January 2018
Beginner to intermediate
234 pages
7h 8m
Chinese
Content preview from Kafka权威指南
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安装
Kafka
｜
29
2.7.2
数据中心布局
在开发阶段，人们并不会太关心
Kafka
服务器在数据中心所处的物理位置，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，服务不可
用意味着金钱的损失，具体表现为无法为用户提供服务或者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（请参考第
6
章），而服务器在数据中
心所处的物理位置也变得重要起来。如果在部署
Kafka
之前没有考虑好这个问题，那么在
后续的维护过程中，移动服务器需要耗费更高的成本。
在为
broker
增加新的分区时，
broker
并无法获知机架的信息。也就是说，两个
broker
有
可能是在同一个机架上，或者在同一个可用区域里（如果运行在像
AWS
这样的的云服务
上），所以，在为分区添加副本的时候，这些副本很可能被分配给同一个机架上的
broker
，
它们使用相同的电源和网络连接。如果该机架出了问题，这些分区就会离线，客户端就无
法访问到它们。更糟糕的是，如果发生不完整的主节点选举，那么在恢复时就有可能丢失
数据（第
6
章将介绍更多细节）。
所以，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）。除了这些以外，最好还要
把
broker
安放在不同的机架上。因为随着时间的推移，机架也需要进行维护，而这会导致
机器离线（比如移动机器或者重新连接电源） ...
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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.