scheduler

Documentation

Index

• Constants
• Variables
• func EqualPriority(_ *api.Pod, nodeNameToInfo map[string]*schedulercache.NodeInfo, ...) (schedulerapi.HostPriorityList, error)
• func NewGenericScheduler(cache schedulercache.Cache, predicates map[string]algorithm.FitPredicate, ...) algorithm.ScheduleAlgorithm
• func NewHTTPExtender(config *schedulerapi.ExtenderConfig, apiVersion string) (algorithm.SchedulerExtender, error)
• func PrioritizeNodes(pod *api.Pod, nodeNameToInfo map[string]*schedulercache.NodeInfo, ...) (schedulerapi.HostPriorityList, error)
• type Binder
• type Config
• type FailedPredicateMap
• type FitError
  • func (f *FitError) Error() string
• type HTTPExtender
  • func (h *HTTPExtender) Filter(pod *api.Pod, nodes []*api.Node) ([]*api.Node, schedulerapi.FailedNodesMap, error)
  • func (h *HTTPExtender) Prioritize(pod *api.Pod, nodes []*api.Node) (*schedulerapi.HostPriorityList, int, error)
• type PodConditionUpdater
• type Scheduler
  • func New(c *Config) *Scheduler
  • func (s *Scheduler) Run()

Constants

const (
	DefaultExtenderTimeout = 5 * time.Second
)

Variables

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

Functions

func EqualPriority

func EqualPriority(_ *api.Pod, nodeNameToInfo map[string]*schedulercache.NodeInfo, nodes []*api.Node) (schedulerapi.HostPriorityList, error)

EqualPriority is a prioritizer function that gives an equal weight of one to all nodes

func NewGenericScheduler

func NewGenericScheduler(cache schedulercache.Cache, predicates map[string]algorithm.FitPredicate, prioritizers []algorithm.PriorityConfig, extenders []algorithm.SchedulerExtender) algorithm.ScheduleAlgorithm

func NewHTTPExtender

func NewHTTPExtender(config *schedulerapi.ExtenderConfig, apiVersion string) (algorithm.SchedulerExtender, error)

func PrioritizeNodes

func PrioritizeNodes(
	pod *api.Pod,
	nodeNameToInfo map[string]*schedulercache.NodeInfo,
	priorityConfigs []algorithm.PriorityConfig,
	nodes []*api.Node,
	extenders []algorithm.SchedulerExtender,
) (schedulerapi.HostPriorityList, error)

Prioritizes the nodes by running the individual priority functions in parallel. Each priority function is expected to set a score of 0-10 0 is the lowest priority score (least preferred node) and 10 is the highest Each priority function can also have its own weight The node scores returned by the priority function are multiplied by the weights to get weighted scores All scores are finally combined (added) to get the total weighted scores of all nodes

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 SchedulerCache will be observed
	// by NodeLister and Algorithm.
	SchedulerCache schedulercache.Cache
	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() *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

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

type FailedPredicateMap

type FailedPredicateMap map[string][]algorithm.PredicateFailureReason

type FitError

type FitError struct {
	Pod              *api.Pod
	FailedPredicates FailedPredicateMap
}

func (*FitError) Error

func (f *FitError) Error() string

Error returns detailed information of why the pod failed to fit on each node

type HTTPExtender

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

HTTPExtender implements the algorithm.SchedulerExtender interface.

func (*HTTPExtender) Filter

func (h *HTTPExtender) Filter(pod *api.Pod, nodes []*api.Node) ([]*api.Node, schedulerapi.FailedNodesMap, error)

Filter based on extender implemented predicate functions. The filtered list is expected to be a subset of the supplied list. failedNodesMap optionally contains the list of failed nodes and failure reasons.

func (*HTTPExtender) Prioritize

func (h *HTTPExtender) Prioritize(pod *api.Pod, nodes []*api.Node) (*schedulerapi.HostPriorityList, int, 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.

type PodConditionUpdater

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

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.

func (*Scheduler) Run

func (s *Scheduler) Run()

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