diff --git a/source/libs/sync/src/syncAppendEntriesReply.c b/source/libs/sync/src/syncAppendEntriesReply.c
index f246e4fb2918dc596123f5f4f959c0b000b797cd..f5bcda195517c97970febdc34a769d49b363128c 100644
--- a/source/libs/sync/src/syncAppendEntriesReply.c
+++ b/source/libs/sync/src/syncAppendEntriesReply.c
@@ -112,7 +112,13 @@ int32_t syncNodeOnAppendEntriesReplySnapshotCb(SSyncNode* ths, SyncAppendEntries
   }
 
   syncIndexMgrLog2("recv SyncAppendEntriesReply, before pNextIndex:", ths->pNextIndex);
-  syncIndexMgrLog2("recv SyncAppendEntriesReply before pMatchIndex:", ths->pMatchIndex);
+  syncIndexMgrLog2("recv SyncAppendEntriesReply, before pMatchIndex:", ths->pMatchIndex);
+  {
+    SSnapshot snapshot;
+    ths->pFsm->FpGetSnapshot(ths->pFsm, &snapshot);
+    sTrace("recv SyncAppendEntriesReply, before snapshot.lastApplyIndex:%ld, snapshot.lastApplyTerm:%lu",
+           snapshot.lastApplyIndex, snapshot.lastApplyTerm);
+  }
 
   // no need this code, because if I receive reply.term, then I must have sent for that term.
   //  if (pMsg->term > ths->pRaftStore->currentTerm) {
@@ -133,6 +139,7 @@ int32_t syncNodeOnAppendEntriesReplySnapshotCb(SSyncNode* ths, SyncAppendEntries
   if (pMsg->success) {
     // nextIndex'  = [nextIndex  EXCEPT ![i][j] = m.mmatchIndex + 1]
     syncIndexMgrSetIndex(ths->pNextIndex, &(pMsg->srcId), pMsg->matchIndex + 1);
+    sTrace("update next index:%ld, success:%d", pMsg->matchIndex + 1, pMsg->success);
 
     // matchIndex' = [matchIndex EXCEPT ![i][j] = m.mmatchIndex]
     syncIndexMgrSetIndex(ths->pMatchIndex, &(pMsg->srcId), pMsg->matchIndex);
@@ -144,6 +151,7 @@ int32_t syncNodeOnAppendEntriesReplySnapshotCb(SSyncNode* ths, SyncAppendEntries
 
   } else {
     SyncIndex nextIndex = syncIndexMgrGetIndex(ths->pNextIndex, &(pMsg->srcId));
+    sTrace("begin to update next index:%ld, success:%d", nextIndex, pMsg->success);
 
     // notice! int64, uint64
     if (nextIndex > SYNC_INDEX_BEGIN) {
@@ -180,11 +188,19 @@ int32_t syncNodeOnAppendEntriesReplySnapshotCb(SSyncNode* ths, SyncAppendEntries
     } else {
       nextIndex = SYNC_INDEX_BEGIN;
     }
+
     syncIndexMgrSetIndex(ths->pNextIndex, &(pMsg->srcId), nextIndex);
+    sTrace("update next index:%ld, success:%d", nextIndex, pMsg->success);
   }
 
   syncIndexMgrLog2("recv SyncAppendEntriesReply, after pNextIndex:", ths->pNextIndex);
   syncIndexMgrLog2("recv SyncAppendEntriesReply, after pMatchIndex:", ths->pMatchIndex);
+  {
+    SSnapshot snapshot;
+    ths->pFsm->FpGetSnapshot(ths->pFsm, &snapshot);
+    sTrace("recv SyncAppendEntriesReply, after snapshot.lastApplyIndex:%ld, snapshot.lastApplyTerm:%lu",
+           snapshot.lastApplyIndex, snapshot.lastApplyTerm);
+  }
 
   return ret;
 }
\ No newline at end of file
diff --git a/source/libs/sync/src/syncReplication.c b/source/libs/sync/src/syncReplication.c
index d26ed6bcb407b238dd61630113332e871a6dc87f..ab3614bac3fa0759010e02333076c3e3ab17d792 100644
--- a/source/libs/sync/src/syncReplication.c
+++ b/source/libs/sync/src/syncReplication.c
@@ -122,6 +122,12 @@ int32_t syncNodeAppendEntriesPeersSnapshot(SSyncNode* pSyncNode) {
   syncIndexMgrLog2("begin append entries peers pNextIndex:", pSyncNode->pNextIndex);
   syncIndexMgrLog2("begin append entries peers pMatchIndex:", pSyncNode->pMatchIndex);
   logStoreSimpleLog2("begin append entries peers LogStore:", pSyncNode->pLogStore);
+  {
+    SSnapshot snapshot;
+    pSyncNode->pFsm->FpGetSnapshot(pSyncNode->pFsm, &snapshot);
+    sTrace("begin append entries peers, snapshot.lastApplyIndex:%ld, snapshot.lastApplyTerm:%lu",
+           snapshot.lastApplyIndex, snapshot.lastApplyTerm);
+  }
 
   int32_t ret = 0;
   for (int i = 0; i < pSyncNode->peersNum; ++i) {