January 2018
Beginner to intermediate
234 pages
7h 8m
Chinese
Content preview from Kafka权威指南
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第 3 章
Kafka
生产者——向
Kafka
写入数据
不管是把
Kafka
作为消息队列、消息总线还是数据存储平台来使用，总是需要有一个可以
往
Kafka
写入数据的生产者和一个可以从
Kafka
读取数据的消费者，或者一个兼具两种角
色的应用程序。
例如，在一个信用卡事务处理系统里，有一个客户端应用程序，它可能是一个在线商店，
每当有支付行为发生时，它负责把事务发送到
Kafka
上。另一个应用程序根据规则引擎检
查这个事务，决定是批准还是拒绝。批准或拒绝的响应消息被写回
Kafka
，然后发送给发
起事务的在线商店。第三个应用程序从
Kafka
上读取事务和审核状态，把它们保存到数据
库，随后分析师可以对这些结果进行分析，或许还能借此改进规则引擎。
开发者们可以使用
Kafka
内置的客户端
API
开发
Kafka
应用程序。
在这一章，我们将从
Kafka
生产者的设计和组件讲起，学习如何使用
Kafka
生产者。我们
将演示如何创建
KafkaProducer
和
ProducerRecords
对象、如何将记录发送给
Kafka
，以及
如何处理从
Kafka
返回的错误，然后介绍用于控制生产者行为的重要配置选项，最后深入
探讨如何使用不同的分区方法和序列化器，以及如何自定义序列化器和分区器。
在第
4
章，我们将会介绍
Kafka
的消费者客户端，以及如何从
Kafka
读取消息。
第三方客户端
除了内置的客户端外，
Kafka
还提供了二进制连接协议，也就是说，我们直
接向
Kafka
网络端口发送适当的字节序列，就可以实现从
Kafka
读取消息或
往
Kafka
写入消息。还有很多用其他语言实现的 ...
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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.