MySQL GTID复制错误处理之跳过错误
某Slave报错信息：
mysql> show slave status\G;
mysql> show slave status\G; *************************** 1. row *************************** Slave_IO_State: Waiting for master to send event Master_Host: 192.168.206.140 Master_User: u_repl Master_Port: 3306 Connect_Retry: 60 Master_Log_File: mysql-bin.000002 Read_Master_Log_Pos: 499 Relay_Log_File: localhost-relay-bin.000002 Relay_Log_Pos: 367 Relay_Master_Log_File: mysql-bin.000001 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: 1007 Last_Error: Coordinator stopped because there were error(s) in the worker(s). The most recent failure being: Worker 1 failed executing transaction '9e2c7c0f-0908-11e7-8230-000c29ab7544:1' at master log mysql-bin.000001, end_log_pos 313. See error log and/or performance_schema.replication_applier_status_by_worker table for more details about this failure or others, if any. Skip_Counter: 0 Exec_Master_Log_Pos: 154 Relay_Log_Space: 1513 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: 1007 Last_SQL_Error: Coordinator stopped because there were error(s) in the worker(s). The most recent failure being: Worker 1 failed executing transaction '9e2c7c0f-0908-11e7-8230-000c29ab7544:1' at master log mysql-bin.000001, end_log_pos 313. See error log and/or performance_schema.replication_applier_status_by_worker table for more details about this failure or others, if any. Replicate_Ignore_Server_Ids: Master_Server_Id: 140 Master_UUID: 9e2c7c0f-0908-11e7-8230-000c29ab7544 Master_Info_File: mysql.slave_master_info SQL_Delay: 0 SQL_Remaining_Delay: NULL Slave_SQL_Running_State: Master_Retry_Count: 86400 Master_Bind: Last_IO_Error_Timestamp: Last_SQL_Error_Timestamp: 170316 04:25:29 Master_SSL_Crl: Master_SSL_Crlpath: Retrieved_Gtid_Set: 9e2c7c0f-0908-11e7-8230-000c29ab7544:1-2 Executed_Gtid_Set: 347cbac6-0906-11e7-b957-000c2981a46e:1, c59a2526-08fd-11e7-a5c7-000c296f2953:1-2 Auto_Position: 1 Replicate_Rewrite_DB: Channel_Name: Master_TLS_Version: 1 row in set (0.00 sec) ERROR: No query specified
GTID的复制对于错误信息的可读性不是很好，但可以通过错误代码（1007）从监控表replication_applier_status_by_worker查看：
mysql> select * from performance_schema.replication_applier_status_by_worker where LAST_ERROR_NUMBER=1007\G
mysql> select * from performance_schema.replication_applier_status_by_worker where LAST_ERROR_NUMBER=1007\G *************************** 1. row *************************** CHANNEL_NAME: WORKER_ID: 2 THREAD_ID: NULL SERVICE_STATE: OFF LAST_SEEN_TRANSACTION: 9e2c7c0f-0908-11e7-8230-000c29ab7544:1 LAST_ERROR_NUMBER: 1007 LAST_ERROR_MESSAGE: Worker 1 failed executing transaction '9e2c7c0f-0908-11e7-8230-000c29ab7544:1' at master log mysql-bin.000001, end_log_pos 313; Error 'Can't create database 'mydb'; database exists' on query. Default database: 'mydb'. Query: 'create database mydb' LAST_ERROR_TIMESTAMP: 2017-03-16 04:25:29 1 row in set (0.00 sec)
使用GTID跳过错误的方法：找到错误的GTID跳过（通过Exec_Master_Log_Pos去binlog里找GTID，或则通过上面监控表replication_applier_status_by_worker找到GTID，也可以通过Executed_Gtid_Set算出GTID），这里使用监控表来找到错误的GTID。找到GTID之后，跳过错误的步骤：
mysql> stop slave; #停止同步 Query OK, 0 rows affected (0.02 sec) mysql> set @@session.gtid_next='9e2c7c0f-0908-11e7-8230-000c29ab7544:1'; #跳过错误的GTID Query OK, 0 rows affected (0.00 sec) mysql> begin; #提交一个空事务，因为设置gtid_next后，gtid的生命周期就开始了，必须通过显性的提交一个事务来结束，否则报错：ERROR 1790 (HY000): @@SESSION.GTID_NEXT cannot be changed by a client that owns a Query OK, 0 rows affected (0.00 sec) mysql> commit; Query OK, 0 rows affected (0.01 sec) mysql> set @@session.gtid_next=automatic; #设置回自动模式 Query OK, 0 rows affected (0.00 sec) mysql> start slave; Query OK, 0 rows affected (0.02 sec)
再次确认slave同步状况
mysql> show slave status\G;
mysql> show slave status\G; *************************** 1. row *************************** Slave_IO_State: Waiting for master to send event Master_Host: 192.168.206.140 Master_User: u_repl Master_Port: 3306 Connect_Retry: 60 Master_Log_File: mysql-bin.000002 Read_Master_Log_Pos: 499 Relay_Log_File: localhost-relay-bin.000004 Relay_Log_Pos: 454 Relay_Master_Log_File: mysql-bin.000002 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: 499 Relay_Log_Space: 2024 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: Replicate_Ignore_Server_Ids: Master_Server_Id: 140 Master_UUID: 9e2c7c0f-0908-11e7-8230-000c29ab7544 Master_Info_File: mysql.slave_master_info SQL_Delay: 0 SQL_Remaining_Delay: NULL Slave_SQL_Running_State: Slave has read all relay log; waiting for more updates Master_Retry_Count: 86400 Master_Bind: Last_IO_Error_Timestamp: Last_SQL_Error_Timestamp: Master_SSL_Crl: Master_SSL_Crlpath: Retrieved_Gtid_Set: 9e2c7c0f-0908-11e7-8230-000c29ab7544:1-2 Executed_Gtid_Set: 347cbac6-0906-11e7-b957-000c2981a46e:1, 9e2c7c0f-0908-11e7-8230-000c29ab7544:1-2, c59a2526-08fd-11e7-a5c7-000c296f2953:1-2 Auto_Position: 1 Replicate_Rewrite_DB: Channel_Name: Master_TLS_Version: 1 row in set (0.00 sec) ERROR: No query specified
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