November 2022
Beginner to intermediate
346 pages
11h
Chinese
Content preview from Kafka权威指南（第2版）
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184
｜
第
10
章
用它在灾备集群中找到最后的检查点偏移量。
Kafka 2.7.0
支持定时迁移消费者偏移量，
它会自动将转换后的偏移量提交到灾备集群的
__consumer_offsets
主题，消费者在切换
到灾备集群后就可以从之前停止的位置重新开始处理数据，不会发生数据丢失，并会将
重复处理消息的可能性降到最低。为安全起见，如果目标集群的消费者正在使用目标消
费者群组，那么
MirrorMaker
就不会覆盖偏移量，从而能够避免出现意外冲突。
主题配置信息和 ACL 的迁移
除了数据，
MirrorMaker
也可以镜像主题的配置信息和访问控制列表
（
ACL
）信息，以
便保留相同的主题行为。这个功能默认是启用的，并会以合理的时间间隔刷新。源主题
的大部分配置参数会被应用于目标主题，但有一些参数在默认情况下不会被应用，比如
min.insync.replicas
。需要排除哪些配置参数可以自行指定。
只有那些与被镜像的主题匹配的字面量
ACL
会
被迁移，因此，如果你使用的是包含前
缀或通配符的
ACL
或
者其他身份验证机制，则需要在目标集群中显式配置。为了确保
只有
MirrorMaker
能够向目标主题写入数据
，
Topic:Write
权限不会被迁移。在发生故
障转移时，必须显式地授予应用程序适当的访问权限，确保它们可以正常访问第二个
集群。
连接器任务
参数
tasks.max
指定了与
MirrorMaker
关联的连接器可以使用的最大任务数。默认值
为
1
，
但建议最少将其设置为
2
。在复制大量的主题分区时，为了增加并行度，应该尽
可能设置更大的值。 ...
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I'm always learning. So when I got on to O'Reilly, I was like a kid in a candy store. There are playlists. There are answers. There's on-demand training. It's worth its weight in gold, in terms of what it allows me to do.