Lianet Magrans created KAFKA-16493:
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Summary: 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
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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