michaeljmarshall commented on code in PR #20566:
URL: https://github.com/apache/pulsar/pull/20566#discussion_r1245625640


##########
pulsar-broker/src/main/java/org/apache/pulsar/broker/service/BrokerService.java:
##########
@@ -3304,10 +3305,19 @@ private CompletableFuture<Boolean> 
isAllowAutoTopicCreationAsync(final TopicName
                     topicName.getNamespaceObject());
             return CompletableFuture.completedFuture(false);
         }
-        //System topic can always be created automatically
+
+        // ServiceUnitStateChannelImpl.TOPIC expects to be a 
non-partitioned-topic now.
+        // We don't allow the auto-creation here.
+        // ServiceUnitStateChannelImpl.start() is responsible to create the 
topic.
+        if (ServiceUnitStateChannelImpl.TOPIC.equals(topicName.toString())) {

Review Comment:
   A third option is to only auto create topics as non-partitioned topics. Any 
component that needs to create a system topic as a partitioned topic could do 
so on start up.



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