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https://issues.apache.org/jira/browse/KAFKA-2557?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Guozhang Wang resolved KAFKA-2557.
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Resolution: Fixed
> Separate RebalanceInProgress from IllegalGeneration Error Code
> --------------------------------------------------------------
>
> Key: KAFKA-2557
> URL: https://issues.apache.org/jira/browse/KAFKA-2557
> Project: Kafka
> Issue Type: Bug
> Components: clients, consumer
> Reporter: Jiangjie Qin
> Assignee: Onur Karaman
> Fix For: 0.9.0.0
>
>
> The ILLEGAL_GENERATION error is a bit confusing today. When a consumer
> receives an ILLEGAL_GENERATION from hearbeat response, it should still use
> that generation id to commit offset. i.e. the generation id was not really
> illegal.
> The current code was written earlier when we still bump up the generation id
> when the coordinator enters PrepareRebalance state. Since now the generation
> id is bumped up after PreareRebalance state ends, we should not overload
> ILLEGAL_GENERATION to notify a rebalance but create a new error code such as
> REBALANCE_IN_PROGRESS.
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