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Posted to dev@kafka.apache.org by "Jason Gustafson (JIRA)" <ji...@apache.org> on 2016/10/14 21:16:21 UTC
[jira] [Updated] (KAFKA-4303) KafkaConsumer blocks unnecessarily in
commitSync()
[ https://issues.apache.org/jira/browse/KAFKA-4303?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]
Jason Gustafson updated KAFKA-4303:
-----------------------------------
Summary: KafkaConsumer blocks unnecessarily in commitSync() (was: KafkaConsumer hangs indefinitely in commitSync() )
> 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 indefinitely 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 possible previously because the maximum timeout was always bounded by the heartbeat interval.
> 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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