Keep backward compatibility for 'node.Spec.Unschedulable'. #68984

k82cn · 2018-09-23T02:01:28Z

Signed-off-by: Da K. Ma klaus1982.cn@gmail.com

Which issue(s) this PR fixes (optional, in fixes #<issue number>(, fixes #<issue_number>, ...) format, will close the issue(s) when PR gets merged):
Fixes #68899

Release note:

Fixes issue [#68899](https://github.com/kubernetes/kubernetes/issues/68899) where pods might schedule on an unschedulable node.

k82cn · 2018-09-23T02:03:03Z

/kind bug
/priority critical-urgent
/sig scheduling
/milestone 1.12

k8s-ci-robot · 2018-09-23T02:03:04Z

@k82cn: The provided milestone is not valid for this repository. Milestones in this repository: [next-candidate, v1.10, v1.11, v1.12, v1.13, v1.4, v1.5, v1.6, v1.7, v1.8, v1.9]

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In response to this:

/kind bug
/priority critical-urgent
/sig scheduling
/milestone 1.12

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k82cn · 2018-09-23T02:04:55Z

/milestone v1.12

liggitt · 2018-09-23T02:10:11Z

pkg/scheduler/algorithm/predicates/predicates.go

@@ -1470,7 +1470,15 @@ func CheckNodeUnschedulablePredicate(pod *v1.Pod, meta algorithm.PredicateMetada
 		return false, []algorithm.PredicateFailureReason{ErrNodeUnknownCondition}, nil
 	}

-	if nodeInfo.Node().Spec.Unschedulable {
+	// If pod tolerate unschedulable taint, it's also tolerate node.Spec.Unschedulable.
+	unschedulable := !v1helper.TolerationsTolerateTaint(pod.Spec.Tolerations, &v1.Taint{


the var name makes this hard to follow, as does combining info about the node and info about the pod into a single variable below. would something like this be clearer?

podToleratesUnschedulable := v1helper.TolerationsTolerateTaint(...)` if nodeInfo.Node().Spec.Unschedulable && !podToleratesUnschedulable { return false, []algorithm.PredicateFailureReason{ErrNodeUnschedulable}, nil }

liggitt · 2018-09-23T02:10:44Z

pkg/scheduler/algorithm/predicates/predicates.go

+		Key:    algorithm.TaintNodeUnschedulable,
+		Effect: v1.TaintEffectNoSchedule,
+	})
+	// TODO (k82cn): deprecates `node.Spec.Unschedulable` in 1.13.


it's unclear what is being deprecated here, or what action should be taken in 1.13

Update related doc to depreciate it.

Signed-off-by: Da K. Ma <klaus1982.cn@gmail.com>

tpepper

Given all of the conversation in #68899 and the nature of the problem here, I think this needs a better commit message still and might even deserve a release note under "Known Issues" or SIGs Scheduling/Node to at least remind operators what's changed here and the taints and tolerations they need to be considering across updates in this version range.

k82cn · 2018-09-23T03:29:47Z

I think this needs a better commit message still and might even deserve a release note

There's info in the description; no behaviour changed, so no release note here.

tpepper · 2018-09-23T04:23:09Z

So you're saying there's definitely absolutely no way this issue is user visible with respect to cluster operator's existing configs or in their cluster users' pod specs? If so, that feels like an argument this is not release blocking and is just an artifact of a stale test case. Yet you're only touching pkg/scheduler in this PR and not the test case. This doesn't match up.

Plus we do have a bunch of "fixes issue where..." type release notes. It seems to me this would be totally appropriate: "Fixes issue #68899 where pod might schedule on an incorrectly tainted node. Future note: node.Spec.Unschedulable will be deprecated in 1.13 as per issue #XXXXXX."

Ie: you should open an issue now for milestone 1.13 for this deprecation.

k82cn · 2018-09-23T04:51:38Z

Plus we do have a bunch of "fixes issue where..." type release notes.

Such kind of release node is ok to me.

krmayankk · 2018-09-24T07:10:49Z

will kubectl cordon be implemented using unschedulable taint instead of node.Spec.Unschedulable ?

tpepper · 2018-09-24T14:52:32Z

Plus we do have a bunch of "fixes issue where..." type release notes.

Such kind of release node is ok to me.

OK then we need confirmation this follows deprecation policy which I'm not sure is actually true, the relnote wording specified below, a decision on whether to put this is the Node or Scheduling notes section, and the deprecation issue opened against 1.13.

Possible relnote:

Fixes issue [#68899](https://github.com/kubernetes/kubernetes/issues/68899) where pods might schedule on an incorrectly tainted node. Deprecation notice: The alpha feature "Critical Pods" has been replaced and `node.Spec.Unschedulable` will be removed in 1.13 as per issue #XXXXXX.

liggitt · 2018-09-24T15:07:59Z

The api field will definitely not be removed from the v1 api. It's not entirely clear to me what behavior can be deprecated in v1. If a client stops setting it and just tries to set the taint, the controller will remove the taint automatically, right?

If kubectl wanted to begin simultaneously setting the unscheduleable field and taint in cordon (and removing them both in uncordon), that could maybe be ok, but would need to think about that a little more.

tpepper · 2018-09-24T16:19:53Z

I really want to see this PR finished off today so we get final confirmation on long running tests over the coming days head of 1.12. This is an important compatibility issue to resolve thoroughly.

tpepper · 2018-09-24T16:20:08Z

...and this is the only PR I'm holding the 1.12 release on at this point.

neolit123 · 2018-09-24T17:13:15Z

looks like anyone can LGTM this at this point.
(it is approved, has labels and milestone)

are further changes required here?

neolit123 · 2018-09-24T17:15:38Z

/hold
just in case.

tpepper · 2018-09-24T21:17:39Z

Chatting with @bsalamat it seems I've misread the intent here. Clarifying based on that:

release note suggestion: Fixes issue [#68899](https://github.com/kubernetes/kubernetes/issues/68899) where pods might schedule on an incorrectly tainted node.
Bobby will open an issue to track a future deprecation.
Deprecation announcement would be targeted for 1.13, with actual removal then being at least a year out given this is v1 stable content.

bsalamat · 2018-09-24T21:24:48Z

Thanks, @tpepper. Looks good to me, however, we can deprecate Node.Spec.Unschedulable only when our replacement (TaintNodeByCondition) is GA'ed. If that happens in 1.13 (which I doubt), we can deprecate Node.Spec.Unschedulable in 1.13. If not, we must wait for TaintNodeByCondition to be promoted to GA and then deprecate Node.Spec.Unschedulable.

bsalamat

/lgtm

k8s-ci-robot · 2018-09-24T21:28:47Z

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: bsalamat, k82cn

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neolit123 · 2018-09-24T21:35:51Z

/hold cancel

k82cn · 2018-09-25T05:57:06Z

will kubectl cordon be implemented using unschedulable taint instead of node.Spec.Unschedulable ?

Eventually, Yes; but we need to follow deprecation policy to do that.

If kubectl wanted to begin simultaneously setting the unscheduleable field and taint in cordon (and removing them both in uncordon),
that could maybe be ok, but would need to think about that a little more.

Agree, we need to think about it more; we can follow up this in #69010 .

tianshapjq · 2018-09-25T09:26:08Z

pkg/scheduler/algorithm/predicates/predicates_test.go

+	for _, test := range testCases {
+		nodeInfo := schedulercache.NewNodeInfo()
+		nodeInfo.SetNode(test.node)
+		fit, _, err := CheckNodeUnschedulablePredicate(test.pod, nil, nodeInfo)


seems like the CheckNodeUnschedulablePredicate() has no callers at all, can you confirm about that?
if so, do we still need to update this func?

Added it by RegisterMandatoryFitPredicate in this PR.

yujuhong · 2018-09-26T01:22:15Z

It's a bit unclear to me what "deprecation of the field" means here. We cannot remove the field from the api, so will it become a no-op a year from now? I don't think kubernete's deprecation policy explicitly states what to do in this case.

k82cn · 2018-09-26T02:24:33Z

so will it become a no-op a year from now? I don't think kubernete's deprecation policy explicitly states what to do in this case.

According to deprecation policy, "API elements may only be removed by incrementing the version of the API group.". For now, we only need to highlight spec.Unschedulable will be removed in future; but no behaviour changes right now, or someone has better idea for that :)

k8s-ci-robot requested review from davidopp and jayunit100 September 23, 2018 02:01

k8s-ci-robot added sig/scheduling Categorizes an issue or PR as relevant to SIG Scheduling. and removed needs-sig Indicates an issue or PR lacks a `sig/foo` label and requires one. labels Sep 23, 2018

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k82cn mentioned this pull request Sep 23, 2018

Keep backward compatibility for 'node.Spec.Unschedulable'. #68977

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k8s-ci-robot added this to the v1.12 milestone Sep 23, 2018

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Keep backward compatibility for 'node.Spec.Unschedulable'.

78f6484

Signed-off-by: Da K. Ma <klaus1982.cn@gmail.com>

k82cn force-pushed the k8s_68899_m branch from 7b6acfd to 78f6484 Compare September 23, 2018 02:34

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bsalamat mentioned this pull request Sep 24, 2018

Deprecate Node.Spec.Unschedulable when TaintNodeByCondition is GA'ed #69010

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dougm mentioned this pull request Sep 25, 2018

Keep backward compatibility for 'node.Spec.Unschedulable'. #69047

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k8s-ci-robot merged commit 762ddf7 into kubernetes:master Sep 27, 2018

BlaineEXE mentioned this pull request Apr 26, 2019

ceph-op: Remove taint check in "is node scheduable" func rook/rook#3063

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5 tasks

houminz mentioned this pull request Aug 10, 2020

Fix an error in NodeUnschedulable plugin comment #93706

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k82cn deleted the k8s_68899_m branch May 16, 2022 06:28

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Keep backward compatibility for 'node.Spec.Unschedulable'. #68984

Keep backward compatibility for 'node.Spec.Unschedulable'. #68984

k82cn commented Sep 23, 2018 •

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Keep backward compatibility for 'node.Spec.Unschedulable'. #68984

Keep backward compatibility for 'node.Spec.Unschedulable'. #68984

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