[jira] [Resolved] (KAFKA-2942) Inadvertent auto-commit when pre-fetching can cause message loss

["Guozhang Wang (JIRA)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/KAFKA-2942?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Guozhang Wang resolved KAFKA-2942.
----------------------------------
       Resolution: Fixed
    Fix Version/s: 0.9.0.1

Issue resolved by pull request 623
[https://github.com/apache/kafka/pull/623]

> Inadvertent auto-commit when pre-fetching can cause message loss
> ----------------------------------------------------------------
>
>                 Key: KAFKA-2942
>                 URL: https://issues.apache.org/jira/browse/KAFKA-2942
>             Project: Kafka
>          Issue Type: Bug
>            Reporter: Jason Gustafson
>            Assignee: Jason Gustafson
>             Fix For: 0.9.0.1
>
>
> Before returning from KafkaConsumer.poll(), we update the consumed position and invoke poll(0) to send new fetches. In doing so, it is possible that an auto-commit is triggered which would commit the updated offsets which hasn't yet been returned. If the process then crashes before consuming the messages, there would be a gap in the delivery.



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