November 2022
Beginner to intermediate
346 pages
11h
Chinese
Content preview from Kafka权威指南（第2版）
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228
｜
第
12
章
--topics-with-overrides
这个参数只会列出配置参数与集群默认值不同的主题。
--exclude-internal
这是之前提到的参数，它可以将所有名字以双下划线开头的主题排除。
下面的参数可用于找出有问题的分区。
--under-replicated-partitions
这个参数可以找出一个或多个副本与首领不同步的分区。这并不一定是坏事，因为集群
维护、部署和再均衡都会导致分区副本不同步，但还是要注意一下。
--at-min-isr-partitions
这个参数可以找出副本数量（包括首领在内）与配置的最少同步副本（
ISR
）数完全匹
配的分区。这些主题对生产者客户端或消费者客户端来说仍然可用，但已无冗余，有会
变得不可用的风险。
--under-min-isr-partitions
这个参数可以找出
ISR
数低于配置的最小值的分区。这些分区实际上处于只读模式，不
能向其写入数据。
--unavailable-partitions
这个参数可以找出所有没有首领的分区。这种情况很严重，说明分区已离线，对生产者
客户端或消费者客户端来说已经是不可用的。
下面是一个找出具有最少
ISR
数的主题的例子
。在这个例子中，主题的最少
ISR
数为
1
，
复制系数（
RF
）为
2
。主机
0
在线，主机
1
停机维护。
# kafka-topics.sh --bootstrap-server localhost:9092 --describe --at-min-isr-
partitions
Topic: my-topic ...
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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.
I’ve been on the O’Reilly platform for more than eight years. I use a couple of learning platforms, but I'm on O'Reilly more than anybody else. When you're there, you start learning. I'm never disappointed.Amir M.
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.