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From Christoph Kutzinski <ku...@gmx.de>
Subject Re: Problem with 'dispatched queue'
Date Mon, 01 Feb 2010 12:36:45 GMT

I've got the hint that this is related to 
https://issues.apache.org/activemq/browse/AMQ-2567

I've now tried a current Snapshot of ActiveMQ 5.4 which contains the fix for
it and it works as expected!

Many thanks to Rudolf Janz for pointing me in that direction and to Gary
Tully for helping me get the right snapshot release.


Christoph



Christoph Kutzinski wrote:
> 
> Hi,
> 
> let me first describe my use-case as it is probably a little bit different
> from the usual JMS use case:
> 
> We have a single process which fills a JMS queue from a pool of available
> items (say we have 50 items total).
> The we have n consumers (lets say 2) which read the items from the queue
> in a synchronous way (i.e. Spring JmsTemplate#receive).
> This goes like so:
> - consumer A fetches 5 items
> - consumer B fetches 20 items
> - consumer A fetches 5 items
> and so on.
> 
> The problem we have now is that we are not able to fetch all items from
> the queue - e.g. if there are still 10 items left in the queue and I want
> to get 10, I only get 5 or so.
> 
> I've already found the prefetchSize configuration and set it to 0 (also
> tried 1), but still the same problem.
> The problem seems to be that each consumer has an internal 'dispatched
> queue' which already has some entries and consumer A has no possibility to
> access the dispatched queue of consumer B.
> 
> For example the web console looks like this:
> Consumer A; Enqueues 10; Dequeues 5; Dispatched 10; Dispatched Queue 5;
> Prefetch 0; Max Pending 0
> 
> Consumer B; Enqueues 20; Dequeues 10; Dispatched 20; Dispatched Queue 10;
> Prefetch 0; Max Pending 0
> 
> In this case there would be e.g. still 15 items total in the queue, but
> with consumer A I would onyl be able to get 5 items and with consumer B
> only 10 items.
> 
> I've tried various configuration options which I found in the ActiveMQ
> docu (dispatchAsync, alwaysSessionAsync, sendAsync, ...), but none seemed
> to help.
> 
> Can anyone help? Does anyone know how to configure/disable this dispatched
> queue?
> 
> 
> thanks
> Christoph
> 
> 

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