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server: set timeout for MoveLeader #1537

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server: set timeout for MoveLeader #1537

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3ed71f0
server: set timeout for MoveLeader
disksing May 16, 2019
93f3361
fix compile
disksing May 16, 2019
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16 changes: 13 additions & 3 deletions server/leader.go
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Original file line number Diff line number Diff line change
Expand Up @@ -35,7 +35,10 @@ var (
nextLeaderTTL = 10 // in seconds
)

// IsLeader returns whether server is leader or not.
// The timeout to wait transfer etcd leader to complete.
const moveLeaderTimeout = 5 * time.Second

// IsLeader returns whether the server is leader or not.
func (s *Server) IsLeader() bool {
return atomic.LoadInt64(&s.isLeader) == 1
}
Expand Down Expand Up @@ -135,7 +138,7 @@ func (s *Server) etcdLeaderLoop() {
break
}
if myPriority > leaderPriority {
err := s.etcd.Server.MoveLeader(ctx, etcdLeader, s.ID())
err := s.MoveEtcdLeader(ctx, etcdLeader, s.ID())
if err != nil {
log.Errorf("failed to transfer etcd leader: %v", err)
} else {
Expand All @@ -152,6 +155,13 @@ func getLeaderAddr(leader *pdpb.Member) string {
return strings.Join(leader.GetClientUrls(), ",")
}

// MoveEtcdLeader tries to transfer etcd leader.
func (s *Server) MoveEtcdLeader(ctx context.Context, old, new uint64) error {
moveCtx, cancel := context.WithTimeout(ctx, moveLeaderTimeout)
defer cancel()
return errors.Trace(s.etcd.Server.MoveLeader(moveCtx, old, new))
}

// getLeader gets server leader from etcd.
func getLeader(c *clientv3.Client, leaderPath string) (*pdpb.Member, error) {
leader := &pdpb.Member{}
Expand Down Expand Up @@ -344,7 +354,7 @@ func (s *Server) ResignLeader(nextLeader string) error {
}
nextLeaderID := leaderIDs[rand.Intn(len(leaderIDs))]
log.Infof("%s ready to resign leader, next leader: %v", s.Name(), nextLeaderID)
err = s.etcd.Server.MoveLeader(s.leaderLoopCtx, s.ID(), nextLeaderID)
err = s.MoveEtcdLeader(s.leaderLoopCtx, s.ID(), nextLeaderID)
return errors.Trace(err)
}

Expand Down