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Re: svn commit: r1515088 - in /subversion/branches/log-addressing/subversion: include/private/svn_subr_private.h include/svn_checksum.h libsvn_subr/checksum.c libsvn_subr/fnv1a.c libsvn_subr/fnv1a.h tests/libsvn_subr/checksum-test.c

From: Branko Čibej <brane_at_wandisco.com>
Date: Sun, 18 Aug 2013 14:25:54 +0200

On 18.08.2013 14:15, stefan2_at_apache.org wrote:
> Author: stefan2
> Date: Sun Aug 18 12:15:01 2013
> New Revision: 1515088
>
> URL: http://svn.apache.org/r1515088
> Log:
> On the log-addressing branch: For low-overhead checksumming,
> add standard FNV-1a and a faster modified version of that to
> the list of checksum kinds supported with svn_checksum_t.
>
> We will use this new checksum to secure parts of FSFS (and
> later FSX) that are not directly covered by MD5/SHA1 content
> checksums. That will help to localize corruptions much quicker
> and more accurately but it will not eliminate the need to run
> a full content verification.

If you're using this for detecting corruption, rather than key
distribution, why not instead use a 64-bit or even 32-bit CRC? It should
be much faster than any kind of multiply-with-prime hash.

-- Brane

-- 
Branko Čibej | Director of Subversion
WANdisco // Non-Stop Data
e. brane_at_wandisco.com
Received on 2013-08-18 14:26:31 CEST

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