my26_Slave failed to initialize relay log info structure from the repository

重启了一下从库，忘记先stop slave ，直接mysqladmin shutdown关闭实例，结果起不来了

mysql> start slave;
ERROR 1872 (HY000): Slave failed to initialize relay log info structure from the repository

这个错误就是relay log有问题，但我看自己的配置中有配置relay_log参数，但为什么从库启动会在此处出问题呢

重新开启同步，先记下当前从库同步的位置

mysql> show slave status\G;
*************************** . row ***************************
               Slave_IO_State:
                  Master_Host: 10.*.*.*
                  Master_User: db_slave
                  Master_Port:
                Connect_Retry:
              Master_Log_File: mysql-bin.
          Read_Master_Log_Pos: 

reset master;
reset slave all;

mysql> CHANGE MASTER TO
-> MASTER_HOST='10.***',
-> MASTER_USER='db_slave',
-> MASTER_PASSWORD='***********',
-> MASTER_PORT=3301,
-> MASTER_LOG_FILE='mysql-bin.013463',
-> MASTER_LOG_POS=247058609,
-> MASTER_CONNECT_RETRY=10;
ERROR 29 (HY000): File '/data/mysql_3301/var/mysql-relay-bin.000001' not found (Errcode: 2 - No such file or directory)

结果还是报错，还是关于relay log的，然后

修改配置文件，新建一个目录，重新为relay log指定一个目录，不再使用原来的目录

relay_log                      = /data/mysql_3301/log/mysql-relay-bin

再次CHANGE MASTER TO……，start slave，这次从库成功启动了