App Engine: What is the lifetime of the app-level registry in webapp2

Question

I wonder if the registry is kept between backend restarts. Is it a persistent shared storage, or memory only, or something in between?

Answer 1

The registry you referenced is stored in the webapp2.WSGIApplication instance and therefore is available for the life of that Frontend Instance.

webapp2 also offers a registry for each Request.

Reference:

• http://webapp-improved.appspot.com/guide/app.html#registry