[openstack-dev] [cross-project][quotas][delimiter] Austin Summit - Design Session Summary

Tim Bell Tim.Bell at cern.ch
Wed May 4 18:09:44 UTC 2016

On 04/05/16 19:41, "Nikhil Komawar" <nik.komawar at gmail.com> wrote:

>Thanks for the summary and taking care of the setup, Vilobh!
>Pretty meticulously written on what was agreed at the session. Kudos!
>I wanted to add some points that were asked during the Glance
>contributors' meetup:
>* The quota limits will be set on the tables in the service that
>maintains the resources for each individual resource (not in keystone).
>The default value is what is picked from the config. I think over time
>we will come up with implementation detail on how the hierarchical
>default value should be set.
>* The quota allocation calculation will be based on the project
>hierarchy in consideration (given that driver is being used in such
>deployment scenario) and the usage for that resource recorded in the
>resource's quota table in that service. So, this will involve
>interaction with keystone and within the quota table in the project.
>* We will be working on a migration story separately (outside of the
>library). Delimiter does not own the quota limits and usage data so it
>will not deal with migrations.

Given that Glance does not currently have a quota, it may be possible to use this as the initial implementation. This would also avoid a later migration effort.


>On 5/4/16 1:23 PM, Vilobh Meshram wrote:
>> Hi All,
>> For people who missed the design summit session on Delimiter - Cross
>> project Quota enforcement library here is a gist of what we discussed.
>> Etherpad [1] captures the details. 
>> 1. Delimiter will not be responsible for rate-limiting.
>> 2. Delimiter will not maintain data for the projects.
>> 3. Delimiter will not have the concept of reservations.
>> 4. Delimiter will fetch information for project quotas from respective
>> projects.
>> 5. Delimiter will consolidate utility code for quota related issues at
>> common place. For example X, Y, Z companies might have different
>> scripts to fix quota issues. Delimiter can be a single place for it
>> and the scripts can be more generalized to suit everyones needs.
>> 6. The details of project hierarchy is maintained in Keystone but
>> Delimiter while making calculations for available/free resource will
>> take into consideration whether the project has flat or nested hierarchy.
>> 7. Delimiter will rely on the concept of generation-id to guarantee
>> sequencing. Generation-id gives a point in time view of resource usage
>> in a project. Project consuming delimiter will need to provide this
>> information while checking or consuming quota. At present Nova [3] has
>> the concept of generation-id.
>> 8. Spec [5] will be modified based on the design summit discussion.
>> If you want to contribute to Delimiter, please join *#openstack-quota. *
>> We have *meetings every Tuesday at 17:00 UTC. *Please join us !
>> *
>> *
>> I am in the process of setting up a new repo for Delimiter. The
>> launchpad page[4] is up.
>> Thanks!
>> -Vilobh
>> [1] Etherpad : https://etherpad.openstack.org/p/newton-quota-library
>> [2] Slides
>> : http://www.slideshare.net/vilobh/delimiter-openstack-cross-project-quota-library-proposal 
>> [3] https://review.openstack.org/#/c/283253/
>> [4] https://launchpad.net/delimiter
>> [5] Spec : https://review.openstack.org/#/c/284454
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