mattisonchao commented on code in PR #19737:
URL: https://github.com/apache/pulsar/pull/19737#discussion_r1155310749


##########
pulsar-broker/src/main/java/org/apache/pulsar/broker/service/persistent/PersistentTopic.java:
##########
@@ -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,
+                    String.format("Subscription %s not found", subName)));
+        }
+        if (Compactor.COMPACTION_SUBSCRIPTION.equals(sub.getName())){
+            return CompletableFuture.failedFuture(new 
RestException(Response.Status.BAD_REQUEST,
+                    "Could not reload the compaction subscription"));
+        }
+        // Fence old subscription -> Rewind cursor -> Replace with a new 
subscription.
+        return sub.disconnect().thenAccept(ignore -> {
+            sub.getCursor().rewind();

Review Comment:
   Therefore, is calling this behaviour "rewind cursor" more suitable?



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