so FYI, in case people missing this spec, there is spec from John

the roadmap of this spec is also saying deprecate the quota-class API.

melanie witt <> 于2018年10月25日周四 上午3:54写道:

> On Wed, 24 Oct 2018 13:57:05 -0500, Matt Riedemann wrote:
> > On 10/24/2018 10:10 AM, Jay Pipes wrote:
> >> I'd like to propose deprecating this API and getting rid of this
> >> functionality since it conflicts with the new Keystone /limits endpoint,
> >> is highly coupled with RAX's turnstile middleware and I can't seem to
> >> find anyone who has ever used it. Deprecating this API and functionality
> >> would make the transition to a saner quota management system much easier
> >> and straightforward.
> > I was trying to do this before it was cool:
> >
> >
> >
> > I think it was the Pike PTG in ATL where people said, "meh, let's just
> > wait for unified limits from keystone and let this rot on the vine".
> >
> > I'd be happy to restore and update that spec.
> Yeah, we were thinking the presence of the API and code isn't harming
> anything and sometimes we talk about situations where we could use them.
> Quota classes come up occasionally whenever we talk about preemptible
> instances. Example: we could create and use a quota class "preemptible"
> and decorate preemptible flavors with that quota_class in order to give
> them unlimited quota. There's also talk of quota classes in the "Count
> quota based on resource class" spec [1] where we could have leveraged
> quota classes to create and enforce quota limits per custom resource
> class. But I think the consensus there was to hold off on quota by
> custom resource class until we migrate to unified limits and oslo.limit.
> So, I think my concern in removing the internal code that is capable of
> enforcing quota limit per quota class is the preemptible instance use
> case. I don't have my mind wrapped around if/how we could solve it using
> unified limits yet.
> And I was just thinking, if we added a project_id column to the
> quota_classes table and correspondingly added it to the
> os-quota-class-sets API, we could pretty simply implement quota by
> flavor, which is a feature operators like Oath need. An operator could
> create a quota class limit per project_id and then decorate flavors with
> quota_class to enforce them per flavor.
> I recognize that maybe it would be too confusing to solve use cases with
> quota classes given that we're going to migrate to united limits. At the
> same time, I'm hesitant to close the door on a possibility before we
> have some idea about how we'll solve them without quota classes. Has
> anyone thought about how we can solve the use cases with unified limits
> for things like preemptible instances and quota by flavor?
> Cheers,
> -melanie
> [1]
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