Slave failed to initialize relay log info structure from the repository

同事反应，重启备库后后，复制相关进程起不来：

  Replicate_Wild_Ignore_Table: 
                   Last_Errno: 1872
                   Last_Error: Slave failed to initialize relay log info structure from the repository
                 Skip_Counter: 0

查看错误日志，发现有以下报错：

2018-07-30T08:49:38.529578Z 479 [ERROR] log ./mysql-slave-relay-bin-semir_33.067300 listed in the index, but failed to stat.
2018-07-30T08:49:38.529619Z 479 [ERROR] Error counting relay log space.

查看对应的中继日志 ：mysql-slave-relay-bin-semir_33.067300 ，发现不存，经询问，空间不够将中继日志挪走了，

看来就是这个原因了