On 07/19/13 at 07:04am, Sean Dague wrote:
On 07/19/2013 06:18 AM, Day, Phil wrote:
Ceilometer is a great project for taking metrics available in Nova and other
systems and making them available for use by Operations, Billing, Monitoring,
etc - and clearly we should try and avoid having multiple collectors of the
same data.
But making the Nova scheduler dependent on Ceilometer seems to be the wrong way
round to me - scheduling is such a fundamental operation that I want Nova to be
self sufficient in this regard. In particular I don't want the availability
of my core compute platform to be constrained by the availability of my (still
evolving) monitoring system.
If Ceilometer can be fed from the data used by the Nova scheduler then that's a
good plus - but not the other way round.
I assume it would gracefully degrade to the existing static
allocators if something went wrong. If not, well that would be very
bad.
Ceilometer is an integrated project in Havana. Utilization based
scheduling would be a new feature. I'm not sure why we think that
duplicating the metrics collectors in new code would be less buggy
than working with Ceilometer. Nova depends on external projects all
the time.
I tend to agree here. It's worth at least doing the due diligence to
see if this is something that could fit into Ceilometer. Or maybe
there's code that can be pulled out of Ceilometer and put into oslo to
hanlde this. It doesn't make sense to duplicate effort if we can take
advantage of already implemented code.
If we have a concern about robustness here, we should be working as
an overall project to address that.
-Sean
--
Sean Dague
http://dague.net
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