A/B testing on App Engine?

Question

What would be the simplest implementation of an A/B testing system running on App engine?

I'm especially keen towards performance implications of using Datastore for back-end (with looong query times), and database design.

Answer 1

Have a look to Gae/Bingo, it's an A/B split-testing framework for App Engine inspired by A/Bingo.

More information here.

Answer 2

You could deploy two versions of your application:

appcfg.py update -V "A" mysiteA/
appcfg.py update -V "B" mysiteB/

And then create a third version that simply chooses whether to proxy a user to A.latest.mysite.appspot.com or B.latest.mysite.appspot.com.