Re: Instances restarting on a schedule - or not
Re: Instances restarting on a schedule - or not
- Subject: Re: Instances restarting on a schedule - or not
- From: Chuck Hill <email@hidden>
- Date: Thu, 09 Aug 2012 15:35:55 -0700
On 2012-08-09, at 2:40 PM, Klaus Berkling wrote:
> Occasionally I write something useful, for someone - herding sheep on the grassy, rolling hills of the island. :-)
Goats, man, goats! Sheep..... sheesh!
:-P
> For the archives:
>
> The way instances roll-over is when
> - the wotaskd daemon tells the instance to stop accepting connections/sessions, based on a schedule
> - the app instance is to quit when it reaches 0 sessions (this is a configuration, you call tell it to terminate at x number of sessions)
> - the auto-recover flag tells wotaskd to start the instance again
>
> Doing this gracefully allows sessions to be finished by the end users. There is an option to do this not gracefully, in which case the instances is unceremoniously terminated.
>
> Sometimes instances don’t quit on their own. This looks like the image below. 'Refuse New Sessions' is on, and ‘Auto-Recover' is on, and the instance is still running. Something is hung - ether a thread or a sessions refuses to time-out. This is a bug in the app's code. The instance can’t quit on its own.
>
> The indicators/buttons are yellow because these flags are assumed and disabled when scheduling is enabled.
>
> There will be a ‘No Instances Available’ error page if there are no other instances accepting connections.
>
> <Screen Shot 2012-08-09 at 1.42.46 PM.png>
>
> http://www.berkling.us/theothersite/page1/files/wo_instances_restarting.html
>
>
> kib
>
> "The trouble with normal is it always gets worse."
> Bruce Cockburn
>
> Klaus Berkling
> Web Application Dev. & Systems Analyst
> DynEd International, Inc.
> www.dyned.com
>
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--
Chuck Hill Senior Consultant / VP Development
Practical WebObjects - for developers who want to increase their overall knowledge of WebObjects or who are trying to solve specific problems.
http://www.global-village.net/gvc/practical_webobjects
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