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[站长] 请教一个关于双机房的问题

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场景是公司有两个机房，主机房和备用机房，两个机房的数据库做了主从同步，现在有个问题，就是当主机房断电后，我们会通过域名来切换到备用机房，但是当有电之后还是要切回主机房，当切回主机房之后，在备用机房产生的额外的数据怎么同步给主机房。还有就是主从同步也会因为备用机房多出来的数据而断掉，这也是个问题。除了用 dump 数据重新同步，还有什么比较好的方法吗

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