Well, knowing haproxy user, it is embed into your infrastructure like a tick, so it probably wouldn't help you. My experience has been, if it ain't broke don't

Well, knowing haproxy user, it is embed into your infrastructure like a tick, so it probably wouldn't help you. My experience has been, if it ain't broke don't fix it. But, if I were to do an alternative, I'd basically ditch haproxy and nginx and just have Mongrel2 talking 0MQ or HTTP to arbitrary backends directly, rather than through multiple layers. With 0MQ you don't have a single point of failure by design, so you could (theoretically) run tons of Mongrel2 servers in front and have them talk to big clusters of 0MQ in back. That's the goal anyway.