Date: Sun, 3 Oct 2004 11:03:49 -0300 (ADT)
From: "Marc G. Fournier" <scrappy@postgresql.org>
To: Peter Eisentraut <peter_e@gmx.net>
Cc: Dave Page <dpage@vale-housing.co.uk>,
	John Hansen <john@geeknet.com.au>, Devrim GUNDUZ <devrim@gunduz.org>,
	PostgreSQL WWW Mailing List <pgsql-www@postgresql.org>
Subject: Re: Problem with mirrorring
In-Reply-To: <200410031325.14847.peter_e@gmx.net>
Message-ID: <20041003110250.D96717@ganymede.hub.org>
References: 
 <E7F85A1B5FF8D44C8A1AF6885BC9A0E407B40D@ratbert.vale-housing.co.uk>
	<200410031325.14847.peter_e@gmx.net>
MIME-Version: 1.0
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On Sun, 3 Oct 2004, Peter Eisentraut wrote:

> Dave Page wrote:
>> Of course, how it does that is a mystery to me - without fully
>> comparing both versions, how can it create a diff? I guess that's
>> what made it PhD material...
>
> It doesn't create a diff.  It computes checksums for pieces of the file
> and transfers those.
>
> Apparently, though, it first checks the modification time before doing
> all that checksum stuff.

Right, and if you want, you can use the --size-only arg to rsync to 
disable the timestamp check and made it only a size check ... so, if the 
size doesn't change, the page wasn't actually modified ... and, I can't 
think of many situations where if hte file changed, the size wouldn't 
change by *at least* one character, but I imagine it could happen ...

----
Marc G. Fournier           Hub.Org Networking Services (http://www.hub.org)
Email: scrappy@hub.org           Yahoo!: yscrappy              ICQ: 7615664