MySQL Slave异常关机的处理 (pt-slave-restart)_MySQL
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
-
import java.sql.Connection
;
- import java.sql.DriverManager;
- import java.sql.PreparedStatement;
- import java.sql.SQLException;
- publicclassTest{
- publicstatic void main(String[]args)throws ClassNotFoundException,
- SQLException{
- long start=System.currentTimeMillis();
- Class.forName("com.mysql.jdbc.Driver");
- Connection connection=DriverManager.getConnection(
- "jdbc:mysql://192.168.1.70:3306/xx","xx","xx");
- connection.setAutoCommit(true);
- PreparedStatement cmd=connection
- .prepareStatement("insert into test(name) values(?)");
- for(inti=0;i
- cmd.setString(1,"test");
- cmd.executeUpdate();
- }
- connection.commit();
- cmd.close();
- connection.close();
- longend=System.currentTimeMillis();
- System.out.println(end-start);
- }
- }
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

启动之后,发现复制出现异常。(Show slave status/G)

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 name='mysql';
3.使用
pt-slave-restart
命令修复错误。
- [root@mysql2 ~]# pt-slave-restart --user=root --password=xxxxxxx--error-numbers=1062
- 2014-06-16T01:17:47 p=...,u=root mysql2-relay-bin.000003 312116 1062
- 2014-06-16T01:17:47 p=...,u=root mysql2-relay-bin.000003 312373 1062
- 2014-06-16T01:17:47 p=...,u=root mysql2-relay-bin.000003 312630 1062
- 2014-06-16T01:17:47 p=...,u=root mysql2-relay-bin.000003 312887 1062
- 2014-06-16T01:17:48 p=...,u=root mysql2-relay-bin.000003 313144 1062
- 2014-06-16T01:17:48 p=...,u=root mysql2-relay-bin.000003 313401 1062
- 2014-06-16T01:17:48 p=...,u=root mysql2-relay-bin.000003 313658 1062
- 2014-06-16T01:17:48 p=...,u=root mysql2-relay-bin.000003 313915 1062
- 2014-06-16T01:17:48 p=...,u=root mysql2-relay-bin.000003 314172 1062
- 2014-06-16T01:17:48 p=...,u=root mysql2-relay-bin.000003 314429 1062
- 2014-06-16T01:17:48 p=...,u=root mysql2-relay-bin.000003 314686 1062
- 2014-06-16T01:17:48 p=...,u=root mysql2-relay-bin.000003 314943 1062
- 2014-06-16T01:17:48 p=...,u=root mysql2-relay-bin.000003 315200 1594
- Error 1594 is not in --error-numbers.
发现还有1594的错误

重新连接Master
参考:http://www.linuxidc.com/Linux/2014-07/104235.htm

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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