diff --git a/source/libs/sync/inc/syncInt.h b/source/libs/sync/inc/syncInt.h
index 58b32ed025..ae1c4d9e50 100644
--- a/source/libs/sync/inc/syncInt.h
+++ b/source/libs/sync/inc/syncInt.h
@@ -166,21 +166,21 @@ int32_t         syncLogBufferInit(SSyncLogBuffer* pBuf, SSyncNode* pNode);
 int64_t syncLogBufferGetEndIndex(SSyncLogBuffer* pBuf);
 int32_t syncLogBufferAppend(SSyncLogBuffer* pBuf, SSyncNode* pNode, SSyncRaftEntry* pEntry);
 int32_t syncLogBufferAccept(SSyncLogBuffer* pBuf, SSyncNode* pNode, SSyncRaftEntry* pEntry, SyncTerm prevTerm);
-int64_t syncLogBufferLoad(SSyncLogBuffer* pBuf, SSyncNode* pNode, SyncIndex toIndex);
 int64_t syncLogBufferProceed(SSyncLogBuffer* pBuf, SSyncNode* pNode);
 int32_t syncLogBufferCommit(SSyncLogBuffer* pBuf, SSyncNode* pNode, int64_t commitIndex);
-SSyncRaftEntry* syncLogBufferGetOneEntry(SSyncLogBuffer* pBuf, SSyncNode* pNode, SyncIndex index, bool* pInBuf);
 
 int64_t            syncNodeUpdateCommitIndex(SSyncNode* ths, SyncIndex commtIndex);
 SyncAppendEntries* syncLogToAppendEntries(SSyncNode* pNode, SSyncRaftEntry* pEntry, SyncTerm prevLogTerm);
 
 // private
+SSyncRaftEntry* syncLogBufferGetOneEntry(SSyncLogBuffer* pBuf, SSyncNode* pNode, SyncIndex index, bool* pInBuf);
 int32_t syncLogBufferValidate(SSyncLogBuffer* pBuf);
 int32_t syncLogBufferRollback(SSyncLogBuffer* pBuf, SyncIndex toIndex);
 int32_t syncLogBufferReplicate(SSyncLogBuffer* pBuf, SSyncNode* pNode, SSyncRaftEntry* pEntry, SyncTerm prevLogTerm);
-void syncIndexMgrSetIndex(SSyncIndexMgr* pSyncIndexMgr, const SRaftId* pRaftId, SyncIndex index);
 bool syncNodeAgreedUpon(SSyncNode* pNode, SyncIndex index);
 
+void syncIndexMgrSetIndex(SSyncIndexMgr* pSyncIndexMgr, const SRaftId* pRaftId, SyncIndex index);
+
 typedef struct SSyncNode {
   // init by SSyncInfo
   SyncGroupId vgId;
diff --git a/source/libs/sync/src/syncAppendEntries.c b/source/libs/sync/src/syncAppendEntries.c
index 285981012e..1111547a9a 100644
--- a/source/libs/sync/src/syncAppendEntries.c
+++ b/source/libs/sync/src/syncAppendEntries.c
@@ -324,11 +324,11 @@ int32_t syncLogBufferInit(SSyncLogBuffer* pBuf, SSyncNode* pNode) {
     sError("vgId:%d, failed to get snapshot info since %s", pNode->vgId, terrstr());
     goto _err;
   }
-
-  SyncIndex lastVer = pNode->pLogStore->syncLogLastIndex(pNode->pLogStore);
   SyncIndex commitIndex = snapshot.lastApplyIndex;
   SyncTerm  commitTerm = snapshot.lastApplyTerm;
-  SyncIndex toIndex = TMAX(lastVer, commitIndex);
+
+  SyncIndex lastVer = pNode->pLogStore->syncLogLastIndex(pNode->pLogStore);
+  SyncIndex toIndex = lastVer;
   ASSERT(lastVer >= commitIndex);
 
   // update match index
@@ -406,93 +406,6 @@ _err:
   return -1;
 }
 
-int64_t syncLogBufferLoadOld(SSyncLogBuffer* pBuf, SSyncNode* pNode, SyncIndex toIndex) {
-  taosThreadMutexLock(&pBuf->mutex);
-  syncLogBufferValidate(pBuf);
-
-  SSyncLogStore* pLogStore = pNode->pLogStore;
-  ASSERT(pBuf->startIndex <= pBuf->matchIndex);
-  ASSERT(pBuf->matchIndex + 1 == pBuf->endIndex);
-  SyncIndex       index = pBuf->endIndex;
-  SSyncRaftEntry* pMatch = pBuf->entries[(index - 1 + pBuf->size) % pBuf->size].pItem;
-  ASSERT(pMatch != NULL);
-
-  while (index - pBuf->startIndex < pBuf->size && index <= toIndex) {
-    SSyncRaftEntry* pEntry = NULL;
-    if (pLogStore->syncLogGetEntry(pLogStore, index, &pEntry) < 0) {
-      sError("vgId:%d, failed to get log entry since %s. index:%" PRId64 "", pNode->vgId, terrstr(), index);
-      ASSERT(0);
-      break;
-    }
-    ASSERT(pMatch->index + 1 == pEntry->index);
-    SSyncLogBufEntry tmp = {.pItem = pEntry, .prevLogIndex = pMatch->index, .prevLogTerm = pMatch->term};
-    pBuf->entries[pBuf->endIndex % pBuf->size] = tmp;
-
-    sInfo("vgId:%d, loaded log entry into log buffer. index: %" PRId64 ", term: %" PRId64, pNode->vgId, pEntry->index,
-          pEntry->term);
-
-    pBuf->matchIndex = index;
-    pBuf->endIndex = index + 1;
-    pMatch = pEntry;
-    index++;
-  }
-
-  syncLogBufferValidate(pBuf);
-  taosThreadMutexUnlock(&pBuf->mutex);
-  return index;
-}
-
-int32_t syncLogBufferInitOld(SSyncLogBuffer* pBuf, SSyncNode* pNode) {
-  taosThreadMutexLock(&pBuf->mutex);
-  ASSERT(pNode->pLogStore != NULL && "log store not created");
-  ASSERT(pNode->pFsm != NULL && "pFsm not registered");
-  ASSERT(pNode->pFsm->FpGetSnapshotInfo != NULL && "FpGetSnapshotInfo not registered");
-
-  SSnapshot snapshot;
-  if (pNode->pFsm->FpGetSnapshotInfo(pNode->pFsm, &snapshot) < 0) {
-    sError("vgId:%d, failed to get snapshot info since %s", pNode->vgId, terrstr());
-    goto _err;
-  }
-  SyncIndex commitIndex = snapshot.lastApplyIndex;
-  SyncTerm  commitTerm = snapshot.lastApplyTerm;
-
-  // init log buffer indexes
-  pBuf->startIndex = commitIndex;
-  pBuf->matchIndex = commitIndex;
-  pBuf->commitIndex = commitIndex;
-  pBuf->endIndex = commitIndex + 1;
-
-  // put a dummy record at initial commitIndex
-  SSyncRaftEntry* pDummy = syncEntryBuildDummy(commitTerm, commitIndex, pNode->vgId);
-  if (pDummy == NULL) {
-    terrno = TSDB_CODE_OUT_OF_MEMORY;
-    goto _err;
-  }
-  SSyncLogBufEntry tmp = {.pItem = pDummy, .prevLogIndex = commitIndex - 1, .prevLogTerm = commitTerm};
-  pBuf->entries[(commitIndex + pBuf->size) % pBuf->size] = tmp;
-
-  taosThreadMutexUnlock(&pBuf->mutex);
-  return 0;
-
-_err:
-  taosThreadMutexUnlock(&pBuf->mutex);
-  return -1;
-}
-
-int32_t syncLogBufferRollbackMatchIndex(SSyncLogBuffer* pBuf, SSyncNode* pNode, SyncIndex toIndex) {
-  if (toIndex <= pBuf->commitIndex) {
-    sError("vgId:%d, cannot rollback across commit index:%" PRId64 ", to index:%" PRId64 "", pNode->vgId,
-           pBuf->commitIndex, toIndex);
-    return -1;
-  }
-
-  pBuf->matchIndex = TMIN(pBuf->matchIndex, toIndex - 1);
-
-  // update my match index
-  syncIndexMgrSetIndex(pNode->pMatchIndex, &pNode->myRaftId, pBuf->matchIndex);
-  return 0;
-}
-
 FORCE_INLINE SyncTerm syncLogBufferGetLastMatchTerm(SSyncLogBuffer* pBuf) {
   SyncIndex       index = pBuf->matchIndex;
   SSyncRaftEntry* pEntry = pBuf->entries[(index + pBuf->size) % pBuf->size].pItem;
@@ -509,26 +422,25 @@ int32_t syncLogBufferAccept(SSyncLogBuffer* pBuf, SSyncNode* pNode, SSyncRaftEnt
   SyncTerm  lastMatchTerm = syncLogBufferGetLastMatchTerm(pBuf);
 
   if (index <= pBuf->commitIndex) {
-    sInfo("vgId:%d, raft entry already committed. index: %" PRId64 ", term: %" PRId64 ". log buffer: [%" PRId64
-          " %" PRId64 " %" PRId64 ", %" PRId64 ")",
-          pNode->vgId, pEntry->index, pEntry->term, pBuf->startIndex, pBuf->commitIndex, pBuf->matchIndex,
-          pBuf->endIndex);
+    sDebug("vgId:%d, raft entry already committed. index: %" PRId64 ", term: %" PRId64 ". log buffer: [%" PRId64
+           " %" PRId64 " %" PRId64 ", %" PRId64 ")",
+           pNode->vgId, pEntry->index, pEntry->term, pBuf->startIndex, pBuf->commitIndex, pBuf->matchIndex,
+           pBuf->endIndex);
     ret = 0;
     goto _out;
   }
 
   if (index - pBuf->startIndex >= pBuf->size) {
-    sInfo("vgId:%d, raft entry out of buffer capacity. index: %" PRId64 ", term: %" PRId64 ". log buffer: [%" PRId64
-          " %" PRId64 " %" PRId64 ", %" PRId64 ")",
-          pNode->vgId, pEntry->index, pEntry->term, pBuf->startIndex, pBuf->commitIndex, pBuf->matchIndex,
-          pBuf->endIndex);
+    sDebug("vgId:%d, raft entry out of buffer capacity. index: %" PRId64 ", term: %" PRId64 ". log buffer: [%" PRId64
+           " %" PRId64 " %" PRId64 ", %" PRId64 ")",
+           pNode->vgId, pEntry->index, pEntry->term, pBuf->startIndex, pBuf->commitIndex, pBuf->matchIndex,
+           pBuf->endIndex);
     goto _out;
   }
 
   if (index > pBuf->matchIndex && lastMatchTerm != prevTerm) {
-    sInfo("vgId:%d, not ready to accept raft entry (i.e. across barrier). index: %" PRId64 ", term: %" PRId64
-          ": prevterm: %" PRId64 " /= lastmatch: %" PRId64 ". log buffer: [%" PRId64 " %" PRId64 " %" PRId64
-          ", %" PRId64 ")",
+    sInfo("vgId:%d, not ready to accept raft entry. index: %" PRId64 ", term: %" PRId64 ": prevterm: %" PRId64
+          " != lastmatch: %" PRId64 ". log buffer: [%" PRId64 " %" PRId64 " %" PRId64 ", %" PRId64 ")",
           pNode->vgId, pEntry->index, pEntry->term, prevTerm, lastMatchTerm, pBuf->startIndex, pBuf->commitIndex,
           pBuf->matchIndex, pBuf->endIndex);
     goto _out;
@@ -542,10 +454,10 @@ int32_t syncLogBufferAccept(SSyncLogBuffer* pBuf, SSyncNode* pNode, SSyncRaftEnt
     if (pEntry->term != pExist->term) {
       (void)syncLogBufferRollback(pBuf, index);
     } else {
-      sInfo("vgId:%d, duplicate raft entry received. index: %" PRId64 ", term: %" PRId64 ". log buffer: [%" PRId64
-            " %" PRId64 " %" PRId64 ", %" PRId64 ")",
-            pNode->vgId, pEntry->index, pEntry->term, pBuf->startIndex, pBuf->commitIndex, pBuf->matchIndex,
-            pBuf->endIndex);
+      sDebug("vgId:%d, duplicate raft entry received. index: %" PRId64 ", term: %" PRId64 ". log buffer: [%" PRId64
+             " %" PRId64 " %" PRId64 ", %" PRId64 ")",
+             pNode->vgId, pEntry->index, pEntry->term, pBuf->startIndex, pBuf->commitIndex, pBuf->matchIndex,
+             pBuf->endIndex);
       SyncTerm existPrevTerm = pBuf->entries[index % pBuf->size].prevLogTerm;
       ASSERT(pEntry->term == pExist->term && prevTerm == existPrevTerm);
       ret = 0;
@@ -647,8 +559,8 @@ int64_t syncLogBufferProceed(SSyncLogBuffer* pBuf, SSyncNode* pNode) {
     // increase match index
     pBuf->matchIndex = index;
 
-    sInfo("vgId:%d, log buffer proceed. start index: %" PRId64 ", match index: %" PRId64 ", end index: %" PRId64,
-          pNode->vgId, pBuf->startIndex, pBuf->matchIndex, pBuf->endIndex);
+    sDebug("vgId:%d, log buffer proceed. start index: %" PRId64 ", match index: %" PRId64 ", end index: %" PRId64,
+           pNode->vgId, pBuf->startIndex, pBuf->matchIndex, pBuf->endIndex);
 
     // replicate on demand
     (void)syncNodeReplicate(pNode);
@@ -759,8 +671,8 @@ int32_t syncLogBufferCommit(SSyncLogBuffer* pBuf, SSyncNode* pNode, int64_t comm
     }
     pBuf->commitIndex = index;
 
-    sInfo("vgId:%d, committed index: %" PRId64 ", term: %" PRId64 ", role: %d, current term: %" PRId64 "", pNode->vgId,
-          pEntry->index, pEntry->term, role, term);
+    sDebug("vgId:%d, committed index: %" PRId64 ", term: %" PRId64 ", role: %d, current term: %" PRId64 "", pNode->vgId,
+           pEntry->index, pEntry->term, role, term);
 
     if (!inBuf) {
       syncEntryDestroy(pEntry);
@@ -784,8 +696,8 @@ _out:
   if (!pNode->restoreFinish && pBuf->commitIndex >= pNode->commitIndex) {
     pNode->pFsm->FpRestoreFinishCb(pNode->pFsm);
     pNode->restoreFinish = true;
-    sInfo("vgId:%d, restore finished. commit index:%" PRId64 ", match index:%" PRId64 ", last index:%" PRId64 "",
-          pNode->vgId, pBuf->commitIndex, pBuf->matchIndex, pBuf->endIndex - 1);
+    sInfo("vgId:%d, restore finished. pBuf: [%" PRId64 " %" PRId64 " %" PRId64 ", %" PRId64 ")", pNode->vgId,
+          pBuf->startIndex, pBuf->commitIndex, pBuf->matchIndex, pBuf->endIndex);
   }
 
   if (!inBuf) {
@@ -799,6 +711,7 @@ _out:
 
 int32_t syncNodeOnAppendEntries(SSyncNode* ths, SyncAppendEntries* pMsg) {
   SyncAppendEntriesReply* pReply = NULL;
+  bool                    accepted = false;
   // if already drop replica, do not process
   if (!syncNodeInRaftGroup(ths, &(pMsg->srcId))) {
     syncLogRecvAppendEntries(ths, pMsg, "not in my config");
@@ -847,20 +760,21 @@ int32_t syncNodeOnAppendEntries(SSyncNode* ths, SyncAppendEntries* pMsg) {
     goto _IGNORE;
   }
 
-  sInfo("vgId:%d, recv append entries msg. index:%" PRId64 ", term:%" PRId64 ", preLogIndex:%" PRId64
-        ", prevLogTerm:%" PRId64 " commitIndex:%" PRId64 "",
-        pMsg->vgId, pMsg->prevLogIndex + 1, pMsg->term, pMsg->prevLogIndex, pMsg->prevLogTerm, pMsg->commitIndex);
+  sDebug("vgId:%d, recv append entries msg. index:%" PRId64 ", term:%" PRId64 ", preLogIndex:%" PRId64
+         ", prevLogTerm:%" PRId64 " commitIndex:%" PRId64 "",
+         pMsg->vgId, pMsg->prevLogIndex + 1, pMsg->term, pMsg->prevLogIndex, pMsg->prevLogTerm, pMsg->commitIndex);
 
   // accept
   if (syncLogBufferAccept(ths->pLogBuf, ths, pEntry, pMsg->prevLogTerm) < 0) {
     goto _SEND_RESPONSE;
   }
+  accepted = true;
 
 _SEND_RESPONSE:
   pReply->matchIndex = syncLogBufferProceed(ths->pLogBuf, ths);
   bool matched = (pReply->matchIndex >= pReply->lastSendIndex);
-  pReply->success = matched;
-  if (matched) {
+  if (accepted && matched) {
+    pReply->success = true;
     // update commit index only after matching
     (void)syncNodeUpdateCommitIndex(ths, pMsg->commitIndex);
   }
diff --git a/source/libs/sync/src/syncAppendEntriesReply.c b/source/libs/sync/src/syncAppendEntriesReply.c
index 86d8ec11b9..ef20153fa7 100644
--- a/source/libs/sync/src/syncAppendEntriesReply.c
+++ b/source/libs/sync/src/syncAppendEntriesReply.c
@@ -96,8 +96,8 @@ int64_t syncNodeCheckCommitIndex(SSyncNode* ths, SyncIndex indexLikely) {
   if (indexLikely > ths->commitIndex && syncNodeAgreedUpon(ths, indexLikely)) {
     SyncIndex commitIndex = indexLikely;
     syncNodeUpdateCommitIndex(ths, commitIndex);
-    sInfo("vgId:%d, agreed upon. role:%d, term:%" PRId64 ", index: %" PRId64 "", ths->vgId, ths->state,
-          ths->pRaftStore->currentTerm, commitIndex);
+    sDebug("vgId:%d, agreed upon. role:%d, term:%" PRId64 ", index: %" PRId64 "", ths->vgId, ths->state,
+           ths->pRaftStore->currentTerm, commitIndex);
   }
   return ths->commitIndex;
 }
@@ -140,7 +140,7 @@ int32_t syncLogBufferReplicateOneTo(SSyncLogReplMgr* pMgr, SSyncNode* pNode, Syn
   SyncTerm           prevLogTerm = -1;
   SSyncLogBuffer*    pBuf = pNode->pLogBuf;
 
-  sInfo("vgId:%d, replicate one msg index: %" PRId64 " to dest: 0x%016" PRIx64, pNode->vgId, index, pDestId->addr);
+  sDebug("vgId:%d, replicate one msg index: %" PRId64 " to dest: 0x%016" PRIx64, pNode->vgId, index, pDestId->addr);
 
   pEntry = syncLogBufferGetOneEntry(pBuf, pNode, index, &inBuf);
   if (pEntry == NULL) {
@@ -199,8 +199,8 @@ int32_t syncNodeOnAppendEntriesReply(SSyncNode* ths, SyncAppendEntriesReply* pMs
 
     ASSERT(pMsg->term == ths->pRaftStore->currentTerm);
 
-    sInfo("vgId:%d received append entries reply. srcId:0x%016" PRIx64 ",  term:%" PRId64 ", matchIndex:%" PRId64 "",
-          pMsg->vgId, pMsg->srcId.addr, pMsg->term, pMsg->matchIndex);
+    sDebug("vgId:%d received append entries reply. srcId:0x%016" PRIx64 ",  term:%" PRId64 ", matchIndex:%" PRId64 "",
+           pMsg->vgId, pMsg->srcId.addr, pMsg->term, pMsg->matchIndex);
 
     if (pMsg->success) {
       SyncIndex oldMatchIndex = syncIndexMgrGetIndex(ths->pMatchIndex, &(pMsg->srcId));
@@ -216,7 +216,7 @@ int32_t syncNodeOnAppendEntriesReply(SSyncNode* ths, SyncAppendEntriesReply* pMs
 
     // replicate log
     SSyncLogReplMgr* pMgr = syncNodeGetLogReplMgr(ths, &pMsg->srcId);
-    ASSERT(pMgr != NULL);
+    // ASSERT(pMgr != NULL);
     if (pMgr != NULL) {
       (void)syncLogReplMgrProcessReply(pMgr, ths, pMsg);
     }
diff --git a/source/libs/sync/src/syncCommit.c b/source/libs/sync/src/syncCommit.c
index a96fa31f83..6ba1867635 100644
--- a/source/libs/sync/src/syncCommit.c
+++ b/source/libs/sync/src/syncCommit.c
@@ -51,93 +51,6 @@ void syncMaybeAdvanceCommitIndex(SSyncNode* pSyncNode) {
     return;
   }
 
-  // update commit index
-  SyncIndex newCommitIndex = pSyncNode->commitIndex;
-  for (SyncIndex index = syncNodeGetLastIndex(pSyncNode); index > pSyncNode->commitIndex; --index) {
-    bool agree = syncAgree(pSyncNode, index);
-
-    if (agree) {
-      // term
-      SSyncRaftEntry* pEntry = NULL;
-      SLRUCache*      pCache = pSyncNode->pLogStore->pCache;
-      LRUHandle*      h = taosLRUCacheLookup(pCache, &index, sizeof(index));
-      if (h) {
-        pEntry = (SSyncRaftEntry*)taosLRUCacheValue(pCache, h);
-      } else {
-        int32_t code = pSyncNode->pLogStore->syncLogGetEntry(pSyncNode->pLogStore, index, &pEntry);
-        if (code != 0) {
-          char logBuf[128];
-          snprintf(logBuf, sizeof(logBuf), "advance commit index error, read wal index:%" PRId64, index);
-          syncNodeErrorLog(pSyncNode, logBuf);
-          return;
-        }
-      }
-      // cannot commit, even if quorum agree. need check term!
-      if (pEntry->term <= pSyncNode->pRaftStore->currentTerm) {
-        // update commit index
-        newCommitIndex = index;
-
-        if (h) {
-          taosLRUCacheRelease(pCache, h, false);
-        } else {
-          syncEntryDestroy(pEntry);
-        }
-
-        break;
-      } else {
-        do {
-          char logBuf[128];
-          snprintf(logBuf, sizeof(logBuf), "can not commit due to term not equal, index:%" PRId64 ", term:%" PRIu64,
-                   pEntry->index, pEntry->term);
-          syncNodeEventLog(pSyncNode, logBuf);
-        } while (0);
-      }
-
-      if (h) {
-        taosLRUCacheRelease(pCache, h, false);
-      } else {
-        syncEntryDestroy(pEntry);
-      }
-    }
-  }
-
-  // advance commit index as large as possible
-  SyncIndex walCommitVer = logStoreWalCommitVer(pSyncNode->pLogStore);
-  if (walCommitVer > newCommitIndex) {
-    newCommitIndex = walCommitVer;
-  }
-
-  // maybe execute fsm
-  if (newCommitIndex > pSyncNode->commitIndex) {
-    SyncIndex beginIndex = pSyncNode->commitIndex + 1;
-    SyncIndex endIndex = newCommitIndex;
-
-    // update commit index
-    pSyncNode->commitIndex = newCommitIndex;
-
-    // call back Wal
-    pSyncNode->pLogStore->syncLogUpdateCommitIndex(pSyncNode->pLogStore, pSyncNode->commitIndex);
-
-    // execute fsm
-    if (pSyncNode->pFsm != NULL) {
-      int32_t code = syncNodeDoCommit(pSyncNode, beginIndex, endIndex, pSyncNode->state);
-      if (code != 0) {
-        char logBuf[128];
-        snprintf(logBuf, sizeof(logBuf), "advance commit index error, do commit begin:%" PRId64 ", end:%" PRId64,
-                 beginIndex, endIndex);
-        syncNodeErrorLog(pSyncNode, logBuf);
-        return;
-      }
-    }
-  }
-}
-
-void syncMaybeAdvanceCommitIndexOld(SSyncNode* pSyncNode) {
-  if (pSyncNode->state != TAOS_SYNC_STATE_LEADER) {
-    syncNodeErrorLog(pSyncNode, "not leader, can not advance commit index");
-    return;
-  }
-
   // advance commit index to sanpshot first
   SSnapshot snapshot;
   pSyncNode->pFsm->FpGetSnapshotInfo(pSyncNode->pFsm, &snapshot);
diff --git a/source/libs/sync/src/syncElection.c b/source/libs/sync/src/syncElection.c
index b428f4d2f2..a287727a39 100644
--- a/source/libs/sync/src/syncElection.c
+++ b/source/libs/sync/src/syncElection.c
@@ -111,4 +111,4 @@ int32_t syncNodeSendRequestVote(SSyncNode* pSyncNode, const SRaftId* destRaftId,
   syncRequestVote2RpcMsg(pMsg, &rpcMsg);
   syncNodeSendMsgById(destRaftId, pSyncNode, &rpcMsg);
   return ret;
-}
\ No newline at end of file
+}
diff --git a/source/libs/sync/src/syncMain.c b/source/libs/sync/src/syncMain.c
index f9f6760e8c..aaed6a10d0 100644
--- a/source/libs/sync/src/syncMain.c
+++ b/source/libs/sync/src/syncMain.c
@@ -1116,6 +1116,8 @@ int32_t syncLogResetLogReplMgr(SSyncLogReplMgr* pMgr) {
   return 0;
 }
 
+_Atomic int64_t tsRetryCnt = 0;
+
 int32_t syncLogReplMgrRetryOnNeed(SSyncLogReplMgr* pMgr, SSyncNode* pNode) {
   if (pMgr->endIndex <= pMgr->startIndex) {
     return 0;
@@ -1147,6 +1149,7 @@ int32_t syncLogReplMgrRetryOnNeed(SSyncLogReplMgr* pMgr, SSyncNode* pNode) {
     pMgr->states[pos].timeMs = nowMs;
     pMgr->states[pos].acked = false;
     retried = true;
+    tsRetryCnt++;
   }
 
   ret = 0;
@@ -1185,10 +1188,10 @@ int32_t syncLogReplMgrProcessReplyInRecoveryMode(SSyncLogReplMgr* pMgr, SSyncNod
     (void)syncLogResetLogReplMgr(pMgr);
   }
 
+  // send match index
   SyncIndex index = TMIN(pMsg->matchIndex, pNode->pLogBuf->matchIndex);
   bool      barrier = false;
   ASSERT(index >= 0);
-  // send match index
   if (syncLogBufferReplicateOneTo(pMgr, pNode, index, &destId, &barrier) < 0) {
     sError("vgId:%d, failed to replicate log entry since %s. index: %" PRId64 ", dest: 0x%016" PRIx64 "", pNode->vgId,
            terrstr(), index, destId.addr);
@@ -1206,6 +1209,17 @@ int32_t syncLogReplMgrProcessReplyInRecoveryMode(SSyncLogReplMgr* pMgr, SSyncNod
   return 0;
 }
 
+int32_t syncLogReplMgrProcessHeartbeatReply(SSyncLogReplMgr* pMgr, SSyncNode* pNode, SyncHeartbeatReply* pMsg) {
+  SSyncLogBuffer* pBuf = pNode->pLogBuf;
+  taosThreadMutexLock(&pBuf->mutex);
+  if (pMsg->startTime != pMgr->peerStartTime) {
+    syncLogResetLogReplMgr(pMgr);
+    pMgr->peerStartTime = pMsg->startTime;
+  }
+  taosThreadMutexUnlock(&pBuf->mutex);
+  return 0;
+}
+
 int32_t syncLogReplMgrProcessReply(SSyncLogReplMgr* pMgr, SSyncNode* pNode, SyncAppendEntriesReply* pMsg) {
   SSyncLogBuffer* pBuf = pNode->pLogBuf;
   taosThreadMutexLock(&pBuf->mutex);
@@ -1245,17 +1259,19 @@ int32_t syncLogReplMgrReplicateProbeOnce(SSyncLogReplMgr* pMgr, SSyncNode* pNode
   }
 
   SSyncLogBuffer* pBuf = pNode->pLogBuf;
-  sInfo("vgId:%d, attempted to probe the %d'th peer. pMgr(restored:%d): [%" PRId64 " %" PRId64 ", %" PRId64
+  sInfo("vgId:%d, attempted to probe the %d'th peer. pMgr(rs:%d): [%" PRId64 " %" PRId64 ", %" PRId64
         "), pBuf: [%" PRId64 " %" PRId64 " %" PRId64 ", %" PRId64 ")",
         pNode->vgId, pMgr->peerId, pMgr->restored, pMgr->startIndex, pMgr->matchIndex, pMgr->endIndex, pBuf->startIndex,
         pBuf->commitIndex, pBuf->matchIndex, pBuf->endIndex);
   return 0;
 }
 
+_Atomic int64_t tsSendCnt = 0;
+
 int32_t syncLogReplMgrReplicateAttemptedOnce(SSyncLogReplMgr* pMgr, SSyncNode* pNode) {
   ASSERT(pMgr->restored);
   SRaftId* pDestId = &pNode->replicasId[pMgr->peerId];
-  int32_t  batchSize = TMAX(1, pMgr->size / 10);
+  int32_t  batchSize = TMAX(1, pMgr->size / 20);
   int32_t  count = 0;
 
   for (SyncIndex index = pMgr->endIndex; index <= pNode->pLogBuf->matchIndex; index++) {
@@ -1278,16 +1294,17 @@ int32_t syncLogReplMgrReplicateAttemptedOnce(SSyncLogReplMgr* pMgr, SSyncNode* p
     pMgr->states[pos].acked = false;
 
     pMgr->endIndex = index + 1;
+    tsSendCnt++;
     if (barrier) {
       break;
     }
   }
 
   SSyncLogBuffer* pBuf = pNode->pLogBuf;
-  sInfo("vgId:%d, attempted to replicate %d msgs to the %d'th peer. pMgr(restored:%d): [%" PRId64 " %" PRId64
-        ", %" PRId64 "), pBuf: [%" PRId64 " %" PRId64 " %" PRId64 ", %" PRId64 ")",
-        pNode->vgId, count, pMgr->peerId, pMgr->restored, pMgr->startIndex, pMgr->matchIndex, pMgr->endIndex,
-        pBuf->startIndex, pBuf->commitIndex, pBuf->matchIndex, pBuf->endIndex);
+  sDebug("vgId:%d, attempted to replicate %d msgs to the %d'th peer. pMgr(rs:%d): [%" PRId64 " %" PRId64 ", %" PRId64
+         "), pBuf: [%" PRId64 " %" PRId64 " %" PRId64 ", %" PRId64 ")",
+         pNode->vgId, count, pMgr->peerId, pMgr->restored, pMgr->startIndex, pMgr->matchIndex, pMgr->endIndex,
+         pBuf->startIndex, pBuf->commitIndex, pBuf->matchIndex, pBuf->endIndex);
   syncLogReplMgrRetryOnNeed(pMgr, pNode);
   return 0;
 }
@@ -1704,18 +1721,13 @@ int32_t syncNodeRestore(SSyncNode* pSyncNode) {
   SyncIndex commitIndex = pSyncNode->pLogStore->syncLogCommitIndex(pSyncNode->pLogStore);
   SyncIndex endIndex = pSyncNode->pLogBuf->endIndex;
 
+  ASSERT(endIndex == lastVer + 1);
   commitIndex = TMAX(pSyncNode->commitIndex, commitIndex);
 
   if (syncLogBufferCommit(pSyncNode->pLogBuf, pSyncNode, commitIndex) < 0) {
     return -1;
   }
 
-  if (endIndex <= lastVer) {
-    sError("vgId:%d, failed to load log entries into log buffers. commit index:%" PRId64 ", lastVer: %" PRId64 "",
-           pSyncNode->vgId, commitIndex, lastVer);
-    return -1;
-  }
-
   return 0;
 }
 
@@ -2722,9 +2734,8 @@ int32_t syncLogBufferReset(SSyncLogBuffer* pBuf, SSyncNode* pNode) {
 
   (void)syncLogBufferRollback(pBuf, pBuf->matchIndex + 1);
 
-  sInfo("vgId:%d, reset log buffer. start index: %" PRId64 ", commit index: %" PRId64 ", match Index: %" PRId64
-        ", end index: %" PRId64 "",
-        pNode->vgId, pBuf->startIndex, pBuf->commitIndex, pBuf->matchIndex, pBuf->endIndex);
+  sInfo("vgId:%d, reset log buffer. pBuf: [%" PRId64 " %" PRId64 " %" PRId64 ", %" PRId64 ")", pNode->vgId,
+        pBuf->startIndex, pBuf->commitIndex, pBuf->matchIndex, pBuf->endIndex);
 
   pBuf->endIndex = pBuf->matchIndex + 1;
 
@@ -3380,10 +3391,10 @@ int32_t syncNodeAppend(SSyncNode* ths, SSyncRaftEntry* pEntry) {
   // proceed match index, with replicating on needed
   SyncIndex matchIndex = syncLogBufferProceed(ths->pLogBuf, ths);
 
-  sInfo("vgId:%d, append raft log index: %" PRId64 ", term: %" PRId64 " log buffer: [%" PRId64 " %" PRId64 " %" PRId64
-        ", %" PRId64 ")",
-        ths->vgId, pEntry->index, pEntry->term, ths->pLogBuf->startIndex, ths->pLogBuf->commitIndex,
-        ths->pLogBuf->matchIndex, ths->pLogBuf->endIndex);
+  sDebug("vgId:%d, append raft entry. index: %" PRId64 ", term: %" PRId64 " pBuf: [%" PRId64 " %" PRId64 " %" PRId64
+         ", %" PRId64 ")",
+         ths->vgId, pEntry->index, pEntry->term, ths->pLogBuf->startIndex, ths->pLogBuf->commitIndex,
+         ths->pLogBuf->matchIndex, ths->pLogBuf->endIndex);
 
   // multi replica
   if (ths->replicaNum > 1) {
@@ -3521,6 +3532,15 @@ int32_t syncNodeOnHeartbeat(SSyncNode* ths, SyncHeartbeat* pMsg) {
 }
 
 int32_t syncNodeOnHeartbeatReply(SSyncNode* ths, SyncHeartbeatReply* pMsg) {
+  SSyncLogReplMgr* pMgr = syncNodeGetLogReplMgr(ths, &pMsg->srcId);
+  if (pMgr == NULL) {
+    sError("vgId:%d, failed to get log repl mgr for the peer at addr 0x016%" PRIx64 "", ths->vgId, pMsg->srcId.addr);
+    return -1;
+  }
+  return syncLogReplMgrProcessHeartbeatReply(pMgr, ths, pMsg);
+}
+
+int32_t syncNodeOnHeartbeatReplyOld(SSyncNode* ths, SyncHeartbeatReply* pMsg) {
   syncLogRecvHeartbeatReply(ths, pMsg, "");
 
   // update last reply time, make decision whether the other node is alive or not
diff --git a/source/libs/sync/src/syncReplication.c b/source/libs/sync/src/syncReplication.c
index 3dcd2d8cdf..1c4b997875 100644
--- a/source/libs/sync/src/syncReplication.c
+++ b/source/libs/sync/src/syncReplication.c
@@ -173,8 +173,8 @@ int32_t syncNodeReplicateOld(SSyncNode* pSyncNode) {
 }
 
 int32_t syncNodeSendAppendEntries(SSyncNode* pSyncNode, SRaftId* destRaftId, SyncAppendEntries* pMsg) {
-  sInfo("vgId:%d, send append entries msg index: %" PRId64 " to dest: 0x%016" PRId64, pSyncNode->vgId,
-        pMsg->prevLogIndex + 1, destRaftId->addr);
+  sTrace("vgId:%d, send append entries msg index: %" PRId64 " to dest: 0x%016" PRId64, pSyncNode->vgId,
+         pMsg->prevLogIndex + 1, destRaftId->addr);
   int32_t ret = 0;
   pMsg->destId = *destRaftId;
   SRpcMsg rpcMsg;
diff --git a/source/libs/sync/src/syncTimeout.c b/source/libs/sync/src/syncTimeout.c
index 17c8c14136..3fe7f08816 100644
--- a/source/libs/sync/src/syncTimeout.c
+++ b/source/libs/sync/src/syncTimeout.c
@@ -135,4 +135,4 @@ int32_t syncNodeOnTimer(SSyncNode* ths, SyncTimeout* pMsg) {
   }
 
   return ret;
-}
\ No newline at end of file
+}