diff --git a/include/libs/sync/sync.h b/include/libs/sync/sync.h
index 1f71c242ae44a0be62dcd2e642376a2b350033ac..c8213160d23c83cc20d6044dc548c6557b78c408 100644
--- a/include/libs/sync/sync.h
+++ b/include/libs/sync/sync.h
@@ -141,6 +141,21 @@ typedef struct SSyncLogStore {
   // return commit index of log
   SyncIndex (*getCommitIndex)(struct SSyncLogStore* pLogStore);
 
+  // refactor, log[0 .. n] ==> log[m .. n]
+  int32_t (*syncLogSetBeginIndex)(struct SSyncLogStore* pLogStore, SyncIndex beginIndex);
+  SyncIndex (*syncLogBeginIndex)(struct SSyncLogStore* pLogStore);
+  SyncIndex (*syncLogEndIndex)(struct SSyncLogStore* pLogStore);
+  bool (*syncLogIsEmpty)(struct SSyncLogStore* pLogStore);
+  int32_t (*syncLogEntryCount)(struct SSyncLogStore* pLogStore);
+  bool (*syncLogInRange)(struct SSyncLogStore* pLogStore, SyncIndex index);
+
+  SyncIndex (*syncLogLastIndex)(struct SSyncLogStore* pLogStore);
+  SyncTerm (*syncLogLastTerm)(struct SSyncLogStore* pLogStore);
+
+  int32_t (*syncLogAppendEntry)(struct SSyncLogStore* pLogStore, SSyncRaftEntry* pEntry);
+  int32_t (*syncLogGetEntry)(struct SSyncLogStore* pLogStore, SyncIndex index, SSyncRaftEntry** ppEntry);
+  int32_t (*syncLogTruncate)(struct SSyncLogStore* pLogStore, SyncIndex fromIndex);
+
 } SSyncLogStore;
 
 typedef struct SSyncInfo {
diff --git a/source/libs/sync/inc/syncInt.h b/source/libs/sync/inc/syncInt.h
index 3f5c081f4af3b95c53a54da8efcd2ed678cf46f4..4fedcdb3b13f88b3355be4569c3c4581ad405c6d 100644
--- a/source/libs/sync/inc/syncInt.h
+++ b/source/libs/sync/inc/syncInt.h
@@ -212,9 +212,14 @@ void syncNodeVoteForTerm(SSyncNode* pSyncNode, SyncTerm term, SRaftId* pRaftId);
 void syncNodeVoteForSelf(SSyncNode* pSyncNode);
 
 // snapshot --------------
-bool    syncNodeIsIndexInSnapshot(SSyncNode* pSyncNode, SyncIndex index);
-int32_t syncNodeGetLastIndexTerm(SSyncNode* pSyncNode, SyncIndex* pLastIndex, SyncTerm* pLastTerm);
-int32_t syncNodeGetPreIndexTerm(SSyncNode* pSyncNode, SyncIndex index, SyncIndex* pPreIndex, SyncTerm* pPreTerm);
+bool      syncNodeHasSnapshot(SSyncNode* pSyncNode);
+bool      syncNodeIsIndexInSnapshot(SSyncNode* pSyncNode, SyncIndex index);
+SyncIndex syncNodeGetLastIndex(SSyncNode* pSyncNode);
+SyncTerm  syncNodeGetLastTerm(SSyncNode* pSyncNode);
+int32_t   syncNodeGetLastIndexTerm(SSyncNode* pSyncNode, SyncIndex* pLastIndex, SyncTerm* pLastTerm);
+SyncIndex syncNodeGetPreIndex(SSyncNode* pSyncNode, SyncIndex index);
+SyncTerm  syncNodeGetPreITerm(SSyncNode* pSyncNode, SyncIndex index);
+int32_t   syncNodeGetPreIndexTerm(SSyncNode* pSyncNode, SyncIndex index, SyncIndex* pPreIndex, SyncTerm* pPreTerm);
 
 // for debug --------------
 void syncNodePrint(SSyncNode* pObj);
diff --git a/source/libs/sync/inc/syncRaftLog.h b/source/libs/sync/inc/syncRaftLog.h
index b54cd14ccdf5fe9e613dcf639caa20a0b0cdf35b..aec1f77b420b595b0d0393e02f472de7f6eda101 100644
--- a/source/libs/sync/inc/syncRaftLog.h
+++ b/source/libs/sync/inc/syncRaftLog.h
@@ -30,6 +30,7 @@ extern "C" {
 typedef struct SSyncLogStoreData {
   SSyncNode* pSyncNode;
   SWal*      pWal;
+  SyncIndex  beginIndex;  // valid begin index, default 0, may be set beginIndex > 0
 } SSyncLogStoreData;
 
 SSyncLogStore* logStoreCreate(SSyncNode* pSyncNode);
@@ -41,15 +42,6 @@ char*          logStoreSimple2Str(SSyncLogStore* pLogStore);
 
 SyncIndex logStoreFirstIndex(SSyncLogStore* pLogStore);
 
-// SSyncRaftEntry* logStoreGetLastEntry(SSyncLogStore* pLogStore);
-// SyncIndex       logStoreLastIndex(SSyncLogStore* pLogStore);
-// SyncTerm        logStoreLastTerm(SSyncLogStore* pLogStore);
-// SSyncRaftEntry* logStoreGetEntry(SSyncLogStore* pLogStore, SyncIndex index);
-// int32_t         logStoreAppendEntry(SSyncLogStore* pLogStore, SSyncRaftEntry* pEntry);
-// int32_t         logStoreTruncate(SSyncLogStore* pLogStore, SyncIndex fromIndex);
-// int32_t         logStoreUpdateCommitIndex(SSyncLogStore* pLogStore, SyncIndex index);
-// SyncIndex       logStoreGetCommitIndex(SSyncLogStore* pLogStore);
-
 // for debug
 void logStorePrint(SSyncLogStore* pLogStore);
 void logStorePrint2(char* s, SSyncLogStore* pLogStore);
diff --git a/source/libs/sync/src/syncIO.c b/source/libs/sync/src/syncIO.c
index 4e814c41f35252b955c78f6382dc377e4a4ecac3..13d1a94b19d5d0e5d83193f3fd5f24a036a772d9 100644
--- a/source/libs/sync/src/syncIO.c
+++ b/source/libs/sync/src/syncIO.c
@@ -30,7 +30,7 @@ static int32_t  syncIODestroy(SSyncIO *io);
 static int32_t  syncIOStartInternal(SSyncIO *io);
 static int32_t  syncIOStopInternal(SSyncIO *io);
 
-static void   *syncIOConsumerFunc(void *param);
+static void *  syncIOConsumerFunc(void *param);
 static void    syncIOProcessRequest(void *pParent, SRpcMsg *pMsg, SEpSet *pEpSet);
 static void    syncIOProcessReply(void *pParent, SRpcMsg *pMsg, SEpSet *pEpSet);
 static int32_t syncIOAuth(void *parent, char *meterId, char *spi, char *encrypt, char *secret, char *ckey);
@@ -242,9 +242,9 @@ static int32_t syncIOStopInternal(SSyncIO *io) {
 }
 
 static void *syncIOConsumerFunc(void *param) {
-  SSyncIO   *io = param;
+  SSyncIO *  io = param;
   STaosQall *qall;
-  SRpcMsg   *pRpcMsg, rpcMsg;
+  SRpcMsg *  pRpcMsg, rpcMsg;
   qall = taosAllocateQall();
 
   while (1) {
diff --git a/source/libs/sync/src/syncMain.c b/source/libs/sync/src/syncMain.c
index ab696384a00c060d83b0ee3b5257460913d72e50..05e7bd34eb21f729fdb3d07cceabdb12f184ba3c 100644
--- a/source/libs/sync/src/syncMain.c
+++ b/source/libs/sync/src/syncMain.c
@@ -1272,6 +1272,18 @@ void syncNodeVoteForSelf(SSyncNode* pSyncNode) {
 }
 
 // snapshot --------------
+bool syncNodeHasSnapshot(SSyncNode* pSyncNode) {
+  bool      ret = false;
+  SSnapshot snapshot = {.data = NULL, .lastApplyIndex = -1, .lastApplyTerm = 0};
+  if (pSyncNode->pFsm->FpGetSnapshot != NULL) {
+    pSyncNode->pFsm->FpGetSnapshot(pSyncNode->pFsm, &snapshot);
+    if (snapshot.lastApplyIndex >= SYNC_INDEX_BEGIN) {
+      ret = true;
+    }
+  }
+  return ret;
+}
+
 bool syncNodeIsIndexInSnapshot(SSyncNode* pSyncNode, SyncIndex index) {
   SSnapshot snapshot;
   pSyncNode->pFsm->FpGetSnapshot(pSyncNode->pFsm, &snapshot);
@@ -1279,54 +1291,73 @@ bool syncNodeIsIndexInSnapshot(SSyncNode* pSyncNode, SyncIndex index) {
   return b;
 }
 
-// get last index and term along with snapshot
-int32_t syncNodeGetLastIndexTerm(SSyncNode* pSyncNode, SyncIndex* pLastIndex, SyncTerm* pLastTerm) {
-  SyncIndex logLastIndex = pSyncNode->pLogStore->getLastIndex(pSyncNode->pLogStore);
-  SSnapshot snapshot;
-  pSyncNode->pFsm->FpGetSnapshot(pSyncNode->pFsm, &snapshot);
-  SyncIndex snapshotLastIndex = snapshot.lastApplyIndex;
-
-  if (logLastIndex > snapshotLastIndex) {
-    *pLastIndex = logLastIndex;
-    *pLastTerm = pSyncNode->pLogStore->getLastTerm(pSyncNode->pLogStore);
-  } else if (logLastIndex == snapshotLastIndex) {
-    *pLastIndex = snapshotLastIndex;
-    *pLastTerm = snapshot.lastApplyTerm;
-  } else if (logLastIndex < snapshotLastIndex) {
-    // maybe wal is deleted
-    *pLastIndex = snapshotLastIndex;
-    *pLastTerm = snapshot.lastApplyTerm;
+SyncIndex syncNodeGetLastIndex(SSyncNode* pSyncNode) {
+  SSnapshot snapshot = {.data = NULL, .lastApplyIndex = -1, .lastApplyTerm = 0};
+  if (pSyncNode->pFsm->FpGetSnapshot != NULL) {
+    pSyncNode->pFsm->FpGetSnapshot(pSyncNode->pFsm, &snapshot);
+  }
+  SyncIndex logLastIndex = pSyncNode->pLogStore->syncLogLastIndex(pSyncNode->pLogStore);
+
+  SyncIndex lastIndex = logLastIndex > snapshot.lastApplyIndex ? logLastIndex : snapshot.lastApplyIndex;
+  return lastIndex;
+}
+
+SyncTerm syncNodeGetLastTerm(SSyncNode* pSyncNode) {
+  SSnapshot snapshot = {.data = NULL, .lastApplyIndex = -1, .lastApplyTerm = 0};
+  if (pSyncNode->pFsm->FpGetSnapshot != NULL) {
+    pSyncNode->pFsm->FpGetSnapshot(pSyncNode->pFsm, &snapshot);
+  }
+  SyncIndex logLastIndex = pSyncNode->pLogStore->syncLogLastIndex(pSyncNode->pLogStore);
+
+  SyncTerm lastTerm = 0;
+  if (logLastIndex >= snapshot.lastApplyIndex) {
+    lastTerm = pSyncNode->pLogStore->syncLogLastTerm(pSyncNode->pLogStore);
   } else {
-    ASSERT(0);
+    lastTerm = snapshot.lastApplyTerm;
   }
+  return lastTerm;
+}
+
+// get last index and term along with snapshot
+int32_t syncNodeGetLastIndexTerm(SSyncNode* pSyncNode, SyncIndex* pLastIndex, SyncTerm* pLastTerm) {
+  *pLastIndex = syncNodeGetLastIndex(pSyncNode);
+  *pLastTerm = syncNodeGetLastTerm(pSyncNode);
   return 0;
 }
 
-// get pre index and term of "index"
-int32_t syncNodeGetPreIndexTerm(SSyncNode* pSyncNode, SyncIndex index, SyncIndex* pPreIndex, SyncTerm* pPreTerm) {
+SyncIndex syncNodeGetPreIndex(SSyncNode* pSyncNode, SyncIndex index) {
   ASSERT(index >= SYNC_INDEX_BEGIN);
-  // ASSERT(!syncNodeIsIndexInSnapshot(pSyncNode, index));
-  int ret = 0;
-
   SyncIndex preIndex = index - 1;
-  if (syncNodeIsIndexInSnapshot(pSyncNode, preIndex)) {
-    SSnapshot snapshot;
+  return preIndex;
+}
+
+SyncTerm syncNodeGetPreITerm(SSyncNode* pSyncNode, SyncIndex index) {
+  SyncTerm  preTerm = 0;
+  SyncIndex preIndex = syncNodeGetPreIndex(pSyncNode, index);
+
+  SSnapshot snapshot = {.data = NULL, .lastApplyIndex = -1, .lastApplyTerm = 0};
+  if (pSyncNode->pFsm->FpGetSnapshot != NULL) {
     pSyncNode->pFsm->FpGetSnapshot(pSyncNode->pFsm, &snapshot);
-    ASSERT(preIndex == snapshot.lastApplyIndex);
+  }
 
-    *pPreIndex = snapshot.lastApplyIndex;
-    *pPreTerm = snapshot.lastApplyTerm;
+  if (syncNodeIsIndexInSnapshot(pSyncNode, preIndex) && preIndex == snapshot.lastApplyIndex) {
+    preTerm = snapshot.lastApplyTerm;
   } else {
-    SSyncRaftEntry* pPreEntry = pSyncNode->pLogStore->getEntry(pSyncNode->pLogStore, preIndex);
+    SSyncRaftEntry* pPreEntry = NULL;
+    int32_t         code = pSyncNode->pLogStore->syncLogGetEntry(pSyncNode->pLogStore, preIndex, &pPreEntry);
+    ASSERT(code == 0);
     if (pPreEntry != NULL) {
-      *pPreIndex = pPreEntry->index;
-      *pPreTerm = pPreEntry->term;
-    } else {
-      *pPreIndex = SYNC_INDEX_INVALID;
-      *pPreTerm = 0;
+      preTerm = pPreEntry->term;
+      taosMemoryFree(pPreEntry);
     }
   }
+  return preTerm;
+}
 
+// get pre index and term of "index"
+int32_t syncNodeGetPreIndexTerm(SSyncNode* pSyncNode, SyncIndex index, SyncIndex* pPreIndex, SyncTerm* pPreTerm) {
+  *pPreIndex = syncNodeGetPreIndex(pSyncNode, index);
+  *pPreTerm = syncNodeGetPreITerm(pSyncNode, index);
   return 0;
 }
 
diff --git a/source/libs/sync/src/syncRaftLog.c b/source/libs/sync/src/syncRaftLog.c
index 28b7a0bbf0242dd377d036ccdd9d15a1ad772f48..0178755651b0360b21b545e92fccc3281dcae65e 100644
--- a/source/libs/sync/src/syncRaftLog.c
+++ b/source/libs/sync/src/syncRaftLog.c
@@ -16,6 +16,22 @@
 #include "syncRaftLog.h"
 #include "wal.h"
 
+// refactor, log[0 .. n] ==> log[m .. n]
+static int32_t   raftLogSetBeginIndex(struct SSyncLogStore* pLogStore, SyncIndex beginIndex);
+static SyncIndex raftLogBeginIndex(struct SSyncLogStore* pLogStore);
+static SyncIndex raftLogEndIndex(struct SSyncLogStore* pLogStore);
+static bool      raftLogIsEmpty(struct SSyncLogStore* pLogStore);
+static int32_t   raftLogEntryCount(struct SSyncLogStore* pLogStore);
+static bool      raftLogInRange(struct SSyncLogStore* pLogStore, SyncIndex index);
+static SyncIndex raftLogLastIndex(struct SSyncLogStore* pLogStore);
+static SyncTerm  raftLogLastTerm(struct SSyncLogStore* pLogStore);
+static int32_t   raftLogAppendEntry(struct SSyncLogStore* pLogStore, SSyncRaftEntry* pEntry);
+static int32_t   raftLogGetEntry(struct SSyncLogStore* pLogStore, SyncIndex index, SSyncRaftEntry** ppEntry);
+static int32_t   raftLogTruncate(struct SSyncLogStore* pLogStore, SyncIndex fromIndex);
+
+static int32_t raftLogGetLastEntry(SSyncLogStore* pLogStore, SSyncRaftEntry** ppLastEntry);
+
+//-------------------------------
 static SSyncRaftEntry* logStoreGetLastEntry(SSyncLogStore* pLogStore);
 static SyncIndex       logStoreLastIndex(SSyncLogStore* pLogStore);
 static SyncTerm        logStoreLastTerm(SSyncLogStore* pLogStore);
@@ -25,6 +41,168 @@ static int32_t         logStoreTruncate(SSyncLogStore* pLogStore, SyncIndex from
 static int32_t         logStoreUpdateCommitIndex(SSyncLogStore* pLogStore, SyncIndex index);
 static SyncIndex       logStoreGetCommitIndex(SSyncLogStore* pLogStore);
 
+// refactor, log[0 .. n] ==> log[m .. n]
+static int32_t raftLogSetBeginIndex(struct SSyncLogStore* pLogStore, SyncIndex beginIndex) {
+  // if beginIndex == 0, donot need call this funciton
+  ASSERT(beginIndex > 0);
+
+  SSyncLogStoreData* pData = pLogStore->data;
+  SWal*              pWal = pData->pWal;
+  pData->beginIndex = beginIndex;
+  walRestoreFromSnapshot(pWal, beginIndex - 1);
+  return 0;
+}
+
+static SyncIndex raftLogBeginIndex(struct SSyncLogStore* pLogStore) {
+  SSyncLogStoreData* pData = pLogStore->data;
+  SWal*              pWal = pData->pWal;
+  return pData->beginIndex;
+}
+
+static SyncIndex raftLogEndIndex(struct SSyncLogStore* pLogStore) { return raftLogLastIndex(pLogStore); }
+
+static bool raftLogIsEmpty(struct SSyncLogStore* pLogStore) {
+  SyncIndex beginIndex = raftLogBeginIndex(pLogStore);
+  SyncIndex endIndex = raftLogEndIndex(pLogStore);
+  return (endIndex >= beginIndex);
+}
+
+static int32_t raftLogEntryCount(struct SSyncLogStore* pLogStore) {
+  SyncIndex beginIndex = raftLogBeginIndex(pLogStore);
+  SyncIndex endIndex = raftLogEndIndex(pLogStore);
+  int32_t   count = endIndex - beginIndex;
+  return count > 0 ? count : 0;
+}
+
+static bool raftLogInRange(struct SSyncLogStore* pLogStore, SyncIndex index) {
+  SyncIndex beginIndex = raftLogBeginIndex(pLogStore);
+  SyncIndex endIndex = raftLogEndIndex(pLogStore);
+  if (index >= beginIndex && index <= endIndex) {
+    return true;
+  } else {
+    return false;
+  }
+}
+
+static SyncIndex raftLogLastIndex(struct SSyncLogStore* pLogStore) {
+  SSyncLogStoreData* pData = pLogStore->data;
+  SWal*              pWal = pData->pWal;
+  SyncIndex          lastVer = walGetLastVer(pWal);
+  return lastVer;
+}
+
+static SyncTerm raftLogLastTerm(struct SSyncLogStore* pLogStore) {
+  SyncTerm lastTerm = 0;
+  if (raftLogEntryCount == 0) {
+    lastTerm = 0;
+  } else {
+    SSyncRaftEntry* pLastEntry;
+    int32_t         code = raftLogGetLastEntry(pLogStore, &pLastEntry);
+    ASSERT(code == 0);
+    lastTerm = pLastEntry->term;
+    taosMemoryFree(pLastEntry);
+  }
+  return lastTerm;
+}
+
+static int32_t raftLogAppendEntry(struct SSyncLogStore* pLogStore, SSyncRaftEntry* pEntry) {
+  SSyncLogStoreData* pData = pLogStore->data;
+  SWal*              pWal = pData->pWal;
+
+  SyncIndex lastIndex = raftLogLastIndex(pLogStore);
+  ASSERT(pEntry->index == lastIndex + 1);
+
+  int          code = 0;
+  SSyncLogMeta syncMeta;
+  syncMeta.isWeek = pEntry->isWeak;
+  syncMeta.seqNum = pEntry->seqNum;
+  syncMeta.term = pEntry->term;
+  code = walWriteWithSyncInfo(pWal, pEntry->index, pEntry->originalRpcType, syncMeta, pEntry->data, pEntry->dataLen);
+  if (code != 0) {
+    int32_t     err = terrno;
+    const char* errStr = tstrerror(err);
+    int32_t     linuxErr = errno;
+    const char* linuxErrMsg = strerror(errno);
+    sError("raftLogAppendEntry error, err:%d %X, msg:%s, linuxErr:%d, linuxErrMsg:%s", err, err, errStr, linuxErr,
+           linuxErrMsg);
+    ASSERT(0);
+  }
+
+  walFsync(pWal, true);
+  return code;
+}
+
+static int32_t raftLogGetEntry(struct SSyncLogStore* pLogStore, SyncIndex index, SSyncRaftEntry** ppEntry) {
+  SSyncLogStoreData* pData = pLogStore->data;
+  SWal*              pWal = pData->pWal;
+  int32_t            code;
+
+  *ppEntry = NULL;
+  if (raftLogInRange(pLogStore, index)) {
+    SWalReadHandle* pWalHandle = walOpenReadHandle(pWal);
+    ASSERT(pWalHandle != NULL);
+
+    code = walReadWithHandle(pWalHandle, index);
+    if (code != 0) {
+      int32_t     err = terrno;
+      const char* errStr = tstrerror(err);
+      int32_t     linuxErr = errno;
+      const char* linuxErrMsg = strerror(errno);
+      sError("raftLogGetEntry error, err:%d %X, msg:%s, linuxErr:%d, linuxErrMsg:%s", err, err, errStr, linuxErr,
+             linuxErrMsg);
+      walCloseReadHandle(pWalHandle);
+      ASSERT(0);
+      return code;
+    }
+
+    *ppEntry = syncEntryBuild(pWalHandle->pHead->head.bodyLen);
+    ASSERT(*ppEntry != NULL);
+    (*ppEntry)->msgType = TDMT_VND_SYNC_CLIENT_REQUEST;
+    (*ppEntry)->originalRpcType = pWalHandle->pHead->head.msgType;
+    (*ppEntry)->seqNum = pWalHandle->pHead->head.syncMeta.seqNum;
+    (*ppEntry)->isWeak = pWalHandle->pHead->head.syncMeta.isWeek;
+    (*ppEntry)->term = pWalHandle->pHead->head.syncMeta.term;
+    (*ppEntry)->index = index;
+    ASSERT((*ppEntry)->dataLen == pWalHandle->pHead->head.bodyLen);
+    memcpy((*ppEntry)->data, pWalHandle->pHead->head.body, pWalHandle->pHead->head.bodyLen);
+
+    // need to hold, do not new every time!!
+    walCloseReadHandle(pWalHandle);
+
+  } else {
+    // index not in range
+    code = -2;
+  }
+
+  return code;
+}
+
+static int32_t raftLogTruncate(struct SSyncLogStore* pLogStore, SyncIndex fromIndex) {
+  SSyncLogStoreData* pData = pLogStore->data;
+  SWal*              pWal = pData->pWal;
+  int32_t            code = walRollback(pWal, fromIndex);
+  if (code != 0) {
+    int32_t     err = terrno;
+    const char* errStr = tstrerror(err);
+    int32_t     linuxErr = errno;
+    const char* linuxErrMsg = strerror(errno);
+    sError("raftLogTruncate error, err:%d %X, msg:%s, linuxErr:%d, linuxErrMsg:%s", err, err, errStr, linuxErr,
+           linuxErrMsg);
+    ASSERT(0);
+  }
+  return code;
+}
+
+static int32_t raftLogGetLastEntry(SSyncLogStore* pLogStore, SSyncRaftEntry** ppLastEntry) {
+  if (raftLogEntryCount(pLogStore) == 0) {
+    return -1;
+  }
+  SyncIndex lastIndex = raftLogLastIndex(pLogStore);
+  int32_t   code = raftLogGetEntry(pLogStore, lastIndex, ppLastEntry);
+  return code;
+}
+
+//-------------------------------
 SSyncLogStore* logStoreCreate(SSyncNode* pSyncNode) {
   SSyncLogStore* pLogStore = taosMemoryMalloc(sizeof(SSyncLogStore));
   assert(pLogStore != NULL);
@@ -36,6 +214,16 @@ SSyncLogStore* logStoreCreate(SSyncNode* pSyncNode) {
   pData->pSyncNode = pSyncNode;
   pData->pWal = pSyncNode->pWal;
 
+  SyncIndex firstVer = walGetFirstVer(pData->pWal);
+  SyncIndex lastVer = walGetLastVer(pData->pWal);
+  if (firstVer >= 0) {
+    pData->beginIndex = firstVer;
+  } else if (firstVer == -1) {
+    pData->beginIndex = lastVer + 1;
+  } else {
+    ASSERT(0);
+  }
+
   pLogStore->appendEntry = logStoreAppendEntry;
   pLogStore->getEntry = logStoreGetEntry;
   pLogStore->truncate = logStoreTruncate;
@@ -43,6 +231,19 @@ SSyncLogStore* logStoreCreate(SSyncNode* pSyncNode) {
   pLogStore->getLastTerm = logStoreLastTerm;
   pLogStore->updateCommitIndex = logStoreUpdateCommitIndex;
   pLogStore->getCommitIndex = logStoreGetCommitIndex;
+
+  pLogStore->syncLogSetBeginIndex = raftLogSetBeginIndex;
+  pLogStore->syncLogBeginIndex = raftLogBeginIndex;
+  pLogStore->syncLogEndIndex = raftLogEndIndex;
+  pLogStore->syncLogIsEmpty = raftLogIsEmpty;
+  pLogStore->syncLogEntryCount = raftLogEntryCount;
+  pLogStore->syncLogInRange = raftLogInRange;
+  pLogStore->syncLogLastIndex = raftLogLastIndex;
+  pLogStore->syncLogLastTerm = raftLogLastTerm;
+  pLogStore->syncLogAppendEntry = raftLogAppendEntry;
+  pLogStore->syncLogGetEntry = raftLogGetEntry;
+  pLogStore->syncLogTruncate = raftLogTruncate;
+
   return pLogStore;
 }
 
@@ -53,6 +254,7 @@ void logStoreDestory(SSyncLogStore* pLogStore) {
   }
 }
 
+//-------------------------------
 int32_t logStoreAppendEntry(SSyncLogStore* pLogStore, SSyncRaftEntry* pEntry) {
   SSyncLogStoreData* pData = pLogStore->data;
   SWal*              pWal = pData->pWal;
@@ -136,7 +338,7 @@ int32_t logStoreTruncate(SSyncLogStore* pLogStore, SyncIndex fromIndex) {
            linuxErrMsg);
     ASSERT(0);
   }
-  return 0;  // to avoid compiler error
+  return 0;
 }
 
 SyncIndex logStoreLastIndex(SSyncLogStore* pLogStore) {
@@ -169,7 +371,7 @@ int32_t logStoreUpdateCommitIndex(SSyncLogStore* pLogStore, SyncIndex index) {
     sError("walCommit error, err:%d %X, msg:%s, linuxErr:%d, linuxErrMsg:%s", err, err, errStr, linuxErr, linuxErrMsg);
     ASSERT(0);
   }
-  return 0;  // to avoid compiler error
+  return 0;
 }
 
 SyncIndex logStoreGetCommitIndex(SSyncLogStore* pLogStore) {
@@ -204,9 +406,20 @@ cJSON* logStore2Json(SSyncLogStore* pLogStore) {
     snprintf(u64buf, sizeof(u64buf), "%lu", logStoreLastTerm(pLogStore));
     cJSON_AddStringToObject(pRoot, "LastTerm", u64buf);
 
+    snprintf(u64buf, sizeof(u64buf), "%ld", pData->beginIndex);
+    cJSON_AddStringToObject(pRoot, "beginIndex", u64buf);
+
     cJSON* pEntries = cJSON_CreateArray();
     cJSON_AddItemToObject(pRoot, "pEntries", pEntries);
     SyncIndex lastIndex = logStoreLastIndex(pLogStore);
+
+    for (SyncIndex i = pData->beginIndex; i <= lastIndex; ++i) {
+      SSyncRaftEntry* pEntry = logStoreGetEntry(pLogStore, i);
+      cJSON_AddItemToArray(pEntries, syncEntry2Json(pEntry));
+      syncEntryDestory(pEntry);
+    }
+
+    /*
     for (SyncIndex i = 0; i <= lastIndex; ++i) {
       SyncIndex walFirstVer = walGetFirstVer(pData->pWal);
 
@@ -216,6 +429,7 @@ cJSON* logStore2Json(SSyncLogStore* pLogStore) {
         syncEntryDestory(pEntry);
       }
     }
+    */
   }
 
   cJSON* pJson = cJSON_CreateObject();
@@ -244,6 +458,9 @@ cJSON* logStoreSimple2Json(SSyncLogStore* pLogStore) {
     cJSON_AddStringToObject(pRoot, "LastIndex", u64buf);
     snprintf(u64buf, sizeof(u64buf), "%lu", logStoreLastTerm(pLogStore));
     cJSON_AddStringToObject(pRoot, "LastTerm", u64buf);
+
+    snprintf(u64buf, sizeof(u64buf), "%ld", pData->beginIndex);
+    cJSON_AddStringToObject(pRoot, "beginIndex", u64buf);
   }
 
   cJSON* pJson = cJSON_CreateObject();
diff --git a/source/libs/sync/test/CMakeLists.txt b/source/libs/sync/test/CMakeLists.txt
index b6def04eaa04fdebcf514e60eb73dedc49f60856..c68c6349fbdbb4479b1e887991fabd6c2abf4198 100644
--- a/source/libs/sync/test/CMakeLists.txt
+++ b/source/libs/sync/test/CMakeLists.txt
@@ -44,6 +44,9 @@ add_executable(syncSnapshotRspTest "")
 add_executable(syncSnapshotSenderTest "")
 add_executable(syncSnapshotReceiverTest "")
 add_executable(syncTestTool "")
+add_executable(syncRaftLogTest "")
+add_executable(syncRaftLogTest2 "")
+add_executable(syncRaftLogTest3 "")
 
 
 target_sources(syncTest
@@ -230,6 +233,18 @@ target_sources(syncTestTool
     PRIVATE
     "syncTestTool.cpp"
 )
+target_sources(syncRaftLogTest
+    PRIVATE
+    "syncRaftLogTest.cpp"
+)
+target_sources(syncRaftLogTest2
+    PRIVATE
+    "syncRaftLogTest2.cpp"
+)
+target_sources(syncRaftLogTest3
+    PRIVATE
+    "syncRaftLogTest3.cpp"
+)
 
 
 target_include_directories(syncTest
@@ -462,6 +477,21 @@ target_include_directories(syncTestTool
     "${TD_SOURCE_DIR}/include/libs/sync"
     "${CMAKE_CURRENT_SOURCE_DIR}/../inc"
 )
+target_include_directories(syncRaftLogTest
+    PUBLIC
+    "${TD_SOURCE_DIR}/include/libs/sync"
+    "${CMAKE_CURRENT_SOURCE_DIR}/../inc"
+)
+target_include_directories(syncRaftLogTest2
+    PUBLIC
+    "${TD_SOURCE_DIR}/include/libs/sync"
+    "${CMAKE_CURRENT_SOURCE_DIR}/../inc"
+)
+target_include_directories(syncRaftLogTest3
+    PUBLIC
+    "${TD_SOURCE_DIR}/include/libs/sync"
+    "${CMAKE_CURRENT_SOURCE_DIR}/../inc"
+)
 
 
 target_link_libraries(syncTest
@@ -648,6 +678,18 @@ target_link_libraries(syncTestTool
     sync
     gtest_main
 )
+target_link_libraries(syncRaftLogTest
+    sync
+    gtest_main
+)
+target_link_libraries(syncRaftLogTest2
+    sync
+    gtest_main
+)
+target_link_libraries(syncRaftLogTest3
+    sync
+    gtest_main
+)
 
 
 enable_testing()
diff --git a/source/libs/sync/test/syncRaftLogTest.cpp b/source/libs/sync/test/syncRaftLogTest.cpp
new file mode 100644
index 0000000000000000000000000000000000000000..7903e86749c46e131a204f784dc330da369461e1
--- /dev/null
+++ b/source/libs/sync/test/syncRaftLogTest.cpp
@@ -0,0 +1,172 @@
+#include "syncRaftLog.h"
+//#include <gtest/gtest.h>
+#include <stdio.h>
+#include "syncEnv.h"
+#include "syncIO.h"
+#include "syncInt.h"
+#include "syncRaftStore.h"
+#include "syncUtil.h"
+#include "wal.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");
+}
+
+const char *gWalPath = "./syncLogStoreTest_wal";
+
+void init() { walInit(); }
+
+void test1() {
+  taosRemoveDir(gWalPath);
+
+  SWalCfg walCfg;
+  memset(&walCfg, 0, sizeof(SWalCfg));
+  walCfg.vgId = 1000;
+  walCfg.fsyncPeriod = 1000;
+  walCfg.retentionPeriod = 1000;
+  walCfg.rollPeriod = 1000;
+  walCfg.retentionSize = 1000;
+  walCfg.segSize = 1000;
+  walCfg.level = TAOS_WAL_FSYNC;
+  SWal *pWal = walOpen(gWalPath, &walCfg);
+  assert(pWal != NULL);
+
+  int64_t firstVer = walGetFirstVer(pWal);
+  int64_t lastVer = walGetLastVer(pWal);
+  printf("firstVer:%ld lastVer:%ld \n", firstVer, lastVer);
+
+  walClose(pWal);
+}
+
+void test2() {
+  taosRemoveDir(gWalPath);
+
+  SWalCfg walCfg;
+  memset(&walCfg, 0, sizeof(SWalCfg));
+  walCfg.vgId = 1000;
+  walCfg.fsyncPeriod = 1000;
+  walCfg.retentionPeriod = 1000;
+  walCfg.rollPeriod = 1000;
+  walCfg.retentionSize = 1000;
+  walCfg.segSize = 1000;
+  walCfg.level = TAOS_WAL_FSYNC;
+  SWal *pWal = walOpen(gWalPath, &walCfg);
+  assert(pWal != NULL);
+
+  for (int i = 0; i < 5; ++i) {
+    int code = walWrite(pWal, i, 100, "aa", 3);
+    if (code != 0) {
+      printf("code:%d terror:%d msg:%s i:%d \n", code, terrno, tstrerror(terrno), i);
+      assert(0);
+    }
+  }
+
+  int64_t firstVer = walGetFirstVer(pWal);
+  int64_t lastVer = walGetLastVer(pWal);
+  printf("firstVer:%ld lastVer:%ld \n", firstVer, lastVer);
+
+  walClose(pWal);
+}
+
+void test3() {
+  taosRemoveDir(gWalPath);
+
+  SWalCfg walCfg;
+  memset(&walCfg, 0, sizeof(SWalCfg));
+  walCfg.vgId = 1000;
+  walCfg.fsyncPeriod = 1000;
+  walCfg.retentionPeriod = 1000;
+  walCfg.rollPeriod = 1000;
+  walCfg.retentionSize = 1000;
+  walCfg.segSize = 1000;
+  walCfg.level = TAOS_WAL_FSYNC;
+  SWal *pWal = walOpen(gWalPath, &walCfg);
+  assert(pWal != NULL);
+
+  walRestoreFromSnapshot(pWal, 5);
+
+  int64_t firstVer = walGetFirstVer(pWal);
+  int64_t lastVer = walGetLastVer(pWal);
+  printf("firstVer:%ld lastVer:%ld \n", firstVer, lastVer);
+
+  walClose(pWal);
+}
+
+void test4() {
+  taosRemoveDir(gWalPath);
+
+  SWalCfg walCfg;
+  memset(&walCfg, 0, sizeof(SWalCfg));
+  walCfg.vgId = 1000;
+  walCfg.fsyncPeriod = 1000;
+  walCfg.retentionPeriod = 1000;
+  walCfg.rollPeriod = 1000;
+  walCfg.retentionSize = 1000;
+  walCfg.segSize = 1000;
+  walCfg.level = TAOS_WAL_FSYNC;
+  SWal *pWal = walOpen(gWalPath, &walCfg);
+  assert(pWal != NULL);
+
+  walRestoreFromSnapshot(pWal, 5);
+
+  for (int i = 6; i < 10; ++i) {
+    int code = walWrite(pWal, i, 100, "aa", 3);
+    if (code != 0) {
+      printf("code:%d terror:%d msg:%s i:%d \n", code, terrno, tstrerror(terrno), i);
+      assert(0);
+    }
+  }
+
+  int64_t firstVer = walGetFirstVer(pWal);
+  int64_t lastVer = walGetLastVer(pWal);
+  printf("firstVer:%ld lastVer:%ld \n", firstVer, lastVer);
+
+  walClose(pWal);
+}
+
+void test5() {
+  taosRemoveDir(gWalPath);
+
+  SWalCfg walCfg;
+  memset(&walCfg, 0, sizeof(SWalCfg));
+  walCfg.vgId = 1000;
+  walCfg.fsyncPeriod = 1000;
+  walCfg.retentionPeriod = 1000;
+  walCfg.rollPeriod = 1000;
+  walCfg.retentionSize = 1000;
+  walCfg.segSize = 1000;
+  walCfg.level = TAOS_WAL_FSYNC;
+  SWal *pWal = walOpen(gWalPath, &walCfg);
+  assert(pWal != NULL);
+
+  walRestoreFromSnapshot(pWal, 5);
+  walRestoreFromSnapshot(pWal, 7);
+
+  int64_t firstVer = walGetFirstVer(pWal);
+  int64_t lastVer = walGetLastVer(pWal);
+  printf("firstVer:%ld lastVer:%ld \n", firstVer, lastVer);
+
+  walClose(pWal);
+}
+
+void cleanup() { walCleanUp(); }
+
+int main(int argc, char **argv) {
+  tsAsyncLog = 0;
+  sDebugFlag = DEBUG_TRACE + DEBUG_SCREEN + DEBUG_FILE;
+  init();
+
+  test1();
+  test2();
+  test3();
+  test4();
+  test5();
+
+  cleanup();
+  return 0;
+}
diff --git a/source/libs/sync/test/syncRaftLogTest2.cpp b/source/libs/sync/test/syncRaftLogTest2.cpp
new file mode 100644
index 0000000000000000000000000000000000000000..27e1009335a82e42e0d8e8e1b00f8cfe709e9534
--- /dev/null
+++ b/source/libs/sync/test/syncRaftLogTest2.cpp
@@ -0,0 +1,98 @@
+#include <gtest/gtest.h>
+#include <stdio.h>
+#include "syncEnv.h"
+#include "syncIO.h"
+#include "syncInt.h"
+#include "syncRaftLog.h"
+#include "syncRaftStore.h"
+#include "syncUtil.h"
+#include "wal.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");
+}
+
+SSyncNode*     pSyncNode;
+SWal*          pWal;
+SSyncLogStore* pLogStore;
+const char*    pWalPath = "./syncLogStoreTest_wal";
+
+void init() {
+  walInit();
+  taosRemoveDir(pWalPath);
+
+  SWalCfg walCfg;
+  memset(&walCfg, 0, sizeof(SWalCfg));
+  walCfg.vgId = 1000;
+  walCfg.fsyncPeriod = 1000;
+  walCfg.retentionPeriod = 1000;
+  walCfg.rollPeriod = 1000;
+  walCfg.retentionSize = 1000;
+  walCfg.segSize = 1000;
+  walCfg.level = TAOS_WAL_FSYNC;
+  pWal = walOpen(pWalPath, &walCfg);
+  assert(pWal != NULL);
+
+  pSyncNode = (SSyncNode*)taosMemoryMalloc(sizeof(SSyncNode));
+  memset(pSyncNode, 0, sizeof(SSyncNode));
+  pSyncNode->pWal = pWal;
+}
+
+void cleanup() {
+  walClose(pWal);
+  walCleanUp();
+  taosMemoryFree(pSyncNode);
+}
+
+void logStoreTest() {
+  pLogStore = logStoreCreate(pSyncNode);
+  assert(pLogStore);
+  assert(pLogStore->getLastIndex(pLogStore) == SYNC_INDEX_INVALID);
+
+  logStoreLog2((char*)"logStoreTest", pLogStore);
+
+  for (int i = 0; i < 5; ++i) {
+    int32_t         dataLen = 10;
+    SSyncRaftEntry* pEntry = syncEntryBuild(dataLen);
+    assert(pEntry != NULL);
+    pEntry->msgType = 1;
+    pEntry->originalRpcType = 2;
+    pEntry->seqNum = 3;
+    pEntry->isWeak = true;
+    pEntry->term = 100 + i;
+    pEntry->index = pLogStore->getLastIndex(pLogStore) + 1;
+    snprintf(pEntry->data, dataLen, "value%d", i);
+
+    syncEntryLog2((char*)"==write entry== :", pEntry);
+    pLogStore->appendEntry(pLogStore, pEntry);
+    syncEntryDestory(pEntry);
+
+    if (i == 0) {
+      assert(pLogStore->getLastIndex(pLogStore) == SYNC_INDEX_BEGIN);
+    }
+  }
+  logStoreLog2((char*)"after appendEntry", pLogStore);
+
+  pLogStore->truncate(pLogStore, 3);
+  logStoreLog2((char*)"after truncate 3", pLogStore);
+
+  logStoreDestory(pLogStore);
+}
+
+int main(int argc, char** argv) {
+  tsAsyncLog = 0;
+  sDebugFlag = DEBUG_TRACE + DEBUG_SCREEN + DEBUG_FILE;
+
+  init();
+  logStoreTest();
+
+  taosMsleep(2000);
+  cleanup();
+
+  return 0;
+}
diff --git a/source/libs/sync/test/syncRaftLogTest3.cpp b/source/libs/sync/test/syncRaftLogTest3.cpp
new file mode 100644
index 0000000000000000000000000000000000000000..27e1009335a82e42e0d8e8e1b00f8cfe709e9534
--- /dev/null
+++ b/source/libs/sync/test/syncRaftLogTest3.cpp
@@ -0,0 +1,98 @@
+#include <gtest/gtest.h>
+#include <stdio.h>
+#include "syncEnv.h"
+#include "syncIO.h"
+#include "syncInt.h"
+#include "syncRaftLog.h"
+#include "syncRaftStore.h"
+#include "syncUtil.h"
+#include "wal.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");
+}
+
+SSyncNode*     pSyncNode;
+SWal*          pWal;
+SSyncLogStore* pLogStore;
+const char*    pWalPath = "./syncLogStoreTest_wal";
+
+void init() {
+  walInit();
+  taosRemoveDir(pWalPath);
+
+  SWalCfg walCfg;
+  memset(&walCfg, 0, sizeof(SWalCfg));
+  walCfg.vgId = 1000;
+  walCfg.fsyncPeriod = 1000;
+  walCfg.retentionPeriod = 1000;
+  walCfg.rollPeriod = 1000;
+  walCfg.retentionSize = 1000;
+  walCfg.segSize = 1000;
+  walCfg.level = TAOS_WAL_FSYNC;
+  pWal = walOpen(pWalPath, &walCfg);
+  assert(pWal != NULL);
+
+  pSyncNode = (SSyncNode*)taosMemoryMalloc(sizeof(SSyncNode));
+  memset(pSyncNode, 0, sizeof(SSyncNode));
+  pSyncNode->pWal = pWal;
+}
+
+void cleanup() {
+  walClose(pWal);
+  walCleanUp();
+  taosMemoryFree(pSyncNode);
+}
+
+void logStoreTest() {
+  pLogStore = logStoreCreate(pSyncNode);
+  assert(pLogStore);
+  assert(pLogStore->getLastIndex(pLogStore) == SYNC_INDEX_INVALID);
+
+  logStoreLog2((char*)"logStoreTest", pLogStore);
+
+  for (int i = 0; i < 5; ++i) {
+    int32_t         dataLen = 10;
+    SSyncRaftEntry* pEntry = syncEntryBuild(dataLen);
+    assert(pEntry != NULL);
+    pEntry->msgType = 1;
+    pEntry->originalRpcType = 2;
+    pEntry->seqNum = 3;
+    pEntry->isWeak = true;
+    pEntry->term = 100 + i;
+    pEntry->index = pLogStore->getLastIndex(pLogStore) + 1;
+    snprintf(pEntry->data, dataLen, "value%d", i);
+
+    syncEntryLog2((char*)"==write entry== :", pEntry);
+    pLogStore->appendEntry(pLogStore, pEntry);
+    syncEntryDestory(pEntry);
+
+    if (i == 0) {
+      assert(pLogStore->getLastIndex(pLogStore) == SYNC_INDEX_BEGIN);
+    }
+  }
+  logStoreLog2((char*)"after appendEntry", pLogStore);
+
+  pLogStore->truncate(pLogStore, 3);
+  logStoreLog2((char*)"after truncate 3", pLogStore);
+
+  logStoreDestory(pLogStore);
+}
+
+int main(int argc, char** argv) {
+  tsAsyncLog = 0;
+  sDebugFlag = DEBUG_TRACE + DEBUG_SCREEN + DEBUG_FILE;
+
+  init();
+  logStoreTest();
+
+  taosMsleep(2000);
+  cleanup();
+
+  return 0;
+}
diff --git a/source/libs/sync/test/syncTestTool.cpp b/source/libs/sync/test/syncTestTool.cpp
index b5efb95057a75bd4cd4d5284ccc55cbd7e1b48ac..2b69e41fcc540ccf9fbf1544ac4df086137b5697 100644
--- a/source/libs/sync/test/syncTestTool.cpp
+++ b/source/libs/sync/test/syncTestTool.cpp
@@ -184,7 +184,8 @@ SWal* createWal(char* path, int32_t vgId) {
   return pWal;
 }
 
-int64_t createSyncNode(int32_t replicaNum, int32_t myIndex, int32_t vgId, SWal* pWal, char* path, bool isStandBy, bool enableSnapshot) {
+int64_t createSyncNode(int32_t replicaNum, int32_t myIndex, int32_t vgId, SWal* pWal, char* path, bool isStandBy,
+                       bool enableSnapshot) {
   SSyncInfo syncInfo;
   syncInfo.vgId = vgId;
   syncInfo.msgcb = &gSyncIO->msgcb;