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https://issues.apache.org/jira/browse/KAFKA-2942?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15038335#comment-15038335
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ASF GitHub Bot commented on KAFKA-2942:
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Github user asfgit closed the pull request at:
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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