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A comment on Google Is 2B Lines of Code, All in One Place. Parent comment

Re:Google Is 2B Lines of Code, All in One Place by lighthawk on Wednesday September 16, 2015 @02:32PM (#10228747)
> Git isn't so awesome that it's inconceivable that people would be willing to use something else.

Inconceivable? No, I just asked why. Git to me is a great solution for source control, so I want to understand it's deficiency for handling large amounts of code, especially considering it is used for managing Linux source and handles everything in GitHub I've used quite well.

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Re:Google Is 2B Lines of Code, All in One Place by spectral321 on Wednesday September 16, 2015 @02:42PM (#10228809)
Git is fine at scaling horizontally (many repositories), so things like GitHub work well. Neither Git nor Mercurial do well at scaling to a single massive repository; getting Mercurial to do so was easier because we can implement it as out-of-core extensions (see http://bitbucket.org/Google/narrowhg, for example).

There's also internal-only things to deal with, such as the CitC integration. Because of some of the design decisions behind CitC, storing a typical .git or a .hg directory in CitC is essentially impossible. Mercurial's .hg directory is intentionally a black-box - you interact with the repo using the hg tool. The .git directory can be seen as an API - there are at least three implementations that matter for our purposes, and if we change something in the .git directory, we lose the editor/IDE integration powered by the ones we didn't fix (or we did fix, but they haven't been released yet; some of those are linked into products that have a commercial release cycle).

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