Ruby on Rails 4.0.0.beta1 released

Ruby on Rails 4.0.0.beta1 released

I'm not sure what you mean by 'forking the entire codebase'.Even if Rails3, though, Rails supported multi-threaded request dispatching IF you had an app server stack that supported it. In Rails3, you just had to explicitly turn it on with `config.threadsafe!`. Rails4 makes that the default, always on. That's really the only difference. There are at least a few concurrency-related bugs that have been fixed in Rails4 (I'm actually not sure how many), but even Rails3 was officially documented to do multi-threaded concurrent request dispatch just fine. (Actually even Rails 2.2 was!) Finding a mature, reliable, well-documented app server stack that supports multi-threaded concurrent request dispatch may be harder. I can not say which do and which don't, but there are at least some potential options (including puma, which, if I understand it right, has multi-threaded concurrent ...

Full article: http://news.ycombinator.com/item?id=5282870