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From Rob Davies <>
Subject Re: Just how Durable is Durable?
Date Fri, 09 Oct 2009 22:09:48 GMT

On 9 Oct 2009, at 22:40, RKParkJr wrote:

> A project I am working on what's to use the Durable Subscription  
> policy.  The
> documentation I can find on it, implies that persistent messages  
> sent to a
> durable subscriber will always get there, no matter how long it  
> takes the
> client to return. I'm 100% sure that there is some limit but I'm not  
> sure
> how to calculate this limit.
> Clearly, it's related to the number and/or size of my messages.  What
> configurations in ActiveMQ control how many messages or how much the  
> size of
> my persisted messages can take up?  Or is there no such  
> configuration and
> it's purely related to how much disk space I have under
> ${activemq.base}/data?  Or is it related to the Subscription Recovery
> Policy?
> Thanks in advance,
> Ron
> -- 
> View this message in context:
> Sent from the ActiveMQ - User mailing list archive at

Hi Ron,

how durable is durable ? - is really only determined by how much disk  
space is available. This is unique in open source messaging  to  
ActiveMQ - in that the depth (number of messages) for a durable topic  
or queue is only bound by the amount of disk space available.


Rob Davies
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