Replication Troubles

[Timo Sirainen]

On 17 Feb 2017, at 21.37, Wolfgang Hennerbichler <wogri at wogri.com> wrote:
> 
> Hi Dovecot Users, 
> 
> I’ve configured dovecot dsync replication and I see troubles in the logs and get user complaints which I can’t explain. I found similar threads on this mailinglist, but I couldn’t find a solution anywhere. Does anybody have dsync running without problems on a high volume mailserver?
> 
> I see the following logs, examples given: 
> 
> Feb 17 18:16:49 dovecot dovecot: imap(zoechi): Warning: /var/mail/zoechi/dovecot-uidlist: Duplicate file entry at line 10395: 1487350019.M138380P28563.dovecot.wogri.at,S=18930,W=19377 (uid 41092 -> 41093) - retrying by re-reading from beginning
> 
> with this one I’m not sure - it might be that this is completely OK because due to replication UIDs clash. Maybe that’s OK, but I couldn’t find a confirmation. 
> 
> Feb 17 18:16:49 dovecot dovecot: imap(zoechi): Warning: Maildir /var/mail/zoechi: Expunged message reappeared, giving a new UID (old uid=41092, file=1487350019.M138380P28563.dovecot.wogri.at,S=18930,W=19377)

There seems to be something weird with using Maildir and replication. Haven't had time to debug it and it's likely not an easy bug to fix, so for now the solution would be to use only sdbox/mdbox with replication.