早上接到值班员的电话 说mysql 不同步了。

经查看发现机器早山无故断电了。

[root@twin14372 data]# uptime
 07:54:00 up 38 min,  1 user,  load average: 0.00, 0.01, 0.15

机房一天机器突然断电，导致slave损坏，报错如下：

[root@twin14372 ~]# mysql -u root -pb5fdb71d -e "show slave status\G"                      
*************************** 1. row ***************************
               Slave_IO_State: Waiting for master to send event
                  Master_Host: 123.150.185.190
                  Master_User: slave
                  Master_Port: 3306
                Connect_Retry: 60
              Master_Log_File: mysql-bin.000393
          Read_Master_Log_Pos: 252376610
               Relay_Log_File: relay-bin.000468
                Relay_Log_Pos: 189083515
        Relay_Master_Log_File: mysql-bin.000393
             Slave_IO_Running: Yes
            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: 1594
                   Last_Error: Relay log read failure: Could not parse relay log event entry. The possible reasons are: the master's binary log is corrupted (you can check this by running 'mysqlbinlog' on the binary log), the slave's relay log is corrupted (you can check this by running 'mysqlbinlog' on the relay log), a network problem, or a bug in the master's or slave's MySQL code. If you want to check the master's binary log or slave's relay log, you will be able to know their names by issuing 'SHOW SLAVE STATUS' on this slave.
                 Skip_Counter: 0
          Exec_Master_Log_Pos: 180112968
              Relay_Log_Space: 264877714
              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: 1594
               Last_SQL_Error: Relay log read failure: Could not parse relay log event entry. The possible reasons are: the master's binary log is corrupted (you can check this by running 'mysqlbinlog' on the binary log), the slave's relay log is corrupted (you can check this by running 'mysqlbinlog' on the relay log), a network problem, or a bug in the master's or slave's MySQL code. If you want to check the master's binary log or slave's relay log, you will be able to know their names by issuing 'SHOW SLAVE STATUS' on this slave.


值得注意：

Master_Log_File: mysql-bin.000393

Read_Master_Log_Pos: 252376610

Relay_Log_File: relay-bin.000468

Relay_Log_Pos: 189083515

Relay_Master_Log_File: mysql-bin.000393

………………………………

Skip_Counter: 0
Exec_Master_Log_Pos: 180112968
Relay_Log_Space: 264877714
Until_Condition: None

记住红色标记的地方：

Master_Log_File: mysql-bin.000393

Exec_Master_Log_Pos: 180112968

解决办法：

mysql> stop slave;
Query OK, 0 rows affected (0.00 sec)
mysql> CHANGE MASTER TO MASTER_HOST='123.150.185.190',  MASTER_PORT=3306, MASTER_USER='slave', MASTER_PASSWORD='b5fdb71d', MASTER_LOG_FILE='mysql-bin.000393', MASTER_LOG_POS=180112968;
Query OK, 0 rows affected (0.09 sec)
mysql> start slave;
Query OK, 0 rows affected (0.00 sec)


ok了slave正常运行了

mysql> show slave status\G
*************************** 1. row ***************************
               Slave_IO_State: Waiting for master to send event
                  Master_Host: 123.150.185.190
                  Master_User: slave
                  Master_Port: 3306
                Connect_Retry: 60
              Master_Log_File: mysql-bin.000394
          Read_Master_Log_Pos: 13922311
               Relay_Log_File: relay-bin.000004
                Relay_Log_Pos: 14615799
        Relay_Master_Log_File: mysql-bin.000394
             Slave_IO_Running: Yes
            Slave_SQL_Running: Yes
              Replicate_Do_DB:
          Replicate_Ignore_DB:
           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: 13922311
              Relay_Log_Space: 14615991
              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:
1 row in set (0.00 sec)