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updater.go
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updater.go
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/*
Copyright 2017 The Kubernetes Authors.
Licensed under the Apache License, Version 2.0 (the "License");
you may not use this file except in compliance with the License.
You may obtain a copy of the License at
http://www.apache.org/licenses/LICENSE-2.0
Unless required by applicable law or agreed to in writing, software
distributed under the License is distributed on an "AS IS" BASIS,
WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
See the License for the specific language governing permissions and
limitations under the License.
*/
package logic
import (
"context"
"fmt"
"time"
"golang.org/x/time/rate"
apiv1 "k8s.io/api/core/v1"
"k8s.io/apimachinery/pkg/fields"
"k8s.io/apimachinery/pkg/labels"
kube_client "k8s.io/client-go/kubernetes"
"k8s.io/client-go/kubernetes/fake"
"k8s.io/client-go/kubernetes/scheme"
clientv1 "k8s.io/client-go/kubernetes/typed/core/v1"
v1lister "k8s.io/client-go/listers/core/v1"
"k8s.io/client-go/tools/cache"
"k8s.io/client-go/tools/record"
"k8s.io/klog/v2"
vpa_types "k8s.io/autoscaler/vertical-pod-autoscaler/pkg/apis/autoscaling.k8s.io/v1"
vpa_clientset "k8s.io/autoscaler/vertical-pod-autoscaler/pkg/client/clientset/versioned"
vpa_lister "k8s.io/autoscaler/vertical-pod-autoscaler/pkg/client/listers/autoscaling.k8s.io/v1"
"k8s.io/autoscaler/vertical-pod-autoscaler/pkg/target"
controllerfetcher "k8s.io/autoscaler/vertical-pod-autoscaler/pkg/target/controller_fetcher"
"k8s.io/autoscaler/vertical-pod-autoscaler/pkg/updater/eviction"
"k8s.io/autoscaler/vertical-pod-autoscaler/pkg/updater/priority"
metrics_updater "k8s.io/autoscaler/vertical-pod-autoscaler/pkg/utils/metrics/updater"
"k8s.io/autoscaler/vertical-pod-autoscaler/pkg/utils/status"
vpa_api_util "k8s.io/autoscaler/vertical-pod-autoscaler/pkg/utils/vpa"
)
// Updater performs updates on pods if recommended by Vertical Pod Autoscaler
type Updater interface {
// RunOnce represents single iteration in the main-loop of Updater
RunOnce(context.Context)
}
type updater struct {
vpaLister vpa_lister.VerticalPodAutoscalerLister
podLister v1lister.PodLister
eventRecorder record.EventRecorder
evictionFactory eviction.PodsEvictionRestrictionFactory
recommendationProcessor vpa_api_util.RecommendationProcessor
evictionAdmission priority.PodEvictionAdmission
priorityProcessor priority.PriorityProcessor
evictionRateLimiter *rate.Limiter
selectorFetcher target.VpaTargetSelectorFetcher
useAdmissionControllerStatus bool
statusValidator status.Validator
controllerFetcher controllerfetcher.ControllerFetcher
}
// NewUpdater creates Updater with given configuration
func NewUpdater(
kubeClient kube_client.Interface,
vpaClient *vpa_clientset.Clientset,
minReplicasForEvicition int,
evictionRateLimit float64,
evictionRateBurst int,
evictionToleranceFraction float64,
useAdmissionControllerStatus bool,
statusNamespace string,
recommendationProcessor vpa_api_util.RecommendationProcessor,
evictionAdmission priority.PodEvictionAdmission,
selectorFetcher target.VpaTargetSelectorFetcher,
controllerFetcher controllerfetcher.ControllerFetcher,
priorityProcessor priority.PriorityProcessor,
namespace string,
) (Updater, error) {
evictionRateLimiter := getRateLimiter(evictionRateLimit, evictionRateBurst)
factory, err := eviction.NewPodsEvictionRestrictionFactory(kubeClient, minReplicasForEvicition, evictionToleranceFraction)
if err != nil {
return nil, fmt.Errorf("Failed to create eviction restriction factory: %v", err)
}
return &updater{
vpaLister: vpa_api_util.NewVpasLister(vpaClient, make(chan struct{}), namespace),
podLister: newPodLister(kubeClient, namespace),
eventRecorder: newEventRecorder(kubeClient),
evictionFactory: factory,
recommendationProcessor: recommendationProcessor,
evictionRateLimiter: evictionRateLimiter,
evictionAdmission: evictionAdmission,
priorityProcessor: priorityProcessor,
selectorFetcher: selectorFetcher,
controllerFetcher: controllerFetcher,
useAdmissionControllerStatus: useAdmissionControllerStatus,
statusValidator: status.NewValidator(
kubeClient,
status.AdmissionControllerStatusName,
statusNamespace,
),
}, nil
}
// RunOnce represents single iteration in the main-loop of Updater
func (u *updater) RunOnce(ctx context.Context) {
timer := metrics_updater.NewExecutionTimer()
defer timer.ObserveTotal()
if u.useAdmissionControllerStatus {
isValid, err := u.statusValidator.IsStatusValid(status.AdmissionControllerStatusTimeout)
if err != nil {
klog.Errorf("Error getting Admission Controller status: %v. Skipping eviction loop", err)
return
}
if !isValid {
klog.Warningf("Admission Controller status has been refreshed more than %v ago. Skipping eviction loop",
status.AdmissionControllerStatusTimeout)
return
}
}
vpaList, err := u.vpaLister.List(labels.Everything())
if err != nil {
klog.Fatalf("failed get VPA list: %v", err)
}
timer.ObserveStep("ListVPAs")
vpas := make([]*vpa_api_util.VpaWithSelector, 0)
for _, vpa := range vpaList {
if vpa_api_util.GetUpdateMode(vpa) != vpa_types.UpdateModeRecreate &&
vpa_api_util.GetUpdateMode(vpa) != vpa_types.UpdateModeAuto {
klog.V(3).Infof("skipping VPA object %v because its mode is not \"Recreate\" or \"Auto\"", vpa.Name)
continue
}
selector, err := u.selectorFetcher.Fetch(vpa)
if err != nil {
klog.V(3).Infof("skipping VPA object %v because we cannot fetch selector", vpa.Name)
continue
}
vpas = append(vpas, &vpa_api_util.VpaWithSelector{
Vpa: vpa,
Selector: selector,
})
}
if len(vpas) == 0 {
klog.Warningf("no VPA objects to process")
if u.evictionAdmission != nil {
u.evictionAdmission.CleanUp()
}
return
}
podsList, err := u.podLister.List(labels.Everything())
if err != nil {
klog.Errorf("failed to get pods list: %v", err)
return
}
timer.ObserveStep("ListPods")
allLivePods := filterDeletedPods(podsList)
controlledPods := make(map[*vpa_types.VerticalPodAutoscaler][]*apiv1.Pod)
for _, pod := range allLivePods {
controllingVPA := vpa_api_util.GetControllingVPAForPod(pod, vpas, u.controllerFetcher)
if controllingVPA != nil {
controlledPods[controllingVPA.Vpa] = append(controlledPods[controllingVPA.Vpa], pod)
}
}
timer.ObserveStep("FilterPods")
if u.evictionAdmission != nil {
u.evictionAdmission.LoopInit(allLivePods, controlledPods)
}
timer.ObserveStep("AdmissionInit")
// wrappers for metrics which are computed every loop run
controlledPodsCounter := metrics_updater.NewControlledPodsCounter()
evictablePodsCounter := metrics_updater.NewEvictablePodsCounter()
vpasWithEvictablePodsCounter := metrics_updater.NewVpasWithEvictablePodsCounter()
vpasWithEvictedPodsCounter := metrics_updater.NewVpasWithEvictedPodsCounter()
// using defer to protect against 'return' after evictionRateLimiter.Wait
defer controlledPodsCounter.Observe()
defer evictablePodsCounter.Observe()
defer vpasWithEvictablePodsCounter.Observe()
defer vpasWithEvictedPodsCounter.Observe()
// NOTE: this loop assumes that controlledPods are filtered
// to contain only Pods controlled by a VPA in auto or recreate mode
for vpa, livePods := range controlledPods {
vpaSize := len(livePods)
controlledPodsCounter.Add(vpaSize, vpaSize)
evictionLimiter := u.evictionFactory.NewPodsEvictionRestriction(livePods, vpa)
podsForUpdate := u.getPodsUpdateOrder(filterNonEvictablePods(livePods, evictionLimiter), vpa)
evictablePodsCounter.Add(vpaSize, len(podsForUpdate))
withEvictable := false
withEvicted := false
for _, pod := range podsForUpdate {
withEvictable = true
if !evictionLimiter.CanEvict(pod) {
continue
}
err := u.evictionRateLimiter.Wait(ctx)
if err != nil {
klog.Warningf("evicting pod %v failed: %v", pod.Name, err)
return
}
klog.V(2).Infof("evicting pod %v", pod.Name)
evictErr := evictionLimiter.Evict(pod, u.eventRecorder)
if evictErr != nil {
klog.Warningf("evicting pod %v failed: %v", pod.Name, evictErr)
} else {
withEvicted = true
metrics_updater.AddEvictedPod(vpaSize)
}
}
if withEvictable {
vpasWithEvictablePodsCounter.Add(vpaSize, 1)
}
if withEvicted {
vpasWithEvictedPodsCounter.Add(vpaSize, 1)
}
}
timer.ObserveStep("EvictPods")
}
func getRateLimiter(evictionRateLimit float64, evictionRateLimitBurst int) *rate.Limiter {
var evictionRateLimiter *rate.Limiter
if evictionRateLimit <= 0 {
// As a special case if the rate is set to rate.Inf, the burst rate is ignored
// see https://github.com/golang/time/blob/master/rate/rate.go#L37
evictionRateLimiter = rate.NewLimiter(rate.Inf, 0)
klog.V(1).Info("Rate limit disabled")
} else {
evictionRateLimiter = rate.NewLimiter(rate.Limit(evictionRateLimit), evictionRateLimitBurst)
}
return evictionRateLimiter
}
// getPodsUpdateOrder returns list of pods that should be updated ordered by update priority
func (u *updater) getPodsUpdateOrder(pods []*apiv1.Pod, vpa *vpa_types.VerticalPodAutoscaler) []*apiv1.Pod {
priorityCalculator := priority.NewUpdatePriorityCalculator(
vpa,
nil,
u.recommendationProcessor,
u.priorityProcessor)
for _, pod := range pods {
priorityCalculator.AddPod(pod, time.Now())
}
return priorityCalculator.GetSortedPods(u.evictionAdmission)
}
func filterNonEvictablePods(pods []*apiv1.Pod, evictionRestriction eviction.PodsEvictionRestriction) []*apiv1.Pod {
result := make([]*apiv1.Pod, 0)
for _, pod := range pods {
if evictionRestriction.CanEvict(pod) {
result = append(result, pod)
}
}
return result
}
func filterDeletedPods(pods []*apiv1.Pod) []*apiv1.Pod {
result := make([]*apiv1.Pod, 0)
for _, pod := range pods {
if pod.DeletionTimestamp == nil {
result = append(result, pod)
}
}
return result
}
func newPodLister(kubeClient kube_client.Interface, namespace string) v1lister.PodLister {
selector := fields.ParseSelectorOrDie("spec.nodeName!=" + "" + ",status.phase!=" +
string(apiv1.PodSucceeded) + ",status.phase!=" + string(apiv1.PodFailed))
podListWatch := cache.NewListWatchFromClient(kubeClient.CoreV1().RESTClient(), "pods", namespace, selector)
store := cache.NewIndexer(cache.MetaNamespaceKeyFunc, cache.Indexers{cache.NamespaceIndex: cache.MetaNamespaceIndexFunc})
podLister := v1lister.NewPodLister(store)
podReflector := cache.NewReflector(podListWatch, &apiv1.Pod{}, store, time.Hour)
stopCh := make(chan struct{})
go podReflector.Run(stopCh)
return podLister
}
func newEventRecorder(kubeClient kube_client.Interface) record.EventRecorder {
eventBroadcaster := record.NewBroadcaster()
eventBroadcaster.StartLogging(klog.V(4).Infof)
if _, isFake := kubeClient.(*fake.Clientset); !isFake {
eventBroadcaster.StartRecordingToSink(&clientv1.EventSinkImpl{Interface: clientv1.New(kubeClient.CoreV1().RESTClient()).Events("")})
}
return eventBroadcaster.NewRecorder(scheme.Scheme, apiv1.EventSource{Component: "vpa-updater"})
}