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我正在运行将数据写入 Kafka 主题的 Samza 流作业。Kafka 正在运行一个 3 节点集群。Samza 作业部署在纱线上。我们在容器日志中看到了很多这样的异常：

 INFO [2018-10-16 11:14:19,410] [U:2,151,F:455,T:2,606,M:2,658] samza.container.ContainerHeartbeatMonitor:[ContainerHeartbeatMonitor:stop:61] - [main] - Stopping ContainerHeartbeatMonitor
ERROR [2018-10-16 11:14:19,410] [U:2,151,F:455,T:2,606,M:2,658] samza.runtime.LocalContainerRunner:[LocalContainerRunner:run:107] - [main] - Container stopped with Exception. Exiting process now.
org.apache.samza.SamzaException: org.apache.samza.SamzaException: Unable to send message from TaskName-Partition 15 to system kafka.
        at org.apache.samza.task.AsyncRunLoop.run(AsyncRunLoop.java:147)
        at org.apache.samza.container.SamzaContainer.run(SamzaContainer.scala:694)
        at org.apache.samza.runtime.LocalContainerRunner.run(LocalContainerRunner.java:104)
        at org.apache.samza.runtime.LocalContainerRunner.main(LocalContainerRunner.java:149)
Caused by: org.apache.samza.SamzaException: Unable to send message from TaskName-Partition 15 to system kafka.
        at org.apache.samza.system.kafka.KafkaSystemProducer$$anon$1.onCompletion(KafkaSystemProducer.scala:181)
        at org.apache.kafka.clients.producer.internals.RecordBatch.done(RecordBatch.java:109)
        at org.apache.kafka.clients.producer.internals.RecordBatch.maybeExpire(RecordBatch.java:160)
        at org.apache.kafka.clients.producer.internals.RecordAccumulator.abortExpiredBatches(RecordAccumulator.java:245)
        at org.apache.kafka.clients.producer.internals.Sender.run(Sender.java:212)
        at org.apache.kafka.clients.producer.internals.Sender.run(Sender.java:135)
        at java.lang.Thread.run(Thread.java:748)
Caused by: org.apache.kafka.common.errors.TimeoutException: Expiring 5 record(s) for Topic3-16 due to 30332 ms has passed since last attempt plus backoff time

这 3 种类型的异常来了很多。

59088 org.apache.kafka.common.errors.TimeoutException: Expiring 115 record(s) for Topic3-1 due to 30028 ms has passed since last attempt plus backoff time

61015 org.apache.kafka.common.errors.TimeoutException: Expiring 60 record(s) for Topic3-1 due to 74949 ms has passed since batch creation plus linger time

62275 org.apache.kafka.common.errors.TimeoutException: Expiring 176 record(s) for Topic3-4 due to 74917 ms has passed since last append

请帮助我了解这里的问题。每当它发生时，Samza 容器就会重新启动。

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1 回答 1

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该错误表明某些记录以比从客户端发送的速度更快的速度放入队列。

当您的生产者发送消息时，它们被存储在缓冲区中（在发送到目标代理之前），并且记录被分组到一起以增加吞吐量。将新记录添加到批次时，它必须在一个可配置的时间窗口内发送，该窗口由request.timeout.ms（默认设置为 30 秒）控制。如果批次在队列中的时间更长，TimeoutException则抛出 a 并且批次记录将从队列中删除并且不会传递给代理。

增加 的值request.timeout.ms应该可以为您解决问题。

如果这不起作用，您还可以尝试减少batch.size，以便更频繁地发送批次（但这次将包含更少的消息）并确保将linger.ms其设置为 0（这是默认值）。

请注意，您需要在更改任何配置参数后重新启动您的 kafka 代理。

如果您仍然收到错误，我认为您的网络出现问题。您是否启用了 SSL？

于 2018-11-09T10:36:04.910 回答