November 2022
Beginner to intermediate
346 pages
11h
Chinese
Content preview from Kafka权威指南（第2版）
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32
｜
第
2
章
2.7.2
数据中心布局
在开发和测试环境中，人们并不太关心
Kafka
服务器在数据中心的物理位置，因为即使集
群在短时间内出现局部或完全不可用，也不会造成太大影响。但是，在生产环境中，服务
不可用就意味着金钱的损失，具体表现为无法为用户提供服务或不知道用户正在做什么。
这个时候，使用
Kafka
集群的复制功能就变得尤为重要
（参见第
7
章），而服务器在数据
中心的物理位置随之也变得重要起来。数据中心最好要有故障区域。如果在部署
Kafka
之
前没有考虑好这个问题，那么以后就需要耗费更高的成本来移动服务器。
Kafka
可以将新创建的分区分配给部署在不同机架上的
broker
（机架感知）
，确保单个分区
的副本不会都位于同一个机架。要做到这一点，必须正确配置每个
broker
的
broker.rack
参数。云环境中的故障区域也可以进行同样的配置。不过，这只适用于新创建的分区。
Kafka
集群不会监控哪些已有的分区不再有机架感知
（例如，由于分区重分配导致的），也
不会进行自动纠正。所以，建议使用集群均衡工具来保持分区的机架感知，比如
Cruise
Control
（参见附录
B
）
。恰当配置这个属性有助于确保持续的机架感知。
总的来说，最好把集群的
broker
安
装在不同的机架上，至少不要让它们共享可能出现单点
故障的基础设施，比如电源和网络。也就是说，部署服务器需要至少两个电源连接（两个
不同的回路）和两个网络交换器（保证可以进行无缝的故障切换）。除了使用两个电源连
接，最好把
broker
安装在不同的机架上
，因为随着时间的推移，机架也需要维护，这个时 ...
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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.