ojasvajain opened a new pull request, #23696: URL: https://github.com/apache/kafka/pull/23696
**What** KIP-714's client-metrics match config patterns are now validated with RE2/J syntax when a subscription's match value is new or has actually changed. Already-persisted subscriptions continue to accept patterns that only compile under java.util.regex via a deprecated, temporary fallback that logs a warning. The fallback will be removed in Apache Kafka 5.0. **Why** RE2/J guarantees linear-time matching, which matters here because match patterns are evaluated against client-supplied strings. KIP-848 already made this switch for topic subscription regexes (KAFKA-17593). The switch needed care because RE2/J supports only a subset of regexes that java.util.regex supported and we wanted to ensure that existing match patterns compile even if they are not part of that subset. -- This is an automated message from the Apache Git Service. To respond to the message, please log on to GitHub and use the URL above to go to the specific comment. To unsubscribe, e-mail: [email protected] For queries about this service, please contact Infrastructure at: [email protected]
