Asynchronous preemption in the scheduler

[sanposhiho]

Enhancement Description

• One-line enhancement description (can be used as a release note): The scheduler runs the preemption (PostFilter) asynchronously to enhance the scheduling throughput on the failure scenarios.

• Kubernetes Enhancement Proposal: https://github.com/kubernetes/enhancements/blob/master/keps/sig-scheduling/4832-async-preemption/README.md

• Discussion Link: Run scheduler PostFilters asynchronously to improve throughput kubernetes#126858

• Primary contact (assignee): @sanposhiho

• Responsible SIGs: SIG-Scheduling

• Enhancement target (which target equals to which milestone):

  • Alpha release target (x.y): v1.32
  • Beta release target (x.y):
  • Stable release target (x.y):

• Alpha

  • KEP (k/enhancements) update PR(s): KEP-4832: Asynchronous preemption in the scheduler #4833
  • Code (k/k) update PR(s): feature(KEP-4832): asynchronous preemption kubernetes#128170
  • Docs (k/website) update PR(s): KEP-4832: add SchedulerAsyncPreemption to the doc website#48407

• Beta

  • KEP (k/enhancements) update PR(s): kep-4832: promote to beta #5127
  • Code (k/k) update PR(s): feat: graduate the async preemption feature to beta kubernetes#130550
  • Docs (k/website) update(s): KEP-4832: graduate the async preemption feature to beta website#49996

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

/sig scheduling
/assign

[alculquicondor]

/label lead-opted-in

[impact-maker]

Hello @sanposhiho @alculquicondor 👋, Enhancements team here.

Just checking in as we approach enhancements freeze on 02:00 UTC Friday 11th October 2024 / 19:00 PDT Thursday 10th October 2024.

This enhancement is targeting for stage alpha for v1.32 (correct me, if otherwise).

Here's where this enhancement currently stands:

• KEP readme using the latest template has been merged into the k/enhancements repo.
• KEP status is marked as implementable for latest-milestone: v1.32.
• KEP readme has up-to-date graduation criteria
• KEP has a production readiness review that has been completed and merged into k/enhancements. (For more information on the PRR process, check here). If your production readiness review is not completed yet, please make sure to fill the production readiness questionnaire in your KEP by the PRR Freeze deadline on Thursday, October 3rd, 2024 so that the PRR team has enough time to review your KEP.

For this KEP, we would just need to update the following:

• KEP has a production readiness review that has been completed and merged into k/enhancements.

The status of this enhancement is marked as at risk for enhancement freeze. Please keep the issue description up-to-date with appropriate stages as well.

If you anticipate missing enhancements freeze, you can file an exception request in advance. Thank you!

[tjons]

Hello 👋, v1.32 Enhancements team here.

Unfortunately, this enhancement did not meet requirements for enhancements freeze.

If you still wish to progress this enhancement in v1.32, please file an exception request as soon as possible, within three days. If you have any questions, you can reach out in the #release-enhancements channel on Slack and we'll be happy to help. Thanks!

[tjons]

/milestone clear

[sanposhiho]

@alculquicondor
Looks like we just missed the deadline.
I believe we can make an exception request because we only need an approval for PRR, and actually @/wojtek-t already mentioned it's generally OK for alpha. What do you think?

[sanposhiho]

I filed an exception request for it. cc @wojtek-t.