diff --git a/source/libs/sync/inc/syncInt.h b/source/libs/sync/inc/syncInt.h
index 64552fb10a..bd007b4799 100644
--- a/source/libs/sync/inc/syncInt.h
+++ b/source/libs/sync/inc/syncInt.h
@@ -219,6 +219,11 @@ void syncNodeCandidate2Follower(SSyncNode* pSyncNode);
 void syncNodeVoteForTerm(SSyncNode* pSyncNode, SyncTerm term, SRaftId* pRaftId);
 void syncNodeVoteForSelf(SSyncNode* pSyncNode);
 
+// snapshot --------------
+bool    syncNodeIsInSnapshot(SSyncNode* pSyncNode, SyncIndex index);
+int32_t syncNodeGetLastIndexTerm(SSyncNode* pSyncNode, SyncIndex* pLastIndex, SyncTerm* pLastTerm);
+int32_t syncNodeGetPreIndexTerm(SSyncNode* pSyncNode, SyncIndex index, SyncIndex* pPreIndex, SyncTerm* pPreTerm);
+
 // for debug --------------
 void syncNodePrint(SSyncNode* pObj);
 void syncNodePrint2(char* s, SSyncNode* pObj);
diff --git a/source/libs/sync/src/syncMain.c b/source/libs/sync/src/syncMain.c
index 8f415019ab..dca9e64b3d 100644
--- a/source/libs/sync/src/syncMain.c
+++ b/source/libs/sync/src/syncMain.c
@@ -1200,6 +1200,15 @@ void syncNodeVoteForSelf(SSyncNode* pSyncNode) {
   syncRequestVoteReplyDestroy(pMsg);
 }
 
+// snapshot --------------
+bool syncNodeIsInSnapshot(SSyncNode* pSyncNode, SyncIndex index) { return true; }
+
+int32_t syncNodeGetLastIndexTerm(SSyncNode* pSyncNode, SyncIndex* pLastIndex, SyncTerm* pLastTerm) { return 0; }
+
+int32_t syncNodeGetPreIndexTerm(SSyncNode* pSyncNode, SyncIndex index, SyncIndex* pPreIndex, SyncTerm* pPreTerm) {
+  return 0;
+}
+
 // for debug --------------
 void syncNodePrint(SSyncNode* pObj) {
   char* serialized = syncNode2Str(pObj);