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+---
+title: Add NonPreempting Option For PriorityClasses
+authors:
+  - "@vllry"
+owning-sig: sig-scheduling
+participating-sigs:
+  - sig-scheduling
+reviewers:
+  - "k82cn"
+  - "wgliang"
+approvers:
+  - "bsalamat"
+editor: Vallery Lancey
+creation-date: 2019-03-17
+last-updated: 2019-03-28
+status: implementable
+see-also:
+replaces:
+superseded-by:
+---
+
+# Allow PriorityClasses To Be Non-Preempting
+
+## Table of Contents
+
+* [Table of Contents](#table-of-contents)
+* [Summary](#summary)
+* [Motivation](#motivation)
+    * [Goals](#goals)
+    * [Non-Goals](#non-goals)
+* [Proposal](#proposal)
+    * [Risks and Mitigations](#risks-and-mitigations)
+* [Graduation Criteria](#graduation-criteria)
+* [Implementation History](#implementation-history)
+
+
+## Summary
+
+[PriorityClasses](https://kubernetes.io/docs/concepts/configuration/pod-priority-preemption/) 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.
+
+## Motivation
+
+Allowing PriorityClasses to be non-preempting is important for running batch workloads.
+
+Batch workloads typically have a backlog of work,
+with unscheduled pods.
+Higher-priority workloads can be assigned a higher priority via a PriorityClass,
+but this may result in pods with partially-completed work being preempted.
+Adding the non-preempting option allows users to prioritize the scheduling queue,
+without discarding incomplete work.
+
+### Goals
+
+Add a boolean to PriorityClasses,
+to enable or disable preemption for pods of that PriorityClass.
+
+### Non-Goals
+
+* Protecting pods from preemption. PodDisruptionBudget should be used.
+
+## Proposal
+
+Add a Preempting field to both PodSpec and PriorityClass.
+This field will default to true,
+for backwards compatibility.
+
+If Preempting is true for a pod,
+the scheduler will preempt lower priority pods to schedule this pod,
+as is current behavior.
+
+If Preempting is false,
+a pod of that priority will not preempt other pods.
+
+Setting the Preempting field in PriorityClass provides a straightforward interface,
+and allows ResourceQuotas to restrict preemption.
+
+PriorityClass type example:
+```
+type PriorityClass struct {
+	metav1.TypeMeta
+	metav1.ObjectMeta
+	Value int32
+	GlobalDefault bool
+	Description string
+	Preempting *bool // New option
+}
+```
+
+The Preempting field in PodSpec will be populated during pod admission,
+similarly to how the PriorityClass Value is populated.
+Storing the Preempting field in the pod spec has several benefits:
+* The scheduler does not need to be aware of PiorityClasses,
+as all relevant information is in the pod.
+* Mutating PriorityClass objects does not impact existing pods.
+* Kubelets can set Preempting on static pods.
+
+PodSpec type example:
+```
+type PodSpec struct {
+    ...
+    Preempting *bool
+    ...
+}
+```
+
+This feature should be gated in alpha, provisionally under the gate `NonPreemptingPriority`.
+
+Documentation must be updated to reflect the new feature,
+and changes to PriorityClass/PodSpec fields.
+
+### Risks and Mitigations
+
+The new feature may malfuction,
+or existing preemption functionality may be impaired.
+New tests (covering both nonpreepting workloads and mixed workloads),
+and the existing preempting PriorityClass tests should be used to prove stability.
+
+## Graduation Criteria
+
+**Typical user story:**
+A user is running batch workloads on a cluster.
+The user has a high-priority job,
+that they wish to schedule before other workloads in the queue.
+As the user does not want to preempt running batch workloads and discard work,
+the user creates the new workload with a high-priority,
+non-preempting PriorityClass.
+The new workload's pods are scheduled ahead of the queue,
+without disrupting running workloads.
+
+* Users are able to run preempting and non-preempting workloads in a stable manner,
+and are not requesting additional changes.
+* The feature has been stable and reliable in at least 2 releases.
+* Adequate documentation exists for preemption and the optional field.
+* Test coverage includes non-preempting use cases.
+* Conformance requirements for non-preempting PriorityClasses are agreed upon.
+
+## Testing Plan
+Add detailed unit and integration tests for nonpreempting workloads.
+
+Add basic e2e tests, to ensure all components are working together.
+
+Ensure existing tests (for preempting PriorityClasses) do not break.
+
+## Implementation History
+
+[Original Github issue](https://github.com/kubernetes/kubernetes/issues/67671)
+
+Pod Priority and Preemption are tracked as part of [enhancement#564](https://github.com/kubernetes/enhancements/issues/564).
+The proposal for Pod Priority can be [found here](https://github.com/kubernetes/community/blob/master/contributors/design-proposals/scheduling/pod-priority-api.md)
+and Preemption proposal is [here](https://github.com/kubernetes/community/blob/master/contributors/design-proposals/scheduling/pod-preemption.md).