Kafka 生产者超时异常

Question

我是运行正在将数据写入 Kafka 主题的 Samza 流作业。 Kafka 是运行一个 3 节点集群。 Samza 作业部署在 yarn 上。我们在容器日志中看到很多这样的异常：

 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.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种异常情况比较多

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是什么。每当它发生时，Samza 容器就会重新启动。

Answer 1

该错误表明某些记录放入队列的速度快于它们从客户端发送的速度。

当您的 Producer 发送消息时，它们存储在缓冲区中（在发送到目标代理之前）并且记录被分组到批中以增加吞吐量。将新记录添加到批次时，必须在可配置的时间 window 内发送，该时间由 request.timeout.ms 控制（默认设置为 30 秒）。如果批处理在队列中的时间较长，则会抛出 TimeoutException，然后批处理记录将从队列中删除，并且不会传递给代理。

增加 request.timeout.ms 的值应该可以解决问题。

如果这不起作用，您也可以尝试减少 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 linger.ms 设置为0（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消息，我认为您的网络出现了问题。您是否启用了 SSL？

Kafka 生产者超时异常

Kafka Producer TimeOutException

apache-kafka

apache-samza

kafka-producer-api