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From Matt Pavlovich <>
Subject Re: Question about activemq queue message events
Date Tue, 07 Feb 2012 17:31:08 GMT
Hi Brian-

This list is fine, as it sounds like an ActiveMQ-related issue.  There 
are some known issues with AMQ 5.4.2 that could lead to that problem.  
Also, client-side issues such as exhausting connection pools, or leaking 
connections could cause "stuck message" behavior.

I suggest doing some testing against new 5.5.x ActiveMQ releases.  
Specifically, I suggest using the FuseSource builds, since they are more 
frequent than the Apache releases at this time.   They are free to use.

Are you using KahaDB as a back-end data store for AMQ?  Transactions?

Hope this helps,
Matt Pavlovich

On 2/6/12 9:40 PM, Brian Wright wrote:
> Hello,
> I'm actually asking this question on behalf of one of our developers.  
> As I understand ActiveMQ (and Servicemix), when a message is placed 
> into a queue, an event is fired off telling the consumer a new message 
> is now present.  It is then the consumer's job to pick up the new 
> message and process it.
> We had a recent issue where it appeared that new message arrival 
> events were either not firing or firing off very slowly to the 
> consumer as messages were placed into the queue.  So, the message 
> queue was backing up and messages were not being processed.  Note that 
> we have about 8 different queues on this Servicemix server, but only 
> one of the queues exhibited this behavior.  As a result, the 
> processing ground to a halt on this specific queue and queue messages 
> backed up.  Once we restarted everything involving servicemix, 
> activemx and the consumer of the queue, everything went back to normal 
> processing speed.
> I'm trying to determine if there are any known issues that could cause 
> this behavior within ActiveMQ.  We are running Apache Servicemix 
> version 4.3.1-fuse-01-09 using ActiveMQ version 5.4.2 (looks like the 
> ActiveMQ packages were included with the Servicemix package).
> As another question, since it appears ActiveMQ was included in the 
> Servicemix package, should I ask this question on the Servicemix forum 
> instead?
> Any help would be appreciated.
> Thanks.
> -- 
> *Brian Wright*
> *Sr. UNIX Systems Administrator*
> 901 Mariners Island Blvd Suite 200
> San Mateo, CA 94404 USA
> *Email * <>
> *Phone *+1.650.539.3530**
> ***** <>*
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