[ http://jira.jboss.com/jira/browse/JBAS-1348?page=history ]
Scott M Stark moved JBMQ-6 to JBAS-1348:
----------------------------------------
Project: JBoss Application Server (was: JBoss MQ)
Key: JBAS-1348 (was: JBMQ-6)
Component: JMS service
(was: Server)
Version: JBossAS-4.0.1 Final
JBossAS-3.2.7 Final
> Message Selector Performance
> ----------------------------
>
> Key: JBAS-1348
> URL: http://jira.jboss.com/jira/browse/JBAS-1348
> Project: JBoss Application Server
> Type: Task
> Components: JMS service
> Versions: JBossAS-4.0.1 Final, JBossAS-3.2.7 Final
> Reporter: Adrian Brock
> Priority: Minor
>
>
> Improving Message Selector Performance
> It is a common anti-pattern for users to set up a contested queue
> where multiple receivers try to take messages based on a message selector.
> In most circumstances a Topic is what they should be using.
> But there is a circumstance where a Topic does not work as required,
> that is when a message matches many of the receiver's selector but you
> only want one receiver to process the message (it doesn't matter which).
> The problem is that when a receiver does not match a message towards
> the top of a large Queue (or none at all). The operation to find a message
> or discover there are no messages is very expensive. It is read and skip.
> This can be even worse when the bottom of the queue has been moved out
> to disk by the MessageCache.
> The solution is to provide "an index" over a particular property,
> e.g.
> <mbean code="org.jboss.mq.server.jmx.Queue"
> name="jboss.mq.destination:service=Queue,name=A">
> <optimized-selector>JMSMessageID</optimized-selector>
> <depends
> optional-attribute-name="DestinationManager">jboss.mq:service=DestinationManager</depends>
> </mbean>
> This configuration should be passed via the BasicQueueParameters to the
> BasicQueue.
> NOTE: This is irrevelent for Topics. Topics run their selector before the
> message is added
> to the subscription, anything not matching the selector is dropped.
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