[Dovecot] dsync replication errors

[Timo Sirainen]

On 31.1.2013, at 12.27, Oli Schacher <dovecot at lists.wgwh.ch> wrote:

> I'm trying to build a cluster of two servers with dsync replication
> (based on http://wiki2.dovecot.org/Replication). My test setup works
> fine for very simple tests, I can log in to both servers, copy a
> message to one of the servers and it successfully apperars in the other
> account. But, if I try to copy a large amount of messages at once to
> one of the accounts, my maillogs get flodded with errors(see below) and
> the mailboxes seem to get out of sync and messages are duplicated over
> and over again (I originally copied 100 messages and ended up with
> thousands in both mailboxes until I killed dovecot)
..
> Jan 31 10:42:12 doco1 dovecot: doveadm: Error: dsync-remote(user1): Warning: Maildir /mailstore/user1/maildir: Expunged message reappeared, giving a new UID (old uid=72, file=1359625327.M621257P1432.doco1,S=2472,W=2547:2,)

Looks like some bug. Possibilities:

a) Use mdbox format instead of maildir. It works better with dsync.

b) Switch to v2.2 (latest hg version). It has a rewritte dsync that works better.

Ideally do both. :)