January 2018
Beginner to intermediate
234 pages
7h 8m
Chinese
Content preview from Kafka权威指南
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132
｜
第
8
章
度量指标监控
MirrorMaker
内嵌了生产者和消费者，它们都有很多可用的度量指标，所以建议对它们
进行监控。
Kafka
文档列出了所有可用的度量指标。下面列出了几个已经被证明能够提
升
MirrorMaker
性能的度量指标。
消费者
fetch-size-avg、fetch-size-max、fetch-rate、fetch-throttle-time-avg 以及
fetch-throttle-time-max
。
生产者
batch-size-avg
、
batch-size-max
、
requests-in-flight
以及
record-retry-rate
。
同时适用于两者
io-ratio 和 io-wait-ratio。
canary
如果对所有东西都进行了监控，那么
canary
就不是必需的，不过对于多层监控来说，
canary
可能还是有必要的。我们可以每分钟往源集群的某个特定主题上发送一个事件，
然后尝试从目标集群读取这个事件。如果这个事件在给定的时间之后才到达，那么就发
出告警，说明
MirrorMaker
出现了延迟或者已经不正常了。
8.3.3
MirrorMaker
调优
MirrorMaker
集群的大小取决于对吞吐量的需求和对延迟的接受程度。如果不允许有任何
延迟，那么
MirrorMaker
集群的容量需要能够支撑吞吐量的上限。如果可以容忍一些延迟，
那么可以在
95%~99%
的时间里只使用
75%~80%
的容量。在吞吐量高峰时可以允许一些
延迟，高峰期结束时，因为
MirrorMaker
有一些空余容量，可以很容易地消除延迟。 ...
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I wanted to learn C and C++, but it didn't click for me until I picked up an O'Reilly book. When I went on the O’Reilly platform, I was astonished to find all the books there, plus live events and sandboxes so you could play around with the technology.Addison B.
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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.