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From: Rob Davies <rajdavies@gmail.com>
To: users@activemq.apache.org
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Subject: Re: OOME - ActiveMQMessageConsumer.unconsumedMessages
Date: Thu, 1 May 2008 06:30:19 +0100
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On 1 May 2008, at 00:02, Filip Hanik - Dev Lists wrote:

> There doesnt seem to be a way of limiting how messages are delivered  
> to the client.
> the ActiveMQMessageConsumer.unconsumedMessages seems to fill up, all  
> to quickly, and eventually cause an OOME
>
> we have this setting on the server
> <destinationPolicy>      <policyMap>
>       <policyEntries>
>         <policyEntry topic=">" producerFlowControl="false"  
> memoryLimit="10mb">
>           <deadLetterStrategy>               
> <sharedDeadLetterStrategy processExpired="false"  
> processNonPersistent="false" />            </deadLetterStrategy>
>           <!--  10 seconds worth -->
>           <!-- lets force old messages to be discarded for slow  
> consumers -->
>           <pendingMessageLimitStrategy>
>             <constantPendingMessageLimitStrategy limit="1000"/>
>           </pendingMessageLimitStrategy>
>         </policyEntry>              </policyEntries>
>     </policyMap>
>   </destinationPolicy>
>
>
> is there another setting to protect against this kind of OOME
>
> Filip

Hi Filip,

You can override how many messages are delivered to a consumer by  
setting its prefetch limit - see the FAQ entry - http://activemq.apache.org/what-is-the-prefetch-limit-for.html




cheers,

Rob

http://open.iona.com/ -Enterprise Open Integration
http://rajdavies.blogspot.com/