mysql主从出错

show slave status G  提示如下错误
Relay log read failure: Could not parse relay log event entry. The possible reasons are:
the master's binary log is corrupted (you can check this by running 'MySQLbinlog' on the binary log),
the slave's relay log is corrupted (you can check this by running 'mysqlbinlog' on the relay log),
a network problem, or a bug in the master's or slave's MySQL code. If you want to check the master's
binary log or slave's relay log, you will be able to know their names by issuing 'SHOW SLAVE STATUS' on this slave.

原因
在传输master log-bin时，因网络原因或slave机压力问题，造成log-relay文件格式错误

解决方法一：
找到relay-log.info，第一行记录了当前正在执行的log-relay文件名
找到该文件的下一个文件
使用mysqlbinlog查看该文件，在#98这行有Rotate to log-bin.000004 pos: 4等信息，这就是目前slave停止的位置
在slave上重新指定同步位置，重新执行：
change master to
master_host='1.1.1.1',
master_user='repl',
master_password='111111',
master_port=3306,
master_log_file='log-bin.000004',
master_log_pos=4;
slave start;
show slave statusG;

解决方法二：
stop slave之后，重新reset slave;
再看，数据已经开始同步了

使用第一种方法问题解决