mysql mgr bug_Mysql MGR架构误操作引发的问题处理
【背景介紹】
故障方描述:一次用戶刷權(quán)限的時(shí)候不小心把數(shù)據(jù)庫(kù)用戶表記錄刪掉了,執(zhí)行之后發(fā)現(xiàn)不對(duì)后重建用戶,殺掉進(jìn)程后重新MGR啟動(dòng)報(bào)錯(cuò)。
【報(bào)錯(cuò)信息】
2018-06-13T12:47:41.405593Z 32 [Note] Plugin group_replication reported: 'Group communication SSL configuration: group_replication_ssl_mode: "DISABLED"'
2018-06-13T12:47:41.405820Z 32 [Note] Plugin group_replication reported: '[GCS] Added automatically IP ranges 127.0.0.1/8,172.xx.xxx.xxx/26,192.xxx.xx.xxx/24 to the whitelist'
2018-06-13T12:47:41.406172Z 32 [Note] Plugin group_replication reported: '[GCS] SSL was not enabled'
2018-06-13T12:47:41.406216Z 32 [Note] Plugin group_replication reported: 'Initialized group communication with configuration: group_replication_group_name: "b47a8cea-6cf5-4ea4-933f-a8c20905f900"; group_replication_local_address: "172.xx.xxx.xxx:xxx1"; group_replication_group_seeds: "172.xx.xxx.xxx:xxx1,172.xx.xxx.xxx:24901,172.xx.xxx.xxx:xxxx1"; group_replication_bootstrap_group: true; group_replication_poll_spin_loops: 0; group_replication_compression_threshold: 100; group_replication_ip_whitelist: "AUTOMATIC"'
2018-06-13T12:47:41.406944Z 34 [Note] 'CHANGE MASTER TO FOR CHANNEL 'group_replication_applier' executed'. Previous state master_host='', master_port= 0, master_log_file='', master_log_pos= 4, master_bind=''. New state master_host='', master_port= 0, master_log_file='', master_log_pos= 4, master_bind=''.
2018-06-13T12:47:41.434136Z 34 [ERROR] Slave SQL for channel 'group_replication_applier': Slave failed to initialize relay log info structure from the repository, Error_code: 1872
2018-06-13T12:47:41.434183Z 34 [ERROR] Plugin group_replication reported: 'Error while starting the group replication applier thread'
2018-06-13T12:47:41.434323Z 34 [Note] Plugin group_replication reported: 'The group replication applier thread was killed'
2018-06-13T12:47:41.434389Z 32 [ERROR] Plugin group_replication reported: 'Unable to initialize the Group Replication applier module.'
2018-06-13T12:47:41.434551Z 32 [Note] Plugin group_replication reported: 'Requesting to leave the group despite of not being a member'
2018-06-13T12:47:41.434588Z 32 [ERROR] Plugin group_replication reported: '[GCS] The member is leaving a group without being on one.'
【問題分析】
從報(bào)錯(cuò)日志查看,數(shù)據(jù)庫(kù)在識(shí)別relay log時(shí)出現(xiàn)問題,從Oracle官方文檔可以確認(rèn)異常終止MGR服務(wù)命中了Bug25534078:
MySQL Innodb Cluster Node Failed To Start With Error: "[ERROR] Slave SQL for channel 'group_replication_applier': Slave failed to initialize relay log info structure from the repository, Error_code: 1872" (文檔 ID 2386403.1)
進(jìn)行信息查詢符合上面BUG現(xiàn)象:
【解決辦法】
清理mysql.slave_relay_log_info時(shí)先記錄日志信息,按照如下方法正常修復(fù),同時(shí)建議參數(shù)文件要指定relay log參數(shù)路徑。
但是由于再重新創(chuàng)建用戶時(shí),沒有關(guān)閉binlog同步到其他節(jié)點(diǎn),導(dǎo)致其他節(jié)點(diǎn)加入集群是報(bào)錯(cuò)。
提供第一個(gè)方案:進(jìn)行reset master(此操作非常危險(xiǎn)),但是由于MGR本身存在問題時(shí)間比較久導(dǎo)致binlog過期丟失,因此無法修復(fù)。
提供第二個(gè)方案:暫時(shí)提供單節(jié)點(diǎn)服務(wù),制定好方案后,找另一個(gè)時(shí)間窗口對(duì)MGR架構(gòu)進(jìn)行修復(fù)。
【總結(jié)】
在涉及數(shù)據(jù)庫(kù)重要配置時(shí),謹(jǐn)慎操作。
在出現(xiàn)問題的時(shí)候更加注意再次誤操作,導(dǎo)致更加難恢復(fù)。
對(duì)數(shù)據(jù)庫(kù)重要進(jìn)程進(jìn)行監(jiān)控,及時(shí)發(fā)現(xiàn)問題及時(shí)修復(fù)。
總結(jié)
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