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https://issues.apache.org/jira/browse/KAFKA-4303?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Jason Gustafson resolved KAFKA-4303.
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Resolution: Fixed
Issue resolved by pull request 2031
[https://github.com/apache/kafka/pull/2031]
> KafkaConsumer blocks unnecessarily in commitSync()
> ---------------------------------------------------
>
> Key: KAFKA-4303
> URL: https://issues.apache.org/jira/browse/KAFKA-4303
> Project: Kafka
> Issue Type: Bug
> Components: consumer
> Reporter: Jason Gustafson
> Assignee: Jason Gustafson
> Priority: Blocker
> Fix For: 0.10.1.0
>
>
> This appears to be a regression caused by the KIP-62 patch. It is possible
> that we end up blocking unnecessarily in {{NetworkClient.poll()}} with no
> requests pending. The reason is that
> {{ConsumerNetworkClient.poll(RequestFuture)}} does not actually verify that
> the request has been sent prior to calling {{NetworkClient.poll()}}. This was
> not as much of a problem previously because the maximum timeout was always
> bounded by the heartbeat interval, which is typically small.
> This appears to be the cause of hanging builds that some people may have
> experienced. In particular, I have seen {{ConsumerBounceTest}} hang because
> of this problem.
> Note that another reason we can block indefinitely in {{commitSync()}} is
> coordinator discovery. We do not attempt to fix this here.
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