Delimiter - OpenStack Cross Project Quota Library Proposal
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The document discusses the need for a cross-project quota library in OpenStack. Currently each project enforces quotas individually, leading to duplicated code and issues with concurrency and transactions. The proposed Delimiter library would consolidate common quota code and functionality while allowing projects to maintain their own resource data. The library would impose restrictions on resource consumption but not handle rate limiting, reservations, or storing resource data itself.
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Delimiter - OpenStack Cross Project Quota Library Proposal
- 1. 1
- 2. Delimiter – Cross Project Quota Library Vilobh Meshram, Joshua Harlow, Nikhil Komawar
- 3. 3 What is Quota ? Quota helps to enforce restriction on resource consumption.
- 4. 4 Projects and Resources Nova CPU, Memory, Disk, #Instances Cinder Volumes, Snapshots, Gigabytes Neutron Port, Subnet, Router, Network Magnum Trove
- 5. 5 Why? • Every project has its own way of enforcing Quotas. • Similar pattern for Quota code in projects using Quota. • Duplication of efforts. • Time consumed in developing Quota features. • Concurrency and Transactional Issues in current design. • Crucial to keep track of resource limits.
- 6. 6 State of Quota across different projects • TOP CONCERNS in every Dev-Ops Summit. • How to Refresh Quota ? • How to reset in-correct quota count ?
- 7. 7 State of Quota Enhancement efforts Discussion on Quota at Design Summit (or Mid cycle for respective projects) Propose a spec or solution. Realize Quotas are broken and will need significant investment to get it right. Service v/s Library debate. Will it affect the current state of the project ? Other features prop up.
- 8. 8
- 9. 9 Delimiter – Cross Project Quota Library • Delimiter – Library not a Service • Delimiter’s role is to impose restriction on resource consumption. • Delimiter will not be responsible for rate limiting. • Delimiter will not maintain data for the resources. • Respective projects will take care of keeping, maintaining data for resources. • Delimiter won’t have the concept of reservation. • Delimiter may fetch information for project quota from Keystone or respective projects. • Delimiter will understand both Flat and Nested models. • Consolidate utility code for quota issues at common place.