diff --git a/tools/component/component.go b/tools/component/component.go
index 285f2ecae..4e44bb7ba 100644
--- a/tools/component/component.go
+++ b/tools/component/component.go
@@ -157,12 +157,12 @@ func checkMysql() error {
 
 func checkMongo() error {
 	var client *mongo.Client
+	uri := "mongodb://sample.host:27017/?maxPoolSize=20&w=majority"
 	defer func() {
 		if client != nil {
 			client.Disconnect(context.TODO())
 		}
 	}()
-	uri := "mongodb://sample.host:27017/?maxPoolSize=20&w=majority"
 	if config.Config.Mongo.Uri != "" {
 		uri = config.Config.Mongo.Uri
 	} else {
@@ -188,7 +188,6 @@ func checkMongo() error {
 	if err != nil {
 		return errs.Wrap(err)
 	} else {
-		//err = client.Ping(context.TODO(), &readpref.ReadPref{})
 		err = client.Ping(context.TODO(), nil)
 		if err != nil {
 			return errs.Wrap(err)