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Guest
Posted: Sat Oct 17, 2009 1:17 pm Reply with quote
Guest
Hi,
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Guest
Posted: Tue Oct 20, 2009 5:44 am Reply with quote
Guest
Allen,

Allen Jones wrote:
> I am running RMQ 1.6 as a Windows Service on Windows Server 2008 sp1.
> Generally things are fine, but there have been a few instances where the
> service just stops/crashes. The debug info for one recent crash is
> pasted below. Looks like some kind of memory allocation problem, but it
> doesn't seem to be happening necessarily when the exchange is under the
> highest usage/demand, or when the queues are at the largest.
> [...]
> binary_alloc: Cannot allocate 319762309 bytes of memory (of type "binary").
> [...]
> Having a look around, I noticed that the rabbit_persister.log file was
> about this size, so I am assuming the two are related.

It looks like the amount of message data you are asking RabbitMQ to hold
on to exceeds the available memory.

I recommend running 'rabbitmqctl list_queues' to check on how many
messages you have in the queues.


Regards,

Matthias.

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Guest
Posted: Tue Oct 20, 2009 6:32 am Reply with quote
Guest
Allen,

Allen Jones wrote:
> That was my assumption. I have changed my approach to messaging and have
> dramatically reduced the amount of data I am pushing through RMQ. So I seem
> to have solved the problem.

Pushing lots of data through rabbit shouldn't be a problem; it's when
rabbit has to *buffer/store* lots of data - because either there are no
consumers or they are too slow - that memory consumption becomes an issue.

> I was finding it near impossible to find any info on the mnesia database
> that RMQ uses. Do you know of anything useful.

Try http://www.erlang.org/doc/apps/mnesia/part_frame.html

Note that RabbitMQ only stores routing and configuration information in
mnesia. Messages are stored separately, using custom code.


Regards,

Matthias.

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