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Even Pods Spread - 4. Preemption Support #79062

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merged 5 commits into from
Jul 25, 2019
Merged

Even Pods Spread - 4. Preemption Support #79062

merged 5 commits into from
Jul 25, 2019

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Huang-Wei
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@Huang-Wei Huang-Wei commented Jun 15, 2019 •
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What type of PR is this?

/sig scheduling
/hold

/assign @bsalamat
/cc @krmayankk

What this PR does / why we need it:

This is the 4th PR of the "Even Pods Spread" KEP implementation. After this PR, users can run workloads using "hard topologySpreadConstraints", and high priority Pod can preempt low priority one. (PR to support Priority will be sent out later)

  • Supports preemption for EvenPodsSpread
  • Unit tests on PredicateMetadata
  • Unit tests on genericScheduler.Schedule()

Which issue(s) this PR fixes:

Part of #77284.

Special notes for your reviewer:

Does this PR introduce a user-facing change?:

(will document all the changes in one place)

NONE

@k8s-ci-robot k8s-ci-robot added do-not-merge/hold Indicates that a PR should not merge because someone has issued a /hold command. release-note-none Denotes a PR that doesn't merit a release note. sig/scheduling Categorizes an issue or PR as relevant to SIG Scheduling. size/XXL Denotes a PR that changes 1000+ lines, ignoring generated files. labels Jun 15, 2019
@k8s-ci-robot k8s-ci-robot added needs-kind Indicates a PR lacks a `kind/foo` label and requires one. needs-priority Indicates a PR lacks a `priority/foo` label and requires one. cncf-cla: yes Indicates the PR's author has signed the CNCF CLA. labels Jun 15, 2019
@Huang-Wei Huang-Wei mentioned this pull request Jun 15, 2019
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/kind feature
/priority important-soon

@k8s-ci-robot k8s-ci-robot added kind/feature Categorizes issue or PR as related to a new feature. kind/api-change Categorizes issue or PR as related to adding, removing, or otherwise changing an API priority/important-soon Must be staffed and worked on either currently, or very soon, ideally in time for the next release. sig/apps Categorizes an issue or PR as relevant to SIG Apps. and removed needs-kind Indicates a PR lacks a `kind/foo` label and requires one. needs-priority Indicates a PR lacks a `priority/foo` label and requires one. labels Jun 15, 2019
@Huang-Wei Huang-Wei mentioned this pull request Jun 15, 2019
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/retest

tedyu
tedyu reviewed Jun 16, 2019
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pkg/apis/core/validation/validation.go Outdated Show resolved Hide resolved
pkg/apis/core/validation/validation.go Outdated Show resolved Hide resolved
pkg/scheduler/algorithm/predicates/metadata.go Outdated Show resolved Hide resolved
pkg/scheduler/algorithm/predicates/metadata.go Outdated Show resolved Hide resolved
pkg/scheduler/algorithm/predicates/metadata.go Outdated
for pair, podSet := range topologyPairsPodSpreadMap.topologyPairToPods {
// TODO(Huang-Wei): short circuit to skip non-visited <topologyKey: any value> pairs
// if we see 0 as min match of the topologyKey
if l := int32(len(podSet)); l < topologyPairsPodSpreadMap.minMatchMap[pair.key] {
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Should we check that len(podSet) > 0 ?

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Nope. If l == 0, it means there is a topology domain having 0 pod matching incoming pod's topologySpreadConstrains.

pkg/scheduler/algorithm/predicates/metadata.go Outdated Show resolved Hide resolved
pkg/scheduler/algorithm/predicates/metadata.go Outdated Show resolved Hide resolved
pkg/scheduler/algorithm/predicates/metadata.go Outdated Show resolved Hide resolved
pkg/scheduler/algorithm/predicates/predicates.go Outdated Show resolved Hide resolved
@k8s-ci-robot k8s-ci-robot added the needs-rebase Indicates a PR cannot be merged because it has merge conflicts with HEAD. label Jun 19, 2019
@k8s-ci-robot k8s-ci-robot removed the needs-rebase Indicates a PR cannot be merged because it has merge conflicts with HEAD. label Jul 3, 2019
@Huang-Wei Huang-Wei force-pushed the eps-preemption branch 2 times, most recently from 39de5fc to 926ca0f Compare July 3, 2019 21:06
@k8s-ci-robot k8s-ci-robot added the needs-rebase Indicates a PR cannot be merged because it has merge conflicts with HEAD. label Jul 3, 2019
@k8s-ci-robot k8s-ci-robot removed the needs-rebase Indicates a PR cannot be merged because it has merge conflicts with HEAD. label Jul 3, 2019
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/retest

@Huang-Wei Huang-Wei mentioned this pull request Jul 11, 2019
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@k8s-ci-robot k8s-ci-robot removed the needs-rebase Indicates a PR cannot be merged because it has merge conflicts with HEAD. label Jul 22, 2019
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[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: Huang-Wei

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@k8s-ci-robot k8s-ci-robot added the approved Indicates a PR has been approved by an approver from all required OWNERS files. label Jul 22, 2019
@Huang-Wei Huang-Wei mentioned this pull request Jul 23, 2019
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@Huang-Wei Huang-Wei force-pushed the eps-preemption branch 2 times, most recently from 6dd412e to 3a7b032 Compare July 24, 2019 06:37
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/retest

@alculquicondor alculquicondor mentioned this pull request Jul 24, 2019
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@k8s-ci-robot k8s-ci-robot added size/XL Denotes a PR that changes 500-999 lines, ignoring generated files. and removed size/XXL Denotes a PR that changes 1000+ lines, ignoring generated files. labels Jul 24, 2019
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/retest

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/retest

alculquicondor
alculquicondor approved these changes Jul 25, 2019
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LGTM

pkg/scheduler/algorithm/predicates/metadata_test.go
existingPods []*v1.Pod
nodeIdx int // denotes which node 'addedPod' belongs to
nodes []*v1.Node
injectPodPointers map[topologyPair][]int // non-negative index refers to existingPods[i], negative index refers to addedPod
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This is hard to understand. Maybe wantPodInTopology. Although, this might go away with the count based map, so we could leave it for now.

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ahg-g commented Jul 25, 2019

/lgtm

@k8s-ci-robot k8s-ci-robot added the lgtm "Looks good to me", indicates that a PR is ready to be merged. label Jul 25, 2019
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/hold cancel

@k8s-ci-robot k8s-ci-robot removed the do-not-merge/hold Indicates that a PR should not merge because someone has issued a /hold command. label Jul 25, 2019
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This PR may require API review.

If so, when the changes are ready, complete the pre-review checklist and request an API review.

Status of requested reviews is tracked in the API Review project.

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/retest

@k8s-ci-robot k8s-ci-robot merged commit 7fd8537 into kubernetes:master Jul 25, 2019
@Huang-Wei Huang-Wei deleted the eps-preemption branch July 25, 2019 21:46
@Huang-Wei Huang-Wei mentioned this pull request Aug 7, 2019
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@ahg-g ahg-g ahg-g left review comments

@draveness draveness draveness left review comments

@tedyu tedyu tedyu left review comments

@alculquicondor alculquicondor alculquicondor approved these changes

@krmayankk krmayankk Awaiting requested review from krmayankk

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@ahg-g ahg-g

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