poorbarcode commented on code in PR #17338:
URL: https://github.com/apache/pulsar/pull/17338#discussion_r960370138


##########
pulsar-broker/src/main/java/org/apache/pulsar/broker/admin/impl/NamespacesBase.java:
##########
@@ -264,13 +265,19 @@ protected void internalDeleteNamespace(AsyncResponse 
asyncResponse, boolean auth
         }
 
         boolean isEmpty;
-        List<String> topics;
+        Set<String> partitionedTopicNames = new HashSet<>();
+        Set<String> topicNames = new HashSet<>();
         try {
-            topics = 
pulsar().getNamespaceService().getListOfPersistentTopics(namespaceName)
-                    .get(config().getMetadataStoreOperationTimeoutSeconds(), 
TimeUnit.SECONDS);
-            topics.addAll(getPartitionedTopicList(TopicDomain.persistent));
-            topics.addAll(getPartitionedTopicList(TopicDomain.non_persistent));
-            isEmpty = topics.isEmpty();
+            if (policies == null || 
CollectionUtils.isEmpty(policies.replication_clusters)){

Review Comment:
   Hi @nodece 
   
   The cause has been identified:
   1. Firstly: creating `non persistent topic` will deny when not set 
replication_clusters.
   2. The namespace created in V1 must manually set the `replicator` policy to 
use `non persistent topic`
   3. The namespace created in V2 will automatically set `replicator` policy
   
   So this code is correct.



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