dongnuo123 commented on code in PR #18989:
URL: https://github.com/apache/kafka/pull/18989#discussion_r1968009698


##########
core/src/main/scala/kafka/server/BrokerServer.scala:
##########
@@ -645,6 +645,7 @@ class BrokerServer(
         .withGroupCoordinatorMetrics(new 
GroupCoordinatorMetrics(KafkaYammerMetrics.defaultRegistry, metrics))
         .withGroupConfigManager(groupConfigManager)
         .withPersister(persister)
+        .withAuthorizer(authorizer.toJava)

Review Comment:
   > if we could instead ask the coordinator first for list of topics to filter 
out for regex
   
   With the current implementation, the challenge with this is that the 
resolution and filtering of the regex are done in an async fashion. 
`consumerGroupHeartbeat` will return before we finish resolving the list of 
topics to filter which is done in a separate thread in the coordinator. 
   
   But it does make sense that it's a bit strange carrying the authorizer to 
the coordinator. I think we can work on it as a followup improvement.



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