scheduler

Documentation

Index

• type Binder
• type Config
• type Configurator
• type PodConditionUpdater
• type Scheduler
  • func New(c *Config) *Scheduler
  • func NewFromConfigurator(c Configurator, modifiers ...func(c *Config)) (*Scheduler, error)
  • func (sched *Scheduler) Config() *Config
  • func (sched *Scheduler) Run()
  • func (sched *Scheduler) StopEverything()

Types

type Binder

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

Binder knows how to write a binding.

type Config

type Config struct {
	// It is expected that changes made via SchedulerCache will be observed
	// by NodeLister and Algorithm.
	SchedulerCache schedulercache.Cache
	// Ecache is used for optimistically invalid affected cache items after
	// successfully binding a pod
	Ecache     *core.EquivalenceCache
	NodeLister algorithm.NodeLister
	Algorithm  algorithm.ScheduleAlgorithm
	Binder     Binder
	// PodConditionUpdater is used only in case of scheduling errors. If we succeed
	// with scheduling, PodScheduled condition will be updated in apiserver in /bind
	// handler so that binding and setting PodCondition it is atomic.
	PodConditionUpdater PodConditionUpdater

	// 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() *v1.Pod

	// Error is called if there is an error. It is passed the pod in
	// question, and the error
	Error func(*v1.Pod, error)

	// Recorder is the EventRecorder to use
	Recorder record.EventRecorder

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

Config is an implementation of the Scheduler's configured input data. TODO over time we should make this struct a hidden implementation detail of the scheduler.

type Configurator

type Configurator interface {
	GetPriorityFunctionConfigs(priorityKeys sets.String) ([]algorithm.PriorityConfig, error)
	GetPriorityMetadataProducer() (algorithm.MetadataProducer, error)
	GetPredicateMetadataProducer() (algorithm.MetadataProducer, error)
	GetPredicates(predicateKeys sets.String) (map[string]algorithm.FitPredicate, error)
	GetHardPodAffinitySymmetricWeight() int
	GetSchedulerName() string
	MakeDefaultErrorFunc(backoff *util.PodBackoff, podQueue *cache.FIFO) func(pod *v1.Pod, err error)

	// Probably doesn't need to be public.  But exposed for now in case.
	ResponsibleForPod(pod *v1.Pod) bool

	// Needs to be exposed for things like integration tests where we want to make fake nodes.
	GetNodeLister() corelisters.NodeLister
	GetClient() clientset.Interface
	GetScheduledPodLister() corelisters.PodLister
	Run()

	Create() (*Config, error)
	CreateFromProvider(providerName string) (*Config, error)
	CreateFromConfig(policy schedulerapi.Policy) (*Config, error)
	CreateFromKeys(predicateKeys, priorityKeys sets.String, extenders []algorithm.SchedulerExtender) (*Config, error)
}

Configurator defines I/O, caching, and other functionality needed to construct a new scheduler. An implementation of this can be seen in factory.go.

type PodConditionUpdater

type PodConditionUpdater interface {
	Update(pod *v1.Pod, podCondition *v1.PodCondition) error
}

PodConditionUpdater updates the condition of a pod based on the passed PodCondition

type Scheduler

type Scheduler struct {
	// 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(c *Config) *Scheduler

New returns a new scheduler. TODO replace this with NewFromConfigurator.

func NewFromConfigurator

func NewFromConfigurator(c Configurator, modifiers ...func(c *Config)) (*Scheduler, error)

NewFromConfigurator returns a new scheduler that is created entirely by the Configurator. Assumes Create() is implemented. Supports intermediate Config mutation for now if you provide modifier functions which will run after Config is created.

func (*Scheduler) Config

func (sched *Scheduler) Config() *Config

Config return scheduler's config pointer. It is exposed for testing purposes.

func (*Scheduler) Run

func (sched *Scheduler) Run()

Run begins watching and scheduling. It starts a goroutine and returns immediately.

func (*Scheduler) StopEverything

func (sched *Scheduler) StopEverything()

StopEverything closes the scheduler config's StopEverything channel, to shut down the Scheduler.