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From Rob Davies <>
Subject Re: Durable topics question
Date Sun, 03 Sep 2006 17:52:48 GMT
Hi Naaman,

persistent messages sent to durable subscribers are always stored to  
a persistent store. However, references to the stored messages are  
held in memory - so it can be possible if a large number of messages  
are sent to a non-active durable subscriber for the broker to stop  
processing until more free memory is available for the message  
There will be a solution for this in the next release


On 3 Sep 2006, at 09:00, nlif wrote:

> Hi,
> I am using a topic to publish to multiple clients. Since  
> communication with
> some of the clients may be intermittent, I want to use a durable  
> topic, so
> that messages will be kept for clients not connected at the moment of
> publishing. However, here is my concern: some of my clients may be  
> down for
> a very long time (hours or even days). I assume topic durability is
> implemented by storing messages in broker memory, and therefore, I am
> concerned that as more and more messages accumulate in memory the  
> broker
> will be brought down, or will simply refuse to accept new messages  
> until old
> messages are delivered. I would like to know if there is any  
> solution to
> this issue, such as dumping messages to database after a while, so  
> they are
> available when the client finally shows up, but do not take up  
> memory in the
> meantime.
> Thanks,
> Naaman
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