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

[Manik Surtani (JIRA)]

Manik Surtani created JGRP-1414:
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             Summary: 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: Bela Ban
         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.

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