Home Database Mysql Tutorial MySQL Slave异常关机的处理 (pt-slave-restart)

MySQL Slave异常关机的处理 (pt-slave-restart)

Jun 07, 2016 pm 04:50 PM

MySQL Slave异常关机的处理 (pt-slave-restart)

MySQL Slave异常关机的处理除了后面的三个方法。
还可以使用percona-toolkit的pt-slave-restart命令。

percona-toolkit-2.2.8-1.noarch.rpm 需要安装一些依赖包。

  • yum install perl perl-DBI perl-DBD-MySQL perl-IO-Socket-SSL perl-Time-HiRes
  • 模拟异常关机的处理
    1.JAVA程序不断写入Master

    2.关闭Slave虚拟机
    在JAVA程序运行当中,直接强制关闭Slave虚拟机。然后重新启动Slave

    这个表除了自增的ID,就是name字段,默认都是test
    现在在slave上修改name字段为‘mysql’
    update test set;

    3.使用pt-slave-restart命令修复错误。

    发现还有1594的错误


    重新连接Master
    参考:



    最后查看复制的情况,,已经正常运行了。

    我们在Master输入的name都是test,而在Slave故障之后,将name都改为了mysql。
    一般来说,处理主键重复无外乎两种方式(我能想到的)
    1.忽略Master发来的重复的binlog事件
    2.使用Master的binlog事件更新slave数据
    如果是第一种方式,slave的name应该都是mysql
    如果是第二种方式,应该前部分是mysql,后一部分是test

    测试结果如下,可以初步表明使用的是第二种方式。
    下面302条name为'test'的记录都是异常关机时,已经执行却没有将pos写入文件的那部分数据。
    pt-slave-restart将这部分数据的binlog重新执行,所以它们的name为'test’。

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