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https://issues.apache.org/jira/browse/KAFKA-19163?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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David Jacot resolved KAFKA-19163.
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Fix Version/s: 4.0.1
4.1.0
Resolution: Fixed
> New group coordinator can incorrectly delete groups with pending
> transactional offsets
> --------------------------------------------------------------------------------------
>
> Key: KAFKA-19163
> URL: https://issues.apache.org/jira/browse/KAFKA-19163
> Project: Kafka
> Issue Type: Bug
> Components: group-coordinator
> Reporter: Sean Quah
> Assignee: Sean Quah
> Priority: Major
> Fix For: 4.0.1, 4.1.0
>
>
> When a group has pending transactional offsets and no committed offsets, the
> group coordinator's periodic cleanup process can delete the group
> prematurely. This is not great if the pending transactional offsets then get
> committed.
> When there are committed offsets to clean up, we check whether there are open
> transactions and avoid deleting the group if any exist.
> https://github.com/apache/kafka/blob/5d2bfb4151700000fc5ec22918ecd3cecb5178a5/group-coordinator/src/main/java/org/apache/kafka/coordinator/group/OffsetMetadataManager.java#L888
> However, we don't do the same check when there are no committed offsets to
> clean up.
> https://github.com/apache/kafka/blob/5d2bfb4151700000fc5ec22918ecd3cecb5178a5/group-coordinator/src/main/java/org/apache/kafka/coordinator/group/OffsetMetadataManager.java#L850-L855
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