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https://issues.apache.org/jira/browse/KAFKA-2596?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Guozhang Wang resolved KAFKA-2596.
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Resolution: Fixed
Fix Version/s: 0.9.0.0
Issue resolved by pull request 267
[https://github.com/apache/kafka/pull/267]
> Coordinator should return illegal generation for commits from unknown groups
> with non-negative generation
> ---------------------------------------------------------------------------------------------------------
>
> Key: KAFKA-2596
> URL: https://issues.apache.org/jira/browse/KAFKA-2596
> Project: Kafka
> Issue Type: Bug
> Affects Versions: 0.9.0.0
> Reporter: Jason Gustafson
> Assignee: Jason Gustafson
> Fix For: 0.9.0.0
>
>
> Currently the consumer coordinator accepts offset commits blindly if it has
> no state stored for the associated groupId. This means that upon coordinator
> failover, offset commits from any member of a group will be accepted, even if
> that member is from an older generation. A better way of handling this case
> would be to return an ILLEGAL_GENERATION error when the generation in the
> commit request is greater than or equal to 0. Consumers that are not using
> group management will always send a generation of -1, so their commits will
> still be accepted as valid.
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