ab testing - Google App Engine upgrading part by part

Question

I have a complex appengine service that was written in PHP, now I want to migrate it to Python part by part.

Let's say that my service has 2 parts: /signIn/.... and /data/.... I just want to migrate /signIn/ part first, then /data/ later.

However, since my service is big, so I want to build new /signIn/ part in Python, then use Traffic Splitting to make some A/B Testing on this part.

My problem is that Traffic Splitting can be applied on versions only, so my old and new versions have to be in same module, and same module means that they have to written in same language (I was wrong here, see updated part). But I am migrating from PHP to Python.

What is the best solution for me?

Thanks,

Solution

With Dan Cornilescu's helping, this is what I do:

1. Split the app into 2 modules: default and old-version.
2. Dispatch /signIn/ into default module, the rest to old-version module.
3. Make another version of /signIn/ (default module) in Python
4. Configure Traffic Splitting to slowly increase requests percent into Python part. This will allow us to test and make sure there is no serious bug happen.

Note: The /signIn/ part must be default module, since GAE's traffic splitting works at default module only.

I confirmed that we can make 2 versions in different language for a module.

Answer 1

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