刚刚接到报警短信，从库宕机，马上通知机房重启，在检查MySQL时，发现同步挂了，报主键冲突，询问开发是不是有往里面写数据，回答没有。这就奇怪了，怎么会无缘
刚刚接到报警短信，从库宕机，马上通知机房重启，在检查MySQL时，发现同步挂了，报主键冲突，询问开发是不是有往里面写数据，回答没有。
这就奇怪了，怎么会无缘无故报错呢？在检查了my.cnf配置文件，发现有个参数没有配置：
innodb_overwrite_relay_log_info = 1当从库宕机后，重新开启主从复制同步，它可以重新执行已提交事务，这样就会造成同步失败，而这个参数就会避免这个问题的出现。
当开启了这个参数后
.... + InnoDB: Warning: innodb_overwrite_relay_log_info is enabled. Updates of other storage engines may have problem of consistency. + InnoDB: relay-log.info is detected. + InnoDB: relay log: position 429, file name ./gauntlet3-relay-bin.000111 + InnoDB: master log: position 280, file name gauntlet3-bin.000015 .... InnoDB: Starting crash recovery. .... InnoDB: Apply batch completed + InnoDB: In a MySQL replication slave the last master binlog file + InnoDB: position 0 468, file name gauntlet3-bin.000015 + InnoDB: and relay log file + InnoDB: position 0 617, file name ./gauntlet3-relay-bin.000111 090205 17:41:31 InnoDB Plugin 1.0.2-3 started; log sequence number 57933 + InnoDB: relay-log.info have been overwritten. .... 090205 17:41:31 [Note] Slave SQL thread initialized, starting replication in log ``gauntlet3-bin.000015`` at position 468, relay log ``./gauntlet3-relay-bin.000111`` position: 617已经执行完的Position点：
master log: position 280, file name gauntlet3-bin.000015在恢复时它内部会检测到280这个点已经执行完毕，从下一个点468开始同步，并且重写relay.info文件，，确保了主从同步正确。
建议在从库上添加，如果是官方MySQL，参数是relay_log_recovery=1
具体请参考：
本文出自 “贺春旸的技术专栏” 博客，请务必保留此出处
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