tianxiaoliang commented on a change in pull request #722:
URL: 
https://github.com/apache/servicecomb-service-center/pull/722#discussion_r512482889



##########
File path: datasource/etcd/client/manager.go
##########
@@ -0,0 +1,81 @@
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one or more
+ * contributor license agreements.  See the NOTICE file distributed with
+ * this work for additional information regarding copyright ownership.
+ * The ASF licenses this file to You under the Apache License, Version 2.0
+ * (the "License"); you may not use this file except in compliance with
+ * the License.  You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package client
+
+import (
+       "fmt"
+       "github.com/apache/servicecomb-service-center/pkg/backoff"
+       "github.com/apache/servicecomb-service-center/pkg/log"
+       "time"
+)
+
+type newClientFunc func(opts Options) Registry
+
+var (
+       plugins    = make(map[ImplName]newClientFunc)
+       pluginInst Registry
+)
+
+// load plugins configuration into plugins
+func Install(pluginImplName string, newFunc newClientFunc) {
+       plugins[ImplName(pluginImplName)] = newFunc
+}
+
+// construct storage plugin instance
+// invoked by sc main process
+func Init(opts Options) error {
+       for i := 0; ; i++ {

Review comment:
       无限循环不用声明这个i




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