etcdmain: only get initial cluster setting if the member is not initi…

…alized

etcdmain/etcd.go

@@ -194,9 +194,17 @@ func startEtcdOrProxyV2() {
 
 // startEtcd launches the etcd server and HTTP handlers for client/server communication.
 func startEtcd(cfg *config) (<-chan struct{}, error) {
-	urlsmap, token, err := getPeerURLsMapAndToken(cfg, "etcd")
-	if err != nil {
-		return nil, fmt.Errorf("error setting up initial cluster: %v", err)
+	var (
+		urlsmap types.URLsMap
+		token   string
+		err     error
+	)
+
+	if !IsMemberInitialized(cfg) {
+		urlsmap, token, err = getPeerURLsMapAndToken(cfg, "etcd")
+		if err != nil {
+			return nil, fmt.Errorf("error setting up initial cluster: %v", err)
+		}
 	}
 
 	if cfg.PeerAutoTLS && cfg.peerTLSInfo.Empty() {

etcdmain/util.go

@@ -0,0 +1,30 @@
+// Copyright 2016 The etcd Authors
+//
+// Licensed 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 etcdmain
+
+import (
+	"path"
+
+	"github.com/coreos/etcd/wal"
+)
+
+func IsMemberInitialized(cfg *config) bool {
+	waldir := cfg.WalDir
+	if waldir == "" {
+		waldir = path.Join(cfg.Dir, "member", "wal")
+	}
+
+	return wal.Exist(waldir)
+}