defaultpreemption

Documentation

Index

• Constants
• func New(_ context.Context, dpArgs runtime.Object, fh framework.Handle, ...) (framework.Plugin, error)
• type DefaultPreemption
  • func (pl *DefaultPreemption) CandidatesToVictimsMap(candidates []preemption.Candidate) map[string]*extenderv1.Victims
  • func (pl *DefaultPreemption) GetOffsetAndNumCandidates(numNodes int32) (int32, int32)
  • func (pl *DefaultPreemption) Name() string
  • func (pl *DefaultPreemption) OrderedScoreFuncs(ctx context.Context, nodesToVictims map[string]*extenderv1.Victims) []func(node string) int64
  • func (pl *DefaultPreemption) PodEligibleToPreemptOthers(pod *v1.Pod, nominatedNodeStatus *framework.Status) (bool, string)
  • func (pl *DefaultPreemption) PostFilter(ctx context.Context, state *framework.CycleState, pod *v1.Pod, ...) (*framework.PostFilterResult, *framework.Status)
  • func (pl *DefaultPreemption) SelectVictimsOnNode(ctx context.Context, state *framework.CycleState, pod *v1.Pod, ...) ([]*v1.Pod, int, *framework.Status)

Constants

const Name = names.DefaultPreemption

Name of the plugin used in the plugin registry and configurations.

Functions

func New

func New(_ context.Context, dpArgs runtime.Object, fh framework.Handle, fts feature.Features) (framework.Plugin, error)

New initializes a new plugin and returns it.

Types

type DefaultPreemption

type DefaultPreemption struct {
	// contains filtered or unexported fields
}

DefaultPreemption is a PostFilter plugin implements the preemption logic.

func (*DefaultPreemption) CandidatesToVictimsMap

func (pl *DefaultPreemption) CandidatesToVictimsMap(candidates []preemption.Candidate) map[string]*extenderv1.Victims

This function is not applicable for out-of-tree preemption plugins that exercise different preemption candidates on the same nominated node.

func (*DefaultPreemption) GetOffsetAndNumCandidates

func (pl *DefaultPreemption) GetOffsetAndNumCandidates(numNodes int32) (int32, int32)

GetOffsetAndNumCandidates chooses a random offset and calculates the number of candidates that should be shortlisted for dry running preemption.

func (*DefaultPreemption) Name

func (pl *DefaultPreemption) Name() string

Name returns name of the plugin. It is used in logs, etc.

func (*DefaultPreemption) OrderedScoreFuncs

func (pl *DefaultPreemption) OrderedScoreFuncs(ctx context.Context, nodesToVictims map[string]*extenderv1.Victims) []func(node string) int64

OrderedScoreFuncs returns a list of ordered score functions to select preferable node where victims will be preempted.

func (*DefaultPreemption) PodEligibleToPreemptOthers

func (pl *DefaultPreemption) PodEligibleToPreemptOthers(pod *v1.Pod, nominatedNodeStatus *framework.Status) (bool, string)

PodEligibleToPreemptOthers returns one bool and one string. The bool indicates whether this pod should be considered for preempting other pods or not. The string includes the reason if this pod isn't eligible. There're several reasons:

1. The pod has a preemptionPolicy of Never.
2. The pod has already preempted other pods and the victims are in their graceful termination period. Currently we check the node that is nominated for this pod, and as long as there are terminating pods on this node, we don't attempt to preempt more pods.

func (*DefaultPreemption) PostFilter

func (pl *DefaultPreemption) PostFilter(ctx context.Context, state *framework.CycleState, pod *v1.Pod, m framework.NodeToStatusMap) (*framework.PostFilterResult, *framework.Status)

PostFilter invoked at the postFilter extension point.

func (*DefaultPreemption) SelectVictimsOnNode

func (pl *DefaultPreemption) SelectVictimsOnNode(
	ctx context.Context,
	state *framework.CycleState,
	pod *v1.Pod,
	nodeInfo *framework.NodeInfo,
	pdbs []*policy.PodDisruptionBudget) ([]*v1.Pod, int, *framework.Status)

SelectVictimsOnNode finds minimum set of pods on the given node that should be preempted in order to make enough room for "pod" to be scheduled.