Izzy Harker created KAFKA-21102:
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Summary: 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
Assignee: Izzy Harker
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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