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https://issues.apache.org/jira/browse/KAFKA-18095?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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David Jacot resolved KAFKA-18095.
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Resolution: Fixed
> Consider allowing member to join without subscription under new consumer
> protocol
> ---------------------------------------------------------------------------------
>
> Key: KAFKA-18095
> URL: https://issues.apache.org/jira/browse/KAFKA-18095
> Project: Kafka
> Issue Type: Improvement
> Components: group-coordinator
> Reporter: Lianet Magrans
> Assignee: David Jacot
> Priority: Minor
> Labels: kip-848
> Fix For: 4.0.0
>
>
> With the new consumer group protocol we currently enforce that members must
> provide subscribed topics or a regex when joining the group. This prevents
> members to join in cases where it subscribes to a java pattern for which the
> client-side resolution finds no matching topics.
> If we relax this validation, we would end up with a more consistent behaviour
> for the regex subscriptions under the new protocol, given that currently, if
> the regex is resolved on the broker and finds no matching topics, the member
> is still allowed in the group (with no assignments), but if resolved on the
> client it doesn't join.
> Also, the consumer could continue to guarantee that it joins after
> subscribe(Pattern), no matter if there are matching topics or not.
> If we implement this change on the group coordinator, we also need to update
> the new consumer to actually attempt to join after a call to
> subscribe(Pattern) if no matching topics found (related jira)
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