core

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 Go to latest Published: Sep 23, 2020 License: Apache-2.0 Imports: 36 Imported by: 0

Documentation

Index

Constants

View Source 
const (
	// DefaultExtenderTimeout defines the default extender timeout in second.
	DefaultExtenderTimeout = 5 * time.Second
)
View Source 
const (
	// NoNodeAvailableMsg is used to format message when no nodes available.
	NoNodeAvailableMsg = "0/%v nodes are available"
)

Variables

View Source 
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 EqualPriorityMap 

func EqualPriorityMap(_ *v1.Pod, _ interface{}, nodeInfo *schedulercache.NodeInfo) (schedulerapi.HostPriority, error)

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

func NewGenericScheduler 

func NewGenericScheduler(
	cache schedulercache.Cache,
	eCache *equivalence.Cache,
	podQueue SchedulingQueue,
	predicates map[string]algorithm.FitPredicate,
	predicateMetaProducer algorithm.PredicateMetadataProducer,
	prioritizers []algorithm.PriorityConfig,
	priorityMetaProducer algorithm.PriorityMetadataProducer,
	extenders []algorithm.SchedulerExtender,
	volumeBinder *volumebinder.VolumeBinder,
	pvcLister corelisters.PersistentVolumeClaimLister,
	alwaysCheckAllPredicates bool,
	disablePreemption bool,
	percentageOfNodesToScore int32,
) algorithm.ScheduleAlgorithm

NewGenericScheduler creates a genericScheduler object.

func NewHTTPExtender 

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

NewHTTPExtender creates an HTTPExtender object.

func NominatedNodeName 

func NominatedNodeName(pod *v1.Pod) string

NominatedNodeName returns nominated node name of a Pod.

func PrioritizeNodes 

func PrioritizeNodes(
	pod *v1.Pod,
	nodeNameToInfo map[string]*schedulercache.NodeInfo,
	meta interface{},
	priorityConfigs []algorithm.PriorityConfig,
	nodes []*v1.Node,
	extenders []algorithm.SchedulerExtender,
) (schedulerapi.HostPriorityList, error)

PrioritizeNodes 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 FIFO 

type FIFO struct {
	*cache.FIFO
}

FIFO is basically a simple wrapper around cache.FIFO to make it compatible with the SchedulingQueue interface.

func NewFIFO 

func NewFIFO() *FIFO

NewFIFO creates a FIFO object.

func (*FIFO) Add 

func (f *FIFO) Add(pod *v1.Pod) error

Add adds a pod to the FIFO.

func (*FIFO) AddIfNotPresent 

func (f *FIFO) AddIfNotPresent(pod *v1.Pod) error

AddIfNotPresent adds a pod to the FIFO if it is absent in the FIFO.

func (*FIFO) AddUnschedulableIfNotPresent 

func (f *FIFO) AddUnschedulableIfNotPresent(pod *v1.Pod) error

AddUnschedulableIfNotPresent adds an unschedulable pod back to the queue. In FIFO it is added to the end of the queue.

func (*FIFO) AssignedPodAdded 

func (f *FIFO) AssignedPodAdded(pod *v1.Pod)

AssignedPodAdded does nothing here.

func (*FIFO) AssignedPodUpdated 

func (f *FIFO) AssignedPodUpdated(pod *v1.Pod)

AssignedPodUpdated does nothing here.

func (*FIFO) Delete 

func (f *FIFO) Delete(pod *v1.Pod) error

Delete deletes a pod in the FIFO.

func (*FIFO) MoveAllToActiveQueue 

func (f *FIFO) MoveAllToActiveQueue()

MoveAllToActiveQueue does nothing in FIFO as all pods are always in the active queue.

func (*FIFO) Pop 

func (f *FIFO) Pop() (*v1.Pod, error)

Pop removes the head of FIFO and returns it. This is just a copy/paste of cache.Pop(queue Queue) from fifo.go that scheduler has always been using. There is a comment in that file saying that this method shouldn't be used in production code, but scheduler has always been using it. This function does minimal error checking.

func (*FIFO) Update 

func (f *FIFO) Update(oldPod, newPod *v1.Pod) error

Update updates a pod in the FIFO.

func (*FIFO) WaitingPods 

func (f *FIFO) WaitingPods() []*v1.Pod

WaitingPods returns all the waiting pods in the queue.

func (*FIFO) WaitingPodsForNode 

func (f *FIFO) WaitingPodsForNode(nodeName string) []*v1.Pod

WaitingPodsForNode returns pods that are nominated to run on the given node, but FIFO does not support it.

type FailedPredicateMap 

type FailedPredicateMap map[string][]algorithm.PredicateFailureReason

FailedPredicateMap declares a map[string][]algorithm.PredicateFailureReason type.

type FitError 

type FitError struct {
	Pod              *v1.Pod
	NumAllNodes      int
	FailedPredicates FailedPredicateMap
}

FitError describes a fit error of a pod.

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) 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, nodeNameToInfo map[string]*schedulercache.NodeInfo,
) ([]*v1.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) 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) Prioritize 

func (h *HTTPExtender) Prioritize(pod *v1.Pod, nodes []*v1.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.

func (*HTTPExtender) ProcessPreemption 

func (h *HTTPExtender) ProcessPreemption(
	pod *v1.Pod,
	nodeToVictims map[*v1.Node]*schedulerapi.Victims,
	nodeNameToInfo map[string]*schedulercache.NodeInfo,
) (map[*v1.Node]*schedulerapi.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 if a extender support preemption. A extender should have preempt verb defined and enabled its own node cache.

type Heap 

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

Heap is a producer/consumer queue that implements a heap data structure. It can be used to implement priority queues and similar data structures.

func (*Heap) Add 

func (h *Heap) Add(obj interface{}) error

Add inserts an item, and puts it in the queue. The item is updated if it already exists.

func (*Heap) AddIfNotPresent 

func (h *Heap) AddIfNotPresent(obj interface{}) error

AddIfNotPresent inserts an item, and puts it in the queue. If an item with the key is present in the map, no changes is made to the item.

func (*Heap) Delete 

func (h *Heap) Delete(obj interface{}) error

Delete removes an item.

func (*Heap) Get 

func (h *Heap) Get(obj interface{}) (interface{}, bool, error)

Get returns the requested item, or sets exists=false.

func (*Heap) GetByKey 

func (h *Heap) GetByKey(key string) (interface{}, bool, error)

GetByKey returns the requested item, or sets exists=false.

func (*Heap) List 

func (h *Heap) List() []interface{}

List returns a list of all the items.

func (*Heap) Pop 

func (h *Heap) Pop() (interface{}, error)

Pop returns the head of the heap.

func (*Heap) Update 

func (h *Heap) Update(obj interface{}) error

Update is the same as Add in this implementation. When the item does not exist, it is added.

type KeyFunc 

type KeyFunc func(obj interface{}) (string, error)

KeyFunc is a function type to get the key from an object.

type LessFunc 

type LessFunc func(interface{}, interface{}) bool

LessFunc is a function type to compare two objects.

type PriorityQueue 

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

PriorityQueue implements a scheduling queue. It is an alternative to FIFO. The head of PriorityQueue is the highest priority pending pod. This structure has two sub queues. One sub-queue holds pods that are being considered for scheduling. This is called activeQ and is a Heap. Another queue holds pods that are already tried and are determined to be unschedulable. The latter is called unschedulableQ.

func NewPriorityQueue 

func NewPriorityQueue() *PriorityQueue

NewPriorityQueue creates a PriorityQueue object.

func (*PriorityQueue) Add 

func (p *PriorityQueue) Add(pod *v1.Pod) error

Add adds a pod to the active queue. It should be called only when a new pod is added so there is no chance the pod is already in either queue.

func (*PriorityQueue) AddIfNotPresent 

func (p *PriorityQueue) AddIfNotPresent(pod *v1.Pod) error

AddIfNotPresent adds a pod to the active queue if it is not present in any of the two queues. If it is present in any, it doesn't do any thing.

func (*PriorityQueue) AddUnschedulableIfNotPresent 

func (p *PriorityQueue) AddUnschedulableIfNotPresent(pod *v1.Pod) error

AddUnschedulableIfNotPresent does nothing if the pod is present in either queue. Otherwise it adds the pod to the unschedulable queue if p.receivedMoveRequest is false, and to the activeQ if p.receivedMoveRequest is true.

func (*PriorityQueue) AssignedPodAdded 

func (p *PriorityQueue) AssignedPodAdded(pod *v1.Pod)

AssignedPodAdded is called when a bound pod is added. Creation of this pod may make pending pods with matching affinity terms schedulable.

func (*PriorityQueue) AssignedPodUpdated 

func (p *PriorityQueue) AssignedPodUpdated(pod *v1.Pod)

AssignedPodUpdated is called when a bound pod is updated. Change of labels may make pending pods with matching affinity terms schedulable.

func (*PriorityQueue) Delete 

func (p *PriorityQueue) Delete(pod *v1.Pod) error

Delete deletes the item from either of the two queues. It assumes the pod is only in one queue.

func (*PriorityQueue) MoveAllToActiveQueue 

func (p *PriorityQueue) MoveAllToActiveQueue()

MoveAllToActiveQueue moves all pods from unschedulableQ to activeQ. This function adds all pods and then signals the condition variable to ensure that if Pop() is waiting for an item, it receives it after all the pods are in the queue and the head is the highest priority pod. TODO(bsalamat): We should add a back-off mechanism here so that a high priority pod which is unschedulable does not go to the head of the queue frequently. For example in a cluster where a lot of pods being deleted, such a high priority pod can deprive other pods from getting scheduled.

func (*PriorityQueue) Pop 

func (p *PriorityQueue) Pop() (*v1.Pod, error)

Pop removes the head of the active queue and returns it. It blocks if the activeQ is empty and waits until a new item is added to the queue. It also clears receivedMoveRequest to mark the beginning of a new scheduling cycle.

func (*PriorityQueue) Update 

func (p *PriorityQueue) Update(oldPod, newPod *v1.Pod) error

Update updates a pod in the active queue if present. Otherwise, it removes the item from the unschedulable queue and adds the updated one to the active queue.

func (*PriorityQueue) WaitingPods 

func (p *PriorityQueue) WaitingPods() []*v1.Pod

WaitingPods returns all the waiting pods in the queue.

func (*PriorityQueue) WaitingPodsForNode 

func (p *PriorityQueue) WaitingPodsForNode(nodeName string) []*v1.Pod

WaitingPodsForNode returns pods that are nominated to run on the given node, but they are waiting for other pods to be removed from the node before they can be actually scheduled.

type SchedulingQueue 

type SchedulingQueue interface {
	Add(pod *v1.Pod) error
	AddIfNotPresent(pod *v1.Pod) error
	AddUnschedulableIfNotPresent(pod *v1.Pod) error
	Pop() (*v1.Pod, error)
	Update(oldPod, newPod *v1.Pod) error
	Delete(pod *v1.Pod) error
	MoveAllToActiveQueue()
	AssignedPodAdded(pod *v1.Pod)
	AssignedPodUpdated(pod *v1.Pod)
	WaitingPodsForNode(nodeName string) []*v1.Pod
	WaitingPods() []*v1.Pod
}

SchedulingQueue is an interface for a queue to store pods waiting to be scheduled. The interface follows a pattern similar to cache.FIFO and cache.Heap and makes it easy to use those data structures as a SchedulingQueue.

func NewSchedulingQueue 

func NewSchedulingQueue() SchedulingQueue

NewSchedulingQueue initializes a new scheduling queue. If pod priority is enabled a priority queue is returned. If it is disabled, a FIFO is returned.

type UnschedulablePodsMap 

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

UnschedulablePodsMap holds pods that cannot be scheduled. This data structure is used to implement unschedulableQ.

Source Files

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Directories

Path Synopsis
Package equivalence defines Pod equivalence classes and the equivalence class cache.
 Package equivalence defines Pod equivalence classes and the equivalence class cache.

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