[openstack-dev] [nova] Let's kill quota classes (again)

Matt Riedemann mriedem at linux.vnet.ibm.com
Thu Dec 15 14:00:00 UTC 2016

On 12/15/2016 3:11 AM, Andrey Volkov wrote:
> Hi,
> I totally agree with Matt than `os-quota-class-sets` is inconsistent.
> It has that hardcoded default class can't be changed.
> API call is documented neither Nova nor Cinder (has the same API for
> quotas).
> With defaults in the configuration I have some concerns:
> - As it was mentioned before, possibly we need to update configs in
> several places.

We're moving quotas to the API and we're going to stop doing the 
reservation/commit/rollback race dance between API and compute nodes per 
this spec:


So that would mean you really only need the default quota configuration 
on the API node, so I don't think this is as much of a problem after 
that change.

> - To make changes be applied we need to restart service, possibly SIGHUP
> can help
>   but I'm not sure.

I'd think we could make these mutable config options so we could pickup 
the changes without restarting the service.

> Alternatives I see are:
> - Update `os-quota-sets` and give it possibility to work with defaults.
> - Use external centralized quota service on which the work's doing actively.
>   Please see [1] spec for limits in keystone and doc [2] having information
>   how it can be applied in Nova and Cinder.
> [1] https://review.openstack.org/#/c/363765/
> [2]
> https://docs.google.com/document/d/1AqmmRvd_e-4Hw2oLbnBf5jBtjLgMj-kqAaQfofp_NYI/edit#



Matt Riedemann

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