Hello, I'm using dovecot 2.3.10 in OpenSUSE and I have configured a master/master replication between two backends, it works well but I have found an issue with the replication of the HIGHESTMODSEQ. When I move a set of message from a mailbox to other, e.g. move 3 messages from INBOX to Junk, the HIGHESTMODSEQ get different on each server, with no errors in the log: [Borrador] 34:34 [Sent] 63:63 [Drafts] 12:12 [Trash] 146:146 [Junk] 219:218 [INBOX] 1133:1130 It can be fixed executing a full sync: $ sudo doveadm -D -v sync -u user at test.priv -d -l 30 -U But it is not a solution because it happens all the time that a user move messages. I'm using ActiveSync and the ActiveSync server use the HIGHESTMODSEQ as part of the synchronization key (sync_key), so in that situation the server detect changes on the mailbox if it connects to the backend with a different HIGHESTMODSEQ that it previously cached, causing a loop beetween the ActiveSync server and the the email client, where the server constantly inform email client about nonexistent changes. Could it be a bug in Dovecot replication? How can I solve it? Best regards, Gustavo Ajeitos
Hello again, ??? Any help with this will be very appreciated. Thank you in advance. Gustavo Ajeitos El 9/10/20 a las 16:17, Gustavo Ajeitos escribi?:> Hello, > > I'm using dovecot 2.3.10 in OpenSUSE and I have configured a > master/master replication between two backends, it works well but I > have found an issue with the replication of the HIGHESTMODSEQ. > When I move a set of message from a mailbox to other, e.g. move 3 > messages from INBOX to Junk, the HIGHESTMODSEQ get different on each > server, with no errors in the log: > > [Borrador] 34:34 > [Sent] 63:63 > [Drafts] 12:12 > [Trash] 146:146 > [Junk] 219:218 > [INBOX] 1133:1130 > > It can be fixed executing a full sync: > $ sudo doveadm -D -v sync -u user at test.priv -d -l 30 -U > > But it is not a solution because it happens all the time that a user > move messages. > > I'm using ActiveSync and the ActiveSync server use the HIGHESTMODSEQ > as part of the synchronization key (sync_key), so in that situation > the server detect changes on the mailbox if it connects to the backend > with a different HIGHESTMODSEQ that it previously cached, causing a > loop beetween the ActiveSync server and the the email client, where > the server constantly inform email client about nonexistent changes. > > Could it be a bug in Dovecot replication? How can I solve it? > > Best regards, > Gustavo Ajeitos >
On 09/10/2020 21:17, Gustavo Ajeitos [Office365] wrote:> Hello, > > I'm using dovecot 2.3.10 in OpenSUSE and I have configured a > master/master replication between two backends, it works well but I > have found an issue with the replication of the HIGHESTMODSEQ. > When I move a set of message from a mailbox to other, e.g. move 3 > messages from INBOX to Junk, the HIGHESTMODSEQ get different on each > server, with no errors in the log: > > [Borrador] 34:34 > [Sent] 63:63 > [Drafts] 12:12 > [Trash] 146:146 > [Junk] 219:218 > [INBOX] 1133:1130 > > It can be fixed executing a full sync: > $ sudo doveadm -D -v sync -u user at test.priv -d -l 30 -U > > But it is not a solution because it happens all the time that a user > move messages. > > I'm using ActiveSync and the ActiveSync server use the HIGHESTMODSEQ > as part of the synchronization key (sync_key), so in that situation > the server detect changes on the mailbox if it connects to the backend > with a different HIGHESTMODSEQ that it previously cached, causing a > loop beetween the ActiveSync server and the the email client, where > the server constantly inform email client about nonexistent changes. > > Could it be a bug in Dovecot replication? How can I solve it? > > Best regards, > Gustavo Ajeitos >Hi Gustavo I don't know if this is a bug, but one thing I noticed is that for master/master replication the recommendation is to have specific users always directed to the same server. If you implemented this recommendation for the ActiveSync connections, would that solve the problem? John
Hi John, ??? Thank you for your answer! I agree with you, I think you recommendation should solve the problem, it seems the only possible workaround. I have to investigate if it possible and how to accomplish that with the load balancer. Gustavo El 3/11/20 a las 15:27, John Fawcett escribi?:> On 09/10/2020 21:17, Gustavo Ajeitos [Office365] wrote: >> Hello, >> >> I'm using dovecot 2.3.10 in OpenSUSE and I have configured a >> master/master replication between two backends, it works well but I >> have found an issue with the replication of the HIGHESTMODSEQ. >> When I move a set of message from a mailbox to other, e.g. move 3 >> messages from INBOX to Junk, the HIGHESTMODSEQ get different on each >> server, with no errors in the log: >> >> [Borrador] 34:34 >> [Sent] 63:63 >> [Drafts] 12:12 >> [Trash] 146:146 >> [Junk] 219:218 >> [INBOX] 1133:1130 >> >> It can be fixed executing a full sync: >> $ sudo doveadm -D -v sync -u user at test.priv -d -l 30 -U >> >> But it is not a solution because it happens all the time that a user >> move messages. >> >> I'm using ActiveSync and the ActiveSync server use the HIGHESTMODSEQ >> as part of the synchronization key (sync_key), so in that situation >> the server detect changes on the mailbox if it connects to the backend >> with a different HIGHESTMODSEQ that it previously cached, causing a >> loop beetween the ActiveSync server and the the email client, where >> the server constantly inform email client about nonexistent changes. >> >> Could it be a bug in Dovecot replication? How can I solve it? >> >> Best regards, >> Gustavo Ajeitos >> > Hi Gustavo > > I don't know if this is a bug, but one thing I noticed is that for > master/master replication the recommendation is to have specific users > always directed to the same server. If you implemented this > recommendation for the ActiveSync connections, would that solve the problem? > > John >