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80 lines
2.9 KiB
Go
80 lines
2.9 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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var sumSize int64
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for i := range pod.Spec.Containers {
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sumSize += checkContainerImageOnNode(node, &pod.Spec.Containers[i])
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}
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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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var score int
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switch {
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case sumSize == 0 || sumSize < minImgSize:
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// score == 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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score = 0
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// If existing images' total size is larger than max, just make it highest priority.
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case sumSize >= maxImgSize:
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score = schedulerapi.MaxPriority
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default:
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score = int((int64(schedulerapi.MaxPriority) * (sumSize - minImgSize) / (maxImgSize - minImgSize)) + 1)
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}
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// Return which bucket the given size belongs to
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return score
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}
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// checkContainerImageOnNode checks if a container image is present on a node and returns its size.
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func checkContainerImageOnNode(node *v1.Node, container *v1.Container) int64 {
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for _, image := range node.Status.Images {
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for _, name := range image.Names {
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if container.Image == name {
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// Should return immediately.
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return image.SizeBytes
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}
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}
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}
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return 0
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}
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