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https://issues.apache.org/jira/browse/KAFKA-2025?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Pradeep G updated KAFKA-2025:
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Priority: Critical (was: Blocker)
> In multi-consumer setup - explicit commit, commits on all partitions
> --------------------------------------------------------------------
>
> Key: KAFKA-2025
> URL: https://issues.apache.org/jira/browse/KAFKA-2025
> Project: Kafka
> Issue Type: Bug
> Components: consumer
> Affects Versions: 0.8.2.0
> Environment: 1. Tested in Windows
> 2. Not tested on Linux
> Reporter: Pradeep G
> Assignee: Neha Narkhede
> Priority: Critical
>
> In a setup where there are two consumers C1 & C2 belonging to consumer group
> CG, two partitions P1 & P2; with auto-commit disabled.
> An explicit commit on ConsumerConnect commits on all the consumers i.e. a
> commit called by C1 commits all messages being processed by other consumers
> too here C2.
> Ideally C1 should be able to commit only those messages it has consumed and
> not what is being processed by C2. The effect of this behavior is that;
> suppose C2 crashes while processing message M after C1 commits, is that
> message M being processed by C2 is not available on recovery and is lost
> forever; and in kafka M is marked as consumed.
> I read that this would be addressed in the rewrite -
> https://cwiki.apache.org/confluence/display/KAFKA/Client+Rewrite#ClientRewrite-ConsumerAPI
> Any thoughts on which release this would be addressed ?. A quick response
> would be greatly appreciated.
> Thanks,
> Pradeep
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