[rabbitmq-discuss] RabbitMQ cluster with potentially millions of connections

Sandeep Aggarwal aggarwalsandeep at optonline.net
Tue Jan 29 20:12:38 GMT 2013

To RabbitMQ gurus - Could you please post the replies here instead of just 
replying to the original person (Roman in this case). This is something of 
interest to me as well and I would like to follow this thread. Thx!

On Saturday, January 26, 2013 6:58:36 AM UTC-5, Romanas S. wrote:
> Hi guys,
>  I'm trying to come up with an architecture for a RabbitMQ cluster that 
> could potentially handle millions of (persistent) connections. I've set up 
> a cluster of Rabbits with 3 nodes (16GB RAM, 4x cpu cores each) and a Load 
> Balancer in front of them, increased all of the system limits on sockets 
> and file descriptors, but can't seem to scale to more then 30k connections 
> on the entire cluster. 
> Each connections has it's own exchange and a temporary direct queue, RAM 
> usage is about 2-3GB on each node and CPU usage peaks at about 200% (which 
> on 4 cores isn't all that bad). At first all is quite well and the cluster 
> manages upwards of 1k msgs/second (I haven't tried more, pretty sure it 
> would handle it). However, after scaling to that many connections, the 
> cluster seems to grind to a halt and eventually nodes become unresponsive. 
> The management API takes upwards of 5 (FIVE!) minutes to retrieve a server 
> summary report. Am I missing something here? Or is this just a bad idea 
> altogether? I was expecting that if each node was able to handle 30k+ 
> connections, I could have a cluster of 50 or so (with multiple balancers, 
> of course!) and live a happy life  ;-)
> Thanks,
> Roman
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