func (self *UpdateRegionCommand) Execute(c *cc.Controller) (cc.Result, error) {
if len(self.Nodes) == 0 {
return nil, nil
}
// 更新Cluster拓扑
cs := c.ClusterState
cs.UpdateRegionNodes(self.Region, self.Nodes)
// 首先更新迁移任务状态，以便发现故障时，在处理故障之前就暂停迁移任务
cluster := cs.GetClusterSnapshot()
if cluster != nil {
mm := c.MigrateManager
mm.HandleNodeStateChange(cluster)
}
for _, ns := range cs.AllNodeStates() {
node := ns.Node()
// Slave auto enable read ?
if !node.IsMaster() && !node.Fail && !node.Readable && node.MasterLinkStatus == "up" {
if meta.GetAppConfig().AutoEnableSlaveRead {
redis.EnableRead(node.Addr(), node.Id)
}
}
// Master auto enable write ?
if node.IsMaster() && !node.Fail && !node.Writable {
if meta.GetAppConfig().AutoEnableMasterWrite {
redis.EnableWrite(node.Addr(), node.Id)
}
}
// Fix chained replication: slave's parent is slave.
if meta.LocalRegion() == self.Region && !node.IsMaster() {
parent := cs.FindNode(node.ParentId)
// Parent is not master?
if parent != nil && !parent.IsMaster() {
grandpa := cs.FindNode(parent.ParentId)
if grandpa != nil {
_, err := redis.ClusterReplicate(node.Addr(), grandpa.Id)
if err == nil {
log.Warningf(node.Addr(), "Fix chained replication, (%s->%s->%s)=>(%s->%s)",
node, parent, grandpa, node, grandpa)
}
} else {
log.Warningf(node.Addr(), "Found chained replication, (%s->%s->nil), cannot fix.",
node, parent)
}
}
}
// 更新Region内Node的状态机
ns.AdvanceFSM(cs, state.CMD_NONE)
}
return nil, nil
}
func (self *EnableReadCommand) 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.EnableRead(ns.Addr(), target.Id)
if err == nil {
return nil, nil
}
}
return nil, err
}