kubernetes: k8s.io/kubernetes/pkg/scheduler/cache Index | Files

package cache

import "k8s.io/kubernetes/pkg/scheduler/cache"


Package Files

cache.go interface.go node_info.go util.go

func CreateNodeNameToInfoMap Uses

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.

type Cache Uses

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

    // GetPod returns the pod from the cache with the same namespace and the
    // same name of the specified pod.
    GetPod(pod *v1.Pod) (*v1.Pod, error)

    // IsAssumedPod returns true if the pod is assumed and not expired.
    IsAssumedPod(pod *v1.Pod) (bool, 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

    // AddPDB adds a PodDisruptionBudget object to the cache.
    AddPDB(pdb *policy.PodDisruptionBudget) error

    // UpdatePDB updates a PodDisruptionBudget object in the cache.
    UpdatePDB(oldPDB, newPDB *policy.PodDisruptionBudget) error

    // RemovePDB removes a PodDisruptionBudget object from the cache.
    RemovePDB(pdb *policy.PodDisruptionBudget) error

    // List lists all cached PDBs matching the selector.
    ListPDBs(selector labels.Selector) ([]*policy.PodDisruptionBudget, 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)

    // FilteredList returns all cached pods that pass the filter.
    FilteredList(filter PodFilter, selector labels.Selector) ([]*v1.Pod, error)

    // Snapshot takes a snapshot on current cache
    Snapshot() *Snapshot

    // IsUpToDate returns true if the given NodeInfo matches the current data in the cache.
    IsUpToDate(n *NodeInfo) bool

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 Uses

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 ImageStateSummary Uses

type ImageStateSummary struct {
    // Size of the image
    Size int64
    // Used to track how many nodes have this image
    NumNodes int

ImageStateSummary provides summarized information about the state of an image.

type NodeInfo Uses

type NodeInfo struct {

    // TransientInfo holds the information pertaining to a scheduling cycle. This will be destructed at the end of
    // scheduling cycle.
    // TODO: @ravig. Remove this once we have a clear approach for message passing across predicates and priorities.
    TransientInfo *transientSchedulerInfo
    // contains filtered or unexported fields

NodeInfo is node level aggregated information.

func NewNodeInfo Uses

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) AddPod Uses

func (n *NodeInfo) AddPod(pod *v1.Pod)

AddPod adds pod information to this NodeInfo.

func (*NodeInfo) AllocatableResource Uses

func (n *NodeInfo) AllocatableResource() Resource

AllocatableResource returns allocatable resources on a given node.

func (*NodeInfo) AllowedPodNumber Uses

func (n *NodeInfo) AllowedPodNumber() int

AllowedPodNumber returns the number of the allowed pods on this node.

func (*NodeInfo) Clone Uses

func (n *NodeInfo) Clone() *NodeInfo

Clone returns a copy of this node.

func (*NodeInfo) DiskPressureCondition Uses

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

DiskPressureCondition returns the disk pressure condition status on this node.

func (*NodeInfo) Filter Uses

func (n *NodeInfo) Filter(pod *v1.Pod) bool

Filter implements PodFilter interface. It returns false only if the pod node name matches NodeInfo.node and the pod is not found in the pods list. Otherwise, returns true.

func (*NodeInfo) FilterOutPods Uses

func (n *NodeInfo) FilterOutPods(pods []*v1.Pod) []*v1.Pod

FilterOutPods receives a list of pods and filters out those whose node names are equal to the node of this NodeInfo, but are not found in the pods of this NodeInfo.

Preemption logic simulates removal of pods on a node by removing them from the corresponding NodeInfo. In order for the simulation to work, we call this method on the pods returned from SchedulerCache, so that predicate functions see only the pods that are not removed from the NodeInfo.

func (*NodeInfo) ImageStates Uses

func (n *NodeInfo) ImageStates() map[string]*ImageStateSummary

ImageStates returns the state information of all images.

func (*NodeInfo) MemoryPressureCondition Uses

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

MemoryPressureCondition returns the memory pressure condition status on this node.

func (*NodeInfo) Node Uses

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

Node returns overall information about this node.

func (*NodeInfo) NonZeroRequest Uses

func (n *NodeInfo) NonZeroRequest() Resource

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

func (*NodeInfo) PIDPressureCondition Uses

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

PIDPressureCondition returns the pid pressure condition status on this node.

func (*NodeInfo) Pods Uses

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

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

func (*NodeInfo) PodsWithAffinity Uses

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

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

func (*NodeInfo) RemoveNode Uses

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

RemoveNode removes the overall information about the node.

func (*NodeInfo) RemovePod Uses

func (n *NodeInfo) RemovePod(pod *v1.Pod) error

RemovePod subtracts pod information from this NodeInfo.

func (*NodeInfo) RequestedResource Uses

func (n *NodeInfo) RequestedResource() Resource

RequestedResource returns aggregated resource request of pods on this node.

func (*NodeInfo) SetAllocatableResource Uses

func (n *NodeInfo) SetAllocatableResource(allocatableResource *Resource)

SetAllocatableResource sets the allocatableResource information of given node.

func (*NodeInfo) SetNode Uses

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

SetNode sets the overall node information.

func (*NodeInfo) String Uses

func (n *NodeInfo) String() string

String returns representation of human readable format of this NodeInfo.

func (*NodeInfo) Taints Uses

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

Taints returns the taints list on this node.

func (*NodeInfo) UsedPorts Uses

func (n *NodeInfo) UsedPorts() util.HostPortInfo

UsedPorts returns used ports on this node.

func (*NodeInfo) VolumeLimits Uses

func (n *NodeInfo) VolumeLimits() map[v1.ResourceName]int64

VolumeLimits returns volume limits associated with the node

type PodFilter Uses

type PodFilter func(*v1.Pod) bool

PodFilter is a function to filter a pod. If pod passed return true else return false.

type Resource Uses

type Resource struct {
    MilliCPU         int64
    Memory           int64
    EphemeralStorage int64
    // We store allowedPodNumber (which is Node.Status.Allocatable.Pods().Value())
    // explicitly as int, to avoid conversions and improve performance.
    AllowedPodNumber int
    // ScalarResources
    ScalarResources map[v1.ResourceName]int64

Resource is a collection of compute resource.

func NewResource Uses

func NewResource(rl v1.ResourceList) *Resource

NewResource creates a Resource from ResourceList

func (*Resource) Add Uses

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

Add adds ResourceList into Resource.

func (*Resource) AddScalar Uses

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

AddScalar adds a resource by a scalar value of this resource.

func (*Resource) Clone Uses

func (r *Resource) Clone() *Resource

Clone returns a copy of this resource.

func (*Resource) ResourceList Uses

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

ResourceList returns a resource list of this resource.

func (*Resource) SetMaxResource Uses

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

SetMaxResource compares with ResourceList and takes max value for each Resource.

func (*Resource) SetScalar Uses

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

SetScalar sets a resource by a scalar value of this resource.

type Snapshot Uses

type Snapshot struct {
    AssumedPods map[string]bool
    Nodes       map[string]*NodeInfo
    Pdbs        map[string]*policy.PodDisruptionBudget

Snapshot is a snapshot of cache state

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