My SQL 复制过程中,sql post thread如果执行某个SQL出错，则会自动停止并且在日志和show slave status中提示错误信息。

090303 22:36:31 [ERROR] Slave SQL: Could not execute

Delete_rows event on table CATY.buyer_info; Can’t find record in

‘buyer_info’, Error_code: 1032; handler error HA_ERR_KEY_NOT_FOUND; the

event’s master log mysql-bin.000004, end_log_pos 1581, Error_code: 1032

090303 22:36:31 [Warning] Slave: Can’t find record in ‘buyer_info’ Error_code: 1032

090303 22:36:31 [ERROR] Error running query, slave SQL thread aborted.

Fix the problem, and restart the slave SQL thread with “SLAVE START”.

We stopped at log ‘mysql-bin.000004′ position 1425

mysql> SHOW SLAVE STATUS \G

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

Slave_IO_State: Waiting for master to send event

Master_Host: qadb27.qa.ebay.com

Master_User: slave_user

Master_Port: 3306

Connect_Retry: 60

Master_Log_File: mysql-bin.000004

Read_Master_Log_Pos: 1608

Relay_Log_File: qadb17-relay-bin.006018

Relay_Log_Pos: 251

Relay_Master_Log_File: mysql-bin.000004

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: 1032

Last_Error: Could not execute Delete_rows event on table

CATY.buyer_info; Can’t find record in ‘buyer_info’, Error_code: 1032;

handler error HA_ERR_KEY_NOT_FOUND; the event’s master log

mysql-bin.000004, end_log_pos 1581

Skip_Counter: 0

Exec_Master_Log_Pos: 1425

Relay_Log_Space: 10066

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: 1032

Last_SQL_Error: Could not execute Delete_rows event on table

CATY.buyer_info; Can’t find record in ‘buyer_info’, Error_code: 1032;

handler error HA_ERR_KEY_NOT_FOUND; the event’s master log

mysql-bin.000004, end_log_pos 1581

1 row in set (0.00 sec)

如果错误记录可以fix或者忽略,则可以设置GLOBAL SQL_SLAVE_SKIP_COUNTER忽略sql thread的错误。

mysql> STOP SLAVE;

Query OK, 0 rows affected (0.00 sec)

mysql> SET GLOBAL SQL_SLAVE_SKIP_COUNTER = 1;

Query OK, 0 rows affected (0.00 sec)

mysql>START SLAVE;

Query OK, 0 rows affected (0.01 sec)

mysql> SHOW SLAVE STATUS \G

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

Slave_IO_State: Waiting for master to send event

Master_Host: qadb27.qa.ebay.com

Master_User: slave_user

Master_Port: 3306

Connect_Retry: 60

Master_Log_File: mysql-bin.000004

Read_Master_Log_Pos: 1608

Relay_Log_File: qadb17-relay-bin.006075

Relay_Log_Pos: 251

Relay_Master_Log_File: mysql-bin.000004

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: 1608

Relay_Log_Space: 552

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)

避免数据不一致可以在slave DB上设置GLOBAL read_only=true或者一定的用户权限。

也可编写高效的自动检测脚本重起sql thread。

是复制就会有数据不一致的问题的。