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]# uptime07:54:00 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 eventMaster_Host: 123.150.185.190Master_User: slaveMaster_Port: 3306Connect_Retry: 60Master_Log_File: mysql-bin.000393Read_Master_Log_Pos: 252376610Relay_Log_File: relay-bin.000468Relay_Log_Pos: 189083515Relay_Master_Log_File: mysql-bin.000393Slave_IO_Running: YesSlave_SQL_Running: NoReplicate_Do_DB:Replicate_Ignore_DB:Replicate_Do_Table:Replicate_Ignore_Table:Replicate_Wild_Do_Table:Replicate_Wild_Ignore_Table:Last_Errno: 1594Last_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: 0Exec_Master_Log_Pos: 180112968Relay_Log_Space: 264877714Until_Condition: NoneUntil_Log_File:Until_Log_Pos: 0Master_SSL_Allowed: NoMaster_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: NoLast_IO_Errno: 0Last_IO_Error:Last_SQL_Errno: 1594Last_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

………………………………

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 eventMaster_Host: 123.150.185.190Master_User: slaveMaster_Port: 3306Connect_Retry: 60Master_Log_File: mysql-bin.000394Read_Master_Log_Pos: 13922311Relay_Log_File: relay-bin.000004Relay_Log_Pos: 14615799Relay_Master_Log_File: mysql-bin.000394Slave_IO_Running: YesSlave_SQL_Running: YesReplicate_Do_DB:Replicate_Ignore_DB:Replicate_Do_Table:Replicate_Ignore_Table:Replicate_Wild_Do_Table:Replicate_Wild_Ignore_Table:Last_Errno: 0Last_Error:Skip_Counter: 0Exec_Master_Log_Pos: 13922311Relay_Log_Space: 14615991Until_Condition: NoneUntil_Log_File:Until_Log_Pos: 0Master_SSL_Allowed: NoMaster_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: NoLast_IO_Errno: 0Last_IO_Error:Last_SQL_Errno: 0Last_SQL_Error:
1 row in set (0.00 sec)