January 2018
Beginner to intermediate
234 pages
7h 8m
Chinese
Content preview from Kafka权威指南
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可靠的数据传递
｜
99
下的故障条件做一些测试：
•
客户端从服务器断开连接（系统管理员可以帮忙模拟网络故障）；
•
首领选举；
•
依次重启
broker
；
•
依次重启消费者；
•
依次重启生产者。
你对每一个测试场景都会有
期望的行为
，也就是在开发应用程序时所期望看到的行为，然
后运行测试看看真实的结果是否符合预期。例如，在测试“依次重启消费者”这一场景
时，你期望看到“在短暂的再均衡之后出现的重复消息个数不超过
1000
个”。测试结果会
告诉我们应用程序提交偏移量的方式和处理再均衡的方式是否与预期的一样。
6.6.3
在生产环境监控可靠性
测试应用程序是很重要的，不过它无法代替生产环境的持续监控，这些监控是为了确保数
据按照期望的方式流动。我们将会在第
9
章详细介绍如何监控
Kafka
集群，不过除了监控
集群的健康状况之外，监控客户端和数据流也是很重要的。
首先，
Kafka
的
Java
客户端包含了
JMX
度量指标，这些指标可以用于监控客户端的状态
和事件。对于生产者来说，最重要的两个可靠性指标是消息的
error-rate
和
retry-rate
（聚
合过的）。如果这两个指标上升，说明系统出现了问题。除此以外，还要监控生产者日
志——发送消息的错误日志被设为
WARN
级别，可以在“
Got error produce response with
correlation id 5689 on topic-partition [topic-1,3], retrying (two attempts left). Error: ... ...
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