Understanding the design rationale behind Ozone Volumes

[silvanias]

Hi Ozone team,

Hope you're all doing well! My colleagues and I have been working with Ozone and we're trying to better understand the design decisions around volumes.

We've noticed that volumes seem to have similar quota and permission capabilities as buckets, and since S3 doesn't have this concept, we're curious about the specific benefits and use cases that drove this design choice.

A few questions we've been discussing:

• What are the key advantages of having volumes as a separate abstraction layer above buckets?
• Are there scalability or performance benefits to organizing buckets within volumes that we might be missing?
• What specific use cases or operational scenarios make volumes particularly valuable?

Are there any docs or design discussions we should check out, or could someone share some insights?

Thanks for all the great work on Ozone - we're really enjoying working with it!

[sumitagrawl]

Hi @silvanias

You are trying to compare volume concept with respect to S3, about its benefits.

One of benefit is "multi-tenancy feature" where a volume can be managed by respective tenant completely. Below are details about the feature:
https://ozone.apache.org/docs/2.0.0/feature/s3-multi-tenancy.html

Having volume a top entity designed to have better administrative control, some of description is given in below link,
https://ozone.apache.org/docs/edge/concept/volumesbucketskeys.html

Few of benefits as summary:

• multi-tenancy feature support
• Better administrative control over quota allocation (provide high level of grouping for overall allocation to a business unit)
  • Quota is constrained to volume and bucket for performance
• Improve concurrency with segregation of control within a group, ie volume, and further bucket.
• monitoring,...

[kerneltime]

We are working on a new documentation website which is for now hosted here: https://kerneltime.github.io/ozone-site/docs/core-concepts/namespace/volumes/overview/
Please take a look at the explanation for volumes.