nodece commented on code in PR #23624:
URL: https://github.com/apache/pulsar/pull/23624#discussion_r1851672875


##########
pulsar-broker/src/test/java/org/apache/pulsar/client/impl/AutoScaledReceiverQueueSizeTest.java:
##########
@@ -257,4 +266,61 @@ public void testMultiConsumerImplBatchReceive() throws 
PulsarClientException, Pu
         Awaitility.await().until(() -> consumer.getCurrentReceiverQueueSize() 
== currentSize * 2);
         log.info("getCurrentReceiverQueueSize={}", 
consumer.getCurrentReceiverQueueSize());
     }
+
+    @Test
+    public void testNegativeClientMemory() throws Exception {
+        final String topicName = "persistent://public/default/testMemory-" +
+                UUID.randomUUID().toString();
+        final String subName = "my-sub";
+
+        admin.topics().createPartitionedTopic(topicName, 3);
+
+        @Cleanup
+        Producer<byte[]> producer = pulsarClient.newProducer()
+                .topic(topicName)
+                .enableBatching(false)
+                .create();
+
+        final int messages = 1000;
+        List<CompletableFuture<MessageId>> messageIds = new 
ArrayList<>(messages);
+        for (int i = 0; i < messages; i++) {
+            messageIds.add(producer.newMessage().key(i + "").value(("Message-" 
+ i).getBytes()).sendAsync());
+        }
+        FutureUtil.waitForAll(messageIds).get();
+
+
+        @Cleanup
+        Consumer<byte[]> consumer = pulsarClient.newConsumer()
+                .topic(topicName)
+                .subscriptionName(subName)
+                
.subscriptionInitialPosition(SubscriptionInitialPosition.Earliest)
+                .autoScaledReceiverQueueSizeEnabled(true)
+                .subscribe();
+
+        Field field = 
PulsarClientImpl.class.getDeclaredField("memoryLimitController");
+        field.setAccessible(true);
+        MemoryLimitController controller = (MemoryLimitController) 
field.get(pulsarClient);

Review Comment:
   ```suggestion
           MemoryLimitController controller = ((PulsarClientImpl) 
pulsarClient).getMemoryLimitController();
   ```



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