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4a08dff168
Add Preempt to scheduler interface Add preemption to the scheduling workflow Minor changes to the scheduler integration test library
61 lines
2.7 KiB
Go
61 lines
2.7 KiB
Go
/*
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Copyright 2014 The Kubernetes Authors.
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Licensed under the Apache License, Version 2.0 (the "License");
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you may not use this file except in compliance with the License.
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You may obtain a copy of the License at
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http://www.apache.org/licenses/LICENSE-2.0
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Unless required by applicable law or agreed to in writing, software
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distributed under the License is distributed on an "AS IS" BASIS,
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WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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See the License for the specific language governing permissions and
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limitations under the License.
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*/
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package algorithm
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import (
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"k8s.io/api/core/v1"
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schedulerapi "k8s.io/kubernetes/plugin/pkg/scheduler/api"
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"k8s.io/kubernetes/plugin/pkg/scheduler/schedulercache"
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)
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// SchedulerExtender is an interface for external processes to influence scheduling
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// decisions made by Kubernetes. This is typically needed for resources not directly
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// managed by Kubernetes.
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type SchedulerExtender interface {
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// Filter based on extender-implemented predicate functions. The filtered list is
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// expected to be a subset of the supplied list. failedNodesMap optionally contains
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// the list of failed nodes and failure reasons.
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Filter(pod *v1.Pod, nodes []*v1.Node, nodeNameToInfo map[string]*schedulercache.NodeInfo) (filteredNodes []*v1.Node, failedNodesMap schedulerapi.FailedNodesMap, err error)
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// Prioritize based on extender-implemented priority functions. The returned scores & weight
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// are used to compute the weighted score for an extender. The weighted scores are added to
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// the scores computed by Kubernetes scheduler. The total scores are used to do the host selection.
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Prioritize(pod *v1.Pod, nodes []*v1.Node) (hostPriorities *schedulerapi.HostPriorityList, weight int, err error)
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// Bind delegates the action of binding a pod to a node to the extender.
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Bind(binding *v1.Binding) error
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// IsBinder returns whether this extender is configured for the Bind method.
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IsBinder() bool
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}
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// ScheduleAlgorithm is an interface implemented by things that know how to schedule pods
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// onto machines.
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type ScheduleAlgorithm interface {
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Schedule(*v1.Pod, NodeLister) (selectedMachine string, err error)
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// Preempt receives scheduling errors for a pod and tries to create room for
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// the pod by preempting lower priority pods if possible.
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// It returns the node where preemption happened, a list of preempted pods, and error if any.
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Preempt(*v1.Pod, NodeLister, error) (selectedNode *v1.Node, preemptedPods []*v1.Pod, err error)
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// Predicates() returns a pointer to a map of predicate functions. This is
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// exposed for testing.
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Predicates() map[string]FitPredicate
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// Prioritizers returns a slice of priority config. This is exposed for
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// testing.
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Prioritizers() []PriorityConfig
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}
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