[Building Sakai] James configuration

[Thomas Amsler]

We have the exact same problem and spent some time figuring out the
source of this issue.

We simulated various load and usage scenarios but were never able to
reproduce this issue. By reading up on the Apache James email
archives, it's highly recommended to upgrade to the latest version
which is v2.3.1 and Sakai is using v2.1.3.

Our current solution is that one node is handling all the mail. That
node doesn't allow any user connections so that we can restart that
sakai instance as soon as our monitoring script detects the "Maximum
number of open connections ..." problem.

We have some of this documented here:
https://confluence.ucdavis.edu/confluence/x/KYC3

Best,
-- Thomas




On Tue, Mar 24, 2009 at 4:42 AM, Daniel Merino
<daniel.merino at unavarra.es> wrote:
> Hi all.
>
> We have problems with James. Sometimes the mailarchive stops working and it
> gives us the next error in the logs:
>
> 24/03/09 12:34:55 WARN  connections: Maximum number of open connections
> exceeded - refusing connection.  Current number of connections is 30
>
> In the file
> /home/sinfo/sakai_2-5-3/mailarchive/mailarchive-james/james/src/webapp/apps/james/SAR-INF/config.xml
> we have 30 connections allowed.
>
> <connections>
>       <idle-timeout>300000</idle-timeout>
>       <max-connections>30</max-connections>
>    </connections>
>
> We don't know if maybe this is a low value for the number of connections or
> if James doesn't free properly these connections.
>
> Could somebody tell me how can we configurate correctly this parameter?
> Thanks in advance.
> --
> Daniel Merino
> daniel.merino at unavarra.es
> Gestor de teleformación - Centro Superior de Innovación Educativa.
> Tfno: 948-168489 - Universidad Pública de Navarra.
> --
> Cualquier idiota puede decir la verdad, pero para mentir hace falta tener
> imaginación. (Perich)
>
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