[tpop3d-discuss]Re: tpop3d+Exim with hashed maildir directories
dgallagher at starnetusa.net
Tue, 01 Jun 2004 12:05:25 -0500
At 06:00 AM 5/31/2004, email@example.com wrote:
>What we've done here is assign each user their own unique uid, which most
>other places do as well. The hashing scheme we used was as follows:
><some base dir>/<last 2 digits of uid>/<2 digits before the last 2 of the
>This is a little hard to understand, so an example is about the only useful
>way of describing the above.
>Let's say my uid is 500. Using the above hashing method, my maildir spool
>would be at '/var/spool/mail/00/05/uid500/mail/'. If my uid was 32768,
>the maildir would be '.../68/27/uid32768/mail/'. Using some quick math
>calculations and LPAD in MySQL, this hashing scheme was pretty easy to setup.
That's very cool; it limits the number of hashed directories to 100x100,
whilst still scaling (and keeping even distribution) as far up as you
need. How many users have you tested this with?
>One benefit to using the uid is if someone wants to change their username,
>they will still be able to retrieve all of their email that was delivered
>to their old address, without having someone login and move the mail around.
Interesting idea, and a definite advantage. Are the user ID to
username/domain mappings kept on the same machine? If not, how do you deal
with syncing issues?
Dom Gallagher (firstname.lastname@example.org)
StarNet/MegaPOP - http://www.megapop.net
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