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

submitted 4 months ago by [email protected] to c/[email protected]

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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.

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[–] [email protected] 4 points 4 months ago (1 children)

Commit IDs are only local anyway.

Whay do you mean by that?

[–] [email protected] 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.

[–] [email protected] 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?

[–] [email protected] 2 points 3 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.