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Package defaultpreemption

Constants

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

const Name = names.DefaultPreemption

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.

type DefaultPreemption ¶

DefaultPreemption is a PostFilter plugin implements the preemption logic.

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

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.