[openstack-dev] [Nova] Ceilometer vs. Nova internal metrics collector for scheduling

Sean Dague sean at dague.net
Fri Jul 19 15:30:54 UTC 2013

On 07/19/2013 10:37 AM, Murray, Paul (HP Cloud Services) wrote:
> If we agree that "something like capabilities" should go through Nova, what do you suggest should be done with the change that sparked this debate: https://review.openstack.org/#/c/35760/
> I would be happy to use it or a modified version.

CPU sys, user, idle, iowait time isn't capabilities though. That's a 
dynamically changing value. I also think the current approach where this 
is point in time sampling, because we only keep a single value, is going 
to cause some oddly pathologic behavior if you try to use it as 
scheduling criteria.

I'd really appreciate the views of more nova core folks on this thread, 
as it looks like these blueprints have seen pretty minimal code review 
at this point. H3 isn't that far away, and there is a lot of high 
priority things ahead of this, and only so much coffee and review time 
in a day.


Sean Dague

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