[rabbitmq-discuss] the cost of creating a queue?
francesco at rabbitmq.com
Wed Oct 17 11:16:16 BST 2012
At Wed, 17 Oct 2012 11:02:51 +0200,
Alex Shneyderman wrote:
> I am curious if there are any numbers available on what amount of
> resources does it take to create a queue? It is a clustered env. Most
> of the queues are mirrored (durable and non).
> The design of the system I have in mind is that I create one (maybe
> two) queue per instance (each instance has 5 consumers and one
> publisher and they all live on two connections to rabbit one for
> publisher and one for consumers) that is part of the system. There are
> up-to 100 instances ATM and that number might grow in the future. So,
> there are about 100-200 queues that get created and need to be kept up
> by Rabbit. I am curious if there is any estimate on how much RAM per
> queue is required? Disk space? Any gotchas in the design you see right
> from its description :-) ?
100-200 queues won't be a problem, at all. I cannot give you exact numbers, but
creating a queue basically amounts to creating a record in the mnesia database,
and the record is quite tiny:
There will be an overhead when creating a queue in a clustered rabbit (since the
mnesia transaction has to be synchronised across the nodes) but there won't be
much creating an HA queue (the slaves are contacted asynchronously when creating
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