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_r264408333
 
 

 ##########
 File path: 
artemis-server/src/main/java/org/apache/activemq/artemis/core/server/impl/QueueImpl.java
 ##########
 @@ -3069,57 +3080,74 @@ private void move(final Transaction originalTX,
     * This method delivers the reference on the callers thread - this can give 
us better latency in the case there is nothing in the queue
     */
    private boolean deliverDirect(final MessageReference ref) {
-      synchronized (this) {
-         if (!supportsDirectDeliver) {
-            return false;
-         }
-         if (paused || !canDispatch() && redistributor == null) {
-            return false;
-         }
+      //The order to enter the deliverLock re QueueImpl::this lock is very 
important:
 
 Review comment:
   Its private, its no different to someone calling deliver() not within the 
runner.

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