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Subject: AW: limit the number of messages per second
Date: Thu, 15 Jun 2006 14:33:23 +0200
Message-ID: 
 <001FD7EB9646934B9237F09DE8E1F07C02F8C146@DE0-MAILMB02.res.airbus.corp>
Thread-Topic: limit the number of messages per second
Thread-Index: AcaQdsj6wJrytXJUS2CQOf/IzIQ1eAAABIaA
From: "Gerdes, Mike" <Mike.Gerdes@airbus.com>
To: <activemq-users@geronimo.apache.org>


I want this feature to make AMQ a bit more stable, to reduce network=
 traffic and prevent flooding and to avoid that a software with errors=
 kills my system.

>From what I noticed is that AMQ does have some memory problems and that it=
 hits under certain circumstances 100 used memory and crashes then. But=
 thats the smaller reason. The major reason is just for security. In my=
 testing and application I need to have a system that is more or less=
 stable and secure. And DoS and flooding of queues seems to me a big=
 problem.

One thing about the memory problem, I have encountered. With more then one=
 consumer and using queue, AMQ crashes with 100% used memory if I send as=
 fast as possible. This happens with and without async messages. What I=
 noticed is that the usageManagers request more and more memory and at some=
 point don't get it and then block. When a message from a queue is read,=
 its memory is not freed. With only on consumer this haven'T been the case.=
 There has the memory be freed.
(I put reference counter System.out.println into the usageManger)

-----Urspr=FCngliche Nachricht-----
Von: James Strachan [mailto:james.strachan@gmail.com]
Gesendet: Donnerstag, 15. Juni 2006 14:02
An: activemq-users@geronimo.apache.org
Betreff: Re: limit the number of messages per second


On 6/15/06, Gerdes, Mike <Mike.Gerdes@airbus.com> wrote:
>
> Hi,
>
> I is it possible in AMQ to set a limit for the max number of messages per=
 second, from all or one consumer?

Not currently no. Just out of interest, whats you use case?

You could write a bridge which takes messages off an input queue and
then forwards them to an ouput queue but such that it throttles the
publisher to only publish a certain number of messages per second to
limit the rate at which messages are made available to consumers.
--=0D

James
-------
http://radio.weblogs.com/0112098/

=0D
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