[2.3.8] possible replication issue

[Wenger Florian]

I have the same Problem here.
All systems are running Debian 9 amd64.

My dovecot director servers are running 2.3.8, but the Mailbox Servers having sync / replication problems with 2.3.8. So i have downgraded the Mailbox Servers to 2.3.7 and now everything works fine again...

Am 18. Oktober 2019 13:52:37 MESZ schrieb Carsten Rosenberg via dovecot <dovecot at dovecot.org>:
>Hi,
>
>some of our customers have discovered a replication issue after
>upgraded from 2.3.7.2 to 2.3.8.
>
>Running 2.3.8 several replication connections are hanging until defined
>timeout. So after some seconds there are $replication_max_conns hanging
>connections.
>Other replications are running fast and successful.
>
>Also running a doveadm sync tcp:... is working fine for all users.
>
>I can't see exactly, but I haven't seen mailboxes timeouting again and
>again. So I would assume it's not related to the mailbox.
>
>From the logs:
>
>server1:
>Oct 16 08:29:25 server1 dovecot[5715]:
>dsync-local(username1 at domain.com)<FXnVDW22pl0tGAAA1cwDxA>: Error:
>dsync(172.16.0.1): I/O has stalled, no activity for 600 seconds
>(version
>not received)
>Oct 16 08:29:25 server1 dovecot[5715]:
>dsync-local(username1 at domain.com)<FXnVDW22pl0tGAAA1cwDxA>: Error:
>Timeout during state=master_recv_handshake
>
>server2:
>
>Oct 16 08:29:25 server2 dovecot[8113]: doveadm: Error: read(server1)
>failed: EOF (last sent=handshake, last recv=handshake)
>
>There aren't any additional logs regarding the replication.
>
>I have tried increasing vsz_limit or reducing replication_max_conns.
>Nothing changed.
>
>--
>
>Both customers have 10k+ users. Currently I couldn't reproduce this on
>smaller test systems.
>
>Both installation were downgraded to 2.3.7.2 to fix the issue for now
>
>--
>
>I've attached a tcpdump showing the client showing the client stops
>sending any data after the mailbox_guid table headers.
>
>
>
>Any idea what could be wrong here or the debug this issue?
>
>Thanks.
>
>Carsten Rosenberg

-- 
Diese Nachricht wurde von meinem Android-Gerät mit K-9 Mail gesendet.
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <https://dovecot.org/pipermail/dovecot/attachments/20191018/2af19c3f/attachment.html>