BewareMyPower commented on code in PR #24658:
URL: https://github.com/apache/pulsar/pull/24658#discussion_r2297119840


##########
pulsar-broker/src/main/java/org/apache/pulsar/broker/service/SystemTopicBasedTopicPoliciesService.java:
##########
@@ -419,6 +418,22 @@ public void addOwnedNamespaceBundleAsync(NamespaceBundle 
namespaceBundle) {
                         });
     }
 
+    private CompletableFuture<SystemTopicClient.Reader<PulsarEvent>> 
newReader(NamespaceName ns) {
+        return readerCaches.compute(ns, (__, existingFuture) -> {
+            if (existingFuture == null) {
+                return createSystemTopicClient(ns);
+            }
+
+            if (existingFuture.isCompletedExceptionally()) {
+                if (isAlreadyClosedException(existingFuture)) {

Review Comment:
   This should be applied to line 406 as well
   
   ```
                                           cleanCache(namespace, false,
                                                   
readerCompletableFuture.isCompletedExceptionally());
   ```
   
   Let me submit a patch directly



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