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Merge pull request #121950 from sanposhiho/doc-postfilter

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fix(framework): elaborate the document on PostFilter
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Kubernetes Prow Robot 2023-12-18 16:57:49 +01:00 committed by GitHub
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1 changed files with 13 additions and 2 deletions
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15
pkg/scheduler/framework/interface.go
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@ -95,12 +95,13 @@ const (
Unschedulable
// UnschedulableAndUnresolvable is used when a plugin finds a pod unschedulable and
// other postFilter plugins like preemption would not change anything.
// See the comment on PostFilter interface for more details about how PostFilter should handle this status.
// Plugins should return Unschedulable if it is possible that the pod can get scheduled
// after running other postFilter plugins.
// The accompanying status message should explain why the pod is unschedulable.
//
// We regard the backoff as a penalty of wasting the scheduling cycle.
// When the scheduling queue requeues Pods, which was rejected with Unschedulable in the last scheduling,
// When the scheduling queue requeues Pods, which was rejected with UnschedulableAndUnresolvable in the last scheduling,
// the Pod goes through backoff.
UnschedulableAndUnresolvable
// Wait is used when a Permit plugin finds a pod scheduling should wait.
@ -438,7 +439,17 @@ type FilterPlugin interface {
// after a pod cannot be scheduled.
type PostFilterPlugin interface {
Plugin
// PostFilter is called by the scheduling framework.
// PostFilter is called by the scheduling framework
// when the scheduling cycle failed at PreFilter or Filter by Unschedulable or UnschedulableAndUnresolvable.
// NodeToStatusMap has statuses that each Node got in the Filter phase.
// If this scheduling cycle failed at PreFilter, all Nodes have the status from the rejector PreFilter plugin in NodeToStatusMap.
// Note that the scheduling framework runs PostFilter plugins even when PreFilter returned UnschedulableAndUnresolvable.
// In that case, NodeToStatusMap contains all Nodes with UnschedulableAndUnresolvable.
//
// Also, ignoring Nodes with UnschedulableAndUnresolvable is the responsibility of each PostFilter plugin,
// meaning NodeToStatusMap obviously could have Nodes with UnschedulableAndUnresolvable
// and the scheduling framework does call PostFilter even when all Nodes in NodeToStatusMap are UnschedulableAndUnresolvable.
//
// A PostFilter plugin should return one of the following statuses:
// - Unschedulable: the plugin gets executed successfully but the pod cannot be made schedulable.
// - Success: the plugin gets executed successfully and the pod can be made schedulable.