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https://issues.apache.org/jira/browse/KAFKA-21102?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Izzy Harker reassigned KAFKA-21102:
-----------------------------------
Assignee: (was: Izzy Harker)
> Soften the validation for group upgrade and downgrade paths
> -----------------------------------------------------------
>
> Key: KAFKA-21102
> URL: https://issues.apache.org/jira/browse/KAFKA-21102
> Project: Kafka
> Issue Type: Bug
> Components: group-coordinator
> Reporter: Izzy Harker
> Priority: Major
>
> For upgrades and downgrades to/from consumer groups and streams groups, the
> old group is deleted then a new group of the desired type
> (classic/consumer/streams) is created. Currently on replay, the group
> deletion fails loading and throws IllegalStateException when the
> TargetAssignmentMetadata tombstone is missing, which can happen if the group
> coordinator loads concurrent with a late compaction run.
> Therefore, we should soften the validation on the upgrade/downgrade path to
> avoid this.
> Similar updates have been made for tombstone/replay validation - see
> https://issues.apache.org/jira/browse/KAFKA-17306
>
> e.g.
> we can load record for streams group A
> then streams group A is downgraded offline to classic group and compaction
> removes group delete for streams group A
> then load record for streams group tombstone -> loading fails with an
> exception like
> {{ERROR: java.lang.IllegalStateException: Received a tombstone record to
> delete group <id> but did not receive
> StreamsGroupTargetAssignmentMetadataValue tombstone. at
> GroupMetadataManager.replay(GroupMetadataManager.java:6264)}}
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