mattisonchao commented on code in PR #19737:
URL: https://github.com/apache/pulsar/pull/19737#discussion_r1155314101


##########
pulsar-broker/src/main/java/org/apache/pulsar/broker/service/persistent/PersistentTopic.java:
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@@ -429,6 +431,25 @@ public AtomicLong getPendingWriteOps() {
         return pendingWriteOps;
     }
 
+    public CompletableFuture<Void> unloadSubscription(String subName) {
+        final PersistentSubscription sub = subscriptions.get(subName);
+        if (sub == null) {
+            return CompletableFuture.failedFuture(new 
RestException(Response.Status.NOT_FOUND,

Review Comment:
   >It is better to redesign the exception when there is another requirement to 
call this method。
   
   Since Apache Pulsar is an open-source project, suppose you hand over this 
responsibility to the next contributor. The odds are that he will simply use 
this exception. This will create a large amount of technical debt.



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