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Hi,

I like the base idea to trigger scaling based on other information than what we have from the current Ceilometer alarms.

Although I think this functionality should live somewhere else than under the responsibility of Ceilometer. This type of scaling is usually based on trend analysis and other application specific data, which is out of the scope for Ceilometer, even if it has the capability of triggering Heat.

Best Regards,
Ildiko
________________________________________
Feladó: Julien Danjou [julien at danjou.info]
Küldve: 2015. április 29. 9:29
Címzett: ZhiQiang Fan
Másolatot kap: OpenStack Development Mailing List
Tárgy: Re: [openstack-dev] [ceilometer] time based auto scaling

On Wed, Apr 29 2015, ZhiQiang Fan wrote:

> However, current ceilometer only provide time constraint alarm, which will
> only evaluate but not guarantee it will be triggered. And heat cannot
> provide something like timer, but just can wait for the signal.
>
> So I propose to add a new type of alarm, which will definitely send a
> signal to action when it is evaluated (with or without repeat, it will work
> well with time constraint)
>
> Any suggestion?

I've proposed exactly that around 18-24 years go I think during a
summit, and nobody was really interested back then and was worried to
have yet another cron system – though OpenStack didn't have one.

I still think it's a good idea and it will be a nice addition to the
alarming system, so if you want to write a spec for that I'll be all
yours. :)

--
Julien Danjou
# Free Software hacker
# http://julien.danjou.info