Documentation
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Index ¶
- func CreateNodeNameToInfoMap(pods []*v1.Pod, nodes []*v1.Node) map[string]*NodeInfo
- type Cache
- type NodeInfo
- func (n *NodeInfo) AddPod(pod *v1.Pod)
- func (n *NodeInfo) AllocatableResource() Resource
- func (n *NodeInfo) AllowedPodNumber() int
- func (n *NodeInfo) Clone() *NodeInfo
- func (n *NodeInfo) DiskPressureCondition() v1.ConditionStatus
- func (n *NodeInfo) Filter(pod *v1.Pod) bool
- func (n *NodeInfo) FilterOutPods(pods []*v1.Pod) []*v1.Pod
- func (n *NodeInfo) MemoryPressureCondition() v1.ConditionStatus
- func (n *NodeInfo) Node() *v1.Node
- func (n *NodeInfo) NonZeroRequest() Resource
- func (n *NodeInfo) Pods() []*v1.Pod
- func (n *NodeInfo) PodsWithAffinity() []*v1.Pod
- func (n *NodeInfo) RemoveNode(node *v1.Node) error
- func (n *NodeInfo) RemovePod(pod *v1.Pod) error
- func (n *NodeInfo) RequestedResource() Resource
- func (n *NodeInfo) SetAllocatableResource(allocatableResource *Resource)
- func (n *NodeInfo) SetNode(node *v1.Node) error
- func (n *NodeInfo) String() string
- func (n *NodeInfo) Taints() ([]v1.Taint, error)
- func (n *NodeInfo) UsedPorts() map[string]bool
- type PodFilter
- type Resource
Constants ¶
This section is empty.
Variables ¶
This section is empty.
Functions ¶
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
// 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)
}
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.
type NodeInfo ¶
type NodeInfo struct {
// contains filtered or unexported fields
}
NodeInfo is node level aggregated information.
func NewNodeInfo ¶
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 ¶
AllocatableResource returns allocatable resources on a given node.
func (*NodeInfo) AllowedPodNumber ¶
func (*NodeInfo) DiskPressureCondition ¶
func (n *NodeInfo) DiskPressureCondition() v1.ConditionStatus
func (*NodeInfo) Filter ¶
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 ¶
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) MemoryPressureCondition ¶
func (n *NodeInfo) MemoryPressureCondition() v1.ConditionStatus
func (*NodeInfo) NonZeroRequest ¶
NonZeroRequest returns aggregated nonzero resource request of pods on this node.
func (*NodeInfo) PodsWithAffinity ¶
PodsWithAffinity return all pods with (anti)affinity constraints on this node.
func (*NodeInfo) RemoveNode ¶
Removes the overall information about the node.
func (*NodeInfo) RequestedResource ¶
RequestedResource returns aggregated resource request of pods on this node.
func (*NodeInfo) SetAllocatableResource ¶
SetAllocatableResource sets the allocatableResource information of given node.
type Resource ¶
type Resource struct {
MilliCPU int64
Memory int64
NvidiaGPU 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 ¶
func NewResource(rl v1.ResourceList) *Resource
New creates a Resource from ResourceList
func (*Resource) Add ¶
func (r *Resource) Add(rl v1.ResourceList)
Add adds ResourceList into Resource.
func (*Resource) ResourceList ¶
func (r *Resource) ResourceList() v1.ResourceList
Source Files