I implemented a couple of larger director changes today. These could still be
changed a bit if somebody has any ideas.
http://hg.dovecot.org/dovecot-2.2/rev/b9df3d654710
Support for director "tags", which allow creating multiple Dovecot
backend groups using a single director ring. So you can mark different backend
hosts with @tag names and then have passdb lookup return the wanted tag for each
user. Note that because director works using user hashes, two users with the
same hash can't be in different backend groups. Use "doveadm director
map -u user at domain" to see which hash is used by the user at domain.
http://hg.dovecot.org/dovecot-2.2/rev/b9df3d654710
Added director_consistent_hashing=yes setting so users don't move around
much when backend servers are added/removed. Ideally at some point this setting
will be removed and directors will automatically switch to it when all the
directors in the ring support it.
