Refactor namespace controller to use workers, do more delete collection calls
This commit is contained in:
derekwaynecarr
@@ -17,19 +17,18 @@ limitations under the License.
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package namespace
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import (
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"fmt"
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"time"
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"k8s.io/kubernetes/pkg/api"
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"k8s.io/kubernetes/pkg/api/errors"
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"k8s.io/kubernetes/pkg/api/unversioned"
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"k8s.io/kubernetes/pkg/client/cache"
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clientset "k8s.io/kubernetes/pkg/client/clientset_generated/internalclientset"
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extensions_unversioned "k8s.io/kubernetes/pkg/client/typed/generated/extensions/unversioned"
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"k8s.io/kubernetes/pkg/controller"
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"k8s.io/kubernetes/pkg/controller/framework"
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"k8s.io/kubernetes/pkg/runtime"
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utilruntime "k8s.io/kubernetes/pkg/util/runtime"
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"k8s.io/kubernetes/pkg/util/sets"
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"k8s.io/kubernetes/pkg/util/wait"
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"k8s.io/kubernetes/pkg/util/workqueue"
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"k8s.io/kubernetes/pkg/watch"
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"github.com/golang/glog"
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@@ -37,14 +36,29 @@ import (
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// NamespaceController is responsible for performing actions dependent upon a namespace phase
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type NamespaceController struct {
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controller *framework.Controller
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StopEverything chan struct{}
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// client that purges namespace content, must have list/delete privileges on all content
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kubeClient clientset.Interface
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// store that holds the namespaces
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store cache.Store
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// controller that observes the namespaces
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controller *framework.Controller
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// namespaces that have been queued up for processing by workers
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queue *workqueue.Type
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// list of versions to process
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versions *unversioned.APIVersions
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}
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// NewNamespaceController creates a new NamespaceController
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func NewNamespaceController(kubeClient clientset.Interface, versions *unversioned.APIVersions, resyncPeriod time.Duration) *NamespaceController {
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var controller *framework.Controller
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_, controller = framework.NewInformer(
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// create the controller so we can inject the enqueue function
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namespaceController := &NamespaceController{
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kubeClient: kubeClient,
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versions: versions,
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queue: workqueue.New(),
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}
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// configure the backing store/controller
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store, controller := framework.NewInformer(
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&cache.ListWatch{
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ListFunc: func(options api.ListOptions) (runtime.Object, error) {
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return kubeClient.Core().Namespaces().List(options)
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@@ -54,530 +68,88 @@ func NewNamespaceController(kubeClient clientset.Interface, versions *unversione
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},
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},
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&api.Namespace{},
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// TODO: Can we have much longer period here?
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resyncPeriod,
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framework.ResourceEventHandlerFuncs{
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AddFunc: func(obj interface{}) {
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namespace := obj.(*api.Namespace)
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if err := syncNamespace(kubeClient, versions, namespace); err != nil {
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if estimate, ok := err.(*contentRemainingError); ok {
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go func() {
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// Estimate is the aggregate total of TerminationGracePeriodSeconds, which defaults to 30s
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// for pods. However, most processes will terminate faster - within a few seconds, probably
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// with a peak within 5-10s. So this division is a heuristic that avoids waiting the full
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// duration when in many cases things complete more quickly. The extra second added is to
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// ensure we never wait 0 seconds.
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t := estimate.Estimate/2 + 1
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glog.V(4).Infof("Content remaining in namespace %s, waiting %d seconds", namespace.Name, t)
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time.Sleep(time.Duration(t) * time.Second)
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if err := controller.Requeue(namespace); err != nil {
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utilruntime.HandleError(err)
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}
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}()
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return
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}
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utilruntime.HandleError(err)
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}
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namespaceController.enqueueNamespace(namespace)
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},
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UpdateFunc: func(oldObj, newObj interface{}) {
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namespace := newObj.(*api.Namespace)
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if err := syncNamespace(kubeClient, versions, namespace); err != nil {
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if estimate, ok := err.(*contentRemainingError); ok {
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go func() {
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t := estimate.Estimate/2 + 1
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glog.V(4).Infof("Content remaining in namespace %s, waiting %d seconds", namespace.Name, t)
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time.Sleep(time.Duration(t) * time.Second)
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if err := controller.Requeue(namespace); err != nil {
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utilruntime.HandleError(err)
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}
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}()
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return
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}
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utilruntime.HandleError(err)
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}
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namespaceController.enqueueNamespace(namespace)
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},
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},
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)
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return &NamespaceController{
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controller: controller,
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}
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namespaceController.store = store
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namespaceController.controller = controller
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return namespaceController
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}
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// Run begins observing the system. It starts a goroutine and returns immediately.
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func (nm *NamespaceController) Run() {
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if nm.StopEverything == nil {
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nm.StopEverything = make(chan struct{})
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go nm.controller.Run(nm.StopEverything)
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// enqueueNamespace adds an object to the controller work queue
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// obj could be an *api.Namespace, or a DeletionFinalStateUnknown item.
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func (nm *NamespaceController) enqueueNamespace(obj interface{}) {
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key, err := controller.KeyFunc(obj)
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if err != nil {
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glog.Errorf("Couldn't get key for object %+v: %v", obj, err)
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return
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}
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nm.queue.Add(key)
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}
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// Stop gracefully shutsdown this controller
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func (nm *NamespaceController) Stop() {
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if nm.StopEverything != nil {
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close(nm.StopEverything)
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nm.StopEverything = nil
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}
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}
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// finalized returns true if the spec.finalizers is empty list
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func finalized(namespace *api.Namespace) bool {
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return len(namespace.Spec.Finalizers) == 0
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}
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// finalize will finalize the namespace for kubernetes
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func finalizeNamespaceFunc(kubeClient clientset.Interface, namespace *api.Namespace) (*api.Namespace, error) {
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namespaceFinalize := api.Namespace{}
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namespaceFinalize.ObjectMeta = namespace.ObjectMeta
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namespaceFinalize.Spec = namespace.Spec
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finalizerSet := sets.NewString()
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for i := range namespace.Spec.Finalizers {
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if namespace.Spec.Finalizers[i] != api.FinalizerKubernetes {
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finalizerSet.Insert(string(namespace.Spec.Finalizers[i]))
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}
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}
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namespaceFinalize.Spec.Finalizers = make([]api.FinalizerName, 0, len(finalizerSet))
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for _, value := range finalizerSet.List() {
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namespaceFinalize.Spec.Finalizers = append(namespaceFinalize.Spec.Finalizers, api.FinalizerName(value))
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}
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namespace, err := kubeClient.Core().Namespaces().Finalize(&namespaceFinalize)
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if err != nil {
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// it was removed already, so life is good
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if errors.IsNotFound(err) {
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return namespace, nil
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}
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}
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return namespace, err
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}
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type contentRemainingError struct {
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Estimate int64
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}
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func (e *contentRemainingError) Error() string {
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return fmt.Sprintf("some content remains in the namespace, estimate %d seconds before it is removed", e.Estimate)
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}
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// deleteAllContent will delete all content known to the system in a namespace. It returns an estimate
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// of the time remaining before the remaining resources are deleted. If estimate > 0 not all resources
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// are guaranteed to be gone.
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func deleteAllContent(kubeClient clientset.Interface, versions *unversioned.APIVersions, namespace string, before unversioned.Time) (estimate int64, err error) {
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err = deleteServiceAccounts(kubeClient, namespace)
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if err != nil {
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return estimate, err
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}
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err = deleteServices(kubeClient, namespace)
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if err != nil {
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return estimate, err
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}
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err = deleteReplicationControllers(kubeClient, namespace)
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if err != nil {
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return estimate, err
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}
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estimate, err = deletePods(kubeClient, namespace, before)
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if err != nil {
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return estimate, err
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}
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err = deleteSecrets(kubeClient, namespace)
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if err != nil {
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return estimate, err
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}
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err = deletePersistentVolumeClaims(kubeClient, namespace)
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if err != nil {
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return estimate, err
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}
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err = deleteLimitRanges(kubeClient, namespace)
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if err != nil {
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return estimate, err
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}
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err = deleteResourceQuotas(kubeClient, namespace)
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if err != nil {
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return estimate, err
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}
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err = deleteEvents(kubeClient, namespace)
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if err != nil {
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return estimate, err
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}
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// If experimental mode, delete all experimental resources for the namespace.
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if containsVersion(versions, "extensions/v1beta1") {
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resources, err := kubeClient.Discovery().ServerResourcesForGroupVersion("extensions/v1beta1")
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if err != nil {
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return estimate, err
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}
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if containsResource(resources, "horizontalpodautoscalers") {
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err = deleteHorizontalPodAutoscalers(kubeClient.Extensions(), namespace)
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if err != nil {
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return estimate, err
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}
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}
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if containsResource(resources, "ingresses") {
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err = deleteIngress(kubeClient.Extensions(), namespace)
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if err != nil {
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return estimate, err
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}
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}
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if containsResource(resources, "daemonsets") {
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err = deleteDaemonSets(kubeClient.Extensions(), namespace)
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if err != nil {
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return estimate, err
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}
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}
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if containsResource(resources, "jobs") {
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err = deleteJobs(kubeClient.Extensions(), namespace)
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if err != nil {
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return estimate, err
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}
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}
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if containsResource(resources, "deployments") {
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err = deleteDeployments(kubeClient.Extensions(), namespace)
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if err != nil {
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return estimate, err
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}
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}
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if containsResource(resources, "replicasets") {
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err = deleteReplicaSets(kubeClient.Extensions(), namespace)
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if err != nil {
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return estimate, err
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}
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}
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}
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return estimate, nil
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}
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// updateNamespaceFunc is a function that makes an update to a namespace
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type updateNamespaceFunc func(kubeClient clientset.Interface, namespace *api.Namespace) (*api.Namespace, error)
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// retryOnConflictError retries the specified fn if there was a conflict error
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// TODO RetryOnConflict should be a generic concept in client code
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func retryOnConflictError(kubeClient clientset.Interface, namespace *api.Namespace, fn updateNamespaceFunc) (result *api.Namespace, err error) {
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latestNamespace := namespace
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// worker processes the queue of namespace objects.
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// Each namespace can be in the queue at most once.
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// The system ensures that no two workers can process
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// the same namespace at the same time.
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func (nm *NamespaceController) worker() {
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for {
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result, err = fn(kubeClient, latestNamespace)
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if err == nil {
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return result, nil
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}
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if !errors.IsConflict(err) {
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return nil, err
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}
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latestNamespace, err = kubeClient.Core().Namespaces().Get(latestNamespace.Name)
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if err != nil {
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return nil, err
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}
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}
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return
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}
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// updateNamespaceStatusFunc will verify that the status of the namespace is correct
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func updateNamespaceStatusFunc(kubeClient clientset.Interface, namespace *api.Namespace) (*api.Namespace, error) {
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if namespace.DeletionTimestamp.IsZero() || namespace.Status.Phase == api.NamespaceTerminating {
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return namespace, nil
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}
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newNamespace := api.Namespace{}
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newNamespace.ObjectMeta = namespace.ObjectMeta
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newNamespace.Status = namespace.Status
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newNamespace.Status.Phase = api.NamespaceTerminating
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return kubeClient.Core().Namespaces().UpdateStatus(&newNamespace)
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}
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// syncNamespace orchestrates deletion of a Namespace and its associated content.
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func syncNamespace(kubeClient clientset.Interface, versions *unversioned.APIVersions, namespace *api.Namespace) error {
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if namespace.DeletionTimestamp == nil {
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return nil
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}
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// multiple controllers may edit a namespace during termination
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// first get the latest state of the namespace before proceeding
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// if the namespace was deleted already, don't do anything
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namespace, err := kubeClient.Core().Namespaces().Get(namespace.Name)
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if err != nil {
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if errors.IsNotFound(err) {
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return nil
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}
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return err
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}
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glog.V(4).Infof("Syncing namespace %s", namespace.Name)
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// ensure that the status is up to date on the namespace
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// if we get a not found error, we assume the namespace is truly gone
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namespace, err = retryOnConflictError(kubeClient, namespace, updateNamespaceStatusFunc)
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if err != nil {
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if errors.IsNotFound(err) {
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return nil
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}
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return err
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}
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// if the namespace is already finalized, delete it
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if finalized(namespace) {
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err = kubeClient.Core().Namespaces().Delete(namespace.Name, nil)
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if err != nil && !errors.IsNotFound(err) {
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return err
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}
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return nil
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}
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// there may still be content for us to remove
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estimate, err := deleteAllContent(kubeClient, versions, namespace.Name, *namespace.DeletionTimestamp)
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if err != nil {
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return err
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}
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if estimate > 0 {
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return &contentRemainingError{estimate}
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}
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// we have removed content, so mark it finalized by us
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result, err := retryOnConflictError(kubeClient, namespace, finalizeNamespaceFunc)
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if err != nil {
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return err
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}
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// now check if all finalizers have reported that we delete now
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if finalized(result) {
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err = kubeClient.Core().Namespaces().Delete(namespace.Name, nil)
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if err != nil && !errors.IsNotFound(err) {
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return err
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}
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}
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return nil
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}
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func deleteLimitRanges(kubeClient clientset.Interface, ns string) error {
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items, err := kubeClient.Core().LimitRanges(ns).List(api.ListOptions{})
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if err != nil {
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return err
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}
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for i := range items.Items {
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err := kubeClient.Core().LimitRanges(ns).Delete(items.Items[i].Name, nil)
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if err != nil && !errors.IsNotFound(err) {
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return err
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}
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}
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return nil
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}
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func deleteResourceQuotas(kubeClient clientset.Interface, ns string) error {
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resourceQuotas, err := kubeClient.Core().ResourceQuotas(ns).List(api.ListOptions{})
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if err != nil {
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return err
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}
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for i := range resourceQuotas.Items {
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err := kubeClient.Core().ResourceQuotas(ns).Delete(resourceQuotas.Items[i].Name, nil)
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if err != nil && !errors.IsNotFound(err) {
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return err
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}
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}
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return nil
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}
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func deleteServiceAccounts(kubeClient clientset.Interface, ns string) error {
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items, err := kubeClient.Core().ServiceAccounts(ns).List(api.ListOptions{})
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if err != nil {
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return err
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}
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for i := range items.Items {
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err := kubeClient.Core().ServiceAccounts(ns).Delete(items.Items[i].Name, nil)
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if err != nil && !errors.IsNotFound(err) {
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return err
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}
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}
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return nil
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}
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func deleteServices(kubeClient clientset.Interface, ns string) error {
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items, err := kubeClient.Core().Services(ns).List(api.ListOptions{})
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if err != nil {
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return err
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}
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for i := range items.Items {
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err := kubeClient.Core().Services(ns).Delete(items.Items[i].Name, nil)
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if err != nil && !errors.IsNotFound(err) {
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return err
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}
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}
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return nil
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}
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func deleteReplicationControllers(kubeClient clientset.Interface, ns string) error {
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items, err := kubeClient.Core().ReplicationControllers(ns).List(api.ListOptions{})
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if err != nil {
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return err
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}
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for i := range items.Items {
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err := kubeClient.Core().ReplicationControllers(ns).Delete(items.Items[i].Name, nil)
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if err != nil && !errors.IsNotFound(err) {
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return err
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}
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}
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return nil
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}
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func deletePods(kubeClient clientset.Interface, ns string, before unversioned.Time) (int64, error) {
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items, err := kubeClient.Core().Pods(ns).List(api.ListOptions{})
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if err != nil {
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return 0, err
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}
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expired := unversioned.Now().After(before.Time)
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var deleteOptions *api.DeleteOptions
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if expired {
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deleteOptions = api.NewDeleteOptions(0)
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}
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estimate := int64(0)
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for i := range items.Items {
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if items.Items[i].Spec.TerminationGracePeriodSeconds != nil {
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grace := *items.Items[i].Spec.TerminationGracePeriodSeconds
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if grace > estimate {
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estimate = grace
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func() {
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key, quit := nm.queue.Get()
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if quit {
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return
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}
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}
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err := kubeClient.Core().Pods(ns).Delete(items.Items[i].Name, deleteOptions)
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if err != nil && !errors.IsNotFound(err) {
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return 0, err
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}
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defer nm.queue.Done(key)
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if err := nm.syncNamespaceFromKey(key.(string)); err != nil {
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if estimate, ok := err.(*contentRemainingError); ok {
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go func() {
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t := estimate.Estimate/2 + 1
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glog.V(4).Infof("Content remaining in namespace %s, waiting %d seconds", key, t)
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time.Sleep(time.Duration(t) * time.Second)
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nm.queue.Add(key)
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}()
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}
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}
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}()
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}
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if expired {
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estimate = 0
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}
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return estimate, nil
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}
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func deleteEvents(kubeClient clientset.Interface, ns string) error {
|
||||
return kubeClient.Core().Events(ns).DeleteCollection(nil, api.ListOptions{})
|
||||
}
|
||||
// syncNamespaceFromKey looks for a namespace with the specified key in its store and synchronizes it
|
||||
func (nm *NamespaceController) syncNamespaceFromKey(key string) (err error) {
|
||||
startTime := time.Now()
|
||||
defer glog.V(4).Infof("Finished syncing namespace %q (%v)", key, time.Now().Sub(startTime))
|
||||
|
||||
func deleteSecrets(kubeClient clientset.Interface, ns string) error {
|
||||
items, err := kubeClient.Core().Secrets(ns).List(api.ListOptions{})
|
||||
obj, exists, err := nm.store.GetByKey(key)
|
||||
if !exists {
|
||||
glog.Infof("Namespace has been deleted %v", key)
|
||||
return nil
|
||||
}
|
||||
if err != nil {
|
||||
glog.Infof("Unable to retrieve namespace %v from store: %v", key, err)
|
||||
nm.queue.Add(key)
|
||||
return err
|
||||
}
|
||||
for i := range items.Items {
|
||||
err := kubeClient.Core().Secrets(ns).Delete(items.Items[i].Name, nil)
|
||||
if err != nil && !errors.IsNotFound(err) {
|
||||
return err
|
||||
}
|
||||
}
|
||||
return nil
|
||||
namespace := obj.(*api.Namespace)
|
||||
return syncNamespace(nm.kubeClient, nm.versions, namespace)
|
||||
}
|
||||
|
||||
func deletePersistentVolumeClaims(kubeClient clientset.Interface, ns string) error {
|
||||
items, err := kubeClient.Core().PersistentVolumeClaims(ns).List(api.ListOptions{})
|
||||
if err != nil {
|
||||
return err
|
||||
// Run starts observing the system with the specified number of workers.
|
||||
func (nm *NamespaceController) Run(workers int, stopCh <-chan struct{}) {
|
||||
defer utilruntime.HandleCrash()
|
||||
go nm.controller.Run(stopCh)
|
||||
for i := 0; i < workers; i++ {
|
||||
go wait.Until(nm.worker, time.Second, stopCh)
|
||||
}
|
||||
for i := range items.Items {
|
||||
err := kubeClient.Core().PersistentVolumeClaims(ns).Delete(items.Items[i].Name, nil)
|
||||
if err != nil && !errors.IsNotFound(err) {
|
||||
return err
|
||||
}
|
||||
}
|
||||
return nil
|
||||
}
|
||||
|
||||
func deleteHorizontalPodAutoscalers(expClient extensions_unversioned.ExtensionsInterface, ns string) error {
|
||||
items, err := expClient.HorizontalPodAutoscalers(ns).List(api.ListOptions{})
|
||||
if err != nil {
|
||||
return err
|
||||
}
|
||||
for i := range items.Items {
|
||||
err := expClient.HorizontalPodAutoscalers(ns).Delete(items.Items[i].Name, nil)
|
||||
if err != nil && !errors.IsNotFound(err) {
|
||||
return err
|
||||
}
|
||||
}
|
||||
return nil
|
||||
}
|
||||
|
||||
func deleteDaemonSets(expClient extensions_unversioned.ExtensionsInterface, ns string) error {
|
||||
items, err := expClient.DaemonSets(ns).List(api.ListOptions{})
|
||||
if err != nil {
|
||||
return err
|
||||
}
|
||||
for i := range items.Items {
|
||||
err := expClient.DaemonSets(ns).Delete(items.Items[i].Name, nil)
|
||||
if err != nil && !errors.IsNotFound(err) {
|
||||
return err
|
||||
}
|
||||
}
|
||||
return nil
|
||||
}
|
||||
|
||||
func deleteJobs(expClient extensions_unversioned.ExtensionsInterface, ns string) error {
|
||||
items, err := expClient.Jobs(ns).List(api.ListOptions{})
|
||||
if err != nil {
|
||||
return err
|
||||
}
|
||||
for i := range items.Items {
|
||||
err := expClient.Jobs(ns).Delete(items.Items[i].Name, nil)
|
||||
if err != nil && !errors.IsNotFound(err) {
|
||||
return err
|
||||
}
|
||||
}
|
||||
return nil
|
||||
}
|
||||
|
||||
func deleteDeployments(expClient extensions_unversioned.ExtensionsInterface, ns string) error {
|
||||
items, err := expClient.Deployments(ns).List(api.ListOptions{})
|
||||
if err != nil {
|
||||
return err
|
||||
}
|
||||
for i := range items.Items {
|
||||
err := expClient.Deployments(ns).Delete(items.Items[i].Name, nil)
|
||||
if err != nil && !errors.IsNotFound(err) {
|
||||
return err
|
||||
}
|
||||
}
|
||||
return nil
|
||||
}
|
||||
|
||||
func deleteIngress(expClient extensions_unversioned.ExtensionsInterface, ns string) error {
|
||||
items, err := expClient.Ingresses(ns).List(api.ListOptions{})
|
||||
if err != nil {
|
||||
return err
|
||||
}
|
||||
for i := range items.Items {
|
||||
err := expClient.Ingresses(ns).Delete(items.Items[i].Name, nil)
|
||||
if err != nil && !errors.IsNotFound(err) {
|
||||
return err
|
||||
}
|
||||
}
|
||||
return nil
|
||||
}
|
||||
|
||||
func deleteReplicaSets(expClient extensions_unversioned.ExtensionsInterface, ns string) error {
|
||||
items, err := expClient.ReplicaSets(ns).List(api.ListOptions{})
|
||||
if err != nil {
|
||||
return err
|
||||
}
|
||||
for i := range items.Items {
|
||||
err := expClient.ReplicaSets(ns).Delete(items.Items[i].Name, nil)
|
||||
if err != nil && !errors.IsNotFound(err) {
|
||||
return err
|
||||
}
|
||||
}
|
||||
return nil
|
||||
}
|
||||
|
||||
// TODO: this is duplicated logic. Move it somewhere central?
|
||||
func containsVersion(versions *unversioned.APIVersions, version string) bool {
|
||||
for ix := range versions.Versions {
|
||||
if versions.Versions[ix] == version {
|
||||
return true
|
||||
}
|
||||
}
|
||||
return false
|
||||
}
|
||||
|
||||
// TODO: this is duplicated logic. Move it somewhere central?
|
||||
func containsResource(resources *unversioned.APIResourceList, resourceName string) bool {
|
||||
if resources == nil {
|
||||
return false
|
||||
}
|
||||
for ix := range resources.APIResources {
|
||||
resource := resources.APIResources[ix]
|
||||
if resource.Name == resourceName {
|
||||
return true
|
||||
}
|
||||
}
|
||||
return false
|
||||
<-stopCh
|
||||
glog.Infof("Shutting down NamespaceController")
|
||||
nm.queue.ShutDown()
|
||||
}
|
||||
|
||||
Reference in New Issue
Block a user