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https://issues.apache.org/jira/browse/KAFKA-16493?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17839096#comment-17839096
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Lianet Magrans commented on KAFKA-16493:
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Hey [~phuctran], any progress on this one? Even though it's a performance
improvement I'm afraid it's a very sensitive one given that it would affect the
poll loop, so we need to make sure it makes it into 3.8 (it had the wrong fix
version before, I just updated it). Let me know if you have any questions.
Thanks!
> Avoid unneeded subscription regex check if metadata version unchanged
> ---------------------------------------------------------------------
>
> Key: KAFKA-16493
> URL: https://issues.apache.org/jira/browse/KAFKA-16493
> Project: Kafka
> Issue Type: Task
> Components: clients, consumer
> Reporter: Lianet Magrans
> Assignee: Phuc Hong Tran
> Priority: Major
> Labels: kip-848-client-support
> Fix For: 4.0.0
>
>
> When using pattern subscription (java pattern), the new consumer regularly
> checks if the list of topics that match the regex has changed. This is done
> as part of the consumer poll loop, and it evaluates the regex using the
> latest cluster metadata. As an improvement, we should avoid evaluating the
> regex if the metadata version hasn't changed (similar to what the legacy
> coordinator does
> [here|https://github.com/apache/kafka/blob/f895ab5145077c5efa10a4a898628d901b01e2c2/clients/src/main/java/org/apache/kafka/clients/consumer/internals/ConsumerCoordinator.java#L435C10-L435C41])
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