当slave意外宕机时,有可能会损坏中继日志relay-log,再次开启同步复制时,会出现报错。
解决方法:找到同步的binlog日志和POS点,然后重新进行同步,这样就可以有新的中继日志了。
下边看个案例,模拟了中继日志损坏的情况,查看到的信息如下:
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MySQL> show slave status \G
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ERROR 2006 (HY000): MySQL server has gone away
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No connection. Trying to reconnect...
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Connection id: 4
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Current database: test
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*************************** 1. row ***************************
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Slave_IO_State: Waiting for master to send event
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Master_Host: 10.10.10.200
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Master_User: repl
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Master_Port: 3306
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Connect_Retry: 60
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Master_Log_File: mysql-bin.000005
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Read_Master_Log_Pos: 220
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Relay_Log_File: mysql-relay-bin.000010
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Relay_Log_Pos: 283
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Relay_Master_Log_File: mysql-bin.000004
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Slave_IO_Running: Yes
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Slave_SQL_Running: No
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Replicate_Do_DB:
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Replicate_Ignore_DB:
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Replicate_Do_Table:
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Replicate_Ignore_Table:
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Replicate_Wild_Do_Table:
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Replicate_Wild_Ignore_Table:
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Last_Errno: 1032
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Last_Error: Could not execute Update_rows event on table test.test01; Can't find record in 'test01', Error_code: 1032; handler error HA_ERR_END_OF_FILE; the event's master log mysql-bin.000004, end_log_pos 310
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Skip_Counter: 0
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Exec_Master_Log_Pos: 120
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Relay_Log_Space: 2251
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Until_Condition: None
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Until_Log_File:
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Until_Log_Pos: 0
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Master_SSL_Allowed: No
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Master_SSL_CA_File:
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Master_SSL_CA_Path:
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Master_SSL_Cert:
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Master_SSL_Cipher:
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Master_SSL_Key:
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Seconds_Behind_Master: NULL
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Master_SSL_Verify_Server_Cert: No
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Last_IO_Errno: 0
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Last_IO_Error:
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Last_SQL_Errno: 1032
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Last_SQL_Error: Could not execute Update_rows event on table test.test01; Can't find record in 'test01', Error_code: 1032; handler error HA_ERR_END_OF_FILE; the event's master log mysql-bin.000004, end_log_pos 310
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Replicate_Ignore_Server_Ids:
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Master_Server_Id: 1
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Master_UUID: 4adfcd1d-4059-11e7-9532-080027d597f9
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Master_Info_File: mysql.slave_master_info
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SQL_Delay: 0
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SQL_Remaining_Delay: NULL
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Slave_SQL_Running_State:
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Master_Retry_Count: 86400
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Master_Bind:
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Last_IO_Error_Timestamp:
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Last_SQL_Error_Timestamp: 170808 11:45:26
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Master_SSL_Crl:
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Master_SSL_Crlpath:
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Retrieved_Gtid_Set:
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Executed_Gtid_Set:
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Auto_Position: 0
其中,涉及几个重要的参数:
slave_IO_Running:接受master的binlog的信息
master_Log_file:正在读取master上binlog日志名
Read_master_Log_Pos:正在读取master上当前binlog日志POS点。
slave_SQL_Running:执行写操作
Relay_master_Log_File:正在同步master上的binlog日志名。
Exec_master_Log_Pos:正在同步当前binlog日志的POS点。
以Relay_master_Log_File参数值和Exec_master_Log_Pos参数值为基准。
Relay_Log_File: mysql-relay-bin.000010
Relay_Log_Pos: 283
接下来开始重置主从复制:
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mysql> stop slave;
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Query OK, 0 rows affected (0.04 sec)
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mysql> change master to master_log_file='mysql-relay-bin.000010',master_log_pos=283;
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Query OK, 0 rows affected (0.06 sec)
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mysql> start slave;
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Query OK, 0 rows affected (0.12 sec)
通过这种方法可以修复中继日志,但是在MySQL5.5版本之后,在slave的my.cnf配置文件中加入relay_log_recovery=1就可以了。
文章题目:slave的中继日志relay-log损坏
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