diff --git a/source/libs/sync/src/syncRaftLog.c b/source/libs/sync/src/syncRaftLog.c
index 2b1cee51d70840466ae60779f407b5aaf53df07c..db0b6d1d02550e5b2ec2319617c490acf45ebb46 100644
--- a/source/libs/sync/src/syncRaftLog.c
+++ b/source/libs/sync/src/syncRaftLog.c
@@ -38,7 +38,7 @@ SSyncLogStore* logStoreCreate(SSyncNode* pSyncNode) {
   }
 
   // pLogStore->pCache = taosLRUCacheInit(10 * 1024 * 1024, 1, .5);
-  pLogStore->pCache = taosLRUCacheInit(100 * 1024 * 1024, 1, .5);
+  pLogStore->pCache = taosLRUCacheInit(30 * 1024 * 1024, 1, .5);
   if (pLogStore->pCache == NULL) {
     taosMemoryFree(pLogStore);
     terrno = TSDB_CODE_WAL_OUT_OF_MEMORY;