Demogorgon314 commented on a change in pull request #11355:
URL: https://github.com/apache/pulsar/pull/11355#discussion_r672726190



##########
File path: 
pulsar-broker/src/main/java/org/apache/pulsar/broker/admin/impl/PersistentTopicsBase.java
##########
@@ -1030,34 +1032,52 @@ protected void internalGetSubscriptions(AsyncResponse 
asyncResponse, boolean aut
                     false).thenAccept(partitionMetadata -> {
                 if (partitionMetadata.partitions > 0) {
                     try {
-                        // get the subscriptions only from the 1st partition
-                        // since all the other partitions will have the same
-                        // subscriptions
-                        
pulsar().getAdminClient().topics().getSubscriptionsAsync(topicName.getPartition(0).toString())
-                                .whenComplete((r, ex) -> {
-                                    if (ex != null) {
-                                        log.warn("[{}] Failed to get list of 
subscriptions for {}: {}", clientAppId(),
-                                                topicName, ex.getMessage());
-
-                                        if (ex instanceof 
PulsarAdminException) {
-                                            PulsarAdminException pae = 
(PulsarAdminException) ex;
-                                            if (pae.getStatusCode() == 
Status.NOT_FOUND.getStatusCode()) {
-                                                asyncResponse.resume(new 
RestException(Status.NOT_FOUND,
-                                                        "Internal topics have 
not been generated yet"));
-                                                return;
-                                            } else {
-                                                asyncResponse.resume(new 
RestException(pae));
-                                                return;
-                                            }
-                                        } else {
-                                            asyncResponse.resume(new 
RestException(ex));
-                                            return;
-                                        }
+                        final Set<String> subscriptions = 
Sets.newConcurrentHashSet();
+                        final List<CompletableFuture<Object>> 
subscriptionFutures = Lists.newArrayList();
+                        if (topicName.getDomain() == TopicDomain.persistent) {
+                            String path = 
String.format("/managed-ledgers/%s/%s", namespaceName.toString(), domain());
+                            List<String> children = 
getLocalPolicies().getChildren(path);

Review comment:
       > > I have a small suggestion, it is use getTopicReference to get 
subscribers directly Instead of use adminClient, this can reduce RPC calls.
   > 
   > Not all partitions owned by the requested broker.
   
   Oh, Thanks for correcting, my mistake, forget it. 




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