dovecot - Jun 2017 - imapc making too any connections

Hi,

I was testing around with 2.2.31, and saw that it made new extra connections to
the backend imap server whenever you make a new mailbox.
So client does:

A001 login username password
A002 create subfolder

Previously, dovecot would just send the create command to the backend, but now
does (including connection IDs):

[conn1] 9 CREATE "subfolder"
[conn1] 10 EXAMINE "INBOX"
[conn2] 12 LOGIN "username" "password"
[conn2] 11 SELECT "subfolder"

The new EXAMINE Command is a bit weird, but the secondary connection is a
complete waste. I also haven't seen any other action on it yet, but it's
kept around. If you make more mailboxes, every time you gain an extra connection
from dovecot to the backend imap server. And they all stick around. I don't
know which changes this behavior triggered, there were loads of imapc fixes the
last couple of releases.

John

On 29 Jun 2017, at 18.44, van der Kamp, John <jkamp at amazon.nl>
wrote:
> 
> Hi,
> 
> I was testing around with 2.2.31, and saw that it made new extra
connections to the backend imap server whenever you make a new mailbox.
> So client does:
> 
> A001 login username password
> A002 create subfolder
> 
> Previously, dovecot would just send the create command to the backend, but
now does (including connection IDs):
> 
> [conn1] 9 CREATE "subfolder"
> [conn1] 10 EXAMINE "INBOX"
> [conn2] 12 LOGIN "username" "password"
> [conn2] 11 SELECT "subfolder"
> 
> The new EXAMINE Command is a bit weird, but the secondary connection is a
complete waste. I also haven't seen any other action on it yet, but it's
kept around. If you make more mailboxes, every time you gain an extra connection
from dovecot to the backend imap server. And they all stick around. I don't
know which changes this behavior triggered, there were loads of imapc fixes the
last couple of releases.
It's caused by
https://github.com/dovecot/core/commit/444e2d726b0c351e28888b10a9593426ad5c4d53
<https://github.com/dovecot/core/commit/444e2d726b0c351e28888b10a9593426ad5c4d53>
- completely different from what I guessed..