291 lines
10 KiB
Go
291 lines
10 KiB
Go
package descheduler
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import (
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"context"
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"fmt"
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"time"
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corev1 "k8s.io/api/core/v1"
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apierrors "k8s.io/apimachinery/pkg/api/errors"
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metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
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"k8s.io/apimachinery/pkg/labels"
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"k8s.io/apimachinery/pkg/util/wait"
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"k8s.io/client-go/kubernetes"
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v1core "k8s.io/client-go/kubernetes/typed/core/v1"
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"k8s.io/client-go/tools/cache"
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"k8s.io/client-go/tools/record"
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"k8s.io/klog/v2"
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"github.com/karmada-io/karmada/cmd/descheduler/app/options"
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clusterv1alpha1 "github.com/karmada-io/karmada/pkg/apis/cluster/v1alpha1"
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workv1alpha2 "github.com/karmada-io/karmada/pkg/apis/work/v1alpha2"
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"github.com/karmada-io/karmada/pkg/descheduler/core"
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estimatorclient "github.com/karmada-io/karmada/pkg/estimator/client"
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karmadaclientset "github.com/karmada-io/karmada/pkg/generated/clientset/versioned"
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informerfactory "github.com/karmada-io/karmada/pkg/generated/informers/externalversions"
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clusterlister "github.com/karmada-io/karmada/pkg/generated/listers/cluster/v1alpha1"
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worklister "github.com/karmada-io/karmada/pkg/generated/listers/work/v1alpha2"
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"github.com/karmada-io/karmada/pkg/util"
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"github.com/karmada-io/karmada/pkg/util/gclient"
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)
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const (
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descheduleSuccessMessage = "Binding has been descheduled"
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)
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// Descheduler is the descheduler schema, which is used to evict replicas from specific clusters
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type Descheduler struct {
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KarmadaClient karmadaclientset.Interface
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KubeClient kubernetes.Interface
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informerFactory informerfactory.SharedInformerFactory
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bindingInformer cache.SharedIndexInformer
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bindingLister worklister.ResourceBindingLister
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clusterInformer cache.SharedIndexInformer
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clusterLister clusterlister.ClusterLister
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eventRecorder record.EventRecorder
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schedulerEstimatorCache *estimatorclient.SchedulerEstimatorCache
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schedulerEstimatorPort int
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schedulerEstimatorWorker util.AsyncWorker
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unschedulableThreshold time.Duration
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deschedulingInterval time.Duration
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deschedulerWorker util.AsyncWorker
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}
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// NewDescheduler instantiates a descheduler
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func NewDescheduler(karmadaClient karmadaclientset.Interface, kubeClient kubernetes.Interface, opts *options.Options) *Descheduler {
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factory := informerfactory.NewSharedInformerFactory(karmadaClient, 0)
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desched := &Descheduler{
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KarmadaClient: karmadaClient,
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KubeClient: kubeClient,
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informerFactory: factory,
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bindingInformer: factory.Work().V1alpha2().ResourceBindings().Informer(),
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bindingLister: factory.Work().V1alpha2().ResourceBindings().Lister(),
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clusterInformer: factory.Cluster().V1alpha1().Clusters().Informer(),
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clusterLister: factory.Cluster().V1alpha1().Clusters().Lister(),
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schedulerEstimatorCache: estimatorclient.NewSchedulerEstimatorCache(),
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schedulerEstimatorPort: opts.SchedulerEstimatorPort,
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unschedulableThreshold: opts.UnschedulableThreshold.Duration,
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deschedulingInterval: opts.DeschedulingInterval.Duration,
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}
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schedulerEstimatorWorkerOptions := util.Options{
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Name: "scheduler-estimator",
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KeyFunc: nil,
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ReconcileFunc: desched.reconcileEstimatorConnection,
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}
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desched.schedulerEstimatorWorker = util.NewAsyncWorker(schedulerEstimatorWorkerOptions)
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schedulerEstimator := estimatorclient.NewSchedulerEstimator(desched.schedulerEstimatorCache, opts.SchedulerEstimatorTimeout.Duration)
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estimatorclient.RegisterSchedulerEstimator(schedulerEstimator)
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deschedulerWorkerOptions := util.Options{
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Name: "descheduler",
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KeyFunc: util.MetaNamespaceKeyFunc,
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ReconcileFunc: desched.worker,
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}
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desched.deschedulerWorker = util.NewAsyncWorker(deschedulerWorkerOptions)
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desched.clusterInformer.AddEventHandler(cache.ResourceEventHandlerFuncs{
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AddFunc: desched.addCluster,
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UpdateFunc: desched.updateCluster,
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DeleteFunc: desched.deleteCluster,
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})
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eventBroadcaster := record.NewBroadcaster()
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eventBroadcaster.StartStructuredLogging(0)
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eventBroadcaster.StartRecordingToSink(&v1core.EventSinkImpl{Interface: kubeClient.CoreV1().Events("")})
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desched.eventRecorder = eventBroadcaster.NewRecorder(gclient.NewSchema(), corev1.EventSource{Component: "karmada-descheduler"})
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return desched
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}
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// Run runs the scheduler
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func (d *Descheduler) Run(ctx context.Context) {
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stopCh := ctx.Done()
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klog.Infof("Starting karmada descheduler")
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defer klog.Infof("Shutting down karmada descheduler")
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// Establish all connections first and then begin scheduling.
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d.establishEstimatorConnections()
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d.schedulerEstimatorWorker.Run(1, stopCh)
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d.informerFactory.Start(stopCh)
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if !cache.WaitForCacheSync(stopCh, d.bindingInformer.HasSynced, d.clusterInformer.HasSynced) {
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klog.Errorf("Failed to wait for cache sync")
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}
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go wait.Until(d.descheduleOnce, d.deschedulingInterval, stopCh)
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d.deschedulerWorker.Run(1, stopCh)
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<-stopCh
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}
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func (d *Descheduler) descheduleOnce() {
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bindings, err := d.bindingLister.List(labels.Everything())
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if err != nil {
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klog.Errorf("List all ResourceBindings error: %v", err)
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}
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bindings = core.FilterBindings(bindings)
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for _, binding := range bindings {
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d.deschedulerWorker.Enqueue(binding)
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}
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}
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func (d *Descheduler) worker(key util.QueueKey) error {
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namespacedName, ok := key.(string)
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if !ok {
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return fmt.Errorf("failed to deschedule as invalid key: %v", key)
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}
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namespace, name, err := cache.SplitMetaNamespaceKey(namespacedName)
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if err != nil {
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return fmt.Errorf("invalid resource key: %s", namespacedName)
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}
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binding, err := d.bindingLister.ResourceBindings(namespace).Get(name)
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if err != nil {
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if apierrors.IsNotFound(err) {
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klog.Infof("ResourceBinding(%s) in work queue no longer exists, ignore.", namespacedName)
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return nil
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}
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return fmt.Errorf("get ResourceBinding(%s) error: %v", namespacedName, err)
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}
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h := core.NewSchedulingResultHelper(binding)
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if _, undesiredClusters := h.GetUndesiredClusters(); len(undesiredClusters) == 0 {
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return nil
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}
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h.FillUnschedulableReplicas(d.unschedulableThreshold)
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klog.V(3).Infof("Unschedulable result of resource(%s): %v", namespacedName, h.TargetClusters)
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return d.updateScheduleResult(h)
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}
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func (d *Descheduler) updateScheduleResult(h *core.SchedulingResultHelper) error {
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unschedulableSum := int32(0)
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message := descheduleSuccessMessage
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binding := h.ResourceBinding.DeepCopy()
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for i, cluster := range h.TargetClusters {
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if cluster.Unschedulable > 0 && cluster.Spec >= cluster.Unschedulable {
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target := cluster.Spec - cluster.Unschedulable
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// The target cluster replicas must not be less than ready replicas.
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if target < cluster.Ready && cluster.Ready <= cluster.Spec {
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target = cluster.Ready
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}
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binding.Spec.Clusters[i].Replicas = target
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unschedulable := cluster.Spec - target
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unschedulableSum += unschedulable
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message += fmt.Sprintf(", %d replica(s) in cluster(%s)", unschedulable, cluster.ClusterName)
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}
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}
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if unschedulableSum == 0 {
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return nil
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}
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message = fmt.Sprintf(", %d total descheduled replica(s)", unschedulableSum) + message
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var err error
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defer func() {
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d.recordDescheduleResultEventForResourceBinding(binding, message, err)
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}()
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binding, err = d.KarmadaClient.WorkV1alpha2().ResourceBindings(binding.Namespace).Update(context.TODO(), binding, metav1.UpdateOptions{})
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if err != nil {
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return err
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}
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return nil
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}
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func (d *Descheduler) addCluster(obj interface{}) {
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cluster, ok := obj.(*clusterv1alpha1.Cluster)
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if !ok {
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klog.Errorf("Cannot convert to Cluster: %v", obj)
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return
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}
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klog.V(4).Infof("Receiving add event for cluster %s", cluster.Name)
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d.schedulerEstimatorWorker.Add(cluster.Name)
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}
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func (d *Descheduler) updateCluster(_, newObj interface{}) {
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cluster, ok := newObj.(*clusterv1alpha1.Cluster)
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if !ok {
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klog.Errorf("Cannot convert to Cluster: %v", newObj)
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return
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}
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klog.V(4).Infof("Receiving update event for cluster %s", cluster.Name)
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d.schedulerEstimatorWorker.Add(cluster.Name)
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}
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func (d *Descheduler) deleteCluster(obj interface{}) {
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var cluster *clusterv1alpha1.Cluster
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switch t := obj.(type) {
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case *clusterv1alpha1.Cluster:
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cluster = t
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case cache.DeletedFinalStateUnknown:
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var ok bool
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cluster, ok = t.Obj.(*clusterv1alpha1.Cluster)
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if !ok {
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klog.Errorf("Cannot convert to clusterv1alpha1.Cluster: %v", t.Obj)
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return
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}
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default:
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klog.Errorf("Cannot convert to clusterv1alpha1.Cluster: %v", t)
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return
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}
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klog.V(4).Infof("Receiving delete event for cluster %s", cluster.Name)
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d.schedulerEstimatorWorker.Add(cluster.Name)
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}
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func (d *Descheduler) establishEstimatorConnections() {
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clusterList, err := d.KarmadaClient.ClusterV1alpha1().Clusters().List(context.TODO(), metav1.ListOptions{})
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if err != nil {
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klog.Errorf("Cannot list all clusters when establish all cluster estimator connections: %v", err)
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return
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}
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for i := range clusterList.Items {
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if err = estimatorclient.EstablishConnection(clusterList.Items[i].Name, d.schedulerEstimatorCache, d.schedulerEstimatorPort); err != nil {
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klog.Error(err)
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}
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}
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}
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func (d *Descheduler) reconcileEstimatorConnection(key util.QueueKey) error {
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name, ok := key.(string)
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if !ok {
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return fmt.Errorf("failed to reconcile estimator connection as invalid key: %v", key)
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}
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_, err := d.clusterLister.Get(name)
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if err != nil {
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if apierrors.IsNotFound(err) {
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d.schedulerEstimatorCache.DeleteCluster(name)
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return nil
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}
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return err
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}
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return estimatorclient.EstablishConnection(name, d.schedulerEstimatorCache, d.schedulerEstimatorPort)
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}
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func (d *Descheduler) recordDescheduleResultEventForResourceBinding(rb *workv1alpha2.ResourceBinding, message string, err error) {
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if rb == nil {
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return
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}
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ref := &corev1.ObjectReference{
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Kind: rb.Spec.Resource.Kind,
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APIVersion: rb.Spec.Resource.APIVersion,
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Namespace: rb.Spec.Resource.Namespace,
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Name: rb.Spec.Resource.Name,
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UID: rb.Spec.Resource.UID,
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}
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if err == nil {
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d.eventRecorder.Event(rb, corev1.EventTypeNormal, workv1alpha2.EventReasonDescheduleBindingSucceed, message)
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d.eventRecorder.Event(ref, corev1.EventTypeNormal, workv1alpha2.EventReasonDescheduleBindingSucceed, message)
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} else {
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d.eventRecorder.Event(rb, corev1.EventTypeWarning, workv1alpha2.EventReasonDescheduleBindingFailed, err.Error())
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d.eventRecorder.Event(ref, corev1.EventTypeWarning, workv1alpha2.EventReasonDescheduleBindingFailed, err.Error())
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}
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}
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