeInfo[pSyncInfo->syncCfg.myIndex];
   pSyncNode->peersNum = pSyncInfo->syncCfg.replicaNum - 1;
@@ -93,8 +97,8 @@ SSyncNode* syncNodeOpen(const SSyncInfo* pSyncInfo) {
 
   pSyncNode->pPingTimer = NULL;
   pSyncNode->pingTimerMS = 1000;
-  atomic_store_8(&pSyncNode->pingTimerStart, 0);
-  pSyncNode->FpPingTimer = syncNodePingTimerCb;
+  atomic_store_8(&pSyncNode->pingTimerEnable, 0);
+  pSyncNode->FpPingTimer = syncNodeEqPingTimer;
   pSyncNode->pingTimerCounter = 0;
 
   pSyncNode->FpOnPing = syncNodeOnPingCb;
@@ -103,6 +107,7 @@ SSyncNode* syncNodeOpen(const SSyncInfo* pSyncInfo) {
   pSyncNode->FpOnRequestVoteReply = syncNodeOnRequestVoteReplyCb;
   pSyncNode->FpOnAppendEntries = syncNodeOnAppendEntriesCb;
   pSyncNode->FpOnAppendEntriesReply = syncNodeOnAppendEntriesReplyCb;
+  pSyncNode->FpOnTimeout = syncNodeOnTimeoutCb;
 
   return pSyncNode;
 }
@@ -148,22 +153,76 @@ void syncNodePingSelf(SSyncNode* pSyncNode) {
 int32_t syncNodeStartPingTimer(SSyncNode* pSyncNode) {
   if (pSyncNode->pPingTimer == NULL) {
     pSyncNode->pPingTimer =
-        taosTmrStart(pSyncNode->FpPingTimer, pSyncNode->pingTimerCounter, pSyncNode, gSyncEnv->pTimerManager);
+        taosTmrStart(pSyncNode->FpPingTimer, pSyncNode->pingTimerMS, pSyncNode, gSyncEnv->pTimerManager);
   } else {
-    taosTmrReset(pSyncNode->FpPingTimer, pSyncNode->pingTimerCounter, pSyncNode, gSyncEnv->pTimerManager,
+    taosTmrReset(pSyncNode->FpPingTimer, pSyncNode->pingTimerMS, pSyncNode, gSyncEnv->pTimerManager,
                  &pSyncNode->pPingTimer);
   }
 
-  atomic_store_8(&pSyncNode->pingTimerStart, 1);
+  atomic_store_8(&pSyncNode->pingTimerEnable, 1);
   return 0;
 }
 
 int32_t syncNodeStopPingTimer(SSyncNode* pSyncNode) {
-  atomic_store_8(&pSyncNode->pingTimerStart, 0);
-  pSyncNode->pingTimerCounter = TIMER_MAX_MS;
+  atomic_store_8(&pSyncNode->pingTimerEnable, 0);
+  pSyncNode->pingTimerMS = TIMER_MAX_MS;
+  return 0;
+}
+
+int32_t syncNodeStartElectTimer(SSyncNode* pSyncNode) {
+  if (pSyncNode->pElectTimer == NULL) {
+    pSyncNode->pElectTimer =
+        taosTmrStart(pSyncNode->FpElectTimer, pSyncNode->electTimerMS, pSyncNode, gSyncEnv->pTimerManager);
+  } else {
+    taosTmrReset(pSyncNode->FpElectTimer, pSyncNode->electTimerMS, pSyncNode, gSyncEnv->pTimerManager,
+                 &pSyncNode->pElectTimer);
+  }
+
+  atomic_store_8(&pSyncNode->electTimerEnable, 1);
+  return 0;
+}
+
+int32_t syncNodeStopElectTimer(SSyncNode* pSyncNode) {
+  atomic_store_8(&pSyncNode->electTimerEnable, 0);
+  pSyncNode->electTimerMS = TIMER_MAX_MS;
+  return 0;
+}
+
+int32_t syncNodeResetElectTimer(SSyncNode* pSyncNode, int32_t ms) { return 0; }
+
+int32_t syncNodeStartHeartbeatTimer(SSyncNode* pSyncNode) {
+  if (pSyncNode->pHeartbeatTimer == NULL) {
+    pSyncNode->pHeartbeatTimer =
+        taosTmrStart(pSyncNode->FpHeartbeatTimer, pSyncNode->heartbeatTimerMS, pSyncNode, gSyncEnv->pTimerManager);
+  } else {
+    taosTmrReset(pSyncNode->FpHeartbeatTimer, pSyncNode->heartbeatTimerMS, pSyncNode, gSyncEnv->pTimerManager,
+                 &pSyncNode->pHeartbeatTimer);
+  }
+
+  atomic_store_8(&pSyncNode->heartbeatTimerEnable, 1);
   return 0;
 }
 
+int32_t syncNodeStopHeartbeatTimer(SSyncNode* pSyncNode) {
+  atomic_store_8(&pSyncNode->heartbeatTimerEnable, 0);
+  pSyncNode->heartbeatTimerMS = TIMER_MAX_MS;
+  return 0;
+}
+
+int32_t syncNodeResetHeartbeatTimer(SSyncNode* pSyncNode, int32_t ms) { return 0; }
+
+void syncNodeBecomeFollower(SSyncNode* pSyncNode) {}
+
+void syncNodeBecomeLeader(SSyncNode* pSyncNode) {}
+
+void syncNodeFollower2Candidate(SSyncNode* pSyncNode) {}
+
+void syncNodeCandidate2Leader(SSyncNode* pSyncNode) {}
+
+void syncNodeLeader2Follower(SSyncNode* pSyncNode) {}
+
+void syncNodeCandidate2Follower(SSyncNode* pSyncNode) {}
+
 // ------ local funciton ---------
 static int32_t syncNodePing(SSyncNode* pSyncNode, const SRaftId* destRaftId, SyncPing* pMsg) {
   sTrace("syncNodePing pSyncNode:%p ", pSyncNode);
@@ -204,7 +263,6 @@ static int32_t syncNodeAppendEntries(SSyncNode* ths, const SyncAppendEntries* pM
 }
 
 static int32_t syncNodeSendMsgById(const SRaftId* destRaftId, SSyncNode* pSyncNode, SRpcMsg* pMsg) {
-  sTrace("syncNodeSendMsgById pSyncNode:%p ", pSyncNode);
   SEpSet epSet;
   syncUtilraftId2EpSet(destRaftId, &epSet);
   pSyncNode->FpSendMsg(pSyncNode->rpcClient, &epSet, pMsg);
@@ -225,7 +283,7 @@ static int32_t syncNodeOnPingCb(SSyncNode* ths, SyncPing* pMsg) {
   {
     cJSON* pJson = syncPing2Json(pMsg);
     char*  serialized = cJSON_Print(pJson);
-    sTrace("syncNodeOnPingCb syncNodePing pMsg:%s ", serialized);
+    sTrace("process syncMessage recv: syncNodeOnPingCb pMsg:%s ", serialized);
     free(serialized);
     cJSON_Delete(pJson);
   }
@@ -245,7 +303,7 @@ static int32_t syncNodeOnPingReplyCb(SSyncNode* ths, SyncPingReply* pMsg) {
   {
     cJSON* pJson = syncPingReply2Json(pMsg);
     char*  serialized = cJSON_Print(pJson);
-    sTrace("syncNodeOnPingReplyCb syncNodePing pMsg:%s ", serialized);
+    sTrace("process syncMessage recv: syncNodeOnPingReplyCb pMsg:%s ", serialized);
     free(serialized);
     cJSON_Delete(pJson);
   }
@@ -273,22 +331,50 @@ static int32_t syncNodeOnAppendEntriesReplyCb(SSyncNode* ths, SyncAppendEntriesR
   return ret;
 }
 
-static void syncNodePingTimerCb(void* param, void* tmrId) {
+static int32_t syncNodeOnTimeoutCb(SSyncNode* ths, SyncTimeout* pMsg) {
+  int32_t ret = 0;
+  sTrace("<-- syncNodeOnTimeoutCb -->");
+
+  {
+    cJSON* pJson = syncTimeout2Json(pMsg);
+    char*  serialized = cJSON_Print(pJson);
+    sTrace("process syncMessage recv: syncNodeOnTimeoutCb pMsg:%s ", serialized);
+    free(serialized);
+    cJSON_Delete(pJson);
+  }
+
+  if (pMsg->timeoutType == SYNC_TIMEOUT_PING) {
+    if (atomic_load_8(&ths->pingTimerEnable)) {
+      ++(ths->pingTimerCounter);
+      syncNodePingAll(ths);
+    }
+
+  } else if (pMsg->timeoutType == SYNC_TIMEOUT_ELECTION) {
+  } else if (pMsg->timeoutType == SYNC_TIMEOUT_HEARTBEAT) {
+  } else {
+  }
+
+  return ret;
+}
+
+static void syncNodeEqPingTimer(void* param, void* tmrId) {
   SSyncNode* pSyncNode = (SSyncNode*)param;
-  if (atomic_load_8(&pSyncNode->pingTimerStart)) {
-    ++(pSyncNode->pingTimerCounter);
+  if (atomic_load_8(&pSyncNode->pingTimerEnable)) {
     // pSyncNode->pingTimerMS += 100;
 
-    sTrace(
-        "syncNodePingTimerCb: pSyncNode->pingTimerCounter:%lu, pSyncNode->pingTimerMS:%d, pSyncNode->pPingTimer:%p, "
-        "tmrId:%p ",
-        pSyncNode->pingTimerCounter, pSyncNode->pingTimerMS, pSyncNode->pPingTimer, tmrId);
-
-    syncNodePingAll(pSyncNode);
+    SyncTimeout* pSyncMsg = syncTimeoutBuild2(SYNC_TIMEOUT_PING, pSyncNode);
+    SRpcMsg      rpcMsg;
+    syncTimeout2RpcMsg(pSyncMsg, &rpcMsg);
+    pSyncNode->FpEqMsg(pSyncNode->queue, &rpcMsg);
+    syncTimeoutDestroy(pSyncMsg);
 
-    taosTmrReset(syncNodePingTimerCb, pSyncNode->pingTimerMS, pSyncNode, &gSyncEnv->pTimerManager,
+    taosTmrReset(syncNodeEqPingTimer, pSyncNode->pingTimerMS, pSyncNode, &gSyncEnv->pTimerManager,
                  &pSyncNode->pPingTimer);
   } else {
-    sTrace("syncNodePingTimerCb: pingTimerStart:%u ", pSyncNode->pingTimerStart);
+    sTrace("syncNodeEqPingTimer: pingTimerEnable:%u ", pSyncNode->pingTimerEnable);
   }
-}
\ No newline at end of file
+}
+
+static void syncNodeEqElectTimer(void* param, void* tmrId) {}
+
+static void syncNodeEqHeartbeatTimer(void* param, void* tmrId) {}
\ No newline at end of file
diff --git a/source/libs/sync/src/syncMessage.c b/source/libs/sync/src/syncMessage.c
index 4c44b4691c5b439b5f7308be3c4103364d15c46a..f1434947a1132161477ac9991d5ea965ed380372 100644
--- a/source/libs/sync/src/syncMessage.c
+++ b/source/libs/sync/src/syncMessage.c
@@ -20,6 +20,124 @@
 
 void onMessage(SRaft* pRaft, void* pMsg) {}
 
+// ---------------------------------------------
+cJSON* syncRpcMsg2Json(SRpcMsg* pRpcMsg) {
+  cJSON* pRoot;
+
+  // in compiler optimization, switch case = if else constants
+  if (pRpcMsg->msgType == SYNC_TIMEOUT) {
+    SyncTimeout* pSyncMsg = (SyncTimeout*)pRpcMsg->pCont;
+    pRoot = syncTimeout2Json(pSyncMsg);
+
+  } else if (pRpcMsg->msgType == SYNC_PING) {
+    SyncPing* pSyncMsg = (SyncPing*)pRpcMsg->pCont;
+    pRoot = syncPing2Json(pSyncMsg);
+
+  } else if (pRpcMsg->msgType == SYNC_PING_REPLY) {
+    SyncPingReply* pSyncMsg = (SyncPingReply*)pRpcMsg->pCont;
+    pRoot = syncPingReply2Json(pSyncMsg);
+
+  } else if (pRpcMsg->msgType == SYNC_CLIENT_REQUEST) {
+    pRoot = syncRpcUnknownMsg2Json();
+
+  } else if (pRpcMsg->msgType == SYNC_CLIENT_REQUEST_REPLY) {
+    pRoot = syncRpcUnknownMsg2Json();
+
+  } else if (pRpcMsg->msgType == SYNC_REQUEST_VOTE) {
+    SyncRequestVote* pSyncMsg = (SyncRequestVote*)pRpcMsg->pCont;
+    pRoot = syncRequestVote2Json(pSyncMsg);
+
+  } else if (pRpcMsg->msgType == SYNC_REQUEST_VOTE_REPLY) {
+    SyncRequestVoteReply* pSyncMsg = (SyncRequestVoteReply*)pRpcMsg->pCont;
+    pRoot = syncRequestVoteReply2Json(pSyncMsg);
+
+  } else if (pRpcMsg->msgType == SYNC_APPEND_ENTRIES) {
+    SyncAppendEntries* pSyncMsg = (SyncAppendEntries*)pRpcMsg->pCont;
+    pRoot = syncAppendEntries2Json(pSyncMsg);
+
+  } else if (pRpcMsg->msgType == SYNC_APPEND_ENTRIES_REPLY) {
+    SyncAppendEntriesReply* pSyncMsg = (SyncAppendEntriesReply*)pRpcMsg->pCont;
+    pRoot = syncAppendEntriesReply2Json(pSyncMsg);
+
+  } else {
+    pRoot = syncRpcUnknownMsg2Json();
+  }
+
+  cJSON* pJson = cJSON_CreateObject();
+  cJSON_AddItemToObject(pJson, "RpcMsg", pRoot);
+  return pJson;
+}
+
+cJSON* syncRpcUnknownMsg2Json() {
+  cJSON* pRoot = cJSON_CreateObject();
+  cJSON_AddNumberToObject(pRoot, "msgType", SYNC_UNKNOWN);
+  cJSON_AddStringToObject(pRoot, "data", "known message");
+
+  cJSON* pJson = cJSON_CreateObject();
+  cJSON_AddItemToObject(pJson, "SyncPing", pRoot);
+  return pJson;
+}
+
+// ---- message process SyncTimeout----
+SyncTimeout* syncTimeoutBuild() {
+  uint32_t     bytes = sizeof(SyncTimeout);
+  SyncTimeout* pMsg = malloc(bytes);
+  memset(pMsg, 0, bytes);
+  pMsg->bytes = bytes;
+  pMsg->msgType = SYNC_TIMEOUT;
+  return pMsg;
+}
+
+void syncTimeoutDestroy(SyncTimeout* pMsg) {
+  if (pMsg != NULL) {
+    free(pMsg);
+  }
+}
+
+void syncTimeoutSerialize(const SyncTimeout* pMsg, char* buf, uint32_t bufLen) {
+  assert(pMsg->bytes <= bufLen);
+  memcpy(buf, pMsg, pMsg->bytes);
+}
+
+void syncTimeoutDeserialize(const char* buf, uint32_t len, SyncTimeout* pMsg) {
+  memcpy(pMsg, buf, len);
+  assert(len == pMsg->bytes);
+}
+
+void syncTimeout2RpcMsg(const SyncTimeout* pMsg, SRpcMsg* pRpcMsg) {
+  memset(pRpcMsg, 0, sizeof(*pRpcMsg));
+  pRpcMsg->msgType = pMsg->msgType;
+  pRpcMsg->contLen = pMsg->bytes;
+  pRpcMsg->pCont = rpcMallocCont(pRpcMsg->contLen);
+  syncTimeoutSerialize(pMsg, pRpcMsg->pCont, pRpcMsg->contLen);
+}
+
+void syncTimeoutFromRpcMsg(const SRpcMsg* pRpcMsg, SyncTimeout* pMsg) {
+  syncTimeoutDeserialize(pRpcMsg->pCont, pRpcMsg->contLen, pMsg);
+}
+
+cJSON* syncTimeout2Json(const SyncTimeout* pMsg) {
+  char u64buf[128];
+
+  cJSON* pRoot = cJSON_CreateObject();
+  cJSON_AddNumberToObject(pRoot, "bytes", pMsg->bytes);
+  cJSON_AddNumberToObject(pRoot, "msgType", pMsg->msgType);
+  cJSON_AddNumberToObject(pRoot, "timeoutType", pMsg->timeoutType);
+  snprintf(u64buf, sizeof(u64buf), "%p", pMsg->data);
+  cJSON_AddStringToObject(pRoot, "data", u64buf);
+
+  cJSON* pJson = cJSON_CreateObject();
+  cJSON_AddItemToObject(pJson, "SyncTimeout", pRoot);
+  return pJson;
+}
+
+SyncTimeout* syncTimeoutBuild2(ESyncTimeoutType timeoutType, void* data) {
+  SyncTimeout* pMsg = syncTimeoutBuild();
+  pMsg->timeoutType = timeoutType;
+  pMsg->data = data;
+  return pMsg;
+}
+
 // ---- message process SyncPing----
 SyncPing* syncPingBuild(uint32_t dataLen) {
   uint32_t  bytes = SYNC_PING_FIX_LEN + dataLen;
diff --git a/source/libs/sync/src/syncReplication.c b/source/libs/sync/src/syncReplication.c
index 4cea7c150e19b490910adf771cfca050c03aea22..e3e551fd2b2d3c5f2338e7e84345f8a618fec738 100644
--- a/source/libs/sync/src/syncReplication.c
+++ b/source/libs/sync/src/syncReplication.c
@@ -14,3 +14,5 @@
  */
 
 #include "syncReplication.h"
+
+void syncNodeAppendEntriesPeers(SSyncNode* pSyncNode) {}
\ No newline at end of file
diff --git a/source/libs/sync/src/syncUtil.c b/source/libs/sync/src/syncUtil.c
index b4959a810b5b730bfebebd48ae34bda88c112fe0..7b4d6ee366d8a327c7706899cd2525c5fbd93feb 100644
--- a/source/libs/sync/src/syncUtil.c
+++ b/source/libs/sync/src/syncUtil.c
@@ -68,8 +68,12 @@ void syncUtilnodeInfo2raftId(const SNodeInfo* pNodeInfo, SyncGroupId vgId, SRaft
   raftId->vgId = vgId;
 }
 
+bool syncUtilSameId(const SRaftId* pId1, const SRaftId* pId2) {
+  bool ret = pId1->addr == pId2->addr && pId1->vgId == pId2->vgId;
+  return ret;
+}
+
 // ---- SSyncBuffer -----
-#if 0
 void syncUtilbufBuild(SSyncBuffer* syncBuf, size_t len) {
   syncBuf->len = len;
   syncBuf->data = malloc(syncBuf->len);
@@ -87,4 +91,3 @@ void syncUtilbufCopyDeep(const SSyncBuffer* src, SSyncBuffer* dest) {
   dest->data = malloc(dest->len);
   memcpy(dest->data, src->data, dest->len);
 }
-#endif
\ No newline at end of file
diff --git a/source/libs/sync/src/syncVoteMgr.c b/source/libs/sync/src/syncVoteMgr.c
index 02cf4ac03365eb8cedb49eff0b1ba1de08f4699f..c9f0ceab57a62116f4a786bdba3c386a28dfbd3b 100644
--- a/source/libs/sync/src/syncVoteMgr.c
+++ b/source/libs/sync/src/syncVoteMgr.c
@@ -14,3 +14,83 @@
  */
 
 #include "syncVoteMgr.h"
+
+SVotesGranted *voteGrantedCreate(SSyncNode *pSyncNode) {
+  SVotesGranted *pVotesGranted = malloc(sizeof(SVotesGranted));
+  assert(pVotesGranted != NULL);
+  memset(pVotesGranted, 0, sizeof(SVotesGranted));
+
+  pVotesGranted->quorum = pSyncNode->quorum;
+  pVotesGranted->term = 0;
+  pVotesGranted->votes = 0;
+  pVotesGranted->toLeader = false;
+  pVotesGranted->pSyncNode = pSyncNode;
+
+  return pVotesGranted;
+}
+
+void voteGrantedDestroy(SVotesGranted *pVotesGranted) {
+  if (pVotesGranted != NULL) {
+    free(pVotesGranted);
+  }
+}
+
+bool voteGrantedMajority(SVotesGranted *pVotesGranted) {
+  bool ret = pVotesGranted->votes >= pVotesGranted->quorum;
+  return ret;
+}
+
+void voteGrantedVote(SVotesGranted *pVotesGranted, SyncRequestVoteReply *pMsg) {
+  assert(pMsg->voteGranted == true);
+  assert(pMsg->term == pVotesGranted->term);
+  pVotesGranted->votes++;
+}
+
+void voteGrantedReset(SVotesGranted *pVotesGranted, SyncTerm term) {
+  pVotesGranted->term = term;
+  pVotesGranted->votes = 0;
+  pVotesGranted->toLeader = false;
+}
+
+SVotesRespond *votesRespondCreate(SSyncNode *pSyncNode) {
+  SVotesRespond *pVotesRespond = malloc(sizeof(SVotesRespond));
+  assert(pVotesRespond != NULL);
+  memset(pVotesRespond, 0, sizeof(SVotesRespond));
+
+  pVotesRespond->replicas = &(pSyncNode->replicasId);
+  pVotesRespond->replicaNum = pSyncNode->replicaNum;
+  pVotesRespond->term = 0;
+  pVotesRespond->pSyncNode = pSyncNode;
+
+  return pVotesRespond;
+}
+
+bool votesResponded(SVotesRespond *pVotesRespond, const SRaftId *pRaftId) {
+  bool ret = false;
+  for (int i = 0; i < pVotesRespond->replicaNum; ++i) {
+    if (syncUtilSameId(&(*pVotesRespond->replicas)[i], pRaftId) && pVotesRespond->isRespond[i]) {
+      ret = true;
+      break;
+    }
+  }
+  return ret;
+}
+
+void votesRespondAdd(SVotesRespond *pVotesRespond, const SyncRequestVoteReply *pMsg) {
+  assert(pVotesRespond->term == pMsg->term);
+  for (int i = 0; i < pVotesRespond->replicaNum; ++i) {
+    if (syncUtilSameId(&(*pVotesRespond->replicas)[i], &pMsg->srcId)) {
+      assert(pVotesRespond->isRespond[i] == false);
+      pVotesRespond->isRespond[i] = true;
+      return;
+    }
+  }
+  assert(0);
+}
+
+void Reset(SVotesRespond *pVotesRespond, SyncTerm term) {
+  pVotesRespond->term = term;
+  for (int i = 0; i < pVotesRespond->replicaNum; ++i) {
+    pVotesRespond->isRespond[i] = false;
+  }
+}
\ No newline at end of file
diff --git a/source/libs/sync/test/CMakeLists.txt b/source/libs/sync/test/CMakeLists.txt
index 2913d230b2023d089b2a9166c44866870b93428c..4c5f7ffa56a42a42e807eec800ae723918076992 100644
--- a/source/libs/sync/test/CMakeLists.txt
+++ b/source/libs/sync/test/CMakeLists.txt
@@ -8,6 +8,7 @@ add_executable(syncIOSendMsgTest "")
 add_executable(syncIOSendMsgClientTest "")
 add_executable(syncIOSendMsgServerTest "")
 add_executable(syncRaftStoreTest "")
+add_executable(syncEnqTest "")
 
 
 target_sources(syncTest
@@ -50,6 +51,10 @@ target_sources(syncRaftStoreTest
     PRIVATE
     "syncRaftStoreTest.cpp"
 )
+target_sources(syncEnqTest
+    PRIVATE
+    "syncEnqTest.cpp"
+)
 
 
 target_include_directories(syncTest
@@ -102,6 +107,11 @@ target_include_directories(syncRaftStoreTest
     "${CMAKE_SOURCE_DIR}/include/libs/sync"
     "${CMAKE_CURRENT_SOURCE_DIR}/../inc"
 )
+target_include_directories(syncEnqTest
+    PUBLIC
+    "${CMAKE_SOURCE_DIR}/include/libs/sync"
+    "${CMAKE_CURRENT_SOURCE_DIR}/../inc"
+)
 
 
 target_link_libraries(syncTest
@@ -144,6 +154,10 @@ target_link_libraries(syncRaftStoreTest
     sync
     gtest_main
 )
+target_link_libraries(syncEnqTest
+    sync
+    gtest_main
+)
 
 
 enable_testing()
diff --git a/source/libs/sync/test/syncEnqTest.cpp b/source/libs/sync/test/syncEnqTest.cpp
new file mode 100644
index 0000000000000000000000000000000000000000..0bf43f933ee85610b6280c88f6120c2e8677e221
--- /dev/null
+++ b/source/libs/sync/test/syncEnqTest.cpp
@@ -0,0 +1,99 @@
+#include <stdio.h>
+#include "syncEnv.h"
+#include "syncIO.h"
+#include "syncInt.h"
+#include "syncRaftStore.h"
+
+void logTest() {
+  sTrace("--- sync log test: trace");
+  sDebug("--- sync log test: debug");
+  sInfo("--- sync log test: info");
+  sWarn("--- sync log test: warn");
+  sError("--- sync log test: error");
+  sFatal("--- sync log test: fatal");
+}
+
+uint16_t ports[3] = {7010, 7110, 7210};
+
+SSyncNode* doSync(int myIndex) {
+  SSyncFSM* pFsm;
+
+  SSyncInfo syncInfo;
+  syncInfo.vgId = 1;
+  syncInfo.rpcClient = gSyncIO->clientRpc;
+  syncInfo.FpSendMsg = syncIOSendMsg;
+  syncInfo.queue = gSyncIO->pMsgQ;
+  syncInfo.FpEqMsg = syncIOEqMsg;
+  syncInfo.pFsm = pFsm;
+  snprintf(syncInfo.path, sizeof(syncInfo.path), "%s", "./test_sync_ping");
+
+  SSyncCfg* pCfg = &syncInfo.syncCfg;
+  pCfg->myIndex = myIndex;
+  pCfg->replicaNum = 3;
+
+  pCfg->nodeInfo[0].nodePort = ports[0];
+  snprintf(pCfg->nodeInfo[0].nodeFqdn, sizeof(pCfg->nodeInfo[0].nodeFqdn), "%s", "127.0.0.1");
+  // taosGetFqdn(pCfg->nodeInfo[0].nodeFqdn);
+
+  pCfg->nodeInfo[1].nodePort = ports[1];
+  snprintf(pCfg->nodeInfo[1].nodeFqdn, sizeof(pCfg->nodeInfo[1].nodeFqdn), "%s", "127.0.0.1");
+  // taosGetFqdn(pCfg->nodeInfo[1].nodeFqdn);
+
+  pCfg->nodeInfo[2].nodePort = ports[2];
+  snprintf(pCfg->nodeInfo[2].nodeFqdn, sizeof(pCfg->nodeInfo[2].nodeFqdn), "%s", "127.0.0.1");
+  // taosGetFqdn(pCfg->nodeInfo[2].nodeFqdn);
+
+  SSyncNode* pSyncNode = syncNodeOpen(&syncInfo);
+  assert(pSyncNode != NULL);
+
+  gSyncIO->FpOnSyncPing = pSyncNode->FpOnPing;
+  gSyncIO->pSyncNode = pSyncNode;
+
+  return pSyncNode;
+}
+
+void timerPingAll(void* param, void* tmrId) {
+  SSyncNode* pSyncNode = (SSyncNode*)param;
+  syncNodePingAll(pSyncNode);
+}
+
+int main(int argc, char** argv) {
+  // taosInitLog((char*)"syncPingTest.log", 100000, 10);
+  tsAsyncLog = 0;
+  sDebugFlag = 143 + 64;
+
+  logTest();
+
+  int myIndex = 0;
+  if (argc >= 2) {
+    myIndex = atoi(argv[1]);
+    if (myIndex > 2 || myIndex < 0) {
+      fprintf(stderr, "myIndex:%d error. should be 0 - 2", myIndex);
+      return 1;
+    }
+  }
+
+  int32_t ret = syncIOStart((char*)"127.0.0.1", ports[myIndex]);
+  assert(ret == 0);
+
+  ret = syncEnvStart();
+  assert(ret == 0);
+
+  SSyncNode* pSyncNode = doSync(myIndex);
+  gSyncIO->FpOnSyncPing = pSyncNode->FpOnPing;
+  gSyncIO->FpOnSyncPingReply = pSyncNode->FpOnPingReply;
+
+  for (int i = 0; i < 10; ++i) {
+    SyncPingReply* pSyncMsg = syncPingReplyBuild3(&pSyncNode->raftId, &pSyncNode->raftId);
+    SRpcMsg        rpcMsg;
+    syncPingReply2RpcMsg(pSyncMsg, &rpcMsg);
+    pSyncNode->FpEqMsg(pSyncNode->queue, &rpcMsg);
+    taosMsleep(1000);
+  }
+
+  while (1) {
+    taosMsleep(1000);
+  }
+
+  return 0;
+}
diff --git a/source/libs/sync/test/syncPingTest.cpp b/source/libs/sync/test/syncPingTest.cpp
index 82681283477f23623aa37113487d41a9dbaad4be..77413a713b13547e33c6177195c72ea687687d71 100644
--- a/source/libs/sync/test/syncPingTest.cpp
+++ b/source/libs/sync/test/syncPingTest.cpp
@@ -22,6 +22,8 @@ SSyncNode* doSync(int myIndex) {
   syncInfo.vgId = 1;
   syncInfo.rpcClient = gSyncIO->clientRpc;
   syncInfo.FpSendMsg = syncIOSendMsg;
+  syncInfo.queue = gSyncIO->pMsgQ;
+  syncInfo.FpEqMsg = syncIOEqMsg;
   syncInfo.pFsm = pFsm;
   snprintf(syncInfo.path, sizeof(syncInfo.path), "%s", "./test_sync_ping");
 
@@ -76,15 +78,14 @@ int main(int argc, char** argv) {
   SSyncNode* pSyncNode = doSync(myIndex);
   gSyncIO->FpOnSyncPing = pSyncNode->FpOnPing;
   gSyncIO->FpOnSyncPingReply = pSyncNode->FpOnPingReply;
+  gSyncIO->FpOnSyncTimeout = pSyncNode->FpOnTimeout;
 
   ret = syncNodeStartPingTimer(pSyncNode);
   assert(ret == 0);
 
-  /*
-    taosMsleep(10000);
-    ret = syncNodeStopPingTimer(pSyncNode);
-    assert(ret == 0);
-  */
+  taosMsleep(10000);
+  ret = syncNodeStopPingTimer(pSyncNode);
+  assert(ret == 0);
 
   while (1) {
     taosMsleep(1000);
diff --git a/source/os/src/osSysinfo.c b/source/os/src/osSysinfo.c
index 12952141a4f58f5fd7bb5b6de05d9fd6c51f295e..8f2820f67a84a531bc34fc9d4863a1982028cafe 100644
--- a/source/os/src/osSysinfo.c
+++ b/source/os/src/osSysinfo.c
@@ -87,7 +87,7 @@ int32_t taosGetCpuCores(float *numOfCores) {
   return 0;
 }
 
-int32_t taosGetCpuUsage(float *sysCpuUsage, float *procCpuUsage) {
+int32_t taosGetCpuUsage(double *sysCpuUsage, double *procCpuUsage) {
   *sysCpuUsage = 0;
   *procCpuUsage = 0;
   return 0;
@@ -112,64 +112,32 @@ int32_t taosGetDiskSize(char *dataDir, SDiskSize *diskSize) {
   }
 }
 
-int32_t taosGetCardInfo(int64_t *bytes, int64_t *rbytes, int64_t *tbytes) {
-  if (bytes) *bytes = 0;
-  if (rbytes) *rbytes = 0;
-  if (tbytes) *tbytes = 0;
+int32_t taosGetCardInfo(int64_t *receive_bytes, int64_t *transmit_bytes) {
+  *receive_bytes = 0;
+  *transmit_bytes = 0;
   return 0;
 }
 
-int32_t taosGetBandSpeed(float *bandSpeedKb) {
-  *bandSpeedKb = 0;
-  return 0;
-}
-
-int32_t taosReadProcIO(int64_t *readbyte, int64_t *writebyte) {
+int32_t taosReadProcIO(int64_t *rchars, int64_t *wchars, int64_t *read_bytes, int64_t *write_bytes) {
   IO_COUNTERS io_counter;
   if (GetProcessIoCounters(GetCurrentProcess(), &io_counter)) {
-    if (readbyte) *readbyte = io_counter.ReadTransferCount;
-    if (writebyte) *writebyte = io_counter.WriteTransferCount;
+    if (rchars) *rchars = io_counter.ReadTransferCount;
+    if (wchars) *wchars = io_counter.WriteTransferCount;
+    if (read_bytes) *read_bytes = 0;
+    if (write_bytes) *write_bytes = 0;
     return 0;
   }
   return -1;
 }
 
-int32_t taosGetProcIO(float *readKB, float *writeKB) {
-  static int64_t lastReadbyte = -1;
-  static int64_t lastWritebyte = -1;
-
-  int64_t curReadbyte = 0;
-  int64_t curWritebyte = 0;
-
-  if (taosReadProcIO(&curReadbyte, &curWritebyte) != 0) {
-    return -1;
-  }
-
-  if (lastReadbyte == -1 || lastWritebyte == -1) {
-    lastReadbyte = curReadbyte;
-    lastWritebyte = curWritebyte;
-    return -1;
-  }
-
-  *readKB = (float)((double)(curReadbyte - lastReadbyte) / 1024);
-  *writeKB = (float)((double)(curWritebyte - lastWritebyte) / 1024);
-  if (*readKB < 0) *readKB = 0;
-  if (*writeKB < 0) *writeKB = 0;
-
-  lastReadbyte = curReadbyte;
-  lastWritebyte = curWritebyte;
-
-  return 0;
-}
-
 void taosGetSystemInfo() {
   taosGetCpuCores(&tsNumOfCores);
   taosGetTotalMemory(&tsTotalMemoryKB);
 
-  float tmp1, tmp2;
-  taosGetBandSpeed(&tmp1);
+  double tmp1, tmp2, tmp3, tmp4;
+  taosGetBandSpeed(&tmp1, &tmp2);
   taosGetCpuUsage(&tmp1, &tmp2);
-  taosGetProcIO(&tmp1, &tmp2);
+  taosGetIOSpeed(&tmp1, &tmp2, &tmp3, &tmp4);
 }
 
 void taosKillSystem() {
@@ -259,31 +227,21 @@ void taosGetSystemInfo() {
   tsNumOfCores = sysconf(_SC_NPROCESSORS_ONLN);
 }
 
-int32_t taosReadProcIO(int64_t *rchars, int64_t *wchars) {
+int32_t taosReadProcIO(int64_t *rchars, int64_t *wchars, int64_t *read_bytes, int64_t *write_bytes) {
   if (rchars) *rchars = 0;
   if (wchars) *wchars = 0;
+  if (read_bytes) *read_bytes = 0;
+  if (write_bytes) *write_bytes = 0;
   return 0;
 }
 
-int32_t taosGetProcIO(float *readKB, float *writeKB) {
-  *readKB = 0;
-  *writeKB = 0;
+int32_t taosGetCardInfo(int64_t *receive_bytes, int64_t *transmit_bytes) {
+  *receive_bytes = 0;
+  *transmit_bytes = 0;
   return 0;
 }
 
-int32_t taosGetCardInfo(int64_t *bytes, int64_t *rbytes, int64_t *tbytes) {
-  if (bytes) *bytes = 0;
-  if (rbytes) *rbytes = 0;
-  if (tbytes) *tbytes = 0;
-  return 0;
-}
-
-int32_t taosGetBandSpeed(float *bandSpeedKb) {
-  *bandSpeedKb = 0;
-  return 0;
-}
-
-int32_t taosGetCpuUsage(float *sysCpuUsage, float *procCpuUsage) {
+int32_t taosGetCpuUsage(double *sysCpuUsage, double *procCpuUsage) {
   *sysCpuUsage = 0;
   *procCpuUsage = 0;
   return 0;
@@ -400,7 +358,6 @@ int32_t taosGetSysMemory(int64_t *usedKB) {
 }
 
 int32_t taosGetProcMemory(int64_t *usedKB) {
-  // FILE *fp = fopen(tsProcMemFile, "r");
   TdFilePtr pFile = taosOpenFile(tsProcMemFile, TD_FILE_READ | TD_FILE_STREAM);
   if (pFile == NULL) {
     // printf("open file:%s failed", tsProcMemFile);
@@ -434,7 +391,6 @@ int32_t taosGetProcMemory(int64_t *usedKB) {
 }
 
 static int32_t taosGetSysCpuInfo(SysCpuInfo *cpuInfo) {
-  // FILE *fp = fopen(tsSysCpuFile, "r");
   TdFilePtr pFile = taosOpenFile(tsSysCpuFile, TD_FILE_READ | TD_FILE_STREAM);
   if (pFile == NULL) {
     // printf("open file:%s failed", tsSysCpuFile);
@@ -459,7 +415,6 @@ static int32_t taosGetSysCpuInfo(SysCpuInfo *cpuInfo) {
 }
 
 static int32_t taosGetProcCpuInfo(ProcCpuInfo *cpuInfo) {
-  // FILE *fp = fopen(tsProcCpuFile, "r");
   TdFilePtr pFile = taosOpenFile(tsProcCpuFile, TD_FILE_READ | TD_FILE_STREAM);
   if (pFile == NULL) {
     // printf("open file:%s failed", tsProcCpuFile);
@@ -493,7 +448,7 @@ int32_t taosGetCpuCores(float *numOfCores) {
   return 0;
 }
 
-int32_t taosGetCpuUsage(float *cpu_system, float *cpu_engine) {
+int32_t taosGetCpuUsage(double *cpu_system, double *cpu_engine) {
   static uint64_t lastSysUsed = 0;
   static uint64_t lastSysTotal = 0;
   static uint64_t lastProcTotal = 0;
@@ -522,8 +477,8 @@ int32_t taosGetCpuUsage(float *cpu_system, float *cpu_engine) {
     return -1;
   }
 
-  *cpu_engine = (float)((double)(curSysUsed - lastSysUsed) / (double)(curSysTotal - lastSysTotal) * 100);
-  *cpu_system = (float)((double)(curProcTotal - lastProcTotal) / (double)(curSysTotal - lastSysTotal) * 100);
+  *cpu_engine = (curSysUsed - lastSysUsed) / (double)(curSysTotal - lastSysTotal) * 100;
+  *cpu_system = (curProcTotal - lastProcTotal) / (double)(curSysTotal - lastSysTotal) * 100;
 
   lastSysUsed = curSysUsed;
   lastSysTotal = curSysTotal;
@@ -544,14 +499,9 @@ int32_t taosGetDiskSize(char *dataDir, SDiskSize *diskSize) {
   }
 }
 
-int32_t taosGetCardInfo(int64_t *bytes, int64_t *rbytes, int64_t *tbytes) {
-  if (bytes) *bytes = 0;
-  // FILE *fp = fopen(tsSysNetFile, "r");
+int32_t taosGetCardInfo(int64_t *receive_bytes, int64_t *transmit_bytes) {
   TdFilePtr pFile = taosOpenFile(tsSysNetFile, TD_FILE_READ | TD_FILE_STREAM);
-  if (pFile == NULL) {
-    // printf("open file:%s failed", tsSysNetFile);
-    return -1;
-  }
+  if (pFile == NULL) return -1;
 
   ssize_t _bytes = 0;
   char   *line = NULL;
@@ -584,9 +534,8 @@ int32_t taosGetCardInfo(int64_t *bytes, int64_t *rbytes, int64_t *tbytes) {
            "%s %" PRId64 " %" PRId64 " %" PRId64 " %" PRId64 " %" PRId64 " %" PRId64 " %" PRId64 " %" PRId64 " %" PRId64
            " %" PRId64,
            nouse0, &o_rbytes, &rpackts, &nouse1, &nouse2, &nouse3, &nouse4, &nouse5, &nouse6, &o_tbytes, &tpackets);
-    if (rbytes) *rbytes = o_rbytes;
-    if (tbytes) *tbytes = o_tbytes;
-    if (bytes)  *bytes += (o_rbytes + o_tbytes);
+    *receive_bytes = o_rbytes;
+    *transmit_bytes = o_tbytes;
   }
 
   if (line != NULL) tfree(line);
@@ -595,58 +544,52 @@ int32_t taosGetCardInfo(int64_t *bytes, int64_t *rbytes, int64_t *tbytes) {
   return 0;
 }
 
-int32_t taosGetBandSpeed(float *bandSpeedKb) {
-  static int64_t lastBytes = 0;
-  static time_t  lastTime = 0;
-  int64_t        curBytes = 0;
-  time_t         curTime = time(NULL);
+int32_t taosGetBandSpeed(double *receive_bytes_per_sec, double *transmit_bytes_per_sec) {
+  static int64_t last_receive_bytes = 0;
+  static int64_t last_transmit_bytes = 0;
+  static int64_t last_time = 0;
+  int64_t        cur_receive_bytes = 0;
+  int64_t        cur_transmit_bytes = 0;
+  int64_t        cur_time = taosGetTimestampMs();
 
-  if (taosGetCardInfo(&curBytes, NULL, NULL) != 0) {
+  if (taosGetCardInfo(&cur_receive_bytes, &cur_transmit_bytes) != 0) {
     return -1;
   }
 
-  if (lastTime == 0 || lastBytes == 0) {
-    lastTime = curTime;
-    lastBytes = curBytes;
-    *bandSpeedKb = 0;
+  if (last_time == 0 || last_time >= cur_time) {
+    last_time = cur_time;
+    last_receive_bytes = cur_receive_bytes;
+    last_transmit_bytes = cur_transmit_bytes;
+    *receive_bytes_per_sec = 0;
+    *transmit_bytes_per_sec = 0;
     return 0;
   }
 
-  if (lastTime >= curTime || lastBytes > curBytes) {
-    lastTime = curTime;
-    lastBytes = curBytes;
-    *bandSpeedKb = 0;
-    return 0;
-  }
+  *receive_bytes_per_sec = (cur_receive_bytes - last_receive_bytes) / (double)(cur_time - last_time) * 1000;
+  *transmit_bytes_per_sec = (cur_transmit_bytes - last_transmit_bytes) / (double)(cur_time - last_time) * 1000;
 
-  double totalBytes = (double)(curBytes - lastBytes) / 1024 * 8;  // Kb
-  *bandSpeedKb = (float)(totalBytes / (double)(curTime - lastTime));
+  last_time = cur_time;
+  last_transmit_bytes = cur_transmit_bytes;
+  last_receive_bytes = cur_receive_bytes;
 
-  // //printf("bandwidth lastBytes:%ld, lastTime:%ld, curBytes:%ld, curTime:%ld,
-  // speed:%f", lastBytes, lastTime, curBytes, curTime, *bandSpeed);
-
-  lastTime = curTime;
-  lastBytes = curBytes;
+  if (*receive_bytes_per_sec < 0) *receive_bytes_per_sec = 0;
+  if (*transmit_bytes_per_sec < 0) *transmit_bytes_per_sec = 0;
 
   return 0;
 }
 
-int32_t taosReadProcIO(int64_t *rchars, int64_t *wchars) {
-  // FILE *fp = fopen(tsProcIOFile, "r");
+int32_t taosReadProcIO(int64_t *rchars, int64_t *wchars, int64_t *read_bytes, int64_t *write_bytes) {
   TdFilePtr pFile = taosOpenFile(tsProcIOFile, TD_FILE_READ | TD_FILE_STREAM);
-  if (pFile == NULL) {
-    // printf("open file:%s failed", tsProcIOFile);
-    return -1;
-  }
+  if (pFile == NULL) return -1;
 
   ssize_t _bytes = 0;
   char   *line = NULL;
-  char    tmp[10];
+  char    tmp[24];
   int     readIndex = 0;
 
   while (!taosEOFFile(pFile)) {
     _bytes = taosGetLineFile(pFile, &line);
-    if ((_bytes < 0) || (line == NULL)) {
+    if (_bytes < 10 || line == NULL) {
       break;
     }
     if (strstr(line, "rchar:") != NULL) {
@@ -655,47 +598,70 @@ int32_t taosReadProcIO(int64_t *rchars, int64_t *wchars) {
     } else if (strstr(line, "wchar:") != NULL) {
       sscanf(line, "%s %" PRId64, tmp, wchars);
       readIndex++;
+    } else if (strstr(line, "read_bytes:") != NULL) {  // read_bytes
+      sscanf(line, "%s %" PRId64, tmp, read_bytes);
+      readIndex++;
+    } else if (strstr(line, "write_bytes:") != NULL) {  // write_bytes
+      sscanf(line, "%s %" PRId64, tmp, write_bytes);
+      readIndex++;
     } else {
     }
 
-    if (readIndex >= 2) break;
+    if (readIndex >= 4) break;
   }
 
   if (line != NULL) tfree(line);
   taosCloseFile(&pFile);
 
-  if (readIndex < 2) {
-    // printf("read file:%s failed", tsProcIOFile);
+  if (readIndex < 4) {
     return -1;
   }
 
   return 0;
 }
 
-int32_t taosGetProcIO(float *readKB, float *writeKB) {
-  static int64_t lastReadbyte = -1;
-  static int64_t lastWritebyte = -1;
+int32_t taosGetIOSpeed(double *rchar_per_sec, double *wchar_per_sec, double *read_bytes_per_sec,
+                       double *write_bytes_per_sec) {
+  static int64_t last_rchar = -1;
+  static int64_t last_wchar = -1;
+  static int64_t last_read_bytes = -1;
+  static int64_t last_write_bytes = -1;
+  static int64_t last_time = 0;
 
-  int64_t curReadbyte = 0;
-  int64_t curWritebyte = 0;
+  int64_t cur_rchar = 0;
+  int64_t cur_wchar = 0;
+  int64_t cur_read_bytes = 0;
+  int64_t cur_write_bytes = 0;
+  int64_t cur_time = taosGetTimestampMs();
 
-  if (taosReadProcIO(&curReadbyte, &curWritebyte) != 0) {
+  if (taosReadProcIO(&cur_rchar, &cur_wchar, &cur_read_bytes, &cur_write_bytes) != 0) {
     return -1;
   }
 
-  if (lastReadbyte == -1 || lastWritebyte == -1) {
-    lastReadbyte = curReadbyte;
-    lastWritebyte = curWritebyte;
+  if (last_time == 0 || last_time >= cur_time) {
+    last_time = cur_time;
+    last_rchar = cur_rchar;
+    last_wchar = cur_wchar;
+    last_read_bytes = cur_read_bytes;
+    last_write_bytes = cur_write_bytes;
     return -1;
   }
 
-  *readKB = (float)((double)(curReadbyte - lastReadbyte) / 1024);
-  *writeKB = (float)((double)(curWritebyte - lastWritebyte) / 1024);
-  if (*readKB < 0) *readKB = 0;
-  if (*writeKB < 0) *writeKB = 0;
+  *rchar_per_sec = (cur_rchar - last_rchar) / (double)(cur_time - last_time) * 1000;
+  *wchar_per_sec = (cur_wchar - last_wchar) / (double)(cur_time - last_time) * 1000;
+  *read_bytes_per_sec = (cur_read_bytes - last_read_bytes) / (double)(cur_time - last_time) * 1000;
+  *write_bytes_per_sec = (cur_write_bytes - last_write_bytes) / (double)(cur_time - last_time) * 1000;
+
+  last_time = cur_time;
+  last_rchar = cur_rchar;
+  last_wchar = cur_wchar;
+  last_read_bytes = cur_read_bytes;
+  last_write_bytes = cur_write_bytes;
 
-  lastReadbyte = curReadbyte;
-  lastWritebyte = curWritebyte;
+  if (*rchar_per_sec < 0) *rchar_per_sec = 0;
+  if (*wchar_per_sec < 0) *wchar_per_sec = 0;
+  if (*read_bytes_per_sec < 0) *read_bytes_per_sec = 0;
+  if (*write_bytes_per_sec < 0) *write_bytes_per_sec = 0;
 
   return 0;
 }
@@ -705,10 +671,10 @@ void taosGetSystemInfo() {
   taosGetCpuCores(&tsNumOfCores);
   taosGetTotalMemory(&tsTotalMemoryKB);
 
-  float tmp1, tmp2;
-  taosGetBandSpeed(&tmp1);
+  double tmp1, tmp2, tmp3, tmp4;
+  taosGetBandSpeed(&tmp1, &tmp2);
   taosGetCpuUsage(&tmp1, &tmp2);
-  taosGetProcIO(&tmp1, &tmp2);
+  taosGetIOSpeed(&tmp1, &tmp2, &tmp3, &tmp4);
 }
 
 void taosKillSystem() {