On Mon, Oct 29, 2012 at 8:41 PM, Eric Wong <normalper...@yhbt.net> wrote: > I'm not sure, Tom can investigate further. > > I do recall haproxy having more intelligent load distribution than > nginx, so it can send requests to less-busy machines, at least.
It is correct that HAProxy can do more intelligent load distribution. The "maxconn 1" feature in HAProxy is a bit like global queuing in Phusion Passenger, or the kernel socket queuing that Unicorn relies on. Phusion Passenger sends the request to the first worker that becomes available, and the kernel passes the connection to the first Unicorn instance that accept()s the socket. Nginx's proxy_module passes requests immediately and only does round robin. So to solve this problem we need to add 2 features to the layer that manages the queue: 1. It must be able to detect an early disconnect. 2. It must be able to remove a client from the queue. The kernel obviously can't do this, but I'm very curious as to whether HAProxy supports these two things. I also think it shouldn't be too hard to implement this in Phusion Passenger 4's new architecture. -- Phusion | Ruby & Rails deployment, scaling and tuning solutions Web: http://www.phusion.nl/ E-mail: i...@phusion.nl Chamber of commerce no: 08173483 (The Netherlands) _______________________________________________ Unicorn mailing list - mongrel-unicorn@rubyforge.org http://rubyforge.org/mailman/listinfo/mongrel-unicorn Do not quote signatures (like this one) or top post when replying
