From 17683d074cc3f802fcc3842748131473ce89a20e Mon Sep 17 00:00:00 2001
From: johncming <johncming@yahoo.com>
Date: Wed, 22 Jan 2020 17:57:37 +0800
Subject: [PATCH] discovery: fix bug that use rlock for read. (#5928)

Signed-off-by: johncming <johncming@yahoo.com>
---
 discovery/manager.go | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/discovery/manager.go b/discovery/manager.go
index 5457bd9b2e..d135cd54e7 100644
--- a/discovery/manager.go
+++ b/discovery/manager.go
@@ -304,8 +304,8 @@ func (m *Manager) updateGroup(poolKey poolKey, tgs []*targetgroup.Group) {
 }
 
 func (m *Manager) allGroups() map[string][]*targetgroup.Group {
-	m.mtx.Lock()
-	defer m.mtx.Unlock()
+	m.mtx.RLock()
+	defer m.mtx.RUnlock()
 
 	tSets := map[string][]*targetgroup.Group{}
 	for pkey, tsets := range m.targets {