diff --git a/src/balance/src/balance.c b/src/balance/src/balance.c
index db5dd6a520bec182c132da8132140b7cc9b08b39..53ed860aa16e7733e656c965feb75f88d0d26311 100644
--- a/src/balance/src/balance.c
+++ b/src/balance/src/balance.c
@@ -415,7 +415,11 @@ static int32_t balanceMonitorVgroups() {
     } else if (vgReplica < dbReplica) {
       mInfo("vgId:%d, replica:%d numOfVnodes:%d, try add one vnode", pVgroup->vgId, dbReplica, vgReplica);
       hasUpdatingVgroup = true;
-      balanceAddVnode(pVgroup, NULL, NULL);
+      int32_t code = balanceAddVnode(pVgroup, NULL, NULL);
+      if (code == TSDB_CODE_SUCCESS) {
+        mnodeDecVgroupRef(pVgroup);
+        break;
+      }
     }
 
     mnodeDecVgroupRef(pVgroup);
diff --git a/src/inc/taosdef.h b/src/inc/taosdef.h
index c3a808b7659b5be4f6de381359b731f5e816cfb0..9faf903c3a355de2875d55b00fca835e5ece2bbd 100644
--- a/src/inc/taosdef.h
+++ b/src/inc/taosdef.h
@@ -303,7 +303,7 @@ void tsDataSwap(void *pLeft, void *pRight, int32_t type, int32_t size);
 
 #define TSDB_MIN_DAYS_PER_FILE          1
 #define TSDB_MAX_DAYS_PER_FILE          3650 
-#define TSDB_DEFAULT_DAYS_PER_FILE      10 
+#define TSDB_DEFAULT_DAYS_PER_FILE      5 
 
 #define TSDB_MIN_KEEP                   1        // data in db to be reserved.
 #define TSDB_MAX_KEEP                   365000   // data in db to be reserved.
diff --git a/src/sync/src/syncMain.c b/src/sync/src/syncMain.c
index 2cc026484b9c107a7031a5e3d57215b1a02702b1..7c4b57350af0e66ce1a0bf7c63987a2b6db274bb 100644
--- a/src/sync/src/syncMain.c
+++ b/src/sync/src/syncMain.c
@@ -30,7 +30,7 @@
 #include "syncInt.h"
 
 // global configurable
-int       tsMaxSyncNum = 4;
+int       tsMaxSyncNum = 2;
 int       tsSyncTcpThreads = 2;
 int       tsMaxWatchFiles = 100;
 int       tsMaxFwdInfo = 200;