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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] 91 points 4 months ago* (last edited 4 months ago) (19 children)

Facebook uses Mercurial, but when people praise their developer tooling it's not just that. They're using their CLI which is built on top of Mercurial but cleans up its errors and commands further, it's all running on their own virtual filesystem (EdenFS), their dev testing in a customized version of chromium, and they sync code using their own in-house equivalent of GitHub, and all of it connects super nicely into their own customized version of VS Codium.

[–] [email protected] 24 points 4 months ago (9 children)

The inhouse tooling from the massive tech companies is very cool but I always wonder how that impacts transferrable skills. I work in a much smaller shop but intentionally make tech decisions that will give our engineers a highly transferrable skill set. If someone wants to leave it should be easy to bring their knowledge to bear elsewhere.

[–] [email protected] 6 points 3 months ago

Absolutely does. Source: worked for Amazon.

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