После очередного обновления MySQL (c версии 5.5.13 на 5.6.10) репликация почему-то развалилась с таким вот жутко информационно насыщенным сообщением об ошибке:

mysql> start slave;  
ERROR 1593 (HY000): Fatal error: %s

А в error.log появляется такое:

2013-03-13 12:35:59 30937 [ERROR] Slave SQL: Fatal error: Failed to initialize the master info structure, Error_code: 1593

Лечится так.

1. На slave-е говорим:

   mysql> RESET SLAVE ALL;
   Query OK, 0 rows affected (0.00 sec)

2. Удаляем на slave-е все relay-логи:

   [root]# cd /var/lib/mysql 
   [root /var/lib/mysql]# ls *relay-bin*
   dc333-relay-bin.003213  dc333-relay-bin.003214  dc333-relay-bin.index
   [root /var/lib/mysql]# rm *relay-bin*

3. Перезапускаем репликацию заново:

   mysql> CHANGE MASTER TO MASTER_HOST='10.10.10.10', MASTER_PORT=3306, MASTER_USER='repl', MASTER_PASSWORD='Ua4R5hW', MASTER_LOG_FILE='serv1-bin.003147', MASTER_LOG_POS=120;
   Query OK, 0 rows affected, 2 warnings (0.01 sec)
    
   mysql> START SLAVE;  
   Query OK, 0 rows affected (0.00 sec)
    
   mysql> SHOW SLAVE STATUS \G
   *************************** 1. row ***************************
                  Slave_IO_State: Waiting for master to send event
                     Master_Host: 10.10.10.10
                     Master_User: repl
                     Master_Port: 3306
                   Connect_Retry: 60
                 Master_Log_File: serv1-bin.003147
             Read_Master_Log_Pos: 120
                  Relay_Log_File: serv2-relay-bin.000002
                   Relay_Log_Pos: 285
           Relay_Master_Log_File: serv1-bin.003147
                Slave_IO_Running: Yes
               Slave_SQL_Running: Yes
                 Replicate_Do_DB:
             Replicate_Ignore_DB: mysql
              Replicate_Do_Table:
          Replicate_Ignore_Table:
         Replicate_Wild_Do_Table:
     Replicate_Wild_Ignore_Table:
                      Last_Errno: 0
                      Last_Error:
                    Skip_Counter: 0
             Exec_Master_Log_Pos: 120
                 Relay_Log_Space: 460
                 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: 0
   Master_SSL_Verify_Server_Cert: No
                   Last_IO_Errno: 0
                   Last_IO_Error:
                  Last_SQL_Errno: 0
                  Last_SQL_Error:
     Replicate_Ignore_Server_Ids:
                Master_Server_Id: 1
                     Master_UUID: c2c33bd-ab18-1232-838e-e443a8da4ffb
                Master_Info_File: /var/lib/mysql/master.info
                       SQL_Delay: 0
             SQL_Remaining_Delay: NULL
         Slave_SQL_Running_State: Slave has read all relay log; waiting for the slave I/O thread to update it
              Master_Retry_Count: 86400
                     Master_Bind:
         Last_IO_Error_Timestamp:
        Last_SQL_Error_Timestamp:
                  Master_SSL_Crl:
              Master_SSL_Crlpath:
              Retrieved_Gtid_Set:
               Executed_Gtid_Set:
                   Auto_Position: 0
   1 row in set (0.00 sec)

А напоследок немного fun-а :)

Лучший в мире пример реализации SQL injection