lianetm commented on code in PR #17653:
URL: https://github.com/apache/kafka/pull/17653#discussion_r1825960281
##########
group-coordinator/src/main/java/org/apache/kafka/coordinator/group/modern/consumer/ConsumerGroup.java:
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@@ -334,6 +342,13 @@ private void removeStaticMember(ConsumerGroupMember
oldMember) {
}
}
+ /**
+ * @return The number of members subscribed to the provided regex.
+ */
+ public int numSubscribedMembers(String regex) {
+ return subscribedRegularExpressions.getOrDefault(regex, 0);
+ }
Review Comment:
That's the main gain as I see it, and it's a critical one, but we can also
leverage this counter in the future when defining the strategies to re-eval all
regular expressions (ie. we could decide to re-eval the "most used" first based
on this subscribers count)
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