[openstack-dev] [nova][limits] Does ANYONE at all use the quota class functionality in Nova?

Jay Pipes jaypipes at gmail.com
Fri Oct 26 13:55:00 UTC 2018

On 10/25/2018 02:44 PM, melanie witt wrote:
> On Thu, 25 Oct 2018 14:00:08 -0400, Jay Pipes wrote:
>> On 10/25/2018 01:38 PM, Chris Friesen wrote:
>>> On 10/24/2018 9:10 AM, Jay Pipes wrote:
>>>> Nova's API has the ability to create "quota classes", which are
>>>> basically limits for a set of resource types. There is something
>>>> called the "default quota class" which corresponds to the limits in
>>>> the CONF.quota section. Quota classes are basically templates of
>>>> limits to be applied if the calling project doesn't have any stored
>>>> project-specific limits.
>>>> Has anyone ever created a quota class that is different from "default"?
>>> The Compute API specifically says:
>>> "Only ‘default’ quota class is valid and used to set the default quotas,
>>> all other quota class would not be used anywhere."
>>> What this API does provide is the ability to set new default quotas for
>>> *all* projects at once rather than individually specifying new defaults
>>> for each project.
>> It's a "defaults template", yes.
>> The alternative is, you know, to just set the default values in
>> CONF.quota, which is what I said above. Or, if you want project X to
>> have different quota limits from those CONF-driven defaults, then set
>> the quotas for the project to some different values via the
>> os-quota-sets API (or better yet, just use Keystone's /limits API when
>> we write the "limits driver" into Nova). The issue is that the
>> os-quota-classes API is currently blocking *me* writing that "limits
>> driver" in Nova because I don't want to port nova-specific functionality
>> (like quota classes) to a limits driver when the Keystone /limits
>> endpoint doesn't have that functionality and nobody I know of has ever
>> used it.
> When you say it's blocking you from writing the "limits driver" in nova, 
> are you saying you're picking up John's unified limits spec [1]? It's 
> been in -W mode and hasn't been updated in 4 weeks. In the spec, 
> migration from quota classes => registered limits and deprecation of the 
> existing quota API and quota classes is described.
> Cheers,
> -melanie
> [1] https://review.openstack.org/602201

Actually, I wasn't familiar with John's spec. I'll review it today.

I was referring to my own attempts to clean up the quota system and 
remove all the limits-related methods from the QuotaDriver class...


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