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From Rob Davies <>
Subject Re: Broker Hangs with Durable subscriptions
Date Thu, 31 Dec 2009 12:23:58 GMT
I would suggest you upgrade to 5.3 if possible - it would be the most  
straight forward way to resolve this
On 31 Dec 2009, at 09:59, KameshBathina wrote:

> Hi,
> We are using ActiveMQ 4 as messaging middle ware in our application.  
> Our
> architecture involves many (~20) durable subscribers and single  
> producer,
> all consumers are subscribed to a single topic. The producer sends  
> keep
> alive messages to all consumers periodically.
> When one of the consumer goes down, then the pending messages for that
> consumer are keep growing and over a time it occupying 20MB (default  
> broker
> memory for AMQ 4) and making broker MemoryPercentageUsed to 100%.  
> After this
> point the producer is blocked in publish() method. Hope that the  
> default
> producer flow control mechanism is triggering and halting the  
> producer. Even
> though other consumers are working fine, due to one down consumer  
> entire
> messaging system is going into hang state. The broker is in this  
> state till
> the DOWN consumer is up and consumed its messages.
> I have gone through documentation and user forums and found that
> "constantPendingMessageLimitStrategy" and  
> "constantPendingMessageLimit"
> properties can be used to limit the number of pending messages per  
> consumer.
> But these options are not working for durable subscribers.
> I tried with timetolive option with messages also, in AMQ 4 this  
> field is
> not working (ie., even after timetolive expired the messages are not  
> getting
> removed from messaging system)
> Can any body suggest me how can I avoid this issue with durable  
> subscribers
> and limit the pending messages so that producer will not block and  
> rest of
> the system will work fine.
> Thanks and Regards,
> Kamesh
> -- 
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Rob Davies
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