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https://issues.apache.org/jira/browse/KAFKA-19899?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=18040399#comment-18040399
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Anton Vasanth commented on KAFKA-19899:
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Thank you [~dongnuolyu],
Just to clarify - when you say "member regex subscription changes from non
empty to empty", do you mean:
# The member's regex text itself changes from something like "topic.*" to
empty/null (OR)
# The number of members subscribed to a particular regex drops to zero (last
member unsubscribes)
(also case 1 can lead to case 2 right)
> 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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