January 2018
Beginner to intermediate
234 pages
7h 8m
Chinese
Content preview from Kafka权威指南
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98
｜
第
6
章
6.6.1
配置验证
从应用程序里可以很容易对
broker
和客户端配置进行验证，我们之所以建议这么做，有以
下两方面的原因。
•
验证配置是否满足你的需求。
•
帮助你理解系统的行为，了解系统的真正行为是什么，了解你对
Kafka
基本准则的理解
是否存在偏差，然后加以改进，同时了解这些准则是如何被应用到各种场景里的。这一
章的内容偏重理论，所以要确保你能够理解这些理论是如何运用于实际当中的。
Kafka
提供了两个重要的工具用于验证配置：
org.apache.kafka.tools
包里的 Verifiable
Producer 和 VerifiableConsumer 这两个类。我们可以从命令行运行这两个类，或者把它们
嵌入到自动化测试框架里。
其思想是，VerifiableProducer 生成一系列消息，这些消息包含从
1
到你指定的某个数
字。你可以使用与生产者相同的方式来配置 VerifiableProducer，比如配置相同的 acks、
重试次数和消息生成速度。在运行 VerifiableProducer 时，它会把每个消息是否成功发送
到
broker
的结果打印出来。VerifiableConsumer 执行的是另一个检查——它读取事件（由
VerifiableProducer 生成）并按顺序打印出这些事件。它也会打印出已提交的偏移量和再
均衡的相关信息。
你可以考虑运行以下一些测试。
•
首领选举：如果我停掉首领会发生什么事情？生产者和消费者重新恢复正常状态需要多
长时间？
•
控制器选举：重启控制器后系统需要多少时间来恢复状态？ ...
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