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https://issues.apache.org/jira/browse/KAFKA-3657?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15271007#comment-15271007
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Vamsi Subhash Achanta commented on KAFKA-3657:
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I haven't tested it against 0.9.x branch. This occurs on production
intermittently and we are still on 0.8.2.1
> NewProducer NullPointerException on ProduceRequest
> --------------------------------------------------
>
> Key: KAFKA-3657
> URL: https://issues.apache.org/jira/browse/KAFKA-3657
> Project: Kafka
> Issue Type: Bug
> Components: network, producer
> Affects Versions: 0.8.2.1
> Environment: linux 3.2.0 debian7
> Reporter: Vamsi Subhash Achanta
> Assignee: Jun Rao
>
> The producer upon send.get() on the future appends to the accumulator the
> record batches and the Sender.java (separate thread) flushes it to the
> server. The produce request waits on the countDownLatch in the
> FutureRecordMetadata:
> public RecordMetadata get() throws InterruptedException,
> ExecutionException {
> this.result.await();
> In this case, the client thread is blocked for ever (as it is get() without
> timeout) for the response and the response upon poll by the Sender returns an
> attachment with the batch value as null. The batch is processed and the
> request is errored out. The Sender catches a global level exception and then
> goes ahead. As the accumulator is drained, the response will never be
> returned and the producer client thread calling get() is blocked for ever on
> the latch await call.
> I checked at the server end but still haven't found the reason for null
> batch. Any pointers on this?
> ERROR [2016-05-01 21:00:09,256] [kafka-producer-network-thread |producer-app]
> [Sender] message_id: group_id: : Uncaught error in kafka producer I/O thread:
> ! java.lang.NullPointerException: null
> ! at
> org.apache.kafka.clients.producer.internals.Sender.completeBatch(Sender.java:266)
> ! at
> org.apache.kafka.clients.producer.internals.Sender.handleResponse(Sender.java:236)
> ! at org.apache.kafka.clients.producer.internals.Sender.run(Sender.java:196)
> ! at org.apache.kafka.clients.producer.internals.Sender.run(Sender.java:122)
> ! at java.lang.Thread.run(Thread.java:745)
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