diff --git a/src/resource_pool.go b/src/resource_pool.go
index 4daa98e..910faa0 100644
--- a/src/resource_pool.go
+++ b/src/resource_pool.go
@@ -362,6 +362,7 @@ func (pool *ResourcePool) scaleSeg(seg *PoolSeg) {
 	for _, id := range segIDs {
 		pool.pools[id].Lock.Lock()
 	}
+	log.Println(segIDs)
 
 	/* update Next */
 	for cur := pre; cur.ID != candidate.ID; {