Phuc-Hong-Tran commented on code in PR #14327:
URL: https://github.com/apache/kafka/pull/14327#discussion_r1469332580
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group-coordinator/src/main/java/org/apache/kafka/coordinator/group/GroupMetadataManager.java:
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@@ -1573,6 +1589,33 @@ private void updateGroupsByTopics(
}
});
}
+ if (!oldSubscribedTopicRegex.isEmpty()) {
+ oldSubscribedTopicRegex.forEach(regex -> {
+ groupsByRegex.computeIfPresent(regex, (__, groupIds) -> {
+ groupIds.remove(groupId);
+ return groupIds.isEmpty() ? null : groupIds;
+ });
+ Pattern pattern = Pattern.compile(regex);
+ for (String topicName :
metadataImage.topics().topicsByName().keySet()) {
+ if (pattern.matcher(topicName).matches()) {
+ unsubscribeGroupFromTopic(groupId, topicName);
+ }
+ }
+ });
+ }
+ if (!newSubscribedTopicRegex.isEmpty()) {
+ newSubscribedTopicRegex.forEach(regex -> {
+ groupsByRegex
+ .computeIfAbsent(regex, __ -> new
TimelineHashSet<>(snapshotRegistry, 1))
+ .add(groupId);
+ Pattern pattern = Pattern.compile(regex);
+ for (String topicName :
metadataImage.topics().topicsByName().keySet()) {
+ if (pattern.matcher(topicName).matches()) {
+ subscribeGroupToTopic(groupId, topicName);
+ }
+ }
Review Comment:
Just one question, why is computing the list of topics to subscribe to
expensive here? My guess is that metadataImage is something that we need to
load from disk?
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