复制是一个异步的过程，不能保证故障转移期间两个副本之间所有数据都是一致的。
Replication is an asynchronous process and can not guarantee during a failover that all data is consistent between copies.
复制是一个异步的过程，不能保证故障转移期间两个副本之间所有数据都是一致的。
Replication is an asynchronous process and can not guarantee during a failover that all data is consistent between copies.
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