Re: Hash collision count

[Jeff Garzik <jgarzik@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