dajac commented on code in PR #17964:
URL: https://github.com/apache/kafka/pull/17964#discussion_r1862304336


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clients/src/main/java/org/apache/kafka/clients/consumer/internals/ConsumerMetadata.java:
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@@ -68,7 +68,7 @@ public boolean allowAutoTopicCreation() {
 
     @Override
     public synchronized MetadataRequest.Builder newMetadataRequestBuilder() {
-        if (subscription.hasPatternSubscription())
+        if (subscription.hasPatternSubscription() || 
subscription.hasRe2JPatternSubscription())

Review Comment:
   Ouch. It is not supposed to work like this. One of the main benefit of 
moving the regex to the server side is actually to avoid those "request all 
metadata" requests. We should be able to only request the metadata of the 
assigned topic ids regardless of whether the consumer subscribed via names or 
regex. Of course, the local regex resolution requires this. I understand that 
it is a limitation of the current implementation of the subscription because it 
seems that we request based on the subscribed topic names in the subscription 
state. I suppose that it is not possible to change this in this PR. However, we 
should file a jira (if not already done) to refactor the subscription state for 
the new consumer. What do you think?



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