Loading... # 引言 如果要动生产环境,并且做的时陌生的领域,一定要在本机上先搭建测试,然后在开发环境(尽可能的和生产环境保持一致)进行测试,无误后再动生产,做到双保险。 # 错误信息 ```sql mysql> show slave status\G *************************** 1. row *************************** Slave_IO_State: Waiting for master to send event Master_Host: ***.***.***.*** Master_User: slave Master_Port: **** Connect_Retry: 60 Master_Log_File: mysql-bin.000056 Read_Master_Log_Pos: 156905389 Relay_Log_File: relay-log.000002 Relay_Log_Pos: 756 Relay_Master_Log_File: mysql-bin.000056 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: Coordinator stopped because there were error(s) in the worker(s). The most recent failure being: Workeperformance_schema.replication_applier_status_by_worker table for more details about this failure or others, if any. Skip_Counter: 0 Exec_Master_Log_Pos: 156849000 Relay_Log_Space: 57713 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: Coordinator stopped because there were error(s) in the worker(s). The most recent failure being: Workeperformance_schema.replication_applier_status_by_worker table for more details about this failure or others, if any. Replicate_Ignore_Server_Ids: Master_Server_Id: 1739 Master_UUID: 988480aa-728b-11eb-b830-00155d07057e 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: 210901 09:33:52 Master_SSL_Crl: Master_SSL_Crlpath: Retrieved_Gtid_Set: Executed_Gtid_Set: Auto_Position: 0 Replicate_Rewrite_DB: Channel_Name: Master_TLS_Version: 1 row in set (0.01 sec) ``` # 项目背景 1. Hadoop大数据平台 2. MySQL5.7.11 3. 等等 # TODO 因为MySQL负载有点大了,所以为了分担查询负载,故主从复制,让从来分担主的负载。 # 执行流程 备份数据库 mysqldump -uroot -pxxxxxxxx --databases -R xxx xxx xxx xxx > db.sql 查看log和pos,并且记录数据 show master status; 复制到目标服务器 scp db.sql root@xxx.xxx.xxx.xxx:/tmp/ 恢复数据 mysql -uroot -pxxxxxx <db.sql 设置Slave以及开启 change master to master_host='xxx.xxx.xxx.xxx', master_user='slave', master_password='xxxxxx', master_port=xxxx, master_log_file='mysql-bin.000056', master_log_pos=156919230, master_connect_retry=60; Start slave; :x: 报错 # 错误分析和解决 执行SQL语句: ```sql select * from performance_schema.replication_applier_status_by_worker\G ``` ```sql *************************** 1. row *************************** CHANNEL_NAME: WORKER_ID: 1 THREAD_ID: NULL SERVICE_STATE: OFF LAST_SEEN_TRANSACTION: ANONYMOUS LAST_ERROR_NUMBER: 1032 LAST_ERROR_MESSAGE: Worker 0 failed executing transaction 'ANONYMOUS' at master log mysql-bin.000056, end_log_pos 156848969; Could not execute Update_rows event on table cmf.cm_version; Can't find record in 'cm_version', Error_code: 1032; handler error HA_ERR_END_OF_FILE; the event's master log FIRST, end_log_pos 156848969 LAST_ERROR_TIMESTAMP: 2021-09-01 09:21:00 ``` 查看主表的cm_version,发现与从表对应不上,过一会儿刷新还会变,emm,这可咋整,回家睡觉了,结果今天来到公司,猛然间就想到了这一点,这样的话也可以通过`show master status\G`来验证,因为每过一会儿pos都会变,那么问题就大概解决了。也就是说当dump和查看pos时,需要复制SSH渠道,同时进行,因为cmf.cm_version中数据总是在变化,而改变时binlog会改变,因此pos也变了,所以需要同时进行,保证pos与dump一致。 来张图解释一下 ![image.png](https://www.zunmx.top/usr/uploads/2021/09/908407319.png) © 允许规范转载 打赏 赞赏作者 支付宝微信 赞 如果觉得我的文章对你有用,请随意赞赏