异常之从 start slave 无法启动

1. 重置 slave 配置就行了。
2. 启动从时报错：

   mysql> start slave;

   ERROR 1872 (HY000): Slave failed to initialize relay log info structure from the repository

    

   reset slave之后可以：

   mysql> reset slave;

   Query OK, 0 rows affected (0.00 sec)

    

   mysql> change master to master_host='172.16.1.1', master_user='re1', master_password='re1' ,master_log_file='1.000016', master_log_pos=430;

   Query OK, 0 rows affected, 2 warnings (0.04 sec)

    

   mysql> start slave;

   Query OK, 0 rows affected (0.02 sec)