Hello, upgrading to 2.3.9 unfortunately does *not* solve this issue:
I upgraded one of my replicators from 2.3.7.2 to 2.3.9 and after some seconds replication stopped. The other replicator remained with 2.3.7.2. After downgrading to 2.3.7.2 replication is again working fine.
I did not try to upgrade both replicators up to now, as this is a live production system. Is there a chance, that upgrading both replicators will solve the problem?
The machines are running Ubuntu 18.04 Any help is appreciated. Thanks, Andreas Am 18.10.19 um 13:52 schrieb Carsten Rosenberg via dovecot:
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(userna...@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(userna...@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
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Dr. Andreas Piper, Hochschulrechenzentrum der Philipps-Univ. Marburg
Hans-Meerwein-Straße 6, 35032 Marburg, Germany
Phone: +49 6421 28-23521 Fax: -26994 E-Mail: pi...@hrz.uni-marburg.de
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