redis cluster cluster architecture Comments (xxi) -slave automatic migration - high availability architecture

. 5.13 redis cluster experiment: slave automatically migrate - high availability architecture

5.13.1 slave principle of automatic migration

slave principle of automatic migration

There are currently eight such master, each having a slave, then added three slave as redundant, and some have two slave master, appeared salve redundancy. If a only a master of the slave hung up, redis cluster will automatically migrate a redundant slave to the master, based on this principle, achieve greater availability architecture, just adding some redundant slave can be achieved .

5.13.2.slave automatic migration scenarios

slave automatic migration scenarios

如果每个master只有一个slave，当slave死了，对应的master也死了，可用性就降低了。但是如果给整个集群挂载了一些冗余slave，那么某个master的slave死了，冗余的slave会被自动迁移作为master的新slave，此时即使那个master也死了，还是有一个slave会切换成master。

Check the cluster:

There are two slave master in 7003: 7006,7008, 7003 we will kill to see if there are slave automatically switches to master.