tabish121 commented on code in PR #5848:
URL: https://github.com/apache/activemq-artemis/pull/5848#discussion_r2243608140


##########
artemis-server/src/main/java/org/apache/activemq/artemis/core/server/impl/ServerConsumerImpl.java:
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@@ -526,7 +526,11 @@ public void proceedDeliver(MessageReference reference) 
throws Exception {
          }
       } finally {
          pendingDelivery.countDown();
-         callback.afterDelivery();
+         synchronized (lock) {

Review Comment:
   The main downside would be the extensive use of the session callback 
variable throughout the ServerComsumerImpl code do now all become volatile 
reads so will incur some small performance penalty compared to the past, how 
much of a penalty would require testing to really gauge.  



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