From 59ec251812b19674184643c55fa4d4cab7ba1d73 Mon Sep 17 00:00:00 2001
From: Ted Yu <yuzhihong@gmail.com>
Date: Sun, 31 May 2020 09:08:26 -0700
Subject: [PATCH] etcdserver: take read lock when cloning store

Signed-off-by: Ted Yu <yuzhihong@gmail.com>
---
 etcdserver/api/v2store/store.go | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/etcdserver/api/v2store/store.go b/etcdserver/api/v2store/store.go
index 9812ebd41ad..5a975cb958a 100644
--- a/etcdserver/api/v2store/store.go
+++ b/etcdserver/api/v2store/store.go
@@ -747,7 +747,7 @@ func (s *store) SaveNoCopy() ([]byte, error) {
 }
 
 func (s *store) Clone() Store {
-	s.worldLock.Lock()
+	s.worldLock.RLock()
 
 	clonedStore := newStore()
 	clonedStore.CurrentIndex = s.CurrentIndex
@@ -756,7 +756,7 @@ func (s *store) Clone() Store {
 	clonedStore.Stats = s.Stats.clone()
 	clonedStore.CurrentVersion = s.CurrentVersion
 
-	s.worldLock.Unlock()
+	s.worldLock.RUnlock()
 	return clonedStore
 }