franz1981 commented on a change in pull request #2727: ARTEMIS-2394 Improve 
scheduling sync for AMQPConnectionContext
URL: https://github.com/apache/activemq-artemis/pull/2727#discussion_r304885552
 
 

 ##########
 File path: 
artemis-protocols/artemis-amqp-protocol/src/main/java/org/apache/activemq/artemis/protocol/amqp/proton/AMQPConnectionContext.java
 ##########
 @@ -416,42 +414,57 @@ public void onRemoteOpen(Connection connection) throws 
Exception {
        * */
       if (connection.getRemoteProperties() == null || 
!connection.getRemoteProperties().containsKey(CONNECTION_OPEN_FAILED)) {
          long nextKeepAliveTime = handler.tick(true);
-         synchronized (schedulingLock) {
-            if (nextKeepAliveTime != 0 && scheduledPool != null && 
!isSchedulingCancelled) {
-               scheduledFuture = scheduledPool.schedule(new 
ScheduleRunnable(), (nextKeepAliveTime - 
TimeUnit.NANOSECONDS.toMillis(System.nanoTime())), TimeUnit.MILLISECONDS);
-            }
+
+         if (nextKeepAliveTime != 0 && scheduledPool != null) {
+            scheduleOp.setDelay(nextKeepAliveTime - 
TimeUnit.NANOSECONDS.toMillis(System.nanoTime()));
+
+            scheduledFutureRef.getAndUpdate(scheduleOp);
 
 Review comment:
   there is some specific return value from getOrUpdate that you expect to 
find? if yes, maybe you can put an assert there to help spot issues on tests...

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