Joker-5 opened a new pull request, #19632:
URL: https://github.com/apache/kafka/pull/19632

   In https://github.com/apache/kafka/pull/15968/files, we changed the 
authorization logic slightly. If a produce request includes a topic name that 
doesn't exist and is not authorized, it now returns an 
UNKNOWN_TOPIC_OR_PARTITION error. Since topic name is sensitive information, it 
should return a TOPIC_AUTHORIZATION_FAILED error as before that PR.
   
           else if (!metadataCache.contains(topicPartition))
             nonExistingTopicResponses += new TopicIdPartition(topicId, 
topicPartition) -> new PartitionResponse(Errors.UNKNOWN_TOPIC_OR_PARTITION)
   


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