[rabbitmq-discuss] Any gotchas when using rabbitmq?

Thu Dec 2 23:25:48 GMT 2010

Ben,

Ben Bennett wrote:
> Also I seen that direct exchange is O(N) when delivering messages, is
> N the number of possible queues.

Direct exchanges have near constant matching time.

Perhaps you were thinking of topic exchanges, which are indeed O(N) atm, 
though we are working on improving that.

> My current design for my system might have bunch of queues on one box
> but it also has 32GB of ram and 16 cores and it is active passive
> cluster node.
> I am trying to figure out if it is going to be problem. We basically
> have clients that are going over http and they will need reply back,
> but the reply is based on
> the client, so I was going to make queue for each client and have it
> expire after a while. There are a limit number of clients, less then
> 2000 unique clients.

That should all be fine. I created 300,000 queues on my desktop today. 
Took just over two minutes and rabbit grew to 2.9GB.

Regards,

Matthias.