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Add preemption in scheduler extender

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Add verb and preemption for scheduler extender

Update bazel

Use simple preemption in extender

Use node name instead of v1.Node

Fix support method

Fix preemption dup

Remove uneeded logics

Remove nodeInfo from param to extender

Update bazel for scheduler types

Mock extender cache with nodeInfo

Add nodeInfo as extender cache

Choose node name or node based on cache flag

Always return meta victims in result
This commit is contained in:
Harry Zhang
2017-11-17 10:21:03 +08:00
committed by Harry Zhang
parent 79257fe611
commit 71603f2f85
13 changed files with 767 additions and 104 deletions
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21
pkg/scheduler/algorithm/scheduler_interface.go
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@@ -29,7 +29,9 @@ type SchedulerExtender interface {
// 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.
Filter(pod *v1.Pod, nodes []*v1.Node, nodeNameToInfo map[string]*schedulercache.NodeInfo) (filteredNodes []*v1.Node, failedNodesMap schedulerapi.FailedNodesMap, err error)
Filter(pod *v1.Pod,
nodes []*v1.Node, nodeNameToInfo map[string]*schedulercache.NodeInfo,
) (filteredNodes []*v1.Node, failedNodesMap schedulerapi.FailedNodesMap, err error)
// Prioritize based on extender-implemented priority functions. The returned scores & weight
// are used to compute the weighted score for an extender. The weighted scores are added to
@@ -45,6 +47,23 @@ type SchedulerExtender interface {
// IsInterested returns true if at least one extended resource requested by
// this pod is managed by this extender.
IsInterested(pod *v1.Pod) bool
// ProcessPreemption returns nodes with their victim pods processed by extender based on
// given:
// 1. Pod to schedule
// 2. Candidate nodes and victim pods (nodeToVictims) generated by previous scheduling process.
// 3. nodeNameToInfo to restore v1.Node from node name if extender cache is enabled.
// The possible changes made by extender may include:
// 1. Subset of given candidate nodes after preemption phase of extender.
// 2. A different set of victim pod for every given candidate node after preemption phase of extender.
ProcessPreemption(
pod *v1.Pod,
nodeToVictims map[*v1.Node]*schedulerapi.Victims,
nodeNameToInfo map[string]*schedulercache.NodeInfo,
) (map[*v1.Node]*schedulerapi.Victims, error)
// SupportsPreemption returns if the scheduler extender support preemption or not.
SupportsPreemption() bool
}
// ScheduleAlgorithm is an interface implemented by things that know how to schedule pods