[jboss-jira] [JBoss JIRA] (JGRP-1414) Synchronizing on 'members' MessageDispatcher.cast() is a contention point

Synchronizing on 'members' MessageDispatcher.cast() is a contention point ------------------------------------------------------------------------- Key: JGRP-1414 URL: https://issues.jboss.org/browse/JGRP-1414 Project: JGroups Issue Type: Bug Affects Versions: 3.0.2 Reporter: Manik Surtani Assignee: Manik Surtani Labels: concurrency, performance Fix For: 3.0.3 Attachments: TreeSet.png MessageDispatcher.cast() synchronizes on {{members}} and copies it to a local collection if {{null}} is passed in as your destination list. This is a contention point if you have many concurrent threads attempting to cast() to the entire cluster, as they start queueing up at this point. Guarding {{members}} with a ReadWriteLock is probably a better approach, allowing {{members}} to be read safely and concurrently. However, since {{members}} is protected, I am not sure of the implications around this. But then again, there is no guarantee that subclasses/extensions synchronize on {{members}} anyway.