st0ckface opened a new issue #6552: Cant ack messages on exclusive subscriptions with partioned topic URL: https://github.com/apache/pulsar/issues/6552 **Describe the bug** When creating a consumer with an exclusive subscription, acked messages are not reflected in broker stats. **To Reproduce** Steps to reproduce the behavior: 1. Create a consumer with an exclusive subscription to a partitioned topic 2. Ack each message individually as they are received 3. Notice that "unackedMessages" continually climbs in the `topic stats` via the admin client ```java static PulsarClient getJPulsarClient() throws Exception{ return PulsarClient.builder() .serviceUrl("pulsar://localhost:6650") .connectionsPerBroker(20) .ioThreads(8) .listenerThreads(8) .build(); } static Consumer<byte[]> getJPulsarConsumer(PulsarClient client, String topic, String subscription) throws Exception { return client.newConsumer(Schema.BYTES) .subscriptionName(subscription) .subscriptionType(SubscriptionType.Exclusive) .topic(topic) .consumerName("ackTestConsumer") .subscribe(); } public static void main(String... args) throws Exception{ PulsarClient client = getJPulsarClient(); String topic = "public/default/870|EXTERNID_NG|2020-03-17"; String subscription = "ackTestSubscription" Consumer<byte[]> consumer = getJPulsarConsumer(client, topic, subscription); int maxMessages = 1000000; List<CompletableFuture<Object>> futures = new ArrayList<>(); for(int i = 0; i < maxMessages; i ++){ futures.add(consumer.receiveAsync().thenApplyAsync(m -> { try { consumer.acknowledge(m.getMessageId()); } catch (PulsarClientException e) { e.printStackTrace(); } return null; })); } CompletableFuture.allOf(futures.toArray(new CompletableFuture[futures.size()])).get(); } ``` **Expected behavior** The "unackedMessages" metric should _at most_ hover at or around the receiveQueueSize if not 0. The backlog should also be descreasing **Screenshots** If applicable, add screenshots to help explain your problem.    **Desktop (please complete the following information):** - OS: N/A **Additional context** If the subscription is changed to Shared, the topicStats produce the expected behavior (showing messages acked)
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