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Date: Mon, 06 Feb 2012 19:40:39 -0800
From: Brian Wright <brianw@marketo.com>
Organization: Marketo.com
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To: users@activemq.apache.org
Subject: Question about activemq queue message events
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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 *brianw@marketo.com <mailto:brianw@marketo.com>
*Phone *+1.650.539.3530**
*****www.marketo.com <http://www.marketo.com/>*

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    Hello,<br>
    <br>
    I'm actually asking this question on behalf of one of our
    developers.&nbsp; 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.&nbsp; It is then the consumer's
    job to pick up the new message and process it.<br>
    <br>
    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.&nbsp; So, the message
    queue was backing up and messages were not being processed.&nbsp; Note
    that we have about 8 different queues on this Servicemix server, but
    only one of the queues exhibited this behavior.&nbsp; As a result, the
    processing ground to a halt on this specific queue and queue
    messages backed up.&nbsp; Once we restarted everything involving
    servicemix, activemx and the consumer of the queue, everything went
    back to normal processing speed.<br>
    <br>
    I'm trying to determine if there are any known issues that could
    cause this behavior within ActiveMQ.&nbsp; 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).<br>
    <br>
    As another question, since it appears ActiveMQ was included in the
    Servicemix package, should I ask this question on the Servicemix
    forum instead?<br>
    <br>
    Any help would be appreciated.<br>
    <br>
    Thanks.<br>
    <br>
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                  style="font-size: 12pt; line-height: 115%;
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                </span><b><span style="font-size: 7.5pt; line-height:
                    115%; font-family:
                    &quot;Verdana&quot;,&quot;sans-serif&quot;; color:
                    rgb(51, 51, 51);">Sr. UNIX Systems Administrator</span></b><span
                  style="font-size: 7.5pt; line-height: 115%;
                  font-family:
                  &quot;Verdana&quot;,&quot;sans-serif&quot;;"><br>
                  901 Mariners Island Blvd Suite 200<br>
                  San Mateo,&nbsp;CA&nbsp;94404 USA<span style="font-weight:
                    bold;"><br>
                  </span></span><b><span style="font-size: 7.5pt;
                    line-height: 115%; font-family:
                    &quot;Verdana&quot;,&quot;sans-serif&quot;; color:
                    rgb(128, 100, 162);">Email&nbsp; </span></b><span
                  style="font-size: 7.5pt; line-height: 115%;
                  font-family:
                  &quot;Verdana&quot;,&quot;sans-serif&quot;;"><a
                    href="mailto:brianw@marketo.com"><span style="color:
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                  <b><span style="color: rgb(128, 100, 162);">Phone</span>
                  </b>+1.650.539.3530<b><span style="color: rgb(128,
                      100, 162);"></span></b><br>
                  <b><span style="color: rgb(128, 100, 162);"></span></b><b><span
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