dda62ec207
node cache don't need to get all the information about every candidate node. For huge clusters, sending full node information of all nodes in the cluster on the wire every time a pod is scheduled is expensive. If the scheduler is capable of caching node information along with its capabilities, sending node name alone is sufficient. These changes provide that optimization in a backward compatible way - removed the inadvertent signature change of Prioritize() function - added defensive checks as suggested - added annotation specific test case - updated the comments in the scheduler types - got rid of apiVersion thats unused - using *v1.NodeList as suggested - backing out pod annotation update related changes made in the 1st commit - Adjusted the comments in types.go and v1/types.go as suggested in the code review
45 lines
1.9 KiB
Go
45 lines
1.9 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/kubernetes/pkg/api/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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}
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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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}
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