diff --git a/internal/indexcoord/meta_table.go b/internal/indexcoord/meta_table.go
index 6aaebd39f0..d1b20dfe63 100644
--- a/internal/indexcoord/meta_table.go
+++ b/internal/indexcoord/meta_table.go
@@ -402,6 +402,7 @@ func (mt *metaTable) GetUnassignedTasks(onlineNodeIDs []int64) []Meta {
 	mt.lock.RLock()
 	defer mt.lock.RUnlock()
 
+	log.Debug("IndexCoord get unassigned tasks", zap.Int64s("online nodes", onlineNodeIDs))
 	var metas []Meta
 
 	for _, meta := range mt.indexBuildID2Meta {
@@ -425,6 +426,8 @@ func (mt *metaTable) GetUnassignedTasks(onlineNodeIDs []int64) []Meta {
 		}
 	}
 
+	log.Debug("IndexCoord get unassigned tasks finished", zap.Int("tasks num", len(metas)))
+
 	return metas
 }