On Mon, 2007-11-12 at 20:07 +0200, Timo Sirainen wrote:
On Mon, 2007-11-12 at 16:27 +0000, Daniel Watts wrote:
SQL backend has been possible for a long time and there's already a kind-of working version available:
Hey that's cool - didn't realise this was available . Timo what is your own opinion of sql based mail storage vs maildir (or dbox)? When is it a good idea?
I don't really know. Maybe if you want to use the mail database for something special. Performance definitely isn't a reason.
I'm not sure if this would allow multi-master replication though. I know MySQL offers support for it, but what happens when both masters have added a row that causes a unique key collision? Can you write triggers to fix those cases automatically?
It's taken care of in Mysql 5.0. There's a couple settings: auto_increment_increment = 10 auto_increment_offset = 1 auto_increment_offset = 2 (for other master)
to keep keys assigned by the servers from colliding. Here's a link I was just checking out today.. http://capttofu.livejournal.com/1752.html?view=20440#t20440
If mail-sql was efficient, I'd love to go that route - imagine disaster recovery, or even geographical load balancing, being as easy as adding another replication master....
Rick