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

Vilobh Meshram vilobhmeshram.openstack at gmail.com
Wed May 4 17:23:25 UTC 2016

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
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 Generation-id gives a point in time view of resource usage in a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
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.



[1] Etherpad : https://etherpad.openstack.org/p/newton-quota-library
[2] Slides :

[3] https://review.openstack.org/#/c/283253/
[4] https://launchpad.net/delimiter
[5] Spec : https://review.openstack.org/#/c/284454
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