Open Stack

Hello Christian,

----- Original Message -----
> From: "Christian Schwede" <christian.schwede at enovance.com>
> To: "OpenStack Development Mailing List (not for usage questions)" <openstack-dev at lists.openstack.org>, "Matthieu
> Huin" <matthieu.huin at enovance.com>
> Sent: Wednesday, January 22, 2014 10:47:24 PM
> Subject: Re: [openstack-dev] [Swift] domain-level quotas
> 
> Hi Matthieu,
> 
> Am 22.01.14 20:02, schrieb Matthieu Huin:
> > The idea is to have a middleware checking a domain's current usage
> > against a limit set in the configuration before allowing an upload.
> > The domain id can be extracted from the token, then used to query
> > keystone for a list of projects belonging to the domain. Swift would
> > then compute the domain usage in a similar fashion as the way it is
> > currently done for accounts, and proceed from there.
> 
> the problem might be to compute the current usage of all accounts within
> a domain. It won't be a problem if you have only a few accounts in a
> domain, but with tens, hundreds or even thousands accounts in a domain
> there will be a performance impact because you need to iterate over all
> accounts (doing a HEAD on every account) and sum up the total usage.

One might object that this is already a concern when applying quotas to potentially huge accounts with lots of containers, although I agree that domains add an order of magnitude to this problem.

> I think some performance tests would be helpful (doing a HEAD on all
> accounts repeatedly with some PUTs in-between) to see if the performance
> impact is an issue at all (since there will be a lot of caching involved).
> 
> Christian
> 

Yes, this is a sound plan. Thanks for the feedback !

Matthieu