scheduler

Documentation

Index

• type Binder
• type Config
• type Configurator
• type FakeConfigurator
  • func (fc *FakeConfigurator) Create() (*Config, error)
  • func (fc *FakeConfigurator) CreateFromConfig(policy schedulerapi.Policy) (*Config, error)
  • func (fc *FakeConfigurator) CreateFromKeys(predicateKeys, priorityKeys sets.String, ...) (*Config, error)
  • func (fc *FakeConfigurator) CreateFromProvider(providerName string) (*Config, error)
  • func (fc *FakeConfigurator) GetClient() clientset.Interface
  • func (fc *FakeConfigurator) GetHardPodAffinitySymmetricWeight() int32
  • func (fc *FakeConfigurator) GetNodeLister() corelisters.NodeLister
  • func (fc *FakeConfigurator) GetPredicateMetadataProducer() (algorithm.PredicateMetadataProducer, error)
  • func (fc *FakeConfigurator) GetPredicates(predicateKeys sets.String) (map[string]algorithm.FitPredicate, error)
  • func (fc *FakeConfigurator) GetScheduledPodLister() corelisters.PodLister
  • func (fc *FakeConfigurator) MakeDefaultErrorFunc(backoff *util.PodBackoff, podQueue core.SchedulingQueue) func(pod *v1.Pod, err error)
• type PodConditionUpdater
• type PodPreemptor
• type Scheduler
  • func NewFromConfig(config *Config) *Scheduler
  • func NewFromConfigurator(c Configurator, modifiers ...func(c *Config)) (*Scheduler, error)
  • func (sched *Scheduler) Cache() schedulercache.Cache
  • 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     *equivalence.Cache
	NodeLister algorithm.NodeLister
	Algorithm  algorithm.ScheduleAlgorithm
	GetBinder  func(pod *v1.Pod) 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
	// PodPreemptor is used to evict pods and update pod annotations.
	PodPreemptor PodPreemptor

	// 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

	// WaitForCacheSync waits for scheduler cache to populate.
	// It returns true if it was successful, false if the controller should shutdown.
	WaitForCacheSync func() bool

	// 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{}

	// VolumeBinder handles PVC/PV binding for the pod.
	VolumeBinder *volumebinder.VolumeBinder

	// Disable pod preemption or not.
	DisablePreemption bool

	// SchedulingQueue holds pods to be scheduled
	SchedulingQueue core.SchedulingQueue
}

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 {
	// Exposed for testing
	GetHardPodAffinitySymmetricWeight() int32
	// Exposed for testing
	MakeDefaultErrorFunc(backoff *util.PodBackoff, podQueue core.SchedulingQueue) func(pod *v1.Pod, err error)

	// Predicate related accessors to be exposed for use by k8s.io/autoscaler/cluster-autoscaler
	GetPredicateMetadataProducer() (algorithm.PredicateMetadataProducer, error)
	GetPredicates(predicateKeys sets.String) (map[string]algorithm.FitPredicate, error)

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

	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 FakeConfigurator

type FakeConfigurator struct {
	Config *Config
}

FakeConfigurator is an implementation for test.

func (*FakeConfigurator) Create

func (fc *FakeConfigurator) Create() (*Config, error)

Create returns FakeConfigurator.Config

func (*FakeConfigurator) CreateFromConfig

func (fc *FakeConfigurator) CreateFromConfig(policy schedulerapi.Policy) (*Config, error)

CreateFromConfig returns FakeConfigurator.Config

func (*FakeConfigurator) CreateFromKeys

func (fc *FakeConfigurator) CreateFromKeys(predicateKeys, priorityKeys sets.String, extenders []algorithm.SchedulerExtender) (*Config, error)

CreateFromKeys returns FakeConfigurator.Config

func (*FakeConfigurator) CreateFromProvider

func (fc *FakeConfigurator) CreateFromProvider(providerName string) (*Config, error)

CreateFromProvider returns FakeConfigurator.Config

func (*FakeConfigurator) GetClient

func (fc *FakeConfigurator) GetClient() clientset.Interface

GetClient is not implemented yet.

func (*FakeConfigurator) GetHardPodAffinitySymmetricWeight

func (fc *FakeConfigurator) GetHardPodAffinitySymmetricWeight() int32

GetHardPodAffinitySymmetricWeight is not implemented yet.

func (*FakeConfigurator) GetNodeLister

func (fc *FakeConfigurator) GetNodeLister() corelisters.NodeLister

GetNodeLister is not implemented yet.

func (*FakeConfigurator) GetPredicateMetadataProducer

func (fc *FakeConfigurator) GetPredicateMetadataProducer() (algorithm.PredicateMetadataProducer, error)

GetPredicateMetadataProducer is not implemented yet.

func (*FakeConfigurator) GetPredicates

func (fc *FakeConfigurator) GetPredicates(predicateKeys sets.String) (map[string]algorithm.FitPredicate, error)

GetPredicates is not implemented yet.

func (*FakeConfigurator) GetScheduledPodLister

func (fc *FakeConfigurator) GetScheduledPodLister() corelisters.PodLister

GetScheduledPodLister is not implemented yet.

func (*FakeConfigurator) MakeDefaultErrorFunc

func (fc *FakeConfigurator) MakeDefaultErrorFunc(backoff *util.PodBackoff, podQueue core.SchedulingQueue) func(pod *v1.Pod, err error)

MakeDefaultErrorFunc is not implemented yet.

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 PodPreemptor

type PodPreemptor interface {
	GetUpdatedPod(pod *v1.Pod) (*v1.Pod, error)
	DeletePod(pod *v1.Pod) error
	SetNominatedNodeName(pod *v1.Pod, nominatedNode string) error
	RemoveNominatedNodeName(pod *v1.Pod) error
}

PodPreemptor has methods needed to delete a pod and to update annotations of the preemptor pod.

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 NewFromConfig

func NewFromConfig(config *Config) *Scheduler

NewFromConfig returns a new scheduler using the provided Config.

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) Cache

func (sched *Scheduler) Cache() schedulercache.Cache

Cache returns the cache in scheduler for test to check the data in scheduler.

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 waits for cache to be synced, then 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.