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HomeDatabaseMysql TutorialMySQL Patch – MirroredBinlogs (From Google)

这几天看了不少Google针对于MySQL开发的google-mysql-tools,找到一个很有意思的Patch:MirroredBinlogs。 这个Patch通过修改MySQL Replication中Slave IO线程的实现,让该线程在写入relay log的同时,再Mirror了一份与Master端完全一模一样binlog。这里所说

这几天看了不少Google针对于MySQL开发的google-mysql-tools,找到一个很有意思的Patch:MirroredBinlogs。

这个Patch通过修改MySQL Replication中Slave IO线程的实现,让该线程在写入relay log的同时,再Mirror了一份与Master端完全一模一样binlog。这里所说的一模一样不仅仅是binlog的内容完全一样,同时还包括binlog的文件名。也就是说,该线程在Slave端完全copy了一份Master的binlog日志。

在该 Patch 的描述中,该 Patch 产生的初衷是为了解决Slave与Master之前的顺利切换,并保证切换之后其他Slave仍然能够正常从新的Master继续进行复制。

作者设想了如下一个场景:
在 Hierarchical Replication(级联复制)环境中,第一层是有一台 Master ,第二层是两台 Slaves ,这两台Slave主要作用是作为第三层更多 Slave 的 Master 。也就是,第二层的两台 Slave 的角色在整个集群环境中是一个复制代理。如果我们使用的是普通的MySQL,那么中间代理层的两台Slave之间的binlog日志可能会有较大差异,因为两台Slave自身也会有产生binlog的event。而通过使用该Patch之后,通过 Slave IO 线程将第一层中 Master 的binlog完全一模一样的copy到第二层的 Slave 上面,而使这一层的binlog完全一致。这样,当第二层的两台复制代理机器中的一台Crash之后,可以很容易的将第三层中以 前面 Crash 的 Slave 作为 Master 的所有 Slave 可以很容易的切换 Master 到另外一台 代理 Slave 上面。

只不过,开发者已经停止了该Patch的更新,并将该Patch整合到了一个新的叫 GlobalTransactionIds(MySQL Hierarchical Replication & Global Group IDs)的Patch中,只不过该Patch还正在开发中。从 Google 在 GlobalTransactionIds 的介绍中可以看到比其他 Patch 更为详细的一些说明,不知道是否算是对该 Patch 比较重视的一个表现呢? 希望不是我的一厢情愿吧。

自己目前还没有详细测试过 MirroredBinlogs 这个 Patch,也不知道是否奏效,不过我想 Google 应该不会在技术这种事情上拿自己的名声和我们开这种玩笑吧,哈哈。如果有哪位朋友已经做过相关的测试的话,就 Share 一下效果吧…

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