Solved: replication-/sync-problem with 'percent'-sign in foldernames after upgrade to dovecot 2.3.19

[Andreas Piper]

Hello,

solved:

the problem seems to be caused by the following change noted in the 
release-notes for 2.3.19:
- doveadm sync: BROKENCHAR was wrongly changed to '_' character when
   migrating mailboxes. This was set by default to %, so any mailbox
   names containing % characters were modified to "_25".

After explicitely defining '%' as brokenchar, replication from the 
command-line now works without problem and the 
replication-'failed'-count has returned to 0.

The solution is to define
'mail_location = mdbox:%h/mdbox:BROKENCHAR=\%'

Andreas

Am 18.05.22 um 14:23 schrieb Andreas Piper:
> Hello,
> 
> after upgrading my two replicator-hosts from 2.3.18 to 2.3.19, I observe 
> 'failed replication'-counts with "dovecot replicator status".
> 
> The failure seems to be linked to foldernames containing a 
> 'percent'-sign ('%'):
> 
> "dovecot replicator status '*' | grep ' y'" now lists some users, who 
> are permanently marked as 'failed'.
> 
> Trying to resync one of these users ('username') with
> 
> "doveadm -D sync -u username -d -n INBOX -l 30 -U"
> 
> stops with output:
> 
> "May 18 13:29:34 doveadm(username)<84718><TBlBD5fYhGLuSgEAZZgj0g>: 
> Warning: Mailbox changes caused a desync. You may want to run dsync 
> again: Mailbox  AG Servicedesk/Krankmeldungen -Hiwis/krank/30%25 
> mailbox_rename conflict: Can't rename mailbox to itself."
> 
> "doveadm mailbox list -u username | grep '%'" for this user shows indeed 
> a folder named "AG Servicedesk/Krankmeldungen -Hiwis/krank/30%".
> 
> For the other failed users resyncing stops at equivalent foldernames 
> containing a 'percent'-sign.
> 
> There are no errors or warnings noted in the logs and the replication 
> for these users seems still to be working, as the total mailbox-size of 
> the users is always identical on both replicators and mailbox-changes 
> are noted in the logs.
> 
> Are there any ideas how to solve this?
> 
> Systemparameters are:
> 
> # 2.3.19 (b3ad6004dc): /etc/dovecot/dovecot.conf
> # Pigeonhole version 0.5.19 (4eae2f79)
> # OS: Linux 4.15.0-177-generic x86_64 Ubuntu 18.04.6 LTS
> 
> Mailbox-Storage is on local ZFS
> 
> Further information can be provided if needed.
> 
> With many thanks for any help,
> Andreas

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