KEP-902keps/sig-scheduling/902-non-preempting-priorityclass

Add NonPreempting Option For PriorityClasses

implementedstablesig-schedulinglatest v1.24

KEP on GitHub kep.yaml Ask about this KEP

PriorityClasses are a GA feature as on 1.14, which impact the scheduling and eviction of pods. Pods are be scheduled according to descending priority. If a pod cannot be scheduled due to insufficient resources, lower-priority pods will be preempted to make room. This proposal makes the preempting behavior optional for a PriorityClass, by adding a new field to PriorityClasses, which in turn populates PodSpec. If a pod is waiting to be scheduled, and it does not have preemption enabled, it will not trigger preemption of other pods.

Facts

Authors: @vllry @denkensk
Approvers: @bsalamat @huang-wei
Reviewers: @k82cn @huang-wei @wgliang
PRR approvers: @wojtek-tstable
Tracking issue: #902(opens GitHub in a new tab) closedcompletedclosed 2022-08-07 14:40 UTCmilestone v1.24sig/schedulingstage/stablelifecycle/stalekind/api-change
Milestones: alpha v1.15beta v1.19stable v1.24
Participating SIGs: none
Feature gates: NonPreemptingPriority
Created / last updated: 2019-03-17 / none

Who decided each state, with the evidence.
Decided	Decision	Deciders	Evidence
2020-05-19 05:41 UTC	stage_graduation KEP-902 set milestone.alpha to v1.15 in PR #1781, approved by huang-wei; merged by automation (k8s-ci-robot) on 2020-05-19.	@huang-wei approve_command @huang-wei lgtm @denkensk author @k8s-ci-robot merger	Commit kubernetes/enhancements@654e44589efa6303e7566be6b42dabb09a6741f0(opens GitHub in a new tab) StatusChange milestone.alpha ∅ → v1.15 (2020-05-19)(opens GitHub in a new tab) PullRequest kubernetes/enhancements#1781 Promote non-preempting option of PriorityClasses to beta in 1.19(opens GitHub in a new tab) Comment kubernetes/enhancements/issues/comments/630592569(opens GitHub in a new tab) Comment kubernetes/enhancements/issues/comments/630592395(opens GitHub in a new tab)
2020-05-19 05:41 UTC	stage_graduation KEP-902 set milestone.beta to v1.19 in PR #1781, approved by huang-wei; merged by automation (k8s-ci-robot) on 2020-05-19.	@huang-wei approve_command @huang-wei lgtm @denkensk author @k8s-ci-robot merger	Commit kubernetes/enhancements@654e44589efa6303e7566be6b42dabb09a6741f0(opens GitHub in a new tab) StatusChange milestone.beta ∅ → v1.19 (2020-05-19)(opens GitHub in a new tab) PullRequest kubernetes/enhancements#1781 Promote non-preempting option of PriorityClasses to beta in 1.19(opens GitHub in a new tab) Comment kubernetes/enhancements/issues/comments/630592569
2020-05-19 05:41 UTC	stage_graduation KEP-902 graduated to beta in PR #1781, approved by huang-wei; merged by automation (k8s-ci-robot) on 2020-05-19.	@huang-wei approve_command @huang-wei lgtm @denkensk author @k8s-ci-robot merger	Commit kubernetes/enhancements@654e44589efa6303e7566be6b42dabb09a6741f0(opens GitHub in a new tab) StatusChange stage ∅ → beta (2020-05-19)(opens GitHub in a new tab) PullRequest kubernetes/enhancements#1781 Promote non-preempting option of PriorityClasses to beta in 1.19(opens GitHub in a new tab) Comment kubernetes/enhancements/issues/comments/630592569
2020-05-19 05:41 UTC	status_transition KEP-902 status set to implemented in PR #1781, approved by huang-wei; merged by automation (k8s-ci-robot) on 2020-05-19.	@huang-wei approve_command @huang-wei lgtm @denkensk author @k8s-ci-robot merger	Commit kubernetes/enhancements@654e44589efa6303e7566be6b42dabb09a6741f0(opens GitHub in a new tab) StatusChange status ∅ → implemented (2020-05-19)(opens GitHub in a new tab) PullRequest kubernetes/enhancements#1781 Promote non-preempting option of PriorityClasses to beta in 1.19(opens GitHub in a new tab) Comment kubernetes/enhancements/issues/comments/630592569
2020-05-20 02:50 UTC	status_transition KEP-902 status changed from implemented to implementable in PR #1800, approved by huang-wei; merged by automation (k8s-ci-robot) on 2020-05-20.	@huang-wei approve_command @huang-wei lgtm @denkensk author @k8s-ci-robot merger	Commit kubernetes/enhancements@518b250cad0a5f11685b7953757cff6dbbb43972(opens GitHub in a new tab) StatusChange status implemented → implementable (2020-05-20)(opens GitHub in a new tab) PullRequest kubernetes/enhancements#1800 Fix status of NonPreempt Kep(opens GitHub in a new tab) Comment kubernetes/enhancements/issues/comments/631202792
2022-01-13 18:42 UTC	prr_approval wojtek-t gave the production readiness approval for KEP-902 at stable on 2022-01-13.	@wojtek-t prr_approver	Document 902.yaml(opens GitHub in a new tab)
2022-01-14 09:50 UTC	milestone_retarget KEP-902 latest-milestone moved from v1.19 to v1.24 in PR #3110, approved by alculquicondor, huang-wei; merged by automation (k8s-ci-robot) on 2022-01-14.	@alculquicondor approve_command @huang-wei approve_command @huang-wei lgtm @wojtek-t lgtm @denkensk author @k8s-ci-robot merger	Commit kubernetes/enhancements@e974b5a2cc9c1f897c1206694347fc37dc710e8d(opens GitHub in a new tab) StatusChange latest_milestone v1.19 → v1.24 (2022-01-13)(opens GitHub in a new tab) PullRequest kubernetes/enhancements#3110 Graduate NonPreemptingPriority to GA
2022-01-14 09:50 UTC	stage_graduation KEP-902 set milestone.stable to v1.24 in PR #3110, approved by alculquicondor, huang-wei; merged by automation (k8s-ci-robot) on 2022-01-14.	@alculquicondor approve_command @huang-wei approve_command @huang-wei lgtm @wojtek-t lgtm @denkensk author @k8s-ci-robot merger	Commit kubernetes/enhancements@e974b5a2cc9c1f897c1206694347fc37dc710e8d(opens GitHub in a new tab) StatusChange milestone.stable ∅ → v1.24 (2022-01-13)(opens GitHub in a new tab) PullRequest kubernetes/enhancements#3110 Graduate NonPreemptingPriority to GA
2022-01-14 09:50 UTC	stage_graduation KEP-902 graduated to stable from beta in PR #3110, approved by alculquicondor, huang-wei; merged by automation (k8s-ci-robot) on 2022-01-14.	@alculquicondor approve_command @huang-wei approve_command @huang-wei lgtm @wojtek-t lgtm @denkensk author @k8s-ci-robot merger	Commit kubernetes/enhancements@e974b5a2cc9c1f897c1206694347fc37dc710e8d(opens GitHub in a new tab) StatusChange stage beta → stable (2022-01-13)(opens GitHub in a new tab) PullRequest kubernetes/enhancements#3110 Graduate NonPreemptingPriority to GA
2022-06-20 13:30 UTC	status_transition KEP-902 status changed from implementable to implemented in PR #3414, approved by ahg-g; merged by automation (k8s-ci-robot) on 2022-06-20.	@ahg-g approve_command @ahg-g lgtm @denkensk author @k8s-ci-robot merger	Commit kubernetes/enhancements@db22677d2ad8d179638dd00299e1290a628158ac(opens GitHub in a new tab) StatusChange status implementable → implemented (2022-06-20)(opens GitHub in a new tab) PullRequest kubernetes/enhancements#3414 mark non-preempting policy as implemented(opens GitHub in a new tab) Comment kubernetes/enhancements/issues/comments/1160449743

Metadata, label and milestone changes, oldest first.Showing 1–10 of 63Rows

Status history
At	Kind	Field	Change	Actor	Evidence
2019-03-18 04:39 UTC	label	needs-sig added	none → needs-sig	@k8s-ci-robot	source(opens GitHub in a new tab)
2019-03-18 04:39 UTC	label	sig/scheduling added	none → sig/scheduling	@k8s-ci-robot	source

Relationships as stored, Person → KEP, from kep.yaml(opens GitHub in a new tab)
Person	Relationship
@vllry GitHub(opens GitHub in a new tab)	—AUTHORED→
@denkensk GitHub(opens GitHub in a new tab)	—AUTHORED→
@k82cn GitHub(opens GitHub in a new tab)	—REVIEWS→
@huang-wei GitHub

How they connect

Shortest paths in the graph between this KEP and its SIG or one of its people, up to four hops.

Impact of change

Rows returned by the tool
Kep	Depth	Reached	By hop	Open pull requests	Hop	Feature gates	Sigs	People
{ "label": "KEP", "key": "keps/sig-scheduling/902-non-preempting-priorityclass", "title": "Add NonPreempting Option For PriorityClasses", "url": "https://github.com/kubernetes/enhancements/tree/5b503a75369bdfdd494a2c2c72107a41bf6dd1a8/keps/sig-scheduling/902-non-preempting-priorityclass", "evidence_id": "2wtf3mzjnqy2", "number": 902, "owning_sig": "sig-scheduling", "status": "implemented", "stage": "stable", "latest_milestone": "v1.24", "milestone_alpha": "v1.15", "milestone_beta": "v1.19", "milestone_stable": "v1.24", "creation_date": "2019-03-17", "metadata_invalid": false }	2	6	{ "1": { "feature_gates": 1, "sigs": 1, "people": 4 } }	not in graph (merged pull requests only)	none	none	none	none
none	none	none	none	none	1	[ { "label": "FeatureGate", "key": "NonPreemptingPriority", "title": "NonPreemptingPriority", "url": "https://github.com/kubernetes/enhancements/blob/5b503a75369bdfdd494a2c2c72107a41bf6dd1a8/keps/sig-scheduling/902-non-preempting-priorityclass/kep.yaml", "evidence_id": "dkias6zgkvj3", "name": "NonPreemptingPriority" } ]	[ { "label": "SIG", "key": "sig-scheduling", "title": "Scheduling", "url": "https://github.com/kubernetes/community/tree/440e496d3a172234d81728df1bfe43849b589adf/sig-scheduling", "evidence_id": "maif65vfeb5k", "display_name": "Scheduling", "sig_label": "scheduling", "in_scope": true } ]	[ { "label": "Person", "key": "vllry", "title": "vllry", "url": "https://github.com/vllry", "evidence_id": "czbude742gbw", "login": "vllry", "is_bot": false }, { "label": "Person", "key": "denkensk", "title": "denkensk", "url": "https://github.com/denkensk", "evidence_id": "jpxluevgoy55", "login": "denkensk", "is_bot": false }, { "label": "Person", "key": "bsalamat", "title": "bsalamat", "url": "https://github.com/bsalamat", "evidence_id": "l2izawf3czvd", "login": "bsalamat", "is_bot": false }, { "label": "Person", "key": "huang-wei", "title": "huang-wei", "url": "https://github.com/huang-wei", "evidence_id": "nbxynfywytvd", "login": "huang-wei", "is_bot": false } ]

Rows returned by the tool
Kep	Depth	Reached	By hop	Open pull requests	Hop	Feature gates	Sigs	People
{ "label": "KEP", "key": "keps/sig-scheduling/902-non-preempting-priorityclass", "title": "Add NonPreempting Option For PriorityClasses", "url": "https://github.com/kubernetes/enhancements/tree/5b503a75369bdfdd494a2c2c72107a41bf6dd1a8/keps/sig-scheduling/902-non-preempting-priorityclass", "evidence_id": "2wtf3mzjnqy2", "number": 902, "owning_sig": "sig-scheduling", "status": "implemented", "stage": "stable", "latest_milestone": "v1.24", "milestone_alpha": "v1.15", "milestone_beta": "v1.19", "milestone_stable": "v1.24", "creation_date": "2019-03-17", "metadata_invalid": false }	2	6	{ "1": { "feature_gates": 1, "sigs": 1, "people": 4 } }	not in graph (merged pull requests only)	none	none	none	none
none	none	none	none	none	1	[ { "label": "FeatureGate", "key": "NonPreemptingPriority", "title": "NonPreemptingPriority", "url": "https://github.com/kubernetes/enhancements/blob/5b503a75369bdfdd494a2c2c72107a41bf6dd1a8/keps/sig-scheduling/902-non-preempting-priorityclass/kep.yaml", "evidence_id": "dkias6zgkvj3", "name": "NonPreemptingPriority" } ]	[ { "label": "SIG", "key": "sig-scheduling", "title": "Scheduling", "url": "https://github.com/kubernetes/community/tree/440e496d3a172234d81728df1bfe43849b589adf/sig-scheduling", "evidence_id": "maif65vfeb5k", "display_name": "Scheduling", "sig_label": "scheduling", "in_scope": true } ]	[ { "label": "Person", "key": "vllry", "title": "vllry", "url": "https://github.com/vllry", "evidence_id": "czbude742gbw", "login": "vllry", "is_bot": false }, { "label": "Person", "key": "denkensk", "title": "denkensk", "url": "https://github.com/denkensk", "evidence_id": "jpxluevgoy55", "login": "denkensk", "is_bot": false }, { "label": "Person", "key": "bsalamat", "title": "bsalamat", "url": "https://github.com/bsalamat", "evidence_id": "l2izawf3czvd", "login": "bsalamat", "is_bot": false }, { "label": "Person", "key": "huang-wei", "title": "huang-wei", "url": "https://github.com/huang-wei", "evidence_id": "nbxynfywytvd", "login": "huang-wei", "is_bot": false } ]

Kep

Depth

Reached

By hop

Open pull requests

Hop

Feature gates

Sigs

People

{
  "label": "KEP",
  "key": "keps/sig-scheduling/902-non-preempting-priorityclass",
  "title": "Add NonPreempting Option For PriorityClasses",
  "url": "https://github.com/kubernetes/enhancements/tree/5b503a75369bdfdd494a2c2c72107a41bf6dd1a8/keps/sig-scheduling/902-non-preempting-priorityclass",
  "evidence_id": "2wtf3mzjnqy2",
  "number": 902,
  "owning_sig": "sig-scheduling",
  "status": "implemented",
  "stage": "stable",
  "latest_milestone": "v1.24",
  "milestone_alpha": "v1.15",
  "milestone_beta": "v1.19",
  "milestone_stable": "v1.24",
  "creation_date": "2019-03-17",
  "metadata_invalid": false
}

{
  "1": {
    "feature_gates": 1,
    "sigs": 1,
    "people": 4
  }
}

not in graph (merged pull requests only)

[
  {
    "label": "FeatureGate",
    "key": "NonPreemptingPriority",
    "title": "NonPreemptingPriority",
    "url": "https://github.com/kubernetes/enhancements/blob/5b503a75369bdfdd494a2c2c72107a41bf6dd1a8/keps/sig-scheduling/902-non-preempting-priorityclass/kep.yaml",
    "evidence_id": "dkias6zgkvj3",
    "name": "NonPreemptingPriority"
  }
]

[
  {
    "label": "SIG",
    "key": "sig-scheduling",
    "title": "Scheduling",
    "url": "https://github.com/kubernetes/community/tree/440e496d3a172234d81728df1bfe43849b589adf/sig-scheduling",
    "evidence_id": "maif65vfeb5k",
    "display_name": "Scheduling",
    "sig_label": "scheduling",
    "in_scope": true
  }
]

[
  {
    "label": "Person",
    "key": "vllry",
    "title": "vllry",
    "url": "https://github.com/vllry",
    "evidence_id": "czbude742gbw",
    "login": "vllry",
    "is_bot": false
  },
  {
    "label": "Person",
    "key": "denkensk",
    "title": "denkensk",
    "url": "https://github.com/denkensk",
    "evidence_id": "jpxluevgoy55",
    "login": "denkensk",
    "is_bot": false
  },
  {
    "label": "Person",
    "key": "bsalamat",
    "title": "bsalamat",
    "url": "https://github.com/bsalamat",
    "evidence_id": "l2izawf3czvd",
    "login": "bsalamat",
    "is_bot": false
  },
  {
    "label": "Person",
    "key": "huang-wei",
    "title": "huang-wei",
    "url": "https://github.com/huang-wei",
    "evidence_id": "nbxynfywytvd",
    "login": "huang-wei",
    "is_bot": false
  }
]

MATCH (k:KEP {key: $key}) RETURN k LIMIT 1 ; MATCH (k:KEP {key: $key}) MATCH path = (k)-[:REPLACES|SUPERSEDED_BY|SEE_ALSO|GATED_BY*1..2]-(n) WHERE n <> k AND (n:KEP OR n:FeatureGate) AND all(x IN nodes(path)[1..-1] WHERE x <> k AND (x:KEP OR (x:FeatureGate AND NOT x.key IN $placeholders))) WITH n, path ORDER BY length(path), [x IN nodes(path) | x.key] WITH n, collect(path)[0] AS path RETURN n AS node, length(path) AS hop, path ORDER BY hop, n.key LIMIT 150 ; UNWIND $keys AS kk MATCH (k:KEP {key: kk}) RETURN k.key AS kep, [(k)-[r_0:OWNED_BY]->(s_0:SIG) WHERE coalesce(r_0.valid_to, $open) = $open | s_0] AS sigs, [(p_1:Person)-[r_1:AUTHORED]->(k) WHERE coalesce(r_1.valid_to, $open) = $open AND coalesce(p_1.is_bot, false) = false | p_1] AS authors, [(p_2:Person)-[r_2:APPROVES]->(k) WHERE coalesce(r_2.valid_to, $open) = $open AND coalesce(p_2.is_bot, false) = false | p_2] AS approvers, [(k)-[r_3:TRACKED_BY]->(i_3:Issue) WHERE coalesce(r_3.valid_to, $open) = $open AND i_3.state = 'open' | i_3] AS open_issues LIMIT 200

Add NonPreempting Option For PriorityClasses

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