[GitHub] [pulsar] mattisonchao commented on a diff in pull request #15852: [fix][client] `ZeroQueueConsumer` may not increase the permit after unloading the topic.

[GitBox <gi...@apache.org>]

mattisonchao commented on code in PR #15852:
URL: https://github.com/apache/pulsar/pull/15852#discussion_r886403707


##########
pulsar-broker/src/test/java/org/apache/pulsar/client/impl/ZeroQueueSizeTest.java:
##########
@@ -546,4 +548,48 @@ public void testPauseAndResumeNoReconnection() throws Exception {
             assertEquals(receivedMessages.get(i).intValue(), i);
         }
     }
+
+    @Test(timeOut = 30000)
+    public void testReceiveAsyncWhenUnloadTopic() throws PulsarClientException, ExecutionException, InterruptedException, PulsarAdminException {
+        final String topicName = "persistent://prop/cluster/namespace/topic-" + UUID.randomUUID();
+        int messageNumber = 500;
+        List<MessageId> messages = Collections.synchronizedList(new ArrayList<>());
+        @Cleanup
+        Consumer<byte[]> subscribe = pulsarClient.newConsumer()
+                .topic(topicName)
+                .subscriptionName("sub-11")
+                .subscriptionType(SubscriptionType.Shared)
+                .receiverQueueSize(0)
+                .consumerName("con-11")
+                .subscribe();
+
+        @Cleanup
+        Producer<byte[]> producer = pulsarClient.newProducer()
+                .enableBatching(false)
+                .messageRoutingMode(MessageRoutingMode.RoundRobinPartition)
+                .topic(topicName).create();
+        for (int i = 0; i < messageNumber; i++) {
+            MessageId msgId = producer.newMessage()
+                    .value(UUID.randomUUID().toString().getBytes(StandardCharsets.UTF_8))
+                    .send();
+            messages.add(msgId);
+        }
+
+        boolean isUnload = false;
+        do {
+            Message<byte[]> message;
+            try {
+                message = subscribe.receiveAsync().get(5, TimeUnit.SECONDS);
+                if (message != null) {
+                    subscribe.acknowledge(message);
+                    messages.remove(message.getMessageId());
+                }
+            } catch (TimeoutException e) {
+            }
+            if (!isUnload) {
+                admin.topics().unload(topicName);
+                isUnload = true;
+            }
+        } while (messages.size() != 0);

Review Comment:
   Got it!



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