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https://issues.apache.org/jira/browse/KAFKA-4669?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15901075#comment-15901075
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Edoardo Comar commented on KAFKA-4669:
--------------------------------------
The NPE moved from broker1 to another broker when the former was restarted.
This suggest to me it's caused by a 'special' client
> KafkaProducer.flush hangs when NetworkClient.handleCompletedReceives throws
> exception
> -------------------------------------------------------------------------------------
>
> Key: KAFKA-4669
> URL: https://issues.apache.org/jira/browse/KAFKA-4669
> Project: Kafka
> Issue Type: Bug
> Components: clients
> Affects Versions: 0.9.0.1
> Reporter: Cheng Ju
> Priority: Critical
> Labels: reliability
> Fix For: 0.11.0.0
>
>
> There is no try catch in NetworkClient.handleCompletedReceives. If an
> exception is thrown after inFlightRequests.completeNext(source), then the
> corresponding RecordBatch's done will never get called, and
> KafkaProducer.flush will hang on this RecordBatch.
> I've checked 0.10 code and think this bug does exist in 0.10 versions.
> A real case. First a correlateId not match exception happens:
> 13 Jan 2017 17:08:24,059 ERROR [kafka-producer-network-thread | producer-21]
> (org.apache.kafka.clients.producer.internals.Sender.run:130) - Uncaught
> error in kafka producer I/O thread:
> java.lang.IllegalStateException: Correlation id for response (703766) does
> not match request (703764)
> at
> org.apache.kafka.clients.NetworkClient.correlate(NetworkClient.java:477)
> at
> org.apache.kafka.clients.NetworkClient.handleCompletedReceives(NetworkClient.java:440)
> at org.apache.kafka.clients.NetworkClient.poll(NetworkClient.java:265)
> at
> org.apache.kafka.clients.producer.internals.Sender.run(Sender.java:216)
> at
> org.apache.kafka.clients.producer.internals.Sender.run(Sender.java:128)
> at java.lang.Thread.run(Thread.java:745)
> Then jstack shows the thread is hanging on:
> at java.util.concurrent.CountDownLatch.await(CountDownLatch.java:231)
> at
> org.apache.kafka.clients.producer.internals.ProduceRequestResult.await(ProduceRequestResult.java:57)
> at
> org.apache.kafka.clients.producer.internals.RecordAccumulator.awaitFlushCompletion(RecordAccumulator.java:425)
> at
> org.apache.kafka.clients.producer.KafkaProducer.flush(KafkaProducer.java:544)
> at org.apache.flume.sink.kafka.KafkaSink.process(KafkaSink.java:224)
> at
> org.apache.flume.sink.DefaultSinkProcessor.process(DefaultSinkProcessor.java:67)
> at org.apache.flume.SinkRunner$PollingRunner.run(SinkRunner.java:145)
> at java.lang.Thread.run(Thread.java:745)
> client code
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