mysql 主從複製如何跳過報錯
阿新 • • 發佈:2020-10-28
一、傳統binlog主從複製,跳過報錯方法
mysql> stop slave; mysql> set global sql_slave_skip_counter = 1; mysql> start slave; mysql> show slave status \G
二、GTID主從複製,跳過報錯方法
mysql> stop slave; #先關閉slave複製; mysql> change master to ...省略... #配置主從複製; mysql> show slave status\G #檢視主從狀態;
發現報錯:
mysql> show slave status\G *************************** 1. row *************************** Slave_IO_State: Waiting for master to send event Master_Host: 172.19.195.212 Master_User: master-slave Master_Port: 3306 Connect_Retry: 60 Master_Log_File: mysql-bin.000021 Read_Master_Log_Pos: 194 Relay_Log_File: nginx-003-relay-bin.000048 Relay_Log_Pos: 454 Relay_Master_Log_File: mysql-bin.000016 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: Error 'Can't create database 'code'; database exists' on query. Default database: 'code'. Query: 'create database code' Skip_Counter: 0 Exec_Master_Log_Pos: 8769118 Relay_Log_Space: 3500 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: Error 'Can't create database 'code'; database exists' on query. Default database: 'code'. Query: 'create database code' Replicate_Ignore_Server_Ids: Master_Server_Id: 100 Master_UUID: fea89052-11ef-11eb-b241-00163e00a190 Master_Info_File: /usr/local/mysql/data/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: 201022 09:31:29 Master_SSL_Crl: Master_SSL_Crlpath: Retrieved_Gtid_Set: fea89052-11ef-11eb-b241-00163e00a190:8-5617 Executed_Gtid_Set: a56c9b04-11f1-11eb-a855-00163e128853:1-11224,fea89052-11ef-11eb-b241-00163e00a190:1-5614 Auto_Position: 1 Replicate_Rewrite_DB: Channel_Name: Master_TLS_Version: 1 row in set (0.01 sec)
可以看到 Slave_SQL_Running 為 NO,表示執行取回的二進位制日誌出了問題;
在 Last_Error 中也可以看到大概的報錯;(因為我之前的操作,大概可以判斷出 是因為主庫的二進位制日誌中有建立code庫的sql,而從庫上我已經建立了這個庫,應該是產生了衝突;)
解決方法:
1、如果清楚自己之前的操作,可以將從庫中產生衝突的庫刪除;
2、或者通過跳過GTID報錯的事務的方法
--- 通過 Last_SQL_Errno 報錯編號查詢具體的報錯事務 mysql> select * from performance_schema.replication_applier_status_by_worker where LAST_ERROR_NUMBER=1007\G *************************** 1. row *************************** CHANNEL_NAME: WORKER_ID: 0 THREAD_ID: NULL SERVICE_STATE: OFF LAST_SEEN_TRANSACTION: fea89052-11ef-11eb-b241-00163e00a190:5615 LAST_ERROR_NUMBER: 1007 LAST_ERROR_MESSAGE: Error 'Can't create database 'code'; database exists' on query. Default database: 'code'. Query: 'create database code' LAST_ERROR_TIMESTAMP: 2020-10-22 09:31:29 1 row in set (0.00 sec) mysql> stop slave; Query OK,0 rows affected (0.00 sec) --- 跳過查詢到報錯的事務(LAST_SEEN_TRANSACTION 的值) mysql> set @@session.gtid_next='fea89052-11ef-11eb-b241-00163e00a190:5615'; Query OK,0 rows affected (0.00 sec) mysql> begin; Query OK,0 rows affected (0.00 sec) --- 提交一個空的事務,因為設定gtid_next後,gtid的生命週期開始了,必須通過顯性的提交一個事務來結束; mysql> commit; Query OK,0 rows affected (0.00 sec) --- 設定回自動模式; mysql> set @@session.gtid_next=automatic; Query OK,0 rows affected (0.00 sec) mysql> start slave; Query OK,0 rows affected (0.00 sec)
通過以上步驟,就跳過了這次的GTID報錯的事務,如果 start slave 之後還是有報錯,那麼就按照此步驟繼續跳過;
經驗豐富的話,基本不用查詢事務,通過 Executed_Gtid_Set 就可以判斷出報錯的事務是 fea89052-11ef-11eb-b241-00163e00a190:5615 了;因為執行事務,到 fea89052-11ef-11eb-b241-00163e00a190:1-5614 的時候報錯了,應該可以判斷是 5615事務出現的錯誤;
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