Method crash1

src/raft/config.go:105–134

shut down a Raft server but save its persistent state.

(i int)

// shut down a Raft server but save its persistent state.
func (cfg *config) crash1(i int) {
	cfg.disconnect(i)
	cfg.net.DeleteServer(i) // disable client connections to the server.

	cfg.mu.Lock()
	defer cfg.mu.Unlock()

	// a fresh persister, in case old instance
	// continues to update the Persister.
	// but copy old persister's content so that we always
	// pass Make() the last persisted state.
	if cfg.saved[i] != nil {
		cfg.saved[i] = cfg.saved[i].Copy()
	}

	rf := cfg.rafts[i]
	if rf != nil {
		cfg.mu.Unlock()
		rf.Kill()
		cfg.mu.Lock()
		cfg.rafts[i] = nil
	}

	if cfg.saved[i] != nil {
		raftlog := cfg.saved[i].ReadRaftState()
		snapshot := cfg.saved[i].ReadSnapshot()
		cfg.saved[i] = &Persister{}
		cfg.saved[i].SaveStateAndSnapshot(raftlog, snapshot)
	}
}

func (cfg *config) checkLogs(i int, m ApplyMsg) (string, bool) {
	err_msg := ""