From dad1161c7002d074ef87e4b9279881e4e4a6e426 Mon Sep 17 00:00:00 2001
From: "cheng.li01" <cheng.li01@aispeech.com>
Date: Wed, 8 Jul 2020 19:57:19 +0800
Subject: [PATCH] fix dn.volumes Iterate when write issue

---
 weed/topology/data_node.go | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/weed/topology/data_node.go b/weed/topology/data_node.go
index d18dd6af0..efdf5285b 100644
--- a/weed/topology/data_node.go
+++ b/weed/topology/data_node.go
@@ -199,6 +199,8 @@ func (dn *DataNode) ToDataNodeInfo() *master_pb.DataNodeInfo {
 
 // GetVolumeIds returns the human readable volume ids limited to count of max 100.
 func (dn *DataNode) GetVolumeIds() string {
+	dn.RLock()
+	defer dn.RUnlock()
 	ids := make([]int, 0, len(dn.volumes))
 
 	for k := range dn.volumes {