scheduler

package
Version: v0.4.3 Latest Latest
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Published: Apr 8, 2015 License: Apache-2.0 Imports: 10 Imported by: 0

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Constants

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Functions

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Types

type Binder

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

Binder knows how to write a binding.

type Config

type Config struct {
	// It is expected that changes made via modeler will be observed
	// by MinionLister and Algorithm.
	Modeler      SystemModeler
	MinionLister scheduler.MinionLister
	Algorithm    scheduler.Scheduler
	Binder       Binder

	// 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() *api.Pod

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

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

type ExtendedPodLister added in v0.4.2

type ExtendedPodLister interface {
	algorithm.PodLister
	Exists(pod *api.Pod) (bool, error)
}

ExtendedPodLister: SimpleModeler needs to be able to check for a pod's existance in addition to listing the pods.

type FakeModeler added in v0.4.2

type FakeModeler struct {
	AssumePodFunc func(pod *api.Pod)
	ForgetPodFunc func(pod *api.Pod)
	// contains filtered or unexported fields
}

FakeModeler implements the SystemModeler interface.

func (*FakeModeler) AssumePod added in v0.4.2

func (f *FakeModeler) AssumePod(pod *api.Pod)

AssumePod calls the function variable if it is not nil.

func (*FakeModeler) ForgetPod added in v0.4.3

func (f *FakeModeler) ForgetPod(pod *api.Pod)

ForgetPod calls the function variable if it is not nil.

func (*FakeModeler) LockedAction added in v0.4.3

func (a *FakeModeler) LockedAction(do func())

LockedAction serializes calls of whatever is passed as 'do'.

type Scheduler

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

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

func New

func New(c *Config) *Scheduler

New returns a new scheduler.

func (*Scheduler) Run

func (s *Scheduler) Run()

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

type SimpleModeler added in v0.4.2

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

SimpleModeler implements the SystemModeler interface with a timed pod cache.

func NewSimpleModeler added in v0.4.2

func NewSimpleModeler(queuedPods, scheduledPods ExtendedPodLister) *SimpleModeler

NewSimpleModeler returns a new SimpleModeler.

queuedPods: a PodLister that will return pods that have not been scheduled yet.
scheduledPods: a PodLister that will return pods that we know for sure have been scheduled.

func (*SimpleModeler) AssumePod added in v0.4.2

func (s *SimpleModeler) AssumePod(pod *api.Pod)

func (*SimpleModeler) ForgetPod added in v0.4.3

func (s *SimpleModeler) ForgetPod(pod *api.Pod)

func (*SimpleModeler) LockedAction added in v0.4.3

func (a *SimpleModeler) LockedAction(do func())

LockedAction serializes calls of whatever is passed as 'do'.

func (*SimpleModeler) PodLister added in v0.4.2

func (s *SimpleModeler) PodLister() algorithm.PodLister

PodLister returns a PodLister that will list pods that we think we have scheduled in addition to pods that we know have been scheduled.

type SystemModeler added in v0.4.2

type SystemModeler interface {
	// AssumePod assumes that the given pod exists in the system.
	// The assumtion should last until the system confirms the
	// assumtion or disconfirms it.
	AssumePod(pod *api.Pod)
	// ForgetPod removes a pod assumtion. (It won't make the model
	// show the absence of the given pod if the pod is in the scheduled
	// pods list!)
	ForgetPod(pod *api.Pod)

	// For serializing calls to Assume/ForgetPod: imagine you want to add
	// a pod iff a bind succeeds, but also remove a pod if it is deleted.
	// TODO: if SystemModeler begins modeling things other than pods, this
	// should probably be parameterized or specialized for pods.
	LockedAction(f func())
}

SystemModeler can help scheduler produce a model of the system that anticipates reality. For example, if scheduler has pods A and B both using hostPort 80, when it binds A to machine M it should not bind B to machine M in the time when it hasn't observed the binding of A take effect yet.

Since the model is only an optimization, it's expected to handle any errors itself without sending them back to the scheduler.

Directories

Path Synopsis
This package is used to register algorithm provider plugins.
This package is used to register algorithm provider plugins.
defaults
This is the default algorithm provider for the scheduler.
This is the default algorithm provider for the scheduler.
api
v1
Package factory can set up a scheduler.
Package factory can set up a scheduler.

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