MySQL主从报错1872 Slave failed to initialize relay log info structure from the repository【原创】

一台MySQL服务器重启后发现主从复制报错

Last_Errno: 1872

Last_Error: Slave failed to initialize relay log info structure from the repository

mysql> show slave statusG;
*************************** 1. row ***************************
               Slave_IO_State: 
                  Master_Host: X.X.X.X
                  Master_User: repl
                  Master_Port: 3306
                Connect_Retry: 60
              Master_Log_File: mysql-bin.000076
          Read_Master_Log_Pos: 828924371
               Relay_Log_File: localhost-relay-bin.000188
                Relay_Log_Pos: 720496744
        Relay_Master_Log_File: mysql-bin.000076
             Slave_IO_Running: No
            Slave_SQL_Running: No
              Replicate_Do_DB: 
          Replicate_Ignore_DB: 
           Replicate_Do_Table: 
       Replicate_Ignore_Table: 
      Replicate_Wild_Do_Table: 
  Replicate_Wild_Ignore_Table: 
                   Last_Errno: 1872
                   Last_Error: Slave failed to initialize relay log info structure from the repository
                 Skip_Counter: 0
          Exec_Master_Log_Pos: 828924371
              Relay_Log_Space: 0
              Until_Condition: None
               Until_Log_File: 
                Until_Log_Pos: 0
           Master_SSL_Allowed: No
           Master_SSL_CA_File: 
           Master_SSL_CA_Path: 
              Master_SSL_Cert: 
            Master_SSL_Cipher: 
               Master_SSL_Key: 
        Seconds_Behind_Master: NULL
Master_SSL_Verify_Server_Cert: No
                Last_IO_Errno: 0
                Last_IO_Error: 
               Last_SQL_Errno: 1872
               Last_SQL_Error: Slave failed to initialize relay log info structure from the repository
  Replicate_Ignore_Server_Ids: 
             Master_Server_Id: 0
                  Master_UUID: 54481e1e-99ad-11e5-8540-000af78d3c6c
             Master_Info_File: /home/mysql/mysql-data/mysql/master.info
                    SQL_Delay: 0
          SQL_Remaining_Delay: NULL
      Slave_SQL_Running_State: 
           Master_Retry_Count: 86400
                  Master_Bind: 
      Last_IO_Error_Timestamp: 
     Last_SQL_Error_Timestamp: 210907 15:32:42
               Master_SSL_Crl: 
           Master_SSL_Crlpath: 
           Retrieved_Gtid_Set: 
            Executed_Gtid_Set: 
                Auto_Position: 0
         Replicate_Rewrite_DB: 
                 Channel_Name: 
1 row in set (0.00 sec)

ERROR: 
No query specified

 应该是服务器的主机名改过，relay-log也没有命名写在配置文件中。所以造成无法找到中继日志。

如果不命名会以主机名命名relay-log即

主机名-relay-bin.000001

解决办法：

可以在my.cnf指定中继日志名字，然后重启一下MySQL服务即可。

# cat /etc/my.cnf |grep relay
relay-log=db1-relay-bin

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