Hi, author here. While building this thing, the Node server had the tendency to drop out. I'm monitoring it with God (http://god.rubyforge.org/) now, so it restarts whenever anything goes wrong.
I'm genuinely impressed by how it's holding out now. :)
assuming you proxy requests to the different processes. that's not what those examples are doing - they simply share a server socket and let the kernel load balance incoming connections over them.