Re: Director keeping IMAP connections alive

[Webert de Souza Lima]

Such connections do not exist on the front-end that connects to director
hosts, so it's something between director and dovecot only.

On Wed, Sep 21, 2016 at 1:16 PM, Webert de Souza Lima  wrote:

> Hello,
>
> I have a 2 director - 2 dovecot set up in a cluster.
>
> From time to time I notice high usage of RAM by dovecot process, and
> analyzing with doveadm who,
> I see many users with dozens, even hundreds of PIDs.
>
> Inspecting those PIDs I see each one of them is an IMAP connection, coming
> from either director process, and ESTABILISHED.
>
> A deeper analysis shows me that there ltos of connections from the same
> users to BOTH dovecot instances, but as I am using director, this shouldn't
> happen, right? Ok. The thing is, one of the dovecot instances have only old
> connections (like 3 days old) and the other dovecot have some old and some
> newer connections.
>
> So, director is redirecting recent connections to the right dovecot, as
> expected, but it is keeping many of old and unused connections open,
> consuming resources.
>
> output of doveconf -n from dovecot:
> http://pastebin.com/trMEjeAs
>
> output of doveconf -n from director:
> http://pastebin.com/EUpHYMKY
>
> Thanks.
>

Director keeping IMAP connections alive

[Webert de Souza Lima]

Hello,

I have a 2 director - 2 dovecot set up in a cluster.

>From time to time I notice high usage of RAM by dovecot process, and
analyzing with doveadm who,
I see many users with dozens, even hundreds of PIDs.

Inspecting those PIDs I see each one of them is an IMAP connection, coming
from either director process, and ESTABILISHED.

A deeper analysis shows me that there ltos of connections from the same
users to BOTH dovecot instances, but as I am using director, this shouldn't
happen, right? Ok. The thing is, one of the dovecot instances have only old
connections (like 3 days old) and the other dovecot have some old and some
newer connections.

So, director is redirecting recent connections to the right dovecot, as
expected, but it is keeping many of old and unused connections open,
consuming resources.

output of doveconf -n from dovecot:
http://pastebin.com/trMEjeAs

output of doveconf -n from director:
http://pastebin.com/EUpHYMKY

Thanks.