[GitHub] [pulsar] michalcukierman commented on issue #21104: [Bug] Client with shared subscription is blocked

["michalcukierman (via GitHub)" <gi...@apache.org>]

michalcukierman commented on issue #21104:
URL: https://github.com/apache/pulsar/issues/21104#issuecomment-1702584503

   Two files attached:
   [partitioned.stats.internal.txt](https://github.com/apache/pulsar/files/12497246/partitioned.stats.internal.txt)
   [partitioned.stats.txt](https://github.com/apache/pulsar/files/12497248/partitioned.stats.txt)
   
   I see that in stats we have:
   ```
           "availablePermits" : 0,
           "unackedMessages" : 25,
   
           "availablePermits" : 0,
           "unackedMessages" : 32,
   ```
   
   , but I do ack all of the messages:
   ```java
       Consumer consumer = client.newConsumer()
           .topic(sourceTopic)
           .subscriptionInitialPosition(SubscriptionInitialPosition.Earliest)
           .subscriptionName(subscriptionName)
           .subscriptionType(SubscriptionType.Shared)
           .receiverQueueSize(8)
           .ackTimeout(ackTimeout, TimeUnit.SECONDS)
           .subscribe();
   
       Producer<byte[]> producer = client.newProducer(Schema.BYTES)
           .topic(destinationTopic)
           .compressionType(CompressionType.LZ4)
           .maxPendingMessages(8)  // Support 5 MB files
           .blockIfQueueFull(true) // Support 5 MB files
           .batchingMaxBytes(5242880)
           .create();
   
       Multi<Messagemessages = Multi.createBy().repeating()
           .completionStage(consumer::receiveAsync)
           .until(m -> closed.get());
   
       messages.subscribe().with(msg -> {
         receivedDistribution.record(getKiloBytesSize(msg.getData()));
         Uni.createFrom().completionStage(producer.newMessage(Schema.BYTES)
                 .key(msg.getKey())
                 .value(msg.getValue().getContent().getPayload().toByteArray())
                 .eventTime(msg.getEventTime()).sendAsync())
             .subscribe().with(msgId -> {
               sentCounter.increment();
               try {
                 consumer.acknowledge(msg.getMessageId());
               } catch (PulsarClientException e) {
                 throw new RuntimeException("Unable to send or ACK the message", e);
               }
             });
       });
     }
   ```
   It can be confirmed in the log files, where sentCounter is just on message behind 
   <img width="1165" alt="Screenshot 2023-09-01 at 13 11 49" src="https://github.com/apache/pulsar/assets/4356553/71eac4c5-9f9a-4626-aeee-e89cf125e19c">
   


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