Is Rails shared-nothing or can separate requests access the same runtime variables?

Question

PHP runs in a shared-nothing environment, which in this context means that every web request is run in a clean environment. You can not access another request\'s data excep

Answer 1

In your average deployment using Passenger, you probably have multiple app processes that share nothing between them but classes within each process that maintain their (static) state from request to request. Each request, though, makes a new instance of your controllers.

You might call this a cluster of distinct shared-state environments.

To use your Java analogy, you can do the caching and have it work from request to request, you just can't assume that it will be available on every request.