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82 lines
2.8 KiB
Go
82 lines
2.8 KiB
Go
/*
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Copyright 2016 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 priorities
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import (
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"fmt"
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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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// ImageLocalityPriorityMap is a priority function that favors nodes that already have requested pod container's images.
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// It will detect whether the requested images are present on a node, and then calculate a score ranging from 0 to 10
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// based on the total size of those images.
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// - If none of the images are present, this node will be given the lowest priority.
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// - If some of the images are present on a node, the larger their sizes' sum, the higher the node's priority.
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func ImageLocalityPriorityMap(pod *v1.Pod, meta interface{}, nodeInfo *schedulercache.NodeInfo) (schedulerapi.HostPriority, error) {
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node := nodeInfo.Node()
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if node == nil {
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return schedulerapi.HostPriority{}, fmt.Errorf("node not found")
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}
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sumSize := totalImageSize(node, pod.Spec.Containers)
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return schedulerapi.HostPriority{
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Host: node.Name,
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Score: calculateScoreFromSize(sumSize),
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}, nil
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}
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// calculateScoreFromSize calculates the priority of a node. sumSize is sum size of requested images on this node.
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// 1. Split image size range into 10 buckets.
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// 2. Decide the priority of a given sumSize based on which bucket it belongs to.
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func calculateScoreFromSize(sumSize int64) int {
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switch {
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case sumSize == 0 || sumSize < minImgSize:
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// 0 means none of the images required by this pod are present on this
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// node or the total size of the images present is too small to be taken into further consideration.
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return 0
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case sumSize >= maxImgSize:
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// If existing images' total size is larger than max, just make it highest priority.
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return schedulerapi.MaxPriority
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}
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return int((int64(schedulerapi.MaxPriority) * (sumSize - minImgSize) / (maxImgSize - minImgSize)) + 1)
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}
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// totalImageSize returns the total image size of all the containers that are already on the node.
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func totalImageSize(node *v1.Node, containers []v1.Container) int64 {
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imageSizes := make(map[string]int64)
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for _, image := range node.Status.Images {
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for _, name := range image.Names {
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imageSizes[name] = image.SizeBytes
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}
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}
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var total int64
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for _, container := range containers {
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if size, ok := imageSizes[container.Image]; ok {
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total += size
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}
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}
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return total
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}
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