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https://issues.apache.org/jira/browse/KAFKA-19899?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=18040372#comment-18040372
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Dongnuo Lyu commented on KAFKA-19899:
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Hi [~antonvasant], thanks for taking this. I've updated the description with
more context. Feel free to ask more questions if you need clarification.
> Bumping group epoch when member regex subscription changes from non empty to
> empty
> ----------------------------------------------------------------------------------
>
> Key: KAFKA-19899
> URL: https://issues.apache.org/jira/browse/KAFKA-19899
> Project: Kafka
> Issue Type: Bug
> Reporter: Dongnuo Lyu
> Assignee: Anton Vasanth
> Priority: Blocker
> Fix For: 4.2.0
>
>
> In `GroupMetadataManager#maybeUpdateRegularExpressions`,
> `updateRegularExpressionsResult` is set to REGEX_UPDATED if the updated
> member regex subscription is empty and the current member's is not empty,
> which [doesn't trigger a group epoch
> bump|https://github.com/apache/kafka/blob/trunk/group-coordinator/src/main/java/org/apache/kafka/coordinator/group/GroupMetadataManager.java#L2376-L2386]
> later in `consumerGroupHeartbeat`.
> We should fix it by returning REGEX_UPDATED_AND_RESOLVED in this case.
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