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https://issues.apache.org/jira/browse/KAFKA-21117?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Edmond Abraham reassigned KAFKA-21117:
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Assignee: Edmond Abraham
> Soften validation for consumer group creation
> ---------------------------------------------
>
> Key: KAFKA-21117
> URL: https://issues.apache.org/jira/browse/KAFKA-21117
> Project: Kafka
> Issue Type: Bug
> Components: group-coordinator
> Reporter: Izzy Harker
> Assignee: Edmond Abraham
> Priority: Major
>
> It is possible for the group coordinator to fail loading when (a) the load is
> occurring concurrent with compaction and (b) there is a group downgrading
> online from consumer -> classic. We should soften the validation or update
> the classic group check to avoid this.
> This check exists for streams groups as well but is not reproducible at this
> time because it only occurs with an online downgrade.
> Related issue for upgrade/downgrade validation:
> https://issues.apache.org/jira/browse/KAFKA-21102
> e.g.
> load consumer group
> compaction removes consumer group records, including deletion
> load classic group <- fails with
> {{java.lang.IllegalStateException: Group <group-id> is not a consumer group}}
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