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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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Onur Karaman updated KAFKA-2557:
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Summary: Separate RebalanceInProgress from IllegalGeneration Error Code
(was: Separate RebalanceNeededException from IllegalGenerationIdException)
> 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
>
> The IllegalGenerationIdException is a bit confusing today. When a consumer
> receives an IllegalGenerationIdException 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
> IllegalGenerationIdException to notify a rebalance but create a new error
> code such as RebalanceNeededException.
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