From: David Lang (no email)
Date: Fri Jun 08 2007 - 23:45:56 EDT
On Sat, 9 Jun 2007, Rob Mueller wrote:
> So - added is a new option "uuidmode" in imapd.conf. Set it to md5 and you
> will get UUIDs of the form: 02(first 11 bytes of the MD5 value for the
> message) which takes up the same space, but allows pretty good integrity
> checking.
>
> Is it safe? - we calulated that with one billion messages you have a one in
> 1 billion chance of a birthday collision (two random messages with the same
> UUID). They then have to get in the same MAILBOXES collection to sync_client
> to affect each other anyway. The namespace available for generated UUIDs is
> much smaller than this, since they have no collision risk - but if you had
> that many delivering you would hit the limits and start getting blank UUIDs
> anyway.
does the IMAP spec specify how large a UUID can be?
David Lang
---- Cyrus Home Page: http://cyrusimap.web.cmu.edu/ Cyrus Wiki/FAQ: http://cyrusimap.web.cmu.edu/twiki List Archives/Info: http://asg.web.cmu.edu/cyrus/mailing-list.html
|
|
|