slave中继日志损坏如何处理

Last_SQL_Error: Error initializing relay log position: I/O error reading the header from the binary log

Last_SQL_Error: Error initializing relay log position: Binlog has bad magic number;

It‘s not a binary log file that can be used by  this version of MySQL

手工修复

解决方法：找到同步的binlog和POS点，然后重新做同步，这样就可以有新的中继日值了。

mysql> show slave status\G;

*************************** 1. row ***************************

Master_Log_File: mysql-bin.000010

Read_Master_Log_Pos: 1191

Relay_Log_File: vm02-relay-bin.000005

Relay_Log_Pos: 253

Relay_Master_Log_File: mysql-bin.000010

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: 1593

Last_Error: Error initializing relay log position: I/O error reading the header from the binary log

Skip_Counter: 1

Exec_Master_Log_Pos: 821

Slave_IO_Running ：接收master的binlog信息

Master_Log_File

Read_Master_Log_Pos

Slave_SQL_Running：执行写操作

Relay_Master_Log_File

Exec_Master_Log_Pos

以执行写的binlog和POS点为准。

Relay_Master_Log_File: mysql-bin.000010

Exec_Master_Log_Pos: 821

mysql> stop slave;

Query OK, 0 rows affected (0.01 sec)

mysql> CHANGE MASTER TO MASTER_LOG_FILE=‘mysql-bin.000010‘,MASTER_LOG_POS=821;

Query OK, 0 rows affected (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: 192.168.8.22

Master_User: repl

Master_Port: 3306

Connect_Retry: 10

Master_Log_File: mysql-bin.000010

Read_Master_Log_Pos: 1191

Relay_Log_File: vm02-relay-bin.000002

Relay_Log_Pos: 623

Relay_Master_Log_File: mysql-bin.000010

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: 1191

Relay_Log_Space: 778

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:

如果嫌麻烦，可以在slave的配置文件里加上参数relay_log_recovery=1 就可以了