https://bugzilla.wikimedia.org/show_bug.cgi?id=21860
Gurch <matthew.brit...@btinternet.com> changed:
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--- Comment #11 from Gurch <matthew.brit...@btinternet.com> 2010-02-17 11:58:20
UTC ---
(In reply to comment #10)
> If anyone wants to reopen this bug, feel free to provide collision percentages
> on the projects data, and how it deviates from 'length' collision data.
I think it's more that the collision odds for a checksum are low enough (on the
order of, say, 1 in 2^32, even if not actually that low) that one can
confidently assume they represent different data, which you can't do for
length.
For heuristic "these might be the same revision" purposes, length is enough.
For "this is definitely the same revision as revision X, therefore since we've
already checked that revision, we don't have to check this one" purposes, it is
not sufficient.
It would be a useful optimization to recent changes monitoring, but not that
important from my perspective (at least, there are much more important issues
to resolve).
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