大部分MySQL集群都会进行了多机房部署，如其中一个机房提供读写，其它机房提供读。如下是介绍具体的实现：  如上图是各实例分配，所属组分为4组，0号组为写组，即主库所在的组。1号组提供其它机房读，2号组提供为阿里云机房读，3号组提供为aws机房读。这里是将主库都加入了1，2，3号组中，是为了每个组保持高可用，这里显示是主库，所以将权重改为50，表示大部分读请求都在各组的从上。即使是从挂了也不影响读。当然，如果机房有多台从，那也可以不配置主库来提供读。 路由规则：  主要实现是，先进行客户端来源ip限制，然后进行读写分离。在读后，再进行按机房分组。分组必须要有实例，否则会导致请求阻塞超时。

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