January 2018
Beginner to intermediate
234 pages
7h 8m
Chinese
Content preview from Kafka权威指南
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监控
Kafka
｜
181
在读取多个主题时，消费者客户端所提供的主题实例的度量指标会很有用。如果只是读
取单个主题，那么这些指标就与
Fetch Manager
的指标一样，没有必要去收集它们。但
如果客户端读取了大量的主题，比如
MirrorMaker
，那么查看这些指标就会变得很困难。
如果打算收集这些指标，可以考虑收集最重要的
3
个：
bytes-consumed-rate、records-
consumed-rate 和 fetch-size-avg。bytes-consumed-rate 表示从某个主题上每秒读取的消
息字节数，records-consumed-rate 表示每秒读取的消息个数，fetch-size-avg 表示每个请
求的消息平均字节数。
3. Coordinator
度量指标
正如第
4
章所述，消费者客户端以群组的方式运行。群组里会发生一些需要协调的活动，
比如新成员的加入或者向
broker
发送心跳来保持群组的成员关系。消费者协调器负责处理
这些协调工作，作为消费者客户端的组成部分，它也维护着自己的一组度量指标。与其他
度量指标一样，
Coordinator
度量指标也提供了很多数字，但是其中只有关键的一小部分需
要进行常规的监控。
消费者群组在进行同步时，可能会造成消费者的停顿。当群组里的消费者在协商哪些分区
应该由哪些消费者来读取时，就会发生这种情况。停顿的时间长短取决于分区的数量。协
调器提供了 sync-time-avg 属性，用于表示同步活动所使用的平均毫秒数。sync-rate 属性 ...
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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.