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https://issues.apache.org/jira/browse/KAFKA-21409?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Sean Quah updated KAFKA-21409:
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Component/s: group-coordinator
> Switching to a subscription regex that matches no topic doesn't trigger
> rebalance
> ---------------------------------------------------------------------------------
>
> Key: KAFKA-21409
> URL: https://issues.apache.org/jira/browse/KAFKA-21409
> Project: Kafka
> Issue Type: Bug
> Components: group-coordinator
> Affects Versions: 4.0.0, 4.0.1, 4.1.0, 4.2.0, 4.3.0, 4.0.2, 4.1.1, 4.1.2,
> 4.2.1, 4.3.1, 4.4.0, 4.2.2, 4.3.2
> Reporter: Chia-Ping Tsai
> Assignee: Jheng-Sing Chen
> Priority: Major
>
>
> {code:java}
> ResolvedRegularExpression newResolvedRegularExpression = entry.getValue();
> ResolvedRegularExpression oldResolvedRegularExpression = group
> .resolvedRegularExpression(regex)
> .orElse(ResolvedRegularExpression.EMPTY);
> if
> (!oldResolvedRegularExpression.topics().equals(newResolvedRegularExpression.topics()))
> {
> {code}
> Since ResolvedRegularExpression.EMPTY has no topics which is equal to
> "match-to-nothing", the condition won't get passed. The side effect is that
> the partitions won't be reassigned to other consumers.
>
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