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My understanding is that neither Git nor Mercurial can do this well out of the box, and FB and Google both have their own extensions to Mercurial to make this p

My understanding is that neither Git nor Mercurial can do this well out of the box, and FB and Google both have their own extensions to Mercurial to make this possible (because even though Mercurial is often slower than Git, it’s extensible) e.g. https://facebook.github.io/watchman/ https://facebook.github.io/watchman/ - used as part of Facebook’s Mercurial solution, I think.

vtbassmatt 6y ago
Git also has a file system monitor interface which can use Watchman. We (GitHub) are working on a native file system monitor implementation in addition - https://github.com/gitgitgadget/git/pull/900 https://github.com/gitgitgadget/git/pull/900.
jauer 6y ago
And then from mercurial extensions to our own server, mononoke, which apparently has been moved under the Eden umbrella: https://github.com/facebookexperimental/eden https://github.com/facebookexperimental/eden
jayd16 6y ago
I thought Google used some custom fork of perforce.
- klodolph 6y ago
  From what I understand, Piper is not a fork of Perforce, but instead a completely different system with the same interface. You know, built on top of a BigTable or Spanner cluster instead of whatever Perforce uses. The Mercurial extensions are then an alternative client for Piper.
  - dlp211 6y ago
    It's my understanding that it started as a fork of perforce, Google bought a source license for perforce. Whether you'd still call a fork of perforce anymore is like asking if a Computer is the same computer after you've replaced all the components over the years.
    - arthurdenture 6y ago
      That was the case many years ago (extremely customized perforce server), but after that there was a full rewrite as a distributed system built on Bigtable etc. - 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... is an overview. It wasn't a ship-of-Theseus type situation where they incrementally replaced components.

vtbassmatt 6y ago

Git also has a file system monitor interface which can use Watchman. We (GitHub) are working on a native file system monitor implementation in addition - https://github.com/gitgitgadget/git/pull/900 https://github.com/gitgitgadget/git/pull/900.

jauer 6y ago

And then from mercurial extensions to our own server, mononoke, which apparently has been moved under the Eden umbrella: https://github.com/facebookexperimental/eden https://github.com/facebookexperimental/eden

jayd16 6y ago

I thought Google used some custom fork of perforce.

klodolph 6y ago
From what I understand, Piper is not a fork of Perforce, but instead a completely different system with the same interface. You know, built on top of a BigTable or Spanner cluster instead of whatever Perforce uses. The Mercurial extensions are then an alternative client for Piper.
- dlp211 6y ago
  It's my understanding that it started as a fork of perforce, Google bought a source license for perforce. Whether you'd still call a fork of perforce anymore is like asking if a Computer is the same computer after you've replaced all the components over the years.
  - arthurdenture 6y ago
    That was the case many years ago (extremely customized perforce server), but after that there was a full rewrite as a distributed system built on Bigtable etc. - 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... is an overview. It wasn't a ship-of-Theseus type situation where they incrementally replaced components.