Documentation
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Index ¶
- func NominatedNodeName(pod *v1.Pod) string
- type FIFO
- func (f *FIFO) Add(pod *v1.Pod) error
- func (f *FIFO) AddIfNotPresent(pod *v1.Pod) error
- func (f *FIFO) AddUnschedulableIfNotPresent(pod *v1.Pod, podSchedulingCycle int64) error
- func (f *FIFO) AssignedPodAdded(pod *v1.Pod)
- func (f *FIFO) AssignedPodUpdated(pod *v1.Pod)
- func (f *FIFO) Close()
- func (f *FIFO) Delete(pod *v1.Pod) error
- func (f *FIFO) DeleteNominatedPodIfExists(pod *v1.Pod)
- func (f *FIFO) MoveAllToActiveQueue()
- func (f *FIFO) NominatedPodsForNode(nodeName string) []*v1.Pod
- func (f *FIFO) NumUnschedulablePods() int
- func (f *FIFO) Pop() (*v1.Pod, error)
- func (f *FIFO) SchedulingCycle() int64
- func (f *FIFO) Update(oldPod, newPod *v1.Pod) error
- func (f *FIFO) UpdateNominatedPodForNode(pod *v1.Pod, nodeName string)
- func (f *FIFO) WaitingPods() []*v1.Pod
- type Heap
- func (h *Heap) Add(obj interface{}) error
- func (h *Heap) AddIfNotPresent(obj interface{}) error
- func (h *Heap) Delete(obj interface{}) error
- func (h *Heap) Get(obj interface{}) (interface{}, bool, error)
- func (h *Heap) GetByKey(key string) (interface{}, bool, error)
- func (h *Heap) List() []interface{}
- func (h *Heap) Pop() (interface{}, error)
- func (h *Heap) Update(obj interface{}) error
- type KeyFunc
- type LessFunc
- type PriorityQueue
- func (p *PriorityQueue) Add(pod *v1.Pod) error
- func (p *PriorityQueue) AddIfNotPresent(pod *v1.Pod) error
- func (p *PriorityQueue) AddUnschedulableIfNotPresent(pod *v1.Pod, podSchedulingCycle int64) error
- func (p *PriorityQueue) AssignedPodAdded(pod *v1.Pod)
- func (p *PriorityQueue) AssignedPodUpdated(pod *v1.Pod)
- func (p *PriorityQueue) Close()
- func (p *PriorityQueue) Delete(pod *v1.Pod) error
- func (p *PriorityQueue) DeleteNominatedPodIfExists(pod *v1.Pod)
- func (p *PriorityQueue) MoveAllToActiveQueue()
- func (p *PriorityQueue) NominatedPodsForNode(nodeName string) []*v1.Pod
- func (p *PriorityQueue) NumUnschedulablePods() int
- func (p *PriorityQueue) Pop() (*v1.Pod, error)
- func (p *PriorityQueue) SchedulingCycle() int64
- func (p *PriorityQueue) Update(oldPod, newPod *v1.Pod) error
- func (p *PriorityQueue) UpdateNominatedPodForNode(pod *v1.Pod, nodeName string)
- func (p *PriorityQueue) WaitingPods() []*v1.Pod
- type SchedulingQueue
- type UnschedulablePodsMap
Constants ¶
This section is empty.
Variables ¶
This section is empty.
Functions ¶
func NominatedNodeName ¶
NominatedNodeName returns nominated node name of a Pod.
Types ¶
type FIFO ¶
FIFO is basically a simple wrapper around cache.FIFO to make it compatible with the SchedulingQueue interface.
func (*FIFO) AddIfNotPresent ¶
AddIfNotPresent adds a pod to the FIFO if it is absent in the FIFO.
func (*FIFO) AddUnschedulableIfNotPresent ¶
AddUnschedulableIfNotPresent adds an unschedulable pod back to the queue. In FIFO it is added to the end of the queue.
func (*FIFO) AssignedPodAdded ¶
AssignedPodAdded does nothing here.
func (*FIFO) AssignedPodUpdated ¶
AssignedPodUpdated does nothing here.
func (*FIFO) DeleteNominatedPodIfExists ¶
DeleteNominatedPodIfExists does nothing in FIFO.
func (*FIFO) MoveAllToActiveQueue ¶
func (f *FIFO) MoveAllToActiveQueue()
MoveAllToActiveQueue does nothing in FIFO as all pods are always in the active queue.
func (*FIFO) NominatedPodsForNode ¶ added in v1.13.3
NominatedPodsForNode returns pods that are nominated to run on the given node, but FIFO does not support it.
func (*FIFO) NumUnschedulablePods ¶
NumUnschedulablePods returns the number of unschedulable pods exist in the SchedulingQueue.
func (*FIFO) Pop ¶
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) SchedulingCycle ¶ added in v1.13.6
SchedulingCycle implements SchedulingQueue.SchedulingCycle interface.
func (*FIFO) UpdateNominatedPodForNode ¶ added in v1.13.3
UpdateNominatedPodForNode does nothing in FIFO.
func (*FIFO) WaitingPods ¶
WaitingPods returns all the waiting pods in the queue.
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 ¶
Add inserts an item, and puts it in the queue. The item is updated if it already exists.
func (*Heap) AddIfNotPresent ¶
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.
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(stop <-chan struct{}) *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, podSchedulingCycle int64) error
AddUnschedulableIfNotPresent does nothing if the pod is present in any queue. If pod is unschedulable, it adds pod to unschedulable queue if p.moveRequestCycle > podSchedulingCycle or to backoff queue if p.moveRequestCycle <= podSchedulingCycle but pod is subject to backoff. In other cases, it adds pod to active queue.
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) DeleteNominatedPodIfExists ¶
func (p *PriorityQueue) DeleteNominatedPodIfExists(pod *v1.Pod)
DeleteNominatedPodIfExists deletes pod nominatedPods.
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) NominatedPodsForNode ¶ added in v1.13.3
func (p *PriorityQueue) NominatedPodsForNode(nodeName string) []*v1.Pod
NominatedPodsForNode 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.
func (*PriorityQueue) NumUnschedulablePods ¶
func (p *PriorityQueue) NumUnschedulablePods() int
NumUnschedulablePods returns the number of unschedulable pods exist in the SchedulingQueue.
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 increments scheduling cycle when a pod is popped.
func (*PriorityQueue) SchedulingCycle ¶ added in v1.13.6
func (p *PriorityQueue) SchedulingCycle() int64
SchedulingCycle returns current 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) UpdateNominatedPodForNode ¶ added in v1.13.3
func (p *PriorityQueue) UpdateNominatedPodForNode(pod *v1.Pod, nodeName string)
UpdateNominatedPodForNode adds a pod to the nominated pods of the given node. This is called during the preemption process after a node is nominated to run the pod. We update the structure before sending a request to update the pod object to avoid races with the following scheduling cycles.
func (*PriorityQueue) WaitingPods ¶
func (p *PriorityQueue) WaitingPods() []*v1.Pod
WaitingPods returns all the waiting pods in the queue.
type SchedulingQueue ¶
type SchedulingQueue interface { Add(pod *v1.Pod) error AddIfNotPresent(pod *v1.Pod) error // AddUnschedulableIfNotPresent adds an unschedulable pod back to scheduling queue. // The podSchedulingCycle represents the current scheduling cycle number which can be // returned by calling SchedulingCycle(). AddUnschedulableIfNotPresent(pod *v1.Pod, podSchedulingCycle int64) error // SchedulingCycle returns the current number of scheduling cycle which is // cached by scheduling queue. Normally, incrementing this number whenever // a pod is popped (e.g. called Pop()) is enough. SchedulingCycle() int64 // Pop removes the head of the queue and returns it. It blocks if the // queue is empty and waits until a new item is added to the queue. Pop() (*v1.Pod, error) Update(oldPod, newPod *v1.Pod) error Delete(pod *v1.Pod) error MoveAllToActiveQueue() AssignedPodAdded(pod *v1.Pod) AssignedPodUpdated(pod *v1.Pod) NominatedPodsForNode(nodeName string) []*v1.Pod WaitingPods() []*v1.Pod // Close closes the SchedulingQueue so that the goroutine which is // waiting to pop items can exit gracefully. Close() // UpdateNominatedPodForNode adds the given pod to the nominated pod map or // updates it if it already exists. UpdateNominatedPodForNode(pod *v1.Pod, nodeName string) // DeleteNominatedPodIfExists deletes nominatedPod from internal cache DeleteNominatedPodIfExists(pod *v1.Pod) // NumUnschedulablePods returns the number of unschedulable pods exist in the SchedulingQueue. NumUnschedulablePods() int }
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(stop <-chan struct{}) 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.