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https://github.com/kubernetes-sigs/descheduler.git
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d1c64c48cd
Turning a usage client into an interface allows to implement other kinds of usage clients like actual usage or prometheus based resource collection.
103 lines
3.3 KiB
Go
103 lines
3.3 KiB
Go
/*
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Copyright 2024 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 nodeutilization
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import (
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"fmt"
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v1 "k8s.io/api/core/v1"
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"k8s.io/apimachinery/pkg/api/resource"
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"k8s.io/klog/v2"
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utilptr "k8s.io/utils/ptr"
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nodeutil "sigs.k8s.io/descheduler/pkg/descheduler/node"
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podutil "sigs.k8s.io/descheduler/pkg/descheduler/pod"
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"sigs.k8s.io/descheduler/pkg/utils"
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)
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type usageClient interface {
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// Both low/high node utilization plugins are expected to invoke sync right
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// after Balance method is invoked. There's no cache invalidation so each
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// Balance is expected to get the latest data by invoking sync.
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sync(nodes []*v1.Node) error
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nodeUtilization(node string) map[v1.ResourceName]*resource.Quantity
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pods(node string) []*v1.Pod
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podUsage(pod *v1.Pod) (map[v1.ResourceName]*resource.Quantity, error)
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}
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type requestedUsageClient struct {
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resourceNames []v1.ResourceName
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getPodsAssignedToNode podutil.GetPodsAssignedToNodeFunc
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_pods map[string][]*v1.Pod
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_nodeUtilization map[string]map[v1.ResourceName]*resource.Quantity
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}
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var _ usageClient = &requestedUsageClient{}
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func newRequestedUsageClient(
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resourceNames []v1.ResourceName,
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getPodsAssignedToNode podutil.GetPodsAssignedToNodeFunc,
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) *requestedUsageClient {
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return &requestedUsageClient{
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resourceNames: resourceNames,
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getPodsAssignedToNode: getPodsAssignedToNode,
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}
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}
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func (s *requestedUsageClient) nodeUtilization(node string) map[v1.ResourceName]*resource.Quantity {
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return s._nodeUtilization[node]
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}
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func (s *requestedUsageClient) pods(node string) []*v1.Pod {
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return s._pods[node]
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}
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func (s *requestedUsageClient) podUsage(pod *v1.Pod) (map[v1.ResourceName]*resource.Quantity, error) {
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usage := make(map[v1.ResourceName]*resource.Quantity)
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for _, resourceName := range s.resourceNames {
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usage[resourceName] = utilptr.To[resource.Quantity](utils.GetResourceRequestQuantity(pod, resourceName).DeepCopy())
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}
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return usage, nil
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}
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func (s *requestedUsageClient) sync(nodes []*v1.Node) error {
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s._nodeUtilization = make(map[string]map[v1.ResourceName]*resource.Quantity)
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s._pods = make(map[string][]*v1.Pod)
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for _, node := range nodes {
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pods, err := podutil.ListPodsOnANode(node.Name, s.getPodsAssignedToNode, nil)
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if err != nil {
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klog.V(2).InfoS("Node will not be processed, error accessing its pods", "node", klog.KObj(node), "err", err)
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return fmt.Errorf("error accessing %q node's pods: %v", node.Name, err)
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}
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nodeUsage, err := nodeutil.NodeUtilization(pods, s.resourceNames, func(pod *v1.Pod) (v1.ResourceList, error) {
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req, _ := utils.PodRequestsAndLimits(pod)
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return req, nil
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})
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if err != nil {
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return err
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}
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// store the snapshot of pods from the same (or the closest) node utilization computation
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s._pods[node.Name] = pods
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s._nodeUtilization[node.Name] = nodeUsage
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}
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return nil
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}
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