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71 lines
2.9 KiB
Go
71 lines
2.9 KiB
Go
/*
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Copyright 2020 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 v1alpha1
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import (
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v1 "k8s.io/api/core/v1"
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extenderv1 "k8s.io/kube-scheduler/extender/v1"
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)
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// Extender 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 Extender interface {
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// Name returns a unique name that identifies the extender.
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Name() string
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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) (filteredNodes []*v1.Node, failedNodesMap extenderv1.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 *extenderv1.HostPriorityList, weight int64, 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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// IsInterested returns true if at least one extended resource requested by
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// this pod is managed by this extender.
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IsInterested(pod *v1.Pod) bool
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// ProcessPreemption returns nodes with their victim pods processed by extender based on
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// given:
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// 1. Pod to schedule
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// 2. Candidate nodes and victim pods (nodeNameToVictims) generated by previous scheduling process.
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// The possible changes made by extender may include:
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// 1. Subset of given candidate nodes after preemption phase of extender.
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// 2. A different set of victim pod for every given candidate node after preemption phase of extender.
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ProcessPreemption(
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pod *v1.Pod,
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nodeNameToVictims map[string]*extenderv1.Victims,
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nodeInfos NodeInfoLister,
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) (map[string]*extenderv1.Victims, error)
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// SupportsPreemption returns if the scheduler extender support preemption or not.
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SupportsPreemption() bool
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// IsIgnorable returns true indicates scheduling should not fail when this extender
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// is unavailable. This gives scheduler ability to fail fast and tolerate non-critical extenders as well.
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IsIgnorable() bool
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}
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