BewareMyPower commented on code in PR #23049:
URL: https://github.com/apache/pulsar/pull/23049#discussion_r1682320961


##########
pulsar-broker/src/main/java/org/apache/pulsar/broker/namespace/NamespaceService.java:
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@@ -1509,6 +1514,31 @@ public CompletableFuture<List<String>> 
getListOfTopics(NamespaceName namespaceNa
         }
     }
 
+    public CompletableFuture<List<String>> getListOfUserTopics(NamespaceName 
namespaceName, Mode mode) {
+        String key = String.format("%s://%s", mode, namespaceName);
+        CompletableFuture<List<String>> queryRes =
+                inProgressQueryUserTopics.computeIfAbsent(key, k -> {
+            CompletableFuture<List<String>> res = new CompletableFuture<>();
+            // Switch thread to avoid blocking other threads who are calling 
the current method.
+            pulsar.getExecutor().execute(() -> {
+                getListOfTopics(namespaceName, mode).thenApply(list -> {
+                    return TopicList.filterSystemTopic(list);
+                }).whenComplete((topics, ex) -> {
+                    if (ex != null) {
+                        res.completeExceptionally(ex);
+                    } else {
+                        res.complete(topics);
+                    }
+                });
+            });
+            return res;
+        });
+        queryRes.whenComplete((ignore, ex) -> {

Review Comment:
   Checking if it's inserted does not change the fact that all concurrent `run` 
calls return the same future



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