Пример #1
0
func (self *DisableWriteCommand) Execute(c *cc.Controller) (cc.Result, error) {
	cs := c.ClusterState
	target := cs.FindNode(self.NodeId)
	if target == nil {
		return nil, ErrNodeNotExist
	}
	if target.Fail {
		return nil, ErrNodeIsDead
	}
	var err error
	for _, ns := range cs.AllNodeStates() {
		_, err = redis.DisableWrite(ns.Addr(), target.Id)
		if err == nil {
			return nil, nil
		}
	}
	return nil, err
}
Пример #2
0
func (cs *ClusterState) RunFailoverTask(oldMasterId, newMasterId string) {
	new := cs.FindNodeState(newMasterId)
	old := cs.FindNodeState(oldMasterId)

	if old == nil {
		log.Warningf(oldMasterId, "Can't run failover task, the old dead master lost")
		return
	}
	if new == nil {
		log.Warningf(oldMasterId, "Can't run failover task, new master lost (%s)", newMasterId)
		old.AdvanceFSM(cs, CMD_FAILOVER_END_SIGNAL)
		return
	}

	// 通过新主广播消息
	redis.DisableRead(new.Addr(), old.Id())
	redis.DisableWrite(new.Addr(), old.Id())

	c := make(chan error, 1)

	go func() {
		//choose failover force or takeover in case of arbiter
		cluster := cs.cluster
		rs := cluster.FindReplicaSetByNode(old.Id())
		if cluster.HasArbiter() || cluster.IsClusterDown() {
			//use failover takeover
			c <- redis.SetAsMasterWaitSyncDone(new.Addr(), true, true, rs)
		} else {
			//use failover force
			c <- redis.SetAsMasterWaitSyncDone(new.Addr(), true, false, rs)
		}
	}()

	select {
	case err := <-c:
		if err != nil {
			log.Eventf(old.Addr(), "Failover request done with error(%v).", err)
		} else {
			log.Eventf(old.Addr(), "Failover request done, new master %s(%s).", new.Id(), new.Addr())
		}
	case <-time.After(20 * time.Minute):
		log.Eventf(old.Addr(), "Failover timedout, new master %s(%s)", new.Id(), new.Addr())
	}

	// 重新读取一次,因为可能已经更新了
	roleChanged := false
	node := cs.FindNode(newMasterId)
	if node.IsMaster() {
		roleChanged = true
	} else {
		for i := 0; i < 10; i++ {
			info, err := redis.FetchInfo(node.Addr(), "Replication")
			if err == nil && info.Get("role") == "master" {
				roleChanged = true
				break
			}
			log.Warningf(old.Addr(),
				"Role of new master %s(%s) has not yet changed, will check 5 seconds later.",
				new.Id(), new.Addr())
			time.Sleep(5 * time.Second)
		}
	}

	if roleChanged {
		log.Eventf(old.Addr(), "New master %s(%s) role change success", node.Id, node.Addr())
		// 处理迁移过程中的异常问题,将故障节点(旧主)的slots转移到新主上
		oldNode := cs.FindNode(oldMasterId)
		if oldNode != nil && oldNode.Fail && oldNode.IsMaster() && len(oldNode.Ranges) != 0 {
			log.Warningf(old.Addr(),
				"Some node carries slots info(%v) about the old master, waiting for MigrateManager to fix it.",
				oldNode.Ranges)
		} else {
			log.Info(old.Addr(), "Good, no slot need to be fix after failover.")
		}
	} else {
		log.Warningf(old.Addr(), "Failover failed, please check cluster state.")
		log.Warningf(old.Addr(), "The dead master will goto OFFLINE state and then goto WAIT_FAILOVER_BEGIN state to try failover again.")
	}

	old.AdvanceFSM(cs, CMD_FAILOVER_END_SIGNAL)

	// 打开新主的写入,因为给slave加Write没有效果
	// 所以即便Failover失败,也不会产生错误
	redis.EnableWrite(new.Addr(), new.Id())
}
Пример #3
0
		} else {
			go cs.RunFailoverTask(ns.Id(), masterId)
		}
	}

	MasterGotoOfflineHandler = func(i interface{}) {
		ctx := i.(StateContext)
		cs := ctx.ClusterState
		ns := ctx.NodeState

		for _, n := range cs.AllNodeStates() {
			resp, err := redis.DisableRead(n.Addr(), ns.Id())
			if err == nil {
				log.Infof(ns.Addr(), "Disable read of the already dead master: %s %s", resp, ns.Id())
			}
			resp, err = redis.DisableWrite(n.Addr(), ns.Id())
			if err == nil {
				log.Infof(ns.Addr(), "Disable read of the already dead master: %s %s", resp, ns.Id())
				break
			}
		}
	}
)

var (
	RedisNodeStateModel = fsm.NewStateModel()
)

func init() {
	RedisNodeStateModel.AddState(RunningState)
	RedisNodeStateModel.AddState(WaitFailoverBeginState)