Document the new NodeInclusionPolicyInPodTopologySpread feature gate #35044

kerthcet · 2022-07-15T06:09:01Z

Signed-off-by: kerthcet [email protected]

Ref: kubernetes/enhancements#3094
/sig scheduling

netlify · 2022-07-15T06:09:07Z

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chrisnegus

/lgtm

sftim · 2022-07-18T19:45:35Z

This doesn't seem to be ready for review.
/lgtm cancel

kerthcet · 2022-07-28T08:55:41Z

Document is ready to review now. cc @alculquicondor

cathchu · 2022-07-29T19:39:19Z

Hey there 👋 @kerthcet, 1.25 Release Docs Shadow here!

Thanks for filing this placeholder. As a reminder, final docs PRs are due August 9th. Take a look at Documenting a release for additional information for the docs requirement for the release.

Thanks again!

reylejano · 2022-08-04T05:15:20Z

/milestone 1.25
/assign @cathchu
/cc @kcmartin

content/en/docs/concepts/scheduling-eviction/topology-spread-constraints.md

alculquicondor · 2022-08-04T19:21:04Z

content/en/docs/concepts/scheduling-eviction/topology-spread-constraints.md

  that match this label selector are counted to determine the
  number of Pods in their corresponding topology domain.
  See [Label Selectors](/docs/concepts/overview/working-with-objects/labels/#label-selectors)
  for more details.


We have improved our API docs a lot to include definitions of "topology domain", "eligible domain", and others. For example: https://github.com/kubernetes/api/blob/c8f06018bfc8e3c8213c53ec87b7fa4e2b9121ab/core/v1/types.go#L3396

Could you add those in this doc?

Maybe we could add the definitions before talking about the field themselves.

It's also OK to link to https://kubernetes.io/docs/reference/kubernetes-api/workload-resources/pod-v1/#scheduling (ie, in Markdown it'd be [anchor text](/docs/reference/kubernetes-api/workload-resources/pod-v1/#scheduling)) if that's useful. No need to repeat the API reference word-for-word.

Thanks, updated

content/en/docs/reference/command-line-tools-reference/feature-gates.md

sftim · 2022-08-06T16:43:59Z

content/en/docs/concepts/scheduling-eviction/topology-spread-constraints.md

  cluster. This could lead to a problem in autoscaled clusters, when a node pool (or
  node group) is scaled to zero nodes, and you're expecting the cluster to scale up,
  because, in this case, those topology domains won't be considered until there is
-  at least one node in them.  


Please retain the line break here (triggered by two spaces at the end of the line).

Should we? I found other paragraphs don't have this. It was auto formatted.

Maybe use an actual empty line?

If you'd like to insist this change, at least make it a separate commit (or even separate PR). It's not part of documenting NodeInclusionPolicyInPodTopologySpread.

hold for #35966
/hold

content/en/docs/reference/command-line-tools-reference/feature-gates.md

sftim · 2022-08-09T10:33:25Z

content/en/docs/reference/command-line-tools-reference/feature-gates.md

 - `NetworkPolicyStatus`: Enable the `status` subresource for NetworkPolicy objects.
 - `NodeInclusionPolicyInPodTopologySpread`: Enable using `nodeAffinityPolicy` and `nodeTaintsPolicy`
-  in Pod [topology spread constraints](/docs/concepts/workloads/pods/pod-topology-spread-constraints/)
+  in Pod [topology spread constraints](/docs/concepts/scheduling-eviction/topology-spread-constraints/)


Suggested change

in Pod [topology spread constraints](/docs/concepts/scheduling-eviction/topology-spread-constraints/)

in [Pod topology spread constraints](/docs/concepts/scheduling-eviction/topology-spread-constraints/)

alculquicondor

:( I forgot to send my review last week

content/en/docs/concepts/scheduling-eviction/topology-spread-constraints.md

alculquicondor · 2022-08-09T17:11:49Z

content/en/docs/concepts/scheduling-eviction/topology-spread-constraints.md

+	We consider each <key, value> as a "bucket", and try to put balanced number
+	of pods into each bucket.
+	We define a domain as a particular instance of a topology.


I just realized we were saying the same thing twice.

Suggested change

We consider each <key, value> as a "bucket", and try to put balanced number

of pods into each bucket.

We define a domain as a particular instance of a topology.

We call each instance of a topology (in other words, a <key, value> pair) a domain. The scheduler will try to put a balanced number of pods into each domain.

You can fix the API too, but we can leave that for 1.26.

Updated as advised in another PR #35966, this one only focus on the new feature introduced.

alculquicondor · 2022-08-09T17:15:00Z

content/en/docs/concepts/scheduling-eviction/topology-spread-constraints.md

  cluster. This could lead to a problem in autoscaled clusters, when a node pool (or
  node group) is scaled to zero nodes, and you're expecting the cluster to scale up,
  because, in this case, those topology domains won't be considered until there is
-  at least one node in them.  


Maybe use an actual empty line?

alculquicondor · 2022-08-16T13:25:40Z

I can lgtm after rebase

Signed-off-by: kerthcet <[email protected]>

kerthcet · 2022-08-17T02:32:33Z

Rebased.

kerthcet · 2022-08-17T02:32:58Z

/hold cancel

tengqm · 2022-08-17T09:08:00Z

/approve

k8s-ci-robot · 2022-08-17T09:08:21Z

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cathchu · 2022-08-17T13:46:12Z

/lgtm

k8s-ci-robot · 2022-08-17T13:46:31Z

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This was referenced Jul 23, 2022

remove SelectorSpread plugin kubernetes/kubernetes#108444

Closed

Take taints/tolerations into consideration when calculating PodTopologySpread skew kubernetes/enhancements#3094

Closed

kerthcet force-pushed the feat/topology-policy branch from 89c8cd9 to c20b438 Compare July 28, 2022 08:46

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kerthcet changed the title ~~Add introductions to NodeInclusionPolicy~~ Document the new NodeInclusionPolicyInPodTopologySpread feature gate Jul 28, 2022

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Document the new NodeInclusionPolicyInPodTopologySpread feature gate

3b0b5b9

Signed-off-by: kerthcet <[email protected]>

kerthcet force-pushed the feat/topology-policy branch from 4a66046 to 3b0b5b9 Compare August 17, 2022 02:32

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	in Pod [topology spread constraints](/docs/concepts/scheduling-eviction/topology-spread-constraints/)
	in [Pod topology spread constraints](/docs/concepts/scheduling-eviction/topology-spread-constraints/)

Document the new NodeInclusionPolicyInPodTopologySpread feature gate #35044

Document the new NodeInclusionPolicyInPodTopologySpread feature gate #35044

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