[kevinsf90]

For a large codebase, these upgrades will be a pain, especially on ruby/rails. To scale in the long run, it'd probably be wise to modularize & split the codebase into microservices, and at the same time, port to, say, a scala or java based framework (like Play).

[lucaspiller]

I'd be interested in hearing a bit more about how GitHub structure their app. From the sounds of it, they have one big monolithic app. Running the tests can't be pretty on that...

[holman]

Yup; one monolithic app. Tests run in a tad over two minutes.

[nathan_f77]

That is insanely fast, for what must be an enormous codebase. Do you mean it runs in two minutes on your Mac, or on distributed CI servers?

[charliesome]

We use the test-queue gem (https://github.com/tmm1/test-queue) to run our test suite in parallel across 10x 8 core machines.

[nathan_f77]

That's awesome! We were using parallel_tests, but we just bought a second test server. I was looking into Kochiku from Square, but that gem looks perfect. Thanks!

[VeejayRampay]

Two minutes is actually pretty fast for such a large app. Well done. And congratulations on the migration.

[imjoshholloway]

What's the coverage on that?

[matthewmacleod]

Why do you think that Scala or Java will help to reduce upgrade cost?