[openstack-dev] [Openstack-operators] [nova] Default scheduler filters survey

Simon Leinen simon.leinen at switch.ch
Tue May 1 10:56:27 UTC 2018

[Resending for a colleague who's not on openstack-dev-- SL.]

Yeap, because of the bug [#1677217] in the standard
AggregateImagePropertiesIsolation filter, we have written a custom
Nova scheduler filter.

The filter AggregateImageOsDistroIsolation is a simplified version the
AggregateImagePropertiesIsolation, based only on the 'os_distro' image

[#1677217] https://bugs.launchpad.net/nova/+bug/1677217


´╗┐On 29/04/18, 23:29 , "Ed Leafe" <ed at leafe.com> wrote:

>     On Apr 29, 2018, at 1:34 PM, Artom Lifshitz <alifshit at redhat.com> wrote:
>> Based on that, we can definitely say that SameHostFilter and
>> DifferentHostFilter do *not* belong in the defaults. In fact, we got
>> our defaults pretty spot on, based on this admittedly very limited
>> dataset. The only frequently occurring filter that's not in our
>> defaults is AggregateInstanceExtraSpecsFilter.
>     Another data point that might be illuminating is: how many sites
> use a custom (i.e., not in-tree) filter or weigher? One of the
> original design tenets of the scheduler was that we did not want to
> artificially limit what people could use to control their deployments,
> but inside of Nova there is a lot of confusion as to whether anyone is
> using anything but the included filters.
>     So - does anyone out there rely on a filter and/or weigher that they wrote themselves, and maintain outside of OpenStack?
>     -- Ed Leafe
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