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From Will van der Leij <w...@stonethree.com>
Subject RE: Broker not releasing memory
Date Tue, 09 Dec 2008 08:01:52 GMT

I've experienced this on 5.1.0, 5.2.0 and a 5.3.0 snapshot from 2 weeks back.


Frugia, Kirby A wrote:
> 
> 5.1.0.  I believe it's happening with 5.2.0, too, but have not thoroughly
> tested.
> 
> The problem is that the broker runs out of memory.  At the point in time
> of the failure, no more messages could be sent anyway because the broker
> is out of memory.
> 
> So we're less worried about blocking producers and more worried about how
> to maintain the health of the broker.  We set the message queue limits to
> prevent more than X messages on a topic for each consumer.  The queue
> limits are only set to prevent the broker from running out of memory if a
> particular consumer starts blocking.  We are hoping that if a consumer
> dies, the queue limits will at least keep any message queues for the dead
> consumer from going out of control.
> 
> -----Original Message-----
> From: Bruce Snyder [mailto:bruce.snyder@gmail.com]
> Sent: Monday, December 08, 2008 10:17 AM
> To: users@activemq.apache.org
> Subject: Re: Broker not releasing memory
> 
> On Mon, Dec 8, 2008 at 7:28 AM, Frugia, Kirby A <kirby.frugia@hp.com>
> wrote:
>> I can reproduce this with the non-embedded, out-of-the-box broker.  I
>> also think it's an under-the-hood problem.
>>
>> Until we get a fix, we've set pending message queue limits on our busy
>> topics.  So, for example, the broker will only queue up 500 messages on a
>> particular topic per consumer.  This will prevent things from getting too
>> out of hand on a single client crash, but is not the solution to the
>> problem.
> 
> What version of ActiveMQ are you using? Also, have you disabled
> producer flow control to allow the producer to continue to send even
> when the consumer is going very slow?
> 
> Bruce
> --
> perl -e 'print
> unpack("u30","D0G)U8V4\@4VYY9&5R\"F)R=6-E+G-N>61E<D\!G;6%I;\"YC;VT*"
> );'
> 
> Apache ActiveMQ - http://activemq.org/
> Apache Camel - http://activemq.org/camel/
> Apache ServiceMix - http://servicemix.org/
> 
> Blog: http://bruceblog.org/
> 
> 

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