October 2021
Beginner to intermediate
250 pages
7h 11m
Chinese
Content preview from 微服务与事件驱动架构
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162
｜
第
12
章
12.5.1
Apache Kafka Streams
Kafka Streams
是一个嵌入到某个应用程序中的功能强大的流处理库，其中输入事件和输出
事件存储在
Kafka
集
群中。它结合了编写和发布标准
JVM
应用程序的简单性，以及利用
与
Kafka
集群深度集成的流处理框架的强大性。
12.5.2
Apache Samza
：
嵌入模式
Samza
提供了许多与
Kafka Streams
一样的特性，虽然在与独立部署相关的某些特性方面它
还有些滞后。
Samza
早于
Kafka
Streams
，它最初的部署模型基于使用重量级集群。直到最
近，
Samza
才发布了一个嵌入模式，这个模式与
Kafka
Streams
的应用程序编写、部署和生
命周期管理模式相似。
就像所有其他的
Java
库一样
，
Samza
的嵌入模式使你可以在单个应用程序中嵌入它的功
能。这个部署模式不需要依赖于专门的重量级集群，而是依赖于前面讨论过的轻量级框架
模型。默认情况下，
Samza
依赖于使用
Apache ZooKeeper
来进行跨单独实例的协调
，但是
可以将其修改为使用其他的协调机制（如
Kubernetes
）。
Apache Samza
的嵌入模式可能不会提供它在集群模式下所拥有的所有功能。
轻量级框架不如重量级框架或用于
BPC
模式的消费者
/
生产者库那样普遍。轻量级框架确
实极度依赖与事件代理的集成，这限制了它们在其他事件代理技术上的可移植性。轻量级
框架领域还相当年轻，但随着
EDM
领域的成熟，它肯定会不断发展壮大。
12.6
语言和语法
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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.