Slave SQL: Slave failed to initialize relay log info structure from the repository, Error_code: 1872
问题：
mysql> start slave;
ERROR 1872 (HY000): Slave failed to initialize relay log info structure from the repository
查看mysql错误日志：
解决方法：
应该是之前做过主从生成了主从同步日志，到mysql_data3306目录删除同步日志即可启动
rm -rf relay-log.info
