schedulercache

package
v1.7.0-alpha.0 Latest Latest
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 Go to latest Published: Feb 21, 2017 License: Apache-2.0 Imports: 12 Imported by: 0

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Constants

This section is empty.

Variables

This section is empty.

Functions

func CreateNodeNameToInfoMap 

func CreateNodeNameToInfoMap(pods []*v1.Pod, nodes []*v1.Node) map[string]*NodeInfo

CreateNodeNameToInfoMap obtains a list of pods and pivots that list into a map where the keys are node names and the values are the aggregated information for that node.

func ReconcileAffinity 

func ReconcileAffinity(pod *v1.Pod) *v1.Affinity

Reconcile api and annotation affinity definitions. When alpha affinity feature is not enabled, always take affinity from PodSpec.When alpha affinity feature is enabled, if affinity is not set in PodSpec, take affinity from annotation. When alpha affinity feature is enabled, if affinity is set in PodSpec, take node affinity, pod affinity, and pod anti-affinity individually using the following rule: take affinity from PodSpec if it is defined, otherwise take from annotation if it is defined. TODO: remove when alpha support for affinity is removed

Types

type Cache 

type Cache interface {
	// AssumePod assumes a pod scheduled and aggregates the pod's information into its node.
	// The implementation also decides the policy to expire pod before being confirmed (receiving Add event).
	// After expiration, its information would be subtracted.
	AssumePod(pod *v1.Pod) error

	// FinishBinding signals that cache for assumed pod can be expired
	FinishBinding(pod *v1.Pod) error

	// ForgetPod removes an assumed pod from cache.
	ForgetPod(pod *v1.Pod) error

	// AddPod either confirms a pod if it's assumed, or adds it back if it's expired.
	// If added back, the pod's information would be added again.
	AddPod(pod *v1.Pod) error

	// UpdatePod removes oldPod's information and adds newPod's information.
	UpdatePod(oldPod, newPod *v1.Pod) error

	// RemovePod removes a pod. The pod's information would be subtracted from assigned node.
	RemovePod(pod *v1.Pod) error

	// AddNode adds overall information about node.
	AddNode(node *v1.Node) error

	// UpdateNode updates overall information about node.
	UpdateNode(oldNode, newNode *v1.Node) error

	// RemoveNode removes overall information about node.
	RemoveNode(node *v1.Node) error

	// UpdateNodeNameToInfoMap updates the passed infoMap to the current contents of Cache.
	// The node info contains aggregated information of pods scheduled (including assumed to be)
	// on this node.
	UpdateNodeNameToInfoMap(infoMap map[string]*NodeInfo) error

	// List lists all cached pods (including assumed ones).
	List(labels.Selector) ([]*v1.Pod, error)
}

Cache collects pods' information and provides node-level aggregated information. It's intended for generic scheduler to do efficient lookup. Cache's operations are pod centric. It does incremental updates based on pod events. Pod events are sent via network. We don't have guaranteed delivery of all events: We use Reflector to list and watch from remote. Reflector might be slow and do a relist, which would lead to missing events.

State Machine of a pod's events in scheduler's cache: 

+-------------------------------------------+  +----+
|                            Add            |  |    |
|                                           |  |    | Update
+      Assume                Add            v  v    |

Initial +--------> Assumed +------------+---> Added <--+ 

^                +   +               |       +
|                |   |               |       |
|                |   |           Add |       | Remove
|                |   |               |       |
|                |   |               +       |
+----------------+   +-----------> Expired   +----> Deleted
      Forget             Expire

Note that an assumed pod can expire, because if we haven't received Add event notifying us for a while, there might be some problems and we shouldn't keep the pod in cache anymore.

Note that "Initial", "Expired", and "Deleted" pods do not actually exist in cache. Based on existing use cases, we are making the following assumptions:

  • No pod would be assumed twice
  • A pod could be added without going through scheduler. In this case, we will see Add but not Assume event.
  • If a pod wasn't added, it wouldn't be removed or updated.
  • Both "Expired" and "Deleted" are valid end states. In case of some problems, e.g. network issue, a pod might have changed its state (e.g. added and deleted) without delivering notification to the cache.

func New 

func New(ttl time.Duration, stop <-chan struct{}) Cache

New returns a Cache implementation. It automatically starts a go routine that manages expiration of assumed pods. "ttl" is how long the assumed pod will get expired. "stop" is the channel that would close the background goroutine.

type NodeInfo 

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

NodeInfo is node level aggregated information.

func NewNodeInfo 

func NewNodeInfo(pods ...*v1.Pod) *NodeInfo

NewNodeInfo returns a ready to use empty NodeInfo object. If any pods are given in arguments, their information will be aggregated in the returned object.

func (*NodeInfo) AllocatableResource added in v1.4.0 

func (n *NodeInfo) AllocatableResource() Resource

AllocatableResource returns allocatable resources on a given node.

func (*NodeInfo) AllowedPodNumber added in v1.4.0 

func (n *NodeInfo) AllowedPodNumber() int

func (*NodeInfo) Clone 

func (n *NodeInfo) Clone() *NodeInfo

func (*NodeInfo) DiskPressureCondition 

func (n *NodeInfo) DiskPressureCondition() v1.ConditionStatus

func (*NodeInfo) MemoryPressureCondition 

func (n *NodeInfo) MemoryPressureCondition() v1.ConditionStatus

func (*NodeInfo) Node added in v1.3.0 

func (n *NodeInfo) Node() *v1.Node

Returns overall information about this node.

func (*NodeInfo) NonZeroRequest 

func (n *NodeInfo) NonZeroRequest() Resource

NonZeroRequest returns aggregated nonzero resource request of pods on this node.

func (*NodeInfo) Pods 

func (n *NodeInfo) Pods() []*v1.Pod

Pods return all pods scheduled (including assumed to be) on this node.

func (*NodeInfo) PodsWithAffinity added in v1.4.0 

func (n *NodeInfo) PodsWithAffinity() []*v1.Pod

PodsWithAffinity return all pods with (anti)affinity constraints on this node.

func (*NodeInfo) RemoveNode added in v1.3.0 

func (n *NodeInfo) RemoveNode(node *v1.Node) error

Removes the overall information about the node.

func (*NodeInfo) RequestedResource 

func (n *NodeInfo) RequestedResource() Resource

RequestedResource returns aggregated resource request of pods on this node.

func (*NodeInfo) SetNode added in v1.3.0 

func (n *NodeInfo) SetNode(node *v1.Node) error

Sets the overall node information.

func (*NodeInfo) String 

func (n *NodeInfo) String() string

String returns representation of human readable format of this NodeInfo.

func (*NodeInfo) Taints 

func (n *NodeInfo) Taints() ([]v1.Taint, error)

type Resource 

type Resource struct {
	MilliCPU           int64
	Memory             int64
	NvidiaGPU          int64
	OpaqueIntResources map[v1.ResourceName]int64
}

Resource is a collection of compute resource.

func (*Resource) AddOpaque 

func (r *Resource) AddOpaque(name v1.ResourceName, quantity int64)

func (*Resource) ResourceList added in v1.5.0 

func (r *Resource) ResourceList() v1.ResourceList

Source Files

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