From f947c815d03af6c42a5fc2bd0de42ade51d3820e Mon Sep 17 00:00:00 2001
From: Jay Lee <BusyJayLee@gmail.com>
Date: Thu, 21 Jan 2021 16:09:37 +0800
Subject: [PATCH] raft: check `VotersOutgoing` for snapshot

Close #12631.

Signed-off-by: Jay Lee <BusyJayLee@gmail.com>
---
 raft/raft.go | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/raft/raft.go b/raft/raft.go
index e048534a4..71a3e958d 100644
--- a/raft/raft.go
+++ b/raft/raft.go
@@ -1412,6 +1412,9 @@ func (r *raft) restore(s pb.Snapshot) bool {
 	for _, set := range [][]uint64{
 		cs.Voters,
 		cs.Learners,
+		cs.VotersOutgoing,
+		// `LearnersNext` doesn't need to be checked. According to the rules, if a peer in
+		// `LearnersNext`, it has to be in `VotersOutgoing`.
 	} {
 		for _, id := range set {
 			if id == r.id {