From: Jeff Garzik <jgarzik@pobox.com>
To: Git Mailing List <git@vger.kernel.org>,
Linus Torvalds <torvalds@osdl.org>
Subject: Re: Hash collision count
Date: Sat, 23 Apr 2005 16:33:19 -0400 [thread overview]
Message-ID: <426AB10F.9050300@pobox.com> (raw)
In-Reply-To: <426AAFC3.800@pobox.com>
Jeff Garzik wrote:
>
> Ideally a hash + collision-count pair would make the best key, rather
> than just hash alone.
>
> A collision -will- occur eventually, and it is trivial to avoid this
> problem:
>
> $n = 0
> attempt to store as $hash-$n
> if $hash-$n exists (unlikely)
> $n++
> goto restart
> key = $hash-$n
This of course presumes that you know that your new data does not exist
in the cache.
Otherwise, you would need to hash the on-disk $hash-0 to determine if
its a collision or a reference.
Jeff
next prev parent reply other threads:[~2005-04-23 20:28 UTC|newest]
Thread overview: 15+ messages / expand[flat|nested] mbox.gz Atom feed top
2005-04-23 20:27 Hash collision count Jeff Garzik
2005-04-23 20:33 ` Jeff Garzik [this message]
2005-04-23 23:00 ` Ray Heasman
2005-04-23 23:20 ` Jeff Garzik
2005-04-23 23:46 ` Petr Baudis
2005-04-24 0:35 ` Jeff Garzik
2005-04-24 0:40 ` Petr Baudis
2005-04-24 0:43 ` Jeff Garzik
2005-04-24 21:24 ` Imre Simon
2005-04-24 22:25 ` Whales falling on houses - was: " Jon Seymour
2005-04-25 23:50 ` Tom Lord
2005-04-26 0:00 ` Petr Baudis
2005-04-24 1:01 ` Ray Heasman
2005-04-24 7:56 ` David Lang
-- strict thread matches above, loose matches on Subject: below --
2005-04-24 23:16 linux
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