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https://issues.apache.org/jira/browse/KAFKA-19899?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=18040792#comment-18040792
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David Jacot commented on KAFKA-19899:
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Hi [~antonvasant]. Thanks for picking this one up. Is the issue clear to you?
This is something that I would like to get into the 4.2 release so we must
merge it before Dec 10th. Do you have the bandwidth for it?
> 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
> text|https://github.com/apache/kafka/blob/trunk/group-coordinator/src/main/java/org/apache/kafka/coordinator/group/modern/consumer/ConsumerGroupMember.java#L64]
> 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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