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https://issues.apache.org/jira/browse/KAFKA-18729?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17923773#comment-17923773
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Lianet Magrans commented on KAFKA-18729:
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[~m1a2st] more context:

Initial PR discussion here 
[https://github.com/apache/kafka/pull/18777#discussion_r1941488787] 

Good to tackle this one with https://issues.apache.org/jira/browse/KAFKA-18117 
in mind, just to be on the same page about moving towards topicIds (instead of 
topicNames) whenever possible. I'll start working on 18117 soon (right after 
wrapping up 4.0)

> Improve consumer check for assigned topics from regex
> -----------------------------------------------------
>
>                 Key: KAFKA-18729
>                 URL: https://issues.apache.org/jira/browse/KAFKA-18729
>             Project: Kafka
>          Issue Type: Improvement
>          Components: consumer
>            Reporter: Lianet Magrans
>            Assignee: 黃竣陽
>            Priority: Major
>             Fix For: 4.1.0
>
>
> When using subscriptions to broker-side regex RE2J, the consumer checks if a 
> topic received in metadata is assigned in order to keep its info. At the 
> moment, the consumer has no other way but to check the topic against the list 
> of assigned topicPartitions (which is all that's available). 
> We should consider improving the check to do it at the topic level, not 
> topicPartition level . We would need to keep the set of assigned topics from 
> RE2J regex in the subscription state, updated as assignments as reconciled 
> and partitions are add/removed. Then we could rely on this topic set for the 
> check (not all the assigned topicPartitions set)  



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