[jira] [Updated] (KAFKA-19899) Bumping group epoch when member regex subscription changes from non empty to empty

["David Jacot (Jira)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/KAFKA-19899?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

David Jacot updated KAFKA-19899:
--------------------------------
    Fix Version/s: 4.1.2

> 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, 4.1.2
>
>
> 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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