CSI Differential Snapshot for Block Volumes

[phuongatemc]

Enhancement Description

• One-line enhancement description (can be used as a release note): Add Differential Snapshot to CSI to provide a common method get differential snapshots of two arbitrary CSI VolumeSnapshots for PersistentVolumes that are backed by Block volumes in the backend storage.
• Kubernetes Enhancement Proposal: https://github.com/kubernetes/enhancements/blob/master/keps/sig-storage/3314-csi-changed-block-tracking/README.md
  CSI spec PR: Added the SnapshotMetadata service. container-storage-interface/spec#551
• Discussion Link: https://hackmd.io/VN_TBl3NSLaeiD8BLeeCfw?view
• Primary contact (assignee): @ihcsim @Braganza @PrasadG193
• Responsible SIGs: SIG-Storage
• Enhancement target (which target equals to which milestone):
  • Alpha release target (x.y): 1.33
  • Beta release target (x.y):
  • Stable release target (x.y):
• Alpha
  • KEP (k/enhancements) update PR(s): KEP-3314: CSI Changed Block Tracking #4082, KEP-3314: Update alpha target and latest-milestone for 1.32 #4909, KEP-3314: Update alpha target and latest-milestone for 1.33 #5133
  • Code (k/k) update PR(s):
  • CSI spec: Added the SnapshotMetadata service. container-storage-interface/spec#551
  • Request for new repository REQUEST: Create a new github repo for external-snapshot-metadata under kubernetes-csi org#4874
  • Entire External snapshot metadata repository https://github.com/kubernetes-csi/external-snapshot-metadata
  • csi-hostpath-driver repository:
    • Implement CSI SnapshotMetadata service kubernetes-csi/csi-driver-host-path#569
    • Add documentation to deploy and test SnapshotMetadata support kubernetes-csi/csi-driver-host-path#575
  • csi-test: Provide mocks for the SnapshotMetadata service kubernetes-csi/csi-test#544
  • test-infra:
    • Add external-snapshot-metadata repo to CSI jobs test-infra#33303
    • Use correct main branch in image publishing of external-snapshot-metadata test-infra#33700
  • csi-release-tools:
    • Treat main branch as equivalent to master branch kubernetes-csi/csi-release-tools#265
  • Docs (k/website) update PR(s): Blog: Blog post for changed block tracking feature website#48456

Please keep this description up to date. This will help the Enhancement Team to track the evolution of the enhancement efficiently.

[xing-yang]

/sig storage

[xing-yang]

/wg data-protection

[xing-yang]

/milestone v1.25

[jasonbraganza]

Hello @phuongatemc 👋, 1.25 Enhancements team here.

Just checking in as we approach enhancements freeze on 18:00 PST on Thursday June 16, 2022.

For note, This enhancement is targeting for stage alpha for 1.25 (correct me, if otherwise)

Here's where this enhancement currently stands:

• KEP file using the latest template has been merged into the k/enhancements repo.
• KEP status is marked as implementable
• KEP has a updated detailed test plan section filled out
• KEP has up to date graduation criteria
• KEP has a production readiness review that has been completed and merged into k/enhancements.

Looks like for this one, we would need to update the following:

• Have a KEP with all the above checkpoints included and a completed PRR, merged in kubernetes/enhancements repo

Open KEP PR #3367

For note, the status of this enhancement is marked as at risk. Please keep the issue description up-to-date with appropriate stages as well. Thank you!