Google uses a custom implementation of the Perforce interface called Piper. Google has looked at git and mercurial, but have concluded that they can't scale to

Google uses a custom implementation of the Perforce interface called Piper. Google has looked at git and mercurial, but have concluded that they can't scale to the level they need it to. Read more about it here: https://cacm.acm.org/magazines/2016/7/204032-why-google-stores-billions-of-lines-of-code-in-a-single-repository/fulltext https://cacm.acm.org/magazines/2016/7/204032-why-google-stor...