merlimat commented on issue #2221: Getting UnAckedMessageTracker messages have timed-out without a reason URL: https://github.com/apache/incubator-pulsar/issues/2221#issuecomment-407549937 @IdanFridman Got to reproduce it with this simple code: ```java PulsarClient client = PulsarClient.builder() .serviceUrl("pulsar://localhost:6650") .build(); Consumer<byte[]> consumer = client.newConsumer() .topic("my-topic") .subscriptionName("test") .subscriptionType(SubscriptionType.Shared) .ackTimeout(3, TimeUnit.SECONDS) .subscribe(); ExecutorService executor = Executors.newCachedThreadPool(); // Consume from multiple threads for (int i = 0; i < 100; i++) { executor.execute(() -> { try { while (true) { Message<byte[]> msg = consumer.receive(); System.out.println("Received " + msg.getMessageId()); Thread.sleep(random.nextInt(150)); consumer.acknowledgeAsync(msg); } } catch (Exception e) { e.printStackTrace(); } }); } ``` Interestinly it only happens when the sleep is inserted. I'll dig more to see what's happening
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