Facebook: MVC Does Not Scale, Use Flux Instead

MVC scales fine for what its meant for. I'm going to hazard a guess and say they were putting far more than a web app layer into the thing. MVC by definition is easy to debug you can look at the inputs and follow through to the output exactly. Their complaint of a messaging bug saying the user had a message when they didn't is a clear cut example of muddling routes and code duplication.

If you're trying to push an api layer into MVC you're probably going to run into problems at any kind of scale because your application doesn't end there, it goes through into the client layer and loses control of how data is represented.

Keen to hear any other thoughts on this but that is my view.

Put 54gb of code into any framework and you're going to run into "scaling" issues.