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HPA scale-in: is pod resource usage taken into account to prioritize pods to be deleted ? #124821

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remiville opened this issue May 11, 2024 · 8 comments
Open

HPA scale-in: is pod resource usage taken into account to prioritize pods to be deleted ? #124821

remiville opened this issue May 11, 2024 · 8 comments
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lifecycle/rotten Denotes an issue or PR that has aged beyond stale and will be auto-closed. needs-triage Indicates an issue or PR lacks a `triage/foo` label and requires one. sig/autoscaling Categorizes an issue or PR as relevant to SIG Autoscaling.

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@remiville
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Hello,

I know that in case of node resource pressure, the controller prioritizes pods to be evicted, for example in case of node memory pressure, pods using more memory than requested are prioritised for deletion.

But for HPA scale-in I struggle to find if and how pods are sorted to prioritize them for deletion.

While looking at the PodDeletionCost feature PR I found this priorization comment in the code https://github.com/ahg-g/kubernetes/blob/2d88d2d993b36c231fdc7537212685544469c517/pkg/controller/controller_utils.go#L785

Does it mean that no resource usage is taken into account when the controller has to select pods to be deleted during a scale in event ?

For example, if a scale-in occurs because the CPU usage is lower than the threshold set in the HPA, the controller will select pods to be deleted without prioritizing them by their current CPU usage, right ?
@k8s-ci-robot k8s-ci-robot added needs-sig Indicates an issue or PR lacks a `sig/foo` label and requires one. needs-triage Indicates an issue or PR lacks a `triage/foo` label and requires one. labels May 11, 2024
@k8s-ci-robot
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This issue is currently awaiting triage.

If a SIG or subproject determines this is a relevant issue, they will accept it by applying the triage/accepted label and provide further guidance.

The triage/accepted label can be added by org members by writing /triage accepted in a comment.

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@HirazawaUi
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/sig autoscaling

@k8s-ci-robot k8s-ci-robot added sig/autoscaling Categorizes an issue or PR as relevant to SIG Autoscaling. and removed needs-sig Indicates an issue or PR lacks a `sig/foo` label and requires one. labels May 12, 2024
@ishaankalra
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Can I give it a try?

@HirazawaUi
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Can I give it a try?

Need to wait for confirmation and triage from the sig autoscaling team.

@k8s-triage-robot
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The Kubernetes project currently lacks enough contributors to adequately respond to all issues.

This bot triages un-triaged issues according to the following rules:

  • After 90d of inactivity, lifecycle/stale is applied
  • After 30d of inactivity since lifecycle/stale was applied, lifecycle/rotten is applied
  • After 30d of inactivity since lifecycle/rotten was applied, the issue is closed

You can:

  • Mark this issue as fresh with /remove-lifecycle stale
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Please send feedback to sig-contributor-experience at kubernetes/community.

/lifecycle stale

@k8s-ci-robot k8s-ci-robot added the lifecycle/stale Denotes an issue or PR has remained open with no activity and has become stale. label Aug 12, 2024
@HirazawaUi
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/remove-lifecycle stale

@k8s-ci-robot k8s-ci-robot removed the lifecycle/stale Denotes an issue or PR has remained open with no activity and has become stale. label Aug 12, 2024
@k8s-triage-robot
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The Kubernetes project currently lacks enough contributors to adequately respond to all issues.

This bot triages un-triaged issues according to the following rules:

  • After 90d of inactivity, lifecycle/stale is applied
  • After 30d of inactivity since lifecycle/stale was applied, lifecycle/rotten is applied
  • After 30d of inactivity since lifecycle/rotten was applied, the issue is closed

You can:

  • Mark this issue as fresh with /remove-lifecycle stale
  • Close this issue with /close
  • Offer to help out with Issue Triage

Please send feedback to sig-contributor-experience at kubernetes/community.

/lifecycle stale

@k8s-ci-robot k8s-ci-robot added the lifecycle/stale Denotes an issue or PR has remained open with no activity and has become stale. label Nov 10, 2024
@k8s-triage-robot
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The Kubernetes project currently lacks enough active contributors to adequately respond to all issues.

This bot triages un-triaged issues according to the following rules:

  • After 90d of inactivity, lifecycle/stale is applied
  • After 30d of inactivity since lifecycle/stale was applied, lifecycle/rotten is applied
  • After 30d of inactivity since lifecycle/rotten was applied, the issue is closed

You can:

  • Mark this issue as fresh with /remove-lifecycle rotten
  • Close this issue with /close
  • Offer to help out with Issue Triage

Please send feedback to sig-contributor-experience at kubernetes/community.

/lifecycle rotten

@k8s-ci-robot k8s-ci-robot added lifecycle/rotten Denotes an issue or PR that has aged beyond stale and will be auto-closed. and removed lifecycle/stale Denotes an issue or PR has remained open with no activity and has become stale. labels Dec 10, 2024
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@k8s-ci-robot @remiville @k8s-triage-robot @HirazawaUi @ishaankalra