[rabbitmq-discuss] RabbitMQ configuration

John Apps johndapps at gmail.com
Thu May 13 16:04:08 BST 2010

http://www.rabbitmq.com/install.html is a good place to start.

On Thu, May 13, 2010 at 14:30, Roaan Vos <listuser at codeshrink.com> wrote:

> Hi,
> Thanks for the reply.
> Unfortunately it has to be windows as our company does not support non
> windows.
> As to our usage.
> We're processing messages from a stock exchange and setup a routing key
> containing of "level.isin"
> where the level can be level 1 or level 2 depending on the type of
> information and the isin is the stock.
> "Clients" can then bind to a specific routing key to get just the
> information they need.
> I'm thus using RabbitMQ as a way to transfer data and demultiplex the
> information that comes through.
> I could use RabbitMQ just for the message transfer and then do the
> demultiplexing myself but I thought I'd take a shortcut.
> On the configuration. Is there some documentation on what or how RabbitMQ
> can be configured.
> Currently I can't find a configuration file anywhere so don't know
> where/how to start.
> Thanks again
> Roaan
> On Thu, May 13, 2010 at 11:45 AM, Matthew Sackman <matthew at lshift.net>wrote:
>> Hi Roaan,
>> On Thu, May 13, 2010 at 06:57:19AM +0200, Roaan Vos wrote:
>> > We've been having problems with RabbitMQ just "hanging".
>> > This is with the default installation, i.e no configuration.
>> It's likely you've run out of memory and Rabbit's raised the
>> channel.flow flag, preventing you from publishing more messages to it.
>> Check the logs for memory high watermark warnings. This issue is fixed
>> with the new persister branch as messages can be sent to disk and
>> forgotten from RAM.
>> > Can any one help with a configuration file or point me to where I can
>> find
>> > information on how to configure RabbitMQ.
>> There's not a great deal you can do to fix this issue other than
>> compiling from source with the new persister branch (bug21673), or
>> installing much more memory.
>> > We're running RabbitMQ 1.7.2 on a single node on Windows 2008 Server.
>> Windows is a bad idea because there is no 64-bit Erlang available. As
>> such, it doesn't matter how much RAM you have installed, only 2GB will
>> be available to Rabbit. If you need to use Windows then your only
>> solution will be to use the new persister branch (but compiling under
>> Windows is involved to say the least - you'll need to start with
>> cygwin). Really we'd recommend a Linux server here.
>> That said, all my assumptions may be totally wrong - how many messages
>> (and what size) are you buffering in Rabbit? Are you correctly acking
>> messages when you're consuming them?
>> > Also we're aiming on having about 10 thousand clients (connections) each
>> > with their own queue. (Using Topics)
>> > Is this feasable?
>> Connections - yes. You will probably need to raise the process limit -
>> about a million should be fine. Under non-Windows this would involve
>> putting SERVER_START_ARGS="+P 1048576" into the rabbitmq.conf file
>> (which normally lives under /etc/rabbitmq). However, because of lack of
>> features of Windows BAT files, there is no such .conf file, so you need
>> to set the environment variable RABBITMQ_SERVER_START_ARGS and set the
>> value to "+P 1048576". That should do the trick.
>> Topic exchanges are inefficient in our current implementation. It's not
>> normally necessary to use them either - unless your domain of routing
>> keys really is unbounded. Can you describe more about your use case and
>> we should be able to advise you further.
>> Matthew
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John Apps
(49) 171 869 1813
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