Programming

17443 readers

220 users here now

Welcome to the main community in programming.dev! Feel free to post anything relating to programming here!

Cross posting is strongly encouraged in the instance. If you feel your post or another person's post makes sense in another community cross post into it.

Hope you enjoy the instance!

Rules

Follow the programming.dev instance rules
Keep content related to programming in some way
If you're posting long videos try to add in some form of tldr for those who don't want to watch videos

Wormhole

Follow the wormhole through a path of communities !webdev@programming.dev

founded 1 year ago

MODERATORS

snowe@programming.dev

Ategon@programming.dev

MaungaHikoi@lemmy.nz

126

Why Facebook does not use Git – and why most other devs do • DEVCLASS (devclass.com)

submitted 4 months ago by AnActOfCreation@programming.dev to c/programming@programming.dev

63 comments fedilink hide all child comments

Facebook does not use Git due to scale issues with their large monorepo, instead opting for Mercurial.
Mercurial may be a better option for large monorepos, but Git has made improvements to support them better.
Despite some drawbacks, Git usage remains dominant with 93.87% share, due to familiarity, additional tools, and industry trends.

you are viewing a single comment's thread
view the rest of the comments

[–] wewbull@feddit.uk 7 points 4 months ago (2 children)

Rebasing updates the commit ids. It's fine. Commit IDs are only local anyway.

One thing that makes mercurial better for rebase based flows is obsolescence markers. The old version of the commits still exist after a rebases and are marked as being made obsolete by the new commits. This means somebody you've shared those old commits with isn't left in hyperspace when they fetch your new commits. There's history about what happened being shared.

[–] AnActOfCreation@programming.dev 4 points 4 months ago (1 children)

Commit IDs are only local anyway.

Whay do you mean by that?

[–] wewbull@feddit.uk 3 points 4 months ago (1 children)

You and I both clone a repo with ten changes in it. We each make a new commit. Both systems will call it commit 11. If I pull your change into my repo your 11 becomes my 12.

The sequential change IDs are only consistent locally.

[–] AnActOfCreation@programming.dev 1 points 4 months ago (1 children)

Got it! Are they renumbered chronologically? Like if my 11 was created before your 11, would yours be the one that's renumbered?

[–] wewbull@feddit.uk 2 points 4 months ago

No. They are not renumbered. Your 11 is always the same commit. It's consistent locally (which is what I mean by "local only") otherwise they'd change under your feet. You just can't share them with others and expect the same results. You have to use the hash for that.

[–] FizzyOrange@programming.dev 2 points 4 months ago (1 children)

That's exactly the same in git. The old commits are still there, they just don't show up in git log because nothing points to them.

[–] aport@programming.dev 1 points 4 months ago (1 children)

Old, unreachable commits will be garbage collected.

[–] FizzyOrange@programming.dev 2 points 4 months ago (1 children)

Does that not happen with Mercurial? If not that seems like a point against it.

[–] aport@programming.dev 1 points 4 months ago (1 children)

I'm confused, the behavior you just said was "exactly the same in git" is now a problem for Mercurial?

[–] FizzyOrange@programming.dev 1 points 4 months ago (1 children)

I thought it was exactly the same based on the description.

[–] wewbull@feddit.uk 1 points 4 months ago* (last edited 4 months ago)

No the old commit is always there, marked as obsolete with the information of what it became. No holes in history. (Assuming you use the obsolecense markers)