scheduler

Documentation

Index

• Constants
• Variables
• func Equal(e1, e2 *HTTPExtender) bool
• func MakeDefaultErrorFunc(client clientset.Interface, podLister corelisters.PodLister, ...) func(*framework.QueuedPodInfo, error)
• func NewHTTPExtender(config *schedulerapi.Extender) (framework.Extender, error)
• func NewInformerFactory(cs clientset.Interface, resyncPeriod time.Duration) informers.SharedInformerFactory
• type Binder
• type Configurator
• type FrameworkCapturer
• type HTTPExtender
  • func (h *HTTPExtender) Bind(binding *v1.Binding) error
  • func (h *HTTPExtender) Filter(pod *v1.Pod, nodes []*v1.Node) (filteredList []*v1.Node, ...)
  • func (h *HTTPExtender) IsBinder() bool
  • func (h *HTTPExtender) IsIgnorable() bool
  • func (h *HTTPExtender) IsInterested(pod *v1.Pod) bool
  • func (h *HTTPExtender) Name() string
  • func (h *HTTPExtender) Prioritize(pod *v1.Pod, nodes []*v1.Node) (*extenderv1.HostPriorityList, int64, error)
  • func (h *HTTPExtender) ProcessPreemption(pod *v1.Pod, nodeNameToVictims map[string]*extenderv1.Victims, ...) (map[string]*extenderv1.Victims, error)
  • func (h *HTTPExtender) SupportsPreemption() bool
• type Option
  • func WithBuildFrameworkCapturer(fc FrameworkCapturer) Option
  • func WithComponentConfigVersion(apiVersion string) Option
  • func WithExtenders(e ...schedulerapi.Extender) Option
  • func WithFrameworkOutOfTreeRegistry(registry frameworkruntime.Registry) Option
  • func WithKubeConfig(cfg *restclient.Config) Option
  • func WithLegacyPolicySource(source *schedulerapi.SchedulerPolicySource) Option
  • func WithParallelism(threads int32) Option
  • func WithPercentageOfNodesToScore(percentageOfNodesToScore int32) Option
  • func WithPodInitialBackoffSeconds(podInitialBackoffSeconds int64) Option
  • func WithPodMaxBackoffSeconds(podMaxBackoffSeconds int64) Option
  • func WithProfiles(p ...schedulerapi.KubeSchedulerProfile) Option
• type ScheduleAlgorithm
  • func NewGenericScheduler(cache internalcache.Cache, nodeInfoSnapshot *internalcache.Snapshot, ...) ScheduleAlgorithm
• type ScheduleResult
• type Scheduler
  • func New(client clientset.Interface, informerFactory informers.SharedInformerFactory, ...) (*Scheduler, error)
  • func (sched *Scheduler) Run(ctx context.Context)

Constants

const (
	// DefaultExtenderTimeout defines the default extender timeout in second.
	DefaultExtenderTimeout = 5 * time.Second
)

const (
	// SchedulerError is the reason recorded for events when an error occurs during scheduling a pod.
	SchedulerError = "SchedulerError"
)

Variables

var ErrNoNodesAvailable = fmt.Errorf("no nodes available to schedule pods")

ErrNoNodesAvailable is used to describe the error that no nodes available to schedule pods.

Functions

func Equal

func Equal(e1, e2 *HTTPExtender) bool

Equal is used to check if two extenders are equal ignoring the client field, exported for testing

func MakeDefaultErrorFunc

func MakeDefaultErrorFunc(client clientset.Interface, podLister corelisters.PodLister, podQueue internalqueue.SchedulingQueue, schedulerCache internalcache.Cache) func(*framework.QueuedPodInfo, error)

MakeDefaultErrorFunc construct a function to handle pod scheduler error

func NewHTTPExtender

func NewHTTPExtender(config *schedulerapi.Extender) (framework.Extender, error)

NewHTTPExtender creates an HTTPExtender object.

func NewInformerFactory

func NewInformerFactory(cs clientset.Interface, resyncPeriod time.Duration) informers.SharedInformerFactory

NewInformerFactory creates a SharedInformerFactory and initializes a scheduler specific in-place podInformer.

Types

type Binder

type Binder interface {
	Bind(binding *v1.Binding) error
}

Binder knows how to write a binding.

type Configurator

type Configurator struct {

	// Close this to stop all reflectors
	StopEverything <-chan struct{}
	// contains filtered or unexported fields
}

Configurator defines I/O, caching, and other functionality needed to construct a new scheduler.

type FrameworkCapturer

type FrameworkCapturer func(schedulerapi.KubeSchedulerProfile)

FrameworkCapturer is used for registering a notify function in building framework.

type HTTPExtender

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

HTTPExtender implements the Extender interface.

func (*HTTPExtender) Bind

func (h *HTTPExtender) Bind(binding *v1.Binding) error

Bind delegates the action of binding a pod to a node to the extender.

func (*HTTPExtender) Filter

func (h *HTTPExtender) Filter(
	pod *v1.Pod,
	nodes []*v1.Node,
) (filteredList []*v1.Node, failedNodes, failedAndUnresolvableNodes extenderv1.FailedNodesMap, err error)

Filter based on extender implemented predicate functions. The filtered list is expected to be a subset of the supplied list; otherwise the function returns an error. The failedNodes and failedAndUnresolvableNodes optionally contains the list of failed nodes and failure reasons, except nodes in the latter are unresolvable.

func (*HTTPExtender) IsBinder

func (h *HTTPExtender) IsBinder() bool

IsBinder returns whether this extender is configured for the Bind method.

func (*HTTPExtender) IsIgnorable

func (h *HTTPExtender) IsIgnorable() bool

IsIgnorable returns true indicates scheduling should not fail when this extender is unavailable

func (*HTTPExtender) IsInterested

func (h *HTTPExtender) IsInterested(pod *v1.Pod) bool

IsInterested returns true if at least one extended resource requested by this pod is managed by this extender.

func (*HTTPExtender) Name

func (h *HTTPExtender) Name() string

Name returns extenderURL to identify the extender.

func (*HTTPExtender) Prioritize

func (h *HTTPExtender) Prioritize(pod *v1.Pod, nodes []*v1.Node) (*extenderv1.HostPriorityList, int64, error)

Prioritize based on extender implemented priority functions. Weight*priority is added up for each such priority function. The returned score is added to the score computed by Kubernetes scheduler. The total score is used to do the host selection.

func (*HTTPExtender) ProcessPreemption

func (h *HTTPExtender) ProcessPreemption(
	pod *v1.Pod,
	nodeNameToVictims map[string]*extenderv1.Victims,
	nodeInfos framework.NodeInfoLister,
) (map[string]*extenderv1.Victims, error)

ProcessPreemption returns filtered candidate nodes and victims after running preemption logic in extender.

func (*HTTPExtender) SupportsPreemption

func (h *HTTPExtender) SupportsPreemption() bool

SupportsPreemption returns true if an extender supports preemption. An extender should have preempt verb defined and enabled its own node cache.

type Option

type Option func(*schedulerOptions)

Option configures a Scheduler

func WithBuildFrameworkCapturer

func WithBuildFrameworkCapturer(fc FrameworkCapturer) Option

WithBuildFrameworkCapturer sets a notify function for getting buildFramework details.

func WithComponentConfigVersion

func WithComponentConfigVersion(apiVersion string) Option

WithComponentConfigVersion sets the component config version to the KubeSchedulerConfiguration version used. The string should be the full scheme group/version of the external type we converted from (for example "kubescheduler.config.k8s.io/v1beta2")

func WithExtenders

func WithExtenders(e ...schedulerapi.Extender) Option

WithExtenders sets extenders for the Scheduler

func WithFrameworkOutOfTreeRegistry

func WithFrameworkOutOfTreeRegistry(registry frameworkruntime.Registry) Option

WithFrameworkOutOfTreeRegistry sets the registry for out-of-tree plugins. Those plugins will be appended to the default registry.

func WithKubeConfig

func WithKubeConfig(cfg *restclient.Config) Option

WithKubeConfig sets the kube config for Scheduler.

func WithLegacyPolicySource

func WithLegacyPolicySource(source *schedulerapi.SchedulerPolicySource) Option

WithLegacyPolicySource sets legacy policy config file source.

func WithParallelism

func WithParallelism(threads int32) Option

WithParallelism sets the parallelism for all scheduler algorithms. Default is 16.

func WithPercentageOfNodesToScore

func WithPercentageOfNodesToScore(percentageOfNodesToScore int32) Option

WithPercentageOfNodesToScore sets percentageOfNodesToScore for Scheduler, the default value is 50

func WithPodInitialBackoffSeconds

func WithPodInitialBackoffSeconds(podInitialBackoffSeconds int64) Option

WithPodInitialBackoffSeconds sets podInitialBackoffSeconds for Scheduler, the default value is 1

func WithPodMaxBackoffSeconds

func WithPodMaxBackoffSeconds(podMaxBackoffSeconds int64) Option

WithPodMaxBackoffSeconds sets podMaxBackoffSeconds for Scheduler, the default value is 10

func WithProfiles

func WithProfiles(p ...schedulerapi.KubeSchedulerProfile) Option

WithProfiles sets profiles for Scheduler. By default, there is one profile with the name "default-scheduler".

type ScheduleAlgorithm

type ScheduleAlgorithm interface {
	Schedule(context.Context, []framework.Extender, framework.Framework, *framework.CycleState, *v1.Pod) (scheduleResult ScheduleResult, err error)
}

ScheduleAlgorithm is an interface implemented by things that know how to schedule pods onto machines. TODO: Rename this type.

func NewGenericScheduler

func NewGenericScheduler(
	cache internalcache.Cache,
	nodeInfoSnapshot *internalcache.Snapshot,
	percentageOfNodesToScore int32) ScheduleAlgorithm

NewGenericScheduler creates a genericScheduler object.

type ScheduleResult

type ScheduleResult struct {
	// Name of the scheduler suggest host
	SuggestedHost string
	// Number of nodes scheduler evaluated on one pod scheduled
	EvaluatedNodes int
	// Number of feasible nodes on one pod scheduled
	FeasibleNodes int
}

ScheduleResult represents the result of one pod scheduled. It will contain the final selected Node, along with the selected intermediate information.

type Scheduler

type Scheduler struct {
	// It is expected that changes made via SchedulerCache will be observed
	// by NodeLister and Algorithm.
	SchedulerCache internalcache.Cache

	Algorithm ScheduleAlgorithm

	Extenders []framework.Extender

	// NextPod should be a function that blocks until the next pod
	// is available. We don't use a channel for this, because scheduling
	// a pod may take some amount of time and we don't want pods to get
	// stale while they sit in a channel.
	NextPod func() *framework.QueuedPodInfo

	// Error is called if there is an error. It is passed the pod in
	// question, and the error
	Error func(*framework.QueuedPodInfo, error)

	// Close this to shut down the scheduler.
	StopEverything <-chan struct{}

	// SchedulingQueue holds pods to be scheduled
	SchedulingQueue internalqueue.SchedulingQueue

	// Profiles are the scheduling profiles.
	Profiles profile.Map
	// contains filtered or unexported fields
}

Scheduler watches for new unscheduled pods. It attempts to find nodes that they fit on and writes bindings back to the api server.

func New

func New(client clientset.Interface,
	informerFactory informers.SharedInformerFactory,
	recorderFactory profile.RecorderFactory,
	stopCh <-chan struct{},
	opts ...Option) (*Scheduler, error)

New returns a Scheduler

func (*Scheduler) Run

func (sched *Scheduler) Run(ctx context.Context)

Run begins watching and scheduling. It starts scheduling and blocked until the context is done.