[KAFKA-18096] Allow new consumer to join group after subscribe to pattern if no matching topics

• Type: Improvement
• Status: Resolved
• Priority: Minor
• Resolution: Fixed
• Fix Version/s: 4.0.0
• Component/s: clients, consumer
• Labels: kip-848-client-support
• Assignee: Lianet Magrans
• Reporter: Lianet Magrans
• Created: 26/Nov/24 15:02
• Updated: 04/Dec/24 16:36
• Resolved: 04/Dec/24 16:36

Description

Currently the new consumer won't transition to joining after a call to subscribe with Pattern if there are no matching topics. This was because the coordinator does not allow to join without topics (or regex). If that validation is removed from the broker with KAFKA-18095, we should update the consumer so that it attempts to join in that case.

 

This should allow to enable this test for the new consumer https://github.com/apache/kafka/blob/866d66229da658a5eb1fcb9da28624dd8d2f3e2a/core/src/test/scala/integration/kafka/api/AuthorizerIntegrationTest.scala#L1053

Issue Links

• requires: KAFKA-18095 Consider allowing member to join without subscription under new consumer protocol
• links to: GitHub Pull Request #18024