it's already been published. Google used Perforce for at least a decade and then cloned the perforce wire protocol when it was clear perforce wouldn't keep scaling (there's a great presentation online about google using RAMSANs to store the perforce index), but backed the repo in something like bigtable or spanner.

I'll give google credit for one thing: it can change backends a lot without too much user visible pain.

>I'll give google credit for one thing: it can change backends a lot without too much user visible pain.

Amusingly, this comment may explain how someone in this thread can be incredulous about the idea that things get rewritten every 2-3 years (which yes is an exaggeration).

Google is very good at making sweeping infrastructural changes (generally improvements, I might add) without significant user pain.

It is, like most of the tools in Google/Facebook/..., a custom solution. These companies need their custom solution because of their scale.

It begs the question : are big companies like Atlassian, GitHub or say VolksWagen required, by their scale, to have a slick solution in order to perform on the international market?