michaelandrepearce commented on a change in pull request #2577: ARTEMIS-1604 
Artemis deadlock using MQTT Protocol
URL: https://github.com/apache/activemq-artemis/pull/2577#discussion_r264431241
 
 

 ##########
 File path: 
artemis-protocols/artemis-mqtt-protocol/src/main/java/org/apache/activemq/artemis/core/protocol/mqtt/MQTTSessionCallback.java
 ##########
 @@ -36,6 +36,11 @@ public MQTTSessionCallback(MQTTSession session, 
MQTTConnection connection) throw
       this.connection = connection;
    }
 
+   @Override
+   public boolean supportsDirectDelivery() {
 
 Review comment:
   @clebertsuconic i don't see why that impacts if it can direct deliver or 
not, direct deliver in my understanding is if it can use the producer thread, 
to avoid needing to context switch threads and async deliver, for perf benefit, 
as long as transform is non blocking
   
   I iterate though this bug if i understand the change and franz, is theres 
deadlock in queueimpl. NOT the protocols, should fix just whats needed here.

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