MySQL主从失败错误Got fatal error 1236解决方法

December 27, 2011

由于主服务器异外重启, 导致从报错, 错误如下:
show slave status错误:

mysql> show slave status\G
    Master_Log_File: mysql-bin.000288
    Read_Master_Log_Pos: 627806304
    Relay_Log_File: mysql-relay-bin.000990
    Relay_Log_Pos: 627806457
    Relay_Master_Log_File: mysql-bin.000288
    Slave_IO_Running: No
    Slave_SQL_Running: Yes
    Exec_Master_Log_Pos: 627806304
    Relay_Log_Space: 627806663
    
    
    ......
    Last_IO_Error: Got fatal error 1236 from master when  reading data from binary log:
    'Client requested master to start  replication from impossible position'

mysql错误日志:

tail /data/mysql/mysql-error.log
    111010 17:35:49 [ERROR] Error reading packet from server: Client requested master
     to start replication from impossible position ( server_errno=1236)
    111010 17:35:49 [ERROR] Slave I/O: Got fatal error 1236 from master when reading data
    from binary log: 'Client requested master to start replication from impossible
    position', Error_code: 1236
    111010 17:35:49 [Note] Slave I/O thread exiting, read up to log 'mysql-bin.000288',
    position 627806304

按照习惯, 先尝试必改position位置.

mysql> stop slave;
    mysql> change master to master_log_file='mysql-bin.000288',master_log_pos=627625751;
    mysql> start slave;

错误依旧, 接下来登陆到主服务器查看binlog日志.
先按照错误点的标记去主服务器日志中查找:

[root@db1 ~]# mysqlbinlog --start-position=627655136 /data/mysql/binlog/mysql-bin.000288
    /*!40019 SET @@session.max_insert_delayed_threads=0*/;
    /*!50003 SET @OLD_COMPLETION_TYPE=@@COMPLETION_TYPE,COMPLETION_TYPE=0*/;
    DELIMITER /*!*/;
    # at 4
    #111010 13:31:19 server id 4 end_log_pos 106 Start: binlog v 4, server v 5.1.45-log
    created 111010 13:31:19
    # Warning: this binlog is either in use or was not closed properly.
    BINLOG '
    F1aTTg8EAAAAZgAAAGoAAAABAAQANS4xLjQ1LWxvZwAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA
    AAAAAAAAAAAAAAAAAAAAAAAAEzgNAAgAEgAEBAQEEgAAUwAEGggAAAAICAgC
    '/*!*/;
    DELIMITER ;
    # End of log file
    ROLLBACK /* added by mysqlbinlog */;
    /*!50003 SET COMPLETION_TYPE=@OLD_COMPLETION_TYPE*/;

没有看到这个位置.

[root@db1 ~]# mysqlbinlog /data/mysql/binlog/mysql-bin.000288 > test.txt

less text.txt
看最后一部分

# at 627625495
    #111010 16:35:46 server id 1 end_log_pos 627625631 Query thread_id=45613333
    exec_time=32758 error_code=0
    SET TIMESTAMP=1318289746/*!*/;
    delete from freeshipping_bef_update where part='AR-4006WLM' and code=''
    /*!*/;
    # at 627625631
    #111010 16:35:46 server id 1 end_log_pos 627625751 Query thread_id=45613333
    exec_time=32758 error_code=0
    SET TIMESTAMP=1318289746/*!*/;
    delete from shippingFee_special where part='AR-4006WLM'
    /*!*/;
    DELIMITER ;
    # End of log file
    ROLLBACK /* added by mysqlbinlog */;
    /*!50003 SET COMPLETION_TYPE=@OLD_COMPLETION_TYPE*/;

找到最接近错误标记627655136的一个position是627625631.

再回到slave机器上change master, 将postion指向这个位置.

mysql> stop slave;
    Query OK, 0 rows affected (0.00 sec)
    
    mysql> change master to master_log_file='mysql-bin.000288',master_log_pos=627625631;
    Query OK, 0 rows affected (0.06 sec)
    
    mysql> start slave;
    Query OK, 0 rows affected (0.00 sec)

再次查看

mysql> show slave status\G
    *************************** 1. row ***************************
    Slave_IO_State: Queueing master event to the relay log
    Master_Host: 192.168.21.105
    Master_User: rep
    Master_Port: 3306
    Connect_Retry: 10
    Master_Log_File: mysql-bin.000289
    Read_Master_Log_Pos: 25433767
    Relay_Log_File: mysql-relay-bin.000003
    Relay_Log_Pos: 630
    Relay_Master_Log_File: mysql-bin.000289
    Slave_IO_Running: Yes
    Slave_SQL_Running: Yes

主从同步正常了, 同样的方法修复其它slave机器.

mysql运行在nat环境下的报错：
```
ERROR 2013 (HY000): Lost connection to MySQL server at 'reading initial communication packet', system error: 2
```
解决办法：
```
bind-address = 0.0.0.0
```

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