scheduler

Documentation

Overview

The scheduler is responsible for placing virtual pod (VPod) replicas within real pods.

Index

• Variables
• func GetPlacementForPod(placements []duckv1alpha1.Placement, podName string) *duckv1alpha1.Placement
• func GetPodCount(placements []duckv1alpha1.Placement) int
• func GetTotalVReplicas(placements []duckv1alpha1.Placement) int32
• type Evictor
• type Scheduler
• type VPod
• type VPodLister

Variables

var (
	ErrNotEnoughReplicas = errors.New("scheduling failed (not enough pod replicas)")
)

Functions

func GetPlacementForPod

func GetPlacementForPod(placements []duckv1alpha1.Placement, podName string) *duckv1alpha1.Placement

GetPlacementForPod returns the placement corresponding to podName

func GetPodCount

func GetPodCount(placements []duckv1alpha1.Placement) int

GetPodCount returns the number of pods with the given placements

func GetTotalVReplicas

func GetTotalVReplicas(placements []duckv1alpha1.Placement) int32

GetTotalVReplicas returns the total number of placed virtual replicas

Types

type Evictor

type Evictor func(vpod VPod, from *duckv1alpha1.Placement) error

Evictor allows for vreplicas to be evicted. For instance, the evictor is used by the statefulset scheduler to move vreplicas to pod with a lower ordinal.

type Scheduler

type Scheduler interface {
	// Schedule computes the new set of placements for vpod.
	Schedule(vpod VPod) ([]duckv1alpha1.Placement, error)
}

Scheduler is responsible for placing VPods into real Kubernetes pods

type VPod

type VPod interface {
	// GetKey returns the VPod key (namespace/name).
	GetKey() types.NamespacedName

	// GetVReplicas returns the number of expected virtual replicas
	GetVReplicas() int32

	// GetPlacements returns the current list of placements
	// Do not mutate!
	GetPlacements() []duckv1alpha1.Placement
}

VPod represents virtual replicas placed into real Kubernetes pods The scheduler is responsible for placing VPods

type VPodLister

type VPodLister func() ([]VPod, error)

VPodLister is the function signature for returning a list of VPods