support scheduler plugins #3612

KunWuLuan · 2025-05-16T08:08:58Z

Support users to set coscheduling of scheduler-plugins as kuberay's gang scheduler:
#3611

Follow the following introduction to install kube-scheduler and enable coscheduling plugin:
https://github.com/kubernetes-sigs/scheduler-plugins/blob/master/doc/install.md

After the installation of coscheduling plugin, users can use ray.io/gang-scheduling-enabled: "true" to
enable gang scheduling for raycluster.
Example:

apiVersion: ray.io/v1
kind: RayCluster
metadata:
  name: test-podgroup-0
  labels:
    ray.io/gang-scheduling-enabled: "true"
spec:
  rayVersion: "2.41.0"
  headGroupSpec:
    rayStartParams: {}
    template:
      spec:
        containers:
        - name: ray-head
          image: rayproject/ray:2.41.0
          resources:
            limits:
              cpu: "1"
              memory: "2Gi"
            requests:
              cpu: "1"
              memory: "2Gi"
  workerGroupSpecs:
  - groupName: worker
    rayStartParams: {}
    replicas: 2
    minReplicas: 2
    maxReplicas: 2
    template:
      spec:
        containers:
        - name: ray-head
          image: rayproject/ray:2.41.0
          resources:
            limits:
              cpu: "1"
              memory: "1Gi"
            requests:
              cpu: "1"
              memory: "1Gi"

You should see the following podgroup created by kuberay and labels added to the pods:

> k get podgroups.scheduling.x-k8s.io
NAME              PHASE        MINMEMBER   RUNNING   SUCCEEDED   FAILED   AGE
test-podgroup-0   Scheduling   3                                          28s
> k get po -L scheduling.x-k8s.io/pod-group
NAME                                  READY   STATUS    RESTARTS   AGE     POD-GROUP
test-podgroup-0-head                  1/1     Running   0          2m27s   test-podgroup-0
test-podgroup-0-worker-worker-dkwvl   1/1     Running   0          2m27s   test-podgroup-0
test-podgroup-0-worker-worker-znrbj   1/1     Running   0          2m27s   test-podgroup-0

Checks

I've made sure the tests are passing.
Testing Strategy
- Unit tests
- Manual tests
- This PR is not tested :(

KunWuLuan · 2025-05-27T01:38:24Z

@kevin85421 Hi, Please have a look when you have time. Thanks!

kevin85421 · 2025-05-27T21:54:48Z

@KunWuLuan can you resolve the conflict?

MortalHappiness

Please make sure your PR can run successfully. I tried to run your PR but it failed to create PodGroup.

You also need to update the following places

kuberay/helm-chart/kuberay-operator/values.yaml

Lines 49 to 76 in 75ea7ae

    
           # Enable customized Kubernetes scheduler integration. If enabled, Ray workloads will be scheduled 
        
           # by the customized scheduler. 
        
           #  * "enabled" is the legacy option and will be deprecated soon. 
        
           #  * "name" is the standard option, expecting a scheduler name, supported values are 
        
           #    "default", "volcano", and "yunikorn". 
        
           # 
        
           # Note: "enabled" and "name" should not be set at the same time. If both are set, an error will be thrown. 
        
           # 
        
           # Examples: 
        
           #  1. Use volcano (deprecated) 
        
           #       batchScheduler: 
        
           #         enabled: true 
        
           # 
        
           #  2. Use volcano 
        
           #       batchScheduler: 
        
           #         name: volcano 
        
           # 
        
           #  3. Use yunikorn 
        
           #       batchScheduler: 
        
           #         name: yunikorn 
        
           # 
        
           batchScheduler: 
        
             # Deprecated. This option will be removed in the future. 
        
             # Note, for backwards compatibility. When it sets to true, it enables volcano scheduler integration. 
        
             enabled: false 
        
             # Set the customized scheduler name, supported values are "volcano" or "yunikorn", do not set 
        
             # "batchScheduler.enabled=true" at the same time as it will override this option. 
        
             name: ""

kuberay/ray-operator/apis/config/v1alpha1/config_utils.go

Line 25 in 4a9e13e

if config.BatchScheduler == volcano.GetPluginName() || config.BatchScheduler == yunikorn.GetPluginName() {
Add a sample config named ray-cluster.kube-scheduler.yaml to ray-operator/config/samples/ folder

Follow-up:

Add a doc here https://github.com/ray-project/ray/tree/aec27916429e6d97564ec315f5f4b5654de12963/doc/source/cluster/kubernetes/k8s-ecosystem

ray-operator/controllers/ray/batchscheduler/scheduler-plugins/scheduler_plugins.go

KunWuLuan · 2025-05-29T14:52:04Z

Hi, I have update the helm chart and make sure it works in my local environment. Please have a look when you have time.Thanks
@MortalHappiness

andrewsykim · 2025-05-29T16:09:59Z

ray-operator/config/samples/ray-cluster.kube-scheduler.yaml

+metadata:
+  name: test-podgroup-0
+  labels:
+    ray.io/gang-scheduling-enabled: "true"


I don't think we should be using ray.io/* labels for any of the scheduler integrations. The label prefix should be specific to the integration (see other examples with Volcano, Yunikorn and Kueue)

Hi, ray.io/gang-scheduling-enabled is used in the sample of yunikorn, and ray.io/scheduler-name: volcano is used when we need to use volcano.
And these labels are defined here:

kuberay/ray-operator/controllers/ray/utils/constant.go

Lines 35 to 37 in 75a63a5

RaySchedulerName = "ray.io/scheduler-name"

RayPriorityClassName = "ray.io/priority-class-name"

RayClusterGangSchedulingEnabled = "ray.io/gang-scheduling-enabled"

We didn't create a new label for new scheduler.

ray-operator/controllers/ray/batchscheduler/scheduler-plugins/scheduler_plugins.go

andrewsykim · 2025-05-29T16:13:52Z

ray-operator/controllers/ray/batchscheduler/scheduler-plugins/scheduler_plugins.go

+
+// AddMetadataToPod adds essential labels and annotations to the Ray pods
+// the scheduler needs these labels and annotations in order to do the scheduling properly
+func (k *KubeScheduler) AddMetadataToPod(_ context.Context, app *rayv1.RayCluster, groupName string, pod *corev1.Pod) {


s/app/cluster

Could you please explain the comment? Thank you!

andrewsykim · 2025-05-29T16:14:41Z

ray-operator/controllers/ray/batchscheduler/scheduler-plugins/scheduler_plugins.go

+	// when gang scheduling is enabled, extra annotations need to be added to all pods
+	if k.isGangSchedulingEnabled(app) {
+		// the group name for the head and each of the worker group should be different
+		pod.Labels[KubeSchedulerPodGroupLabelKey] = app.Name


Should PodGroups be scheduled at the worker group level or RayCluster level? I feel like worker group level could make more sense in some cases

If the head is not available, the workers will be blocked, this is unacceptable for my customers. So I think the head should be checked with the workers.

MortalHappiness · 2025-05-30T03:59:59Z

Please also resolve conflicts. We now use single go.mod in the repo root. Thanks.

MortalHappiness

You also need to add permission for creating PodGroup here

kuberay/helm-chart/kuberay-operator/templates/_helpers.tpl

Line 121 in 9658af3

rules:

helm-chart/kuberay-operator/values.yaml

MortalHappiness · 2025-05-30T09:51:30Z

ray-operator/controllers/ray/batchscheduler/scheduler-plugins/scheduler_plugins_test.go

+func TestCalculateDesiredResources(t *testing.T) {
+	a := assert.New(t)
+
+	cluster := createTestRayCluster(1)
+
+	totalResource := utils.CalculateDesiredResources(&cluster)
+
+	// 256m * 3 (requests, not limits)
+	a.Equal("768m", totalResource.Cpu().String())
+
+	// 256Mi * 3 (requests, not limits)
+	a.Equal("768Mi", totalResource.Memory().String())
+
+	// 2 GPUs total
+	a.Equal("2", totalResource.Name("nvidia.com/gpu", resource.BinarySI).String())
+}


What are you testing here? It seems that you didn't test anything specific to the kube scheduler plugin.

Currently we only calculate the min-resource and create the podgroup. The functionality of creating the podgroup is completed by the client. So in unit test we just need to test the logic of calculate the min-resource.

Could you refer to this test and this function, extract the create PodGroup logic into a separate function, and then test whether the returned PodGroup spec is correct in the unit test?

kuberay/ray-operator/controllers/ray/batchscheduler/volcano/volcano_scheduler_test.go

Lines 81 to 103 in 2f2c1a2

func TestCreatePodGroup(t *testing.T) {

a := assert.New(t)

cluster := createTestRayCluster(1)

minMember := utils.CalculateDesiredReplicas(context.Background(), &cluster) + 1

totalResource := utils.CalculateDesiredResources(&cluster)

pg := createPodGroup(&cluster, getAppPodGroupName(&cluster), minMember, totalResource)

a.Equal(cluster.Namespace, pg.Namespace)

// 1 head + 2 workers (desired, not min replicas)

a.Equal(int32(3), pg.Spec.MinMember)

// 256m * 3 (requests, not limits)

a.Equal("768m", pg.Spec.MinResources.Cpu().String())

// 256Mi * 3 (requests, not limits)

a.Equal("768Mi", pg.Spec.MinResources.Memory().String())

// 2 GPUs total

a.Equal("2", pg.Spec.MinResources.Name("nvidia.com/gpu", resource.BinarySI).String())

}

kuberay/ray-operator/controllers/ray/batchscheduler/volcano/volcano_scheduler.go

Lines 100 to 132 in a068e7b

func createPodGroup(

app *rayv1.RayCluster,

podGroupName string,

size int32,

totalResource corev1.ResourceList,

) v1beta1.PodGroup {

podGroup := v1beta1.PodGroup{

ObjectMeta: metav1.ObjectMeta{

Namespace: app.Namespace,

Name: podGroupName,

OwnerReferences: []metav1.OwnerReference{

*metav1.NewControllerRef(app, rayv1.SchemeGroupVersion.WithKind("RayCluster")),

},

},

Spec: v1beta1.PodGroupSpec{

MinMember: size,

MinResources: &totalResource,

},

Status: v1beta1.PodGroupStatus{

Phase: v1beta1.PodGroupPending,

},

}

if queue, ok := app.ObjectMeta.Labels[QueueNameLabelKey]; ok {

podGroup.Spec.Queue = queue

}

if priorityClassName, ok := app.ObjectMeta.Labels[utils.RayPriorityClassName]; ok {

podGroup.Spec.PriorityClassName = priorityClassName

}

return podGroup

}

MortalHappiness · 2025-05-30T09:52:32Z

Please also install pre-commit locally and then fix the CI lint error. Thanks.

kevin85421 · 2025-05-31T00:35:31Z

I discussed this with @MortalHappiness offline. Since this PR still requires some work before it can be merged, I’ve removed the release-blocker label. We can consider cherry-pick this PR after branch cut.

Signed-off-by: kunwuluan <kunwuluan@gmail.com>

update ValidateBatchSchedulerConfig() update helm chart Rename the function. Signed-off-by: kunwuluan <kunwuluan@gmail.com>

… start the operator. Signed-off-by: kunwuluan <kunwuluan@gmail.com>

Signed-off-by: KunWuLuan <kunwuluan@gmail.com>

kevin85421 · 2025-06-03T07:01:18Z

@MortalHappiness I chatted with @KunWuLuan offline. We will try to include this into 1.4.0. This is not branch cut blocker. Please review this PR.

MortalHappiness · 2025-06-03T14:49:00Z

Overall LGTM. But I don't know what of this test does as I mentioned above #3612 (comment)

ray-operator/config/samples/ray-cluster.kube-scheduler.yaml

helm-chart/kuberay-operator/templates/_helpers.tpl

helm-chart/kuberay-operator/values.yaml

ray-operator/controllers/ray/batchscheduler/scheduler-plugins/scheduler_plugins.go

kevin85421 · 2025-06-05T02:19:32Z

ray-operator/controllers/ray/batchscheduler/scheduler-plugins/scheduler_plugins.go

+}
+
+func (kf *KubeSchedulerFactory) ConfigureReconciler(b *builder.Builder) *builder.Builder {
+	return b


should we configure reconciler so that the informer cache has the information of PodGroup?

ray-operator/controllers/ray/batchscheduler/scheduler-plugins/scheduler_plugins.go

kevin85421 · 2025-06-05T02:25:32Z

ray-operator/controllers/ray/batchscheduler/scheduler-plugins/scheduler_plugins.go

+		}
+	}
+
+	scheme := runtime.NewScheme()


can we reuse the controller's informer cache? If this is non-trivial, we don't need to address this in this PR.

TODO: Volcano seems to call K8s API server for each reconciliation.

I will create a new issue to track this.

Signed-off-by: KunWuLuan <kunwuluan@gmail.com>

MortalHappiness · 2025-06-07T01:18:59Z

Hi @KunWuLuan Could you resolve the conflicts. Thanks!

MortalHappiness

LGTM.

#3612 (comment) can be addressed in follow-up PRs.

…duler-plugins Signed-off-by: kaihsun <kaihsun@anyscale.com>

Signed-off-by: kaihsun <kaihsun@anyscale.com>

kevin85421 · 2025-06-12T08:59:44Z

@MortalHappiness I added some TODOs and did some refactoring. Would you mind reviewing another pass?

Manually test:

outdated

* support scheduler plugins Signed-off-by: kunwuluan <kunwuluan@gmail.com> * add unit test update ValidateBatchSchedulerConfig() update helm chart Rename the function. Signed-off-by: kunwuluan <kunwuluan@gmail.com> * Update the role in helm chart. And ensure the crd is installed before start the operator. Signed-off-by: kunwuluan <kunwuluan@gmail.com> * Fix CI lint Signed-off-by: KunWuLuan <kunwuluan@gmail.com> * Modify ray version in raycluster sample. Signed-off-by: KunWuLuan <kunwuluan@gmail.com> * Update the scheduler name Signed-off-by: KunWuLuan <kunwuluan@gmail.com> * Update the test Signed-off-by: KunWuLuan <kunwuluan@gmail.com> * update and add TODOs Signed-off-by: kaihsun <kaihsun@anyscale.com> --------- Signed-off-by: kunwuluan <kunwuluan@gmail.com> Signed-off-by: KunWuLuan <kunwuluan@gmail.com> Signed-off-by: kaihsun <kaihsun@anyscale.com> Co-authored-by: yueming.wk <yueming.wk@alibaba-inc.com> Co-authored-by: kaihsun <kaihsun@anyscale.com>

* support scheduler plugins * add unit test update ValidateBatchSchedulerConfig() update helm chart Rename the function. * Update the role in helm chart. And ensure the crd is installed before start the operator. * Fix CI lint * Modify ray version in raycluster sample. * Update the scheduler name * Update the test * update and add TODOs --------- Signed-off-by: kunwuluan <kunwuluan@gmail.com> Signed-off-by: KunWuLuan <kunwuluan@gmail.com> Signed-off-by: kaihsun <kaihsun@anyscale.com> Co-authored-by: GreenHand <kunwuluan@gmail.com> Co-authored-by: yueming.wk <yueming.wk@alibaba-inc.com>

* support scheduler plugins Signed-off-by: kunwuluan <kunwuluan@gmail.com> * add unit test update ValidateBatchSchedulerConfig() update helm chart Rename the function. Signed-off-by: kunwuluan <kunwuluan@gmail.com> * Update the role in helm chart. And ensure the crd is installed before start the operator. Signed-off-by: kunwuluan <kunwuluan@gmail.com> * Fix CI lint Signed-off-by: KunWuLuan <kunwuluan@gmail.com> * Modify ray version in raycluster sample. Signed-off-by: KunWuLuan <kunwuluan@gmail.com> * Update the scheduler name Signed-off-by: KunWuLuan <kunwuluan@gmail.com> * Update the test Signed-off-by: KunWuLuan <kunwuluan@gmail.com> * update and add TODOs Signed-off-by: kaihsun <kaihsun@anyscale.com> --------- Signed-off-by: kunwuluan <kunwuluan@gmail.com> Signed-off-by: KunWuLuan <kunwuluan@gmail.com> Signed-off-by: kaihsun <kaihsun@anyscale.com> Co-authored-by: yueming.wk <yueming.wk@alibaba-inc.com> Co-authored-by: kaihsun <kaihsun@anyscale.com>

KunWuLuan changed the title ~~support scheduler plugins~~ (WIP)support scheduler plugins May 16, 2025

KunWuLuan force-pushed the feat/support-scheduler-plugins branch 6 times, most recently from 55d376d to a054ab9 Compare May 21, 2025 04:03

KunWuLuan changed the title ~~(WIP)support scheduler plugins~~ support scheduler plugins May 27, 2025

kevin85421 assigned kevin85421 and MortalHappiness May 27, 2025

kevin85421 added 1.4.0 release-blocker labels May 27, 2025

MortalHappiness reviewed May 29, 2025

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KunWuLuan force-pushed the feat/support-scheduler-plugins branch from 34d3f44 to a8048b0 Compare May 29, 2025 15:15

andrewsykim previously requested changes May 29, 2025

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KunWuLuan force-pushed the feat/support-scheduler-plugins branch from a8048b0 to 21f4f88 Compare May 30, 2025 08:59

MortalHappiness reviewed May 30, 2025

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kevin85421 removed the release-blocker label May 31, 2025

KunWuLuan force-pushed the feat/support-scheduler-plugins branch 3 times, most recently from 7c572f7 to 1e40ceb Compare May 31, 2025 06:31

support scheduler plugins

ee267a7

Signed-off-by: kunwuluan <kunwuluan@gmail.com>

KunWuLuan added 2 commits June 3, 2025 12:02

add unit test

58d32d8

update ValidateBatchSchedulerConfig() update helm chart Rename the function. Signed-off-by: kunwuluan <kunwuluan@gmail.com>

Update the role in helm chart. And ensure the crd is installed before…

4687f2e

… start the operator. Signed-off-by: kunwuluan <kunwuluan@gmail.com>

KunWuLuan force-pushed the feat/support-scheduler-plugins branch 2 times, most recently from 7809c0c to 505402b Compare June 3, 2025 05:37

Fix CI lint

21baca2

Signed-off-by: KunWuLuan <kunwuluan@gmail.com>

KunWuLuan force-pushed the feat/support-scheduler-plugins branch from 505402b to 21baca2 Compare June 3, 2025 05:48

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KunWuLuan force-pushed the feat/support-scheduler-plugins branch from 5b51e56 to b8d029c Compare June 5, 2025 03:14

yueming.wk added 3 commits June 6, 2025 09:29

Modify ray version in raycluster sample.

d4c3a44

Signed-off-by: KunWuLuan <kunwuluan@gmail.com>

Update the scheduler name

b39f453

Signed-off-by: KunWuLuan <kunwuluan@gmail.com>

Update the test

f5fc6de

Signed-off-by: KunWuLuan <kunwuluan@gmail.com>

KunWuLuan force-pushed the feat/support-scheduler-plugins branch from b8d029c to f5fc6de Compare June 6, 2025 01:31

MortalHappiness approved these changes Jun 10, 2025

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kevin85421 added 2 commits June 11, 2025 07:31

Merge remote-tracking branch 'upstream/master' into feat/support-sche…

98b6196

…duler-plugins Signed-off-by: kaihsun <kaihsun@anyscale.com>

update and add TODOs

564ec79

Signed-off-by: kaihsun <kaihsun@anyscale.com>

kevin85421 merged commit e80e84b into ray-project:master Jun 12, 2025
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kevin85421 mentioned this pull request Jun 12, 2025

[Feature] Support PodGroup API #3611

Closed

2 tasks

	# Enable customized Kubernetes scheduler integration. If enabled, Ray workloads will be scheduled
	# by the customized scheduler.
	# * "enabled" is the legacy option and will be deprecated soon.
	# * "name" is the standard option, expecting a scheduler name, supported values are
	# "default", "volcano", and "yunikorn".
	#
	# Note: "enabled" and "name" should not be set at the same time. If both are set, an error will be thrown.
	#
	# Examples:
	# 1. Use volcano (deprecated)
	# batchScheduler:
	# enabled: true
	#
	# 2. Use volcano
	# batchScheduler:
	# name: volcano
	#
	# 3. Use yunikorn
	# batchScheduler:
	# name: yunikorn
	#
	batchScheduler:
	# Deprecated. This option will be removed in the future.
	# Note, for backwards compatibility. When it sets to true, it enables volcano scheduler integration.
	enabled: false
	# Set the customized scheduler name, supported values are "volcano" or "yunikorn", do not set
	# "batchScheduler.enabled=true" at the same time as it will override this option.
	name: ""

	RaySchedulerName = "ray.io/scheduler-name"
	RayPriorityClassName = "ray.io/priority-class-name"
	RayClusterGangSchedulingEnabled = "ray.io/gang-scheduling-enabled"

	func TestCreatePodGroup(t *testing.T) {
	a := assert.New(t)

	cluster := createTestRayCluster(1)

	minMember := utils.CalculateDesiredReplicas(context.Background(), &cluster) + 1
	totalResource := utils.CalculateDesiredResources(&cluster)
	pg := createPodGroup(&cluster, getAppPodGroupName(&cluster), minMember, totalResource)

	a.Equal(cluster.Namespace, pg.Namespace)

	// 1 head + 2 workers (desired, not min replicas)
	a.Equal(int32(3), pg.Spec.MinMember)

	// 256m * 3 (requests, not limits)
	a.Equal("768m", pg.Spec.MinResources.Cpu().String())

	// 256Mi * 3 (requests, not limits)
	a.Equal("768Mi", pg.Spec.MinResources.Memory().String())

	// 2 GPUs total
	a.Equal("2", pg.Spec.MinResources.Name("nvidia.com/gpu", resource.BinarySI).String())
	}

	func createPodGroup(
	app *rayv1.RayCluster,
	podGroupName string,
	size int32,
	totalResource corev1.ResourceList,
	) v1beta1.PodGroup {
	podGroup := v1beta1.PodGroup{
	ObjectMeta: metav1.ObjectMeta{
	Namespace: app.Namespace,
	Name: podGroupName,
	OwnerReferences: []metav1.OwnerReference{
	*metav1.NewControllerRef(app, rayv1.SchemeGroupVersion.WithKind("RayCluster")),
	},
	},
	Spec: v1beta1.PodGroupSpec{
	MinMember: size,
	MinResources: &totalResource,
	},
	Status: v1beta1.PodGroupStatus{
	Phase: v1beta1.PodGroupPending,
	},
	}

	if queue, ok := app.ObjectMeta.Labels[QueueNameLabelKey]; ok {
	podGroup.Spec.Queue = queue
	}

	if priorityClassName, ok := app.ObjectMeta.Labels[utils.RayPriorityClassName]; ok {
	podGroup.Spec.PriorityClassName = priorityClassName
	}

	return podGroup
	}

support scheduler plugins #3612

support scheduler plugins #3612

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