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As you know we can use short hash as commit id. But I wonder why there is a long hash?

Thanks.

Matt
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Altay Turan
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1 Answers1

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Hash is that long to reduce risk of collision

https://en.m.wikipedia.org/wiki/Hash_collision

Pierwiastek
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  • If there is a risk of collision why we are using short hash? – Altay Turan Nov 12 '22 at 08:22
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    @AltayTuran Just for convenience. If there are two objects in the repository that are identical in the abbreviated form, then you must use a longer abbreviation. – j6t Nov 12 '22 at 08:31
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    When Git prints abbreviated hashes, it ensures that they are unique *at the time they are printed*; they could become ambiguous later as the repository grows. – j6t Nov 12 '22 at 08:32