November 2022
Beginner to intermediate
346 pages
11h
Chinese
Content preview from Kafka权威指南（第2版）
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85
第 5 章
编程式管理
Kafka
虽然现在已经有很多基于命令行或图形界面的
Kafka
管理工具（第
9
章将介绍它们），但
有时候你可能想直接在客户端应用程序中执行一些管理命令。基于用户的输入或数据创建
新主题就是一个非常常见的场景：物联网应用程序从用户设备接收事件，并根据设备类型
将事件写入不同的主题。如果制造商生产了一种新设备，那么你要么为其手动创建一个新
主题，要么让应用程序在接收到包含未识别类型设备的事件时动态创建一个新主题。虽然
后一种方式有缺点，但在一些应用场景中，不依赖于额外的处理过程来生成主题是一种很
有吸引力的解决方案。
Kafka
在
0.1
1
版本中加入了
AdminClient
，为之前只能通过命令行完成的管理功能提供了编
程
API
：查看、创建和删除主题，描述集群，管理
ACL
和修改配置。
假设你的应用程序要为某个主题生成事件，在生成第一个事件之前，这个主题必须存在。
在
Kafka
加入
AdminClient
之前
，我们只有很少的选择，并且没有一个是特别友好的：可
以捕获
producer.send()
方法的
UNKNOWN_TOPIC_OR_PARTITION
异常，让用户知道需要先创
建主题，或者寄希望于
Kafka
集
群启用了自动创建主题功能，或者依赖
Kafka
的内部
API
并接受没有兼容性保证的后果。现在，
Kafka
提供了
AdminClient
，我们就有了一种更好的
解决方案：用
AdminClient
检查主题是否存在，如果不存在，就当场创建。
本章将先对
AdminClient
进
行概览，然后再深入探讨如何在应用程序中使用它。我们将重 ...
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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.