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Merge pull request #51749 from caesarxuchao/quota-igore-uninitialized
Automatic merge from submit-queue (batch tested with PRs 49133, 51557, 51749, 50842, 52018) Charges quota only for initialized objects Partially fix https://github.com/kubernetes/kubernetes/issues/51842. Based on https://github.com/kubernetes/kubernetes/pull/51733/files. Only the commit "Don't charge quota when creating/updating an uninitialized object" is new. The old plan was to charge quota for each update of uninitialized object. This PR makes the quota admission only charges the update that removes the last pending initializer. Because * https://github.com/kubernetes/kubernetes/pull/51247, which lets sharedInformer see uninitialized objects, is not making the code freeze deadline. Hence, the quota replenishing controller won't capture deletion of uninitialized objects. We will leak quota if we charge quota for uninitialized objects. * @lavalamp @erictune pointed out calculating/reserving quota is expensive, we should avoid doing it for every initializer update. * My original argument was that quota admission should fail early so that user can easily figure out which initializer causes the quota outage. @lavalamp @erictune convinced me that user could easily figure the culprit if they watch the initialization process.
This commit is contained in:
commit
4938455b26
@ -13,6 +13,7 @@ go_library(
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tags = ["automanaged"],
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deps = [
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"//vendor/k8s.io/apimachinery/pkg/api/meta:go_default_library",
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"//vendor/k8s.io/apimachinery/pkg/util/initialization:go_default_library",
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"//vendor/k8s.io/apiserver/pkg/admission:go_default_library",
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],
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)
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|
@ -18,11 +18,12 @@ package util
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import (
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"k8s.io/apimachinery/pkg/api/meta"
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"k8s.io/apimachinery/pkg/util/initialization"
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"k8s.io/apiserver/pkg/admission"
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)
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// IsUpdatingInitializedObject returns if the operation is trying to update an
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// already initialized object.
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// IsUpdatingInitializedObject returns true if the operation is trying to update
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// an already initialized object.
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func IsUpdatingInitializedObject(a admission.Attributes) (bool, error) {
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if a.GetOperation() != admission.Update {
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return false, nil
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@ -32,14 +33,14 @@ func IsUpdatingInitializedObject(a admission.Attributes) (bool, error) {
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if err != nil {
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return false, err
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}
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if accessor.GetInitializers() == nil {
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if initialization.IsInitialized(accessor.GetInitializers()) {
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return true, nil
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}
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return false, nil
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}
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// IsUpdatingUninitializedObject returns if the operation is trying to update an
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// object that is not initialized yet.
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// IsUpdatingUninitializedObject returns true if the operation is trying to
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// update an object that is not initialized yet.
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func IsUpdatingUninitializedObject(a admission.Attributes) (bool, error) {
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if a.GetOperation() != admission.Update {
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return false, nil
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@ -49,8 +50,30 @@ func IsUpdatingUninitializedObject(a admission.Attributes) (bool, error) {
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if err != nil {
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return false, err
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}
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if accessor.GetInitializers() == nil {
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if initialization.IsInitialized(accessor.GetInitializers()) {
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return false, nil
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}
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return true, nil
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}
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// IsInitializationCompletion returns true if the operation removes all pending
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// initializers.
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func IsInitializationCompletion(a admission.Attributes) (bool, error) {
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if a.GetOperation() != admission.Update {
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return false, nil
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}
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oldObj := a.GetOldObject()
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oldInitialized, err := initialization.IsObjectInitialized(oldObj)
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if err != nil {
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return false, err
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}
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if oldInitialized {
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return false, nil
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}
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newObj := a.GetObject()
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newInitialized, err := initialization.IsObjectInitialized(newObj)
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if err != nil {
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return false, err
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}
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return newInitialized, nil
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}
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|
@ -34,9 +34,12 @@ go_library(
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"//vendor/k8s.io/apimachinery/pkg/apis/meta/v1:go_default_library",
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"//vendor/k8s.io/apimachinery/pkg/runtime:go_default_library",
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"//vendor/k8s.io/apimachinery/pkg/runtime/schema:go_default_library",
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"//vendor/k8s.io/apimachinery/pkg/util/initialization:go_default_library",
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"//vendor/k8s.io/apimachinery/pkg/util/runtime:go_default_library",
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"//vendor/k8s.io/apimachinery/pkg/util/sets:go_default_library",
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"//vendor/k8s.io/apimachinery/pkg/util/validation/field:go_default_library",
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"//vendor/k8s.io/apiserver/pkg/admission:go_default_library",
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"//vendor/k8s.io/apiserver/pkg/features:go_default_library",
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"//vendor/k8s.io/apiserver/pkg/util/feature:go_default_library",
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"//vendor/k8s.io/client-go/informers:go_default_library",
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"//vendor/k8s.io/client-go/kubernetes:go_default_library",
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|
@ -25,15 +25,18 @@ import (
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metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
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"k8s.io/apimachinery/pkg/runtime"
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"k8s.io/apimachinery/pkg/runtime/schema"
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"k8s.io/apimachinery/pkg/util/initialization"
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utilruntime "k8s.io/apimachinery/pkg/util/runtime"
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"k8s.io/apimachinery/pkg/util/sets"
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"k8s.io/apiserver/pkg/admission"
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"k8s.io/apiserver/pkg/features"
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utilfeature "k8s.io/apiserver/pkg/util/feature"
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"k8s.io/client-go/informers"
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clientset "k8s.io/client-go/kubernetes"
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"k8s.io/kubernetes/pkg/api"
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"k8s.io/kubernetes/pkg/api/helper"
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k8s_api_v1 "k8s.io/kubernetes/pkg/api/v1"
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"k8s.io/kubernetes/pkg/features"
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k8sfeatures "k8s.io/kubernetes/pkg/features"
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"k8s.io/kubernetes/pkg/kubeapiserver/admission/util"
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"k8s.io/kubernetes/pkg/quota"
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"k8s.io/kubernetes/pkg/quota/generic"
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@ -149,17 +152,26 @@ func (p *pvcEvaluator) Handles(a admission.Attributes) bool {
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if op == admission.Create {
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return true
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}
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if op == admission.Update && utilfeature.DefaultFeatureGate.Enabled(features.ExpandPersistentVolumes) {
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return true
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if op == admission.Update && utilfeature.DefaultFeatureGate.Enabled(k8sfeatures.ExpandPersistentVolumes) {
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initialized, err := initialization.IsObjectInitialized(a.GetObject())
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if err != nil {
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// fail closed, will try to give an evaluation.
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utilruntime.HandleError(err)
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return true
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}
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// only handle the update if the object is initialized after the update.
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return initialized
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}
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updateUninitialized, err := util.IsUpdatingUninitializedObject(a)
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// TODO: when the ExpandPersistentVolumes feature gate is removed, remove
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// the initializationCompletion check as well, because it will become a
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// subset of the "initialized" condition.
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initializationCompletion, err := util.IsInitializationCompletion(a)
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if err != nil {
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// fail closed, will try to give an evaluation.
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utilruntime.HandleError(err)
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return true
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}
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// only uninitialized pvc might be updated.
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return updateUninitialized
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return initializationCompletion
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}
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// Matches returns true if the evaluator matches the specified quota with the provided input item
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@ -194,10 +206,16 @@ func (p *pvcEvaluator) Usage(item runtime.Object) (api.ResourceList, error) {
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if err != nil {
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return result, err
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}
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storageClassRef := helper.GetPersistentVolumeClaimClass(pvc)
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// charge for claim
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result[api.ResourcePersistentVolumeClaims] = resource.MustParse("1")
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if utilfeature.DefaultFeatureGate.Enabled(features.Initializers) {
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if !initialization.IsInitialized(pvc.Initializers) {
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// Only charge pvc count for uninitialized pvc.
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return result, nil
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}
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}
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storageClassRef := helper.GetPersistentVolumeClaimClass(pvc)
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if len(storageClassRef) > 0 {
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storageClassClaim := api.ResourceName(storageClassRef + storageClassSuffix + string(api.ResourcePersistentVolumeClaims))
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result[storageClassClaim] = resource.MustParse("1")
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|
@ -25,9 +25,13 @@ import (
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metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
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"k8s.io/apimachinery/pkg/runtime"
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"k8s.io/apimachinery/pkg/runtime/schema"
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"k8s.io/apimachinery/pkg/util/initialization"
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utilruntime "k8s.io/apimachinery/pkg/util/runtime"
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"k8s.io/apimachinery/pkg/util/sets"
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"k8s.io/apimachinery/pkg/util/validation/field"
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"k8s.io/apiserver/pkg/admission"
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"k8s.io/apiserver/pkg/features"
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utilfeature "k8s.io/apiserver/pkg/util/feature"
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"k8s.io/client-go/informers"
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clientset "k8s.io/client-go/kubernetes"
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"k8s.io/kubernetes/pkg/api"
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@ -135,19 +139,20 @@ func (p *podEvaluator) GroupKind() schema.GroupKind {
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return api.Kind("Pod")
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}
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|
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// Handles returns true of the evaluator should handle the specified attributes.
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// Handles returns true if the evaluator should handle the specified attributes.
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func (p *podEvaluator) Handles(a admission.Attributes) bool {
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op := a.GetOperation()
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if op == admission.Create {
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return true
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}
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updateUninitialized, err := util.IsUpdatingUninitializedObject(a)
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initializationCompletion, err := util.IsInitializationCompletion(a)
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if err != nil {
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// fail closed, will try to give an evaluation.
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utilruntime.HandleError(err)
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return true
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}
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// only uninitialized pods might be updated.
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return updateUninitialized
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return initializationCompletion
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}
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|
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// Matches returns true if the evaluator matches the specified quota with the provided input item
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@ -254,10 +259,19 @@ func PodUsageFunc(obj runtime.Object) (api.ResourceList, error) {
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if err != nil {
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return api.ResourceList{}, err
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}
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|
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// by convention, we do not quota pods that have reached an end-of-life state
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if !QuotaPod(pod) {
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return api.ResourceList{}, nil
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}
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// Only charge pod count for uninitialized pod.
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if utilfeature.DefaultFeatureGate.Enabled(features.Initializers) {
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if !initialization.IsInitialized(pod.Initializers) {
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result := api.ResourceList{}
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result[api.ResourcePods] = resource.MustParse("1")
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return result, nil
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}
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}
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requests := api.ResourceList{}
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limits := api.ResourceList{}
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// TODO: fix this when we have pod level cgroups
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|
@ -80,6 +80,7 @@ filegroup(
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"//staging/src/k8s.io/apimachinery/pkg/util/errors:all-srcs",
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"//staging/src/k8s.io/apimachinery/pkg/util/framer:all-srcs",
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"//staging/src/k8s.io/apimachinery/pkg/util/httpstream:all-srcs",
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"//staging/src/k8s.io/apimachinery/pkg/util/initialization:all-srcs",
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"//staging/src/k8s.io/apimachinery/pkg/util/intstr:all-srcs",
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"//staging/src/k8s.io/apimachinery/pkg/util/json:all-srcs",
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"//staging/src/k8s.io/apimachinery/pkg/util/jsonmergepatch:all-srcs",
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|
@ -0,0 +1,26 @@
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load("@io_bazel_rules_go//go:def.bzl", "go_library")
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go_library(
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name = "go_default_library",
|
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srcs = ["initialization.go"],
|
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visibility = ["//visibility:public"],
|
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deps = [
|
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"//vendor/k8s.io/apimachinery/pkg/api/meta:go_default_library",
|
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"//vendor/k8s.io/apimachinery/pkg/apis/meta/v1:go_default_library",
|
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"//vendor/k8s.io/apimachinery/pkg/runtime:go_default_library",
|
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],
|
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)
|
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|
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filegroup(
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name = "package-srcs",
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srcs = glob(["**"]),
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tags = ["automanaged"],
|
||||
visibility = ["//visibility:private"],
|
||||
)
|
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|
||||
filegroup(
|
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name = "all-srcs",
|
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srcs = [":package-srcs"],
|
||||
tags = ["automanaged"],
|
||||
visibility = ["//visibility:public"],
|
||||
)
|
@ -0,0 +1,48 @@
|
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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 initialization
|
||||
|
||||
import (
|
||||
"k8s.io/apimachinery/pkg/api/meta"
|
||||
metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
|
||||
"k8s.io/apimachinery/pkg/runtime"
|
||||
)
|
||||
|
||||
// IsInitialized returns if the initializers indicates means initialized.
|
||||
func IsInitialized(initializers *metav1.Initializers) bool {
|
||||
if initializers == nil {
|
||||
return true
|
||||
}
|
||||
// Persisted objects will never be in this state. The initializer admission
|
||||
// plugin will override metadata.initializers to nil. If the initializer
|
||||
// admissio plugin is disabled, the generic registry always set
|
||||
// metadata.initializers to nil. However, this function
|
||||
// might be called before the object persisted, thus the check.
|
||||
if len(initializers.Pending) == 0 && initializers.Result == nil {
|
||||
return true
|
||||
}
|
||||
return false
|
||||
}
|
||||
|
||||
// IsObjectInitialized returns if the object is initialized.
|
||||
func IsObjectInitialized(obj runtime.Object) (bool, error) {
|
||||
accessor, err := meta.Accessor(obj)
|
||||
if err != nil {
|
||||
return false, err
|
||||
}
|
||||
return IsInitialized(accessor.GetInitializers()), nil
|
||||
}
|
@ -168,42 +168,45 @@ var _ = framework.KubeDescribe("ResourceQuota", func() {
|
||||
requests[v1.ResourceMemory] = resource.MustParse("252Mi")
|
||||
pod := newTestPodForQuota(f, podName, requests, v1.ResourceList{})
|
||||
pod.Initializers = &metav1.Initializers{Pending: []metav1.Initializer{{Name: "unhandled"}}}
|
||||
_, err = f.ClientSet.Core().Pods(f.Namespace.Name).Create(pod)
|
||||
pod, err = f.ClientSet.Core().Pods(f.Namespace.Name).Create(pod)
|
||||
// because no one is handling the initializer, server will return a 504 timeout
|
||||
if err != nil && !errors.IsTimeout(err) {
|
||||
framework.Failf("expect err to be timeout error, got %v", err)
|
||||
}
|
||||
podToUpdate, err := f.ClientSet.Core().Pods(f.Namespace.Name).Get(podName, metav1.GetOptions{})
|
||||
createdPod, err := f.ClientSet.Core().Pods(f.Namespace.Name).Get(podName, metav1.GetOptions{})
|
||||
Expect(err).NotTo(HaveOccurred())
|
||||
|
||||
By("Ensuring ResourceQuota status captures the pod usage")
|
||||
By("Ensuring only pod count is charged")
|
||||
usedResources = v1.ResourceList{}
|
||||
usedResources[v1.ResourceQuotas] = resource.MustParse("1")
|
||||
usedResources[v1.ResourcePods] = resource.MustParse("1")
|
||||
usedResources[v1.ResourceCPU] = requests[v1.ResourceCPU]
|
||||
usedResources[v1.ResourceMemory] = requests[v1.ResourceMemory]
|
||||
err = waitForResourceQuota(f.ClientSet, f.Namespace.Name, quotaName, usedResources)
|
||||
Expect(err).NotTo(HaveOccurred())
|
||||
|
||||
By("Not allowing an uninitialized pod to be created that exceeds remaining quota")
|
||||
requests = v1.ResourceList{}
|
||||
requests[v1.ResourceCPU] = resource.MustParse("600m")
|
||||
requests[v1.ResourceMemory] = resource.MustParse("100Mi")
|
||||
pod = newTestPodForQuota(f, "fail-pod", requests, v1.ResourceList{})
|
||||
pod.Initializers = &metav1.Initializers{Pending: []metav1.Initializer{{Name: "unhandled"}}}
|
||||
pod, err = f.ClientSet.Core().Pods(f.Namespace.Name).Create(pod)
|
||||
Expect(err).To(HaveOccurred())
|
||||
fmt.Println("CHAO: err=", err)
|
||||
|
||||
By("Ensuring an uninitialized pod can update its resource requirements")
|
||||
// a pod cannot dynamically update its resource requirements.
|
||||
requests = v1.ResourceList{}
|
||||
requests[v1.ResourceCPU] = resource.MustParse("100m")
|
||||
requests[v1.ResourceMemory] = resource.MustParse("100Mi")
|
||||
podToUpdate.Spec.Containers[0].Resources.Requests = requests
|
||||
_, err = f.ClientSet.Core().Pods(f.Namespace.Name).Update(podToUpdate)
|
||||
_, err = framework.UpdatePodWithRetries(f.ClientSet, f.Namespace.Name, createdPod.Name, func(p *v1.Pod) {
|
||||
p.Spec.Containers[0].Resources.Requests = requests
|
||||
})
|
||||
Expect(err).NotTo(HaveOccurred())
|
||||
|
||||
By("Ensuring attempts to update pod resource requirements did change quota usage")
|
||||
By("Ensuring ResourceQuota status doesn't change")
|
||||
usedResources = v1.ResourceList{}
|
||||
usedResources[v1.ResourceQuotas] = resource.MustParse("1")
|
||||
usedResources[v1.ResourcePods] = resource.MustParse("1")
|
||||
err = waitForResourceQuota(f.ClientSet, f.Namespace.Name, quotaName, usedResources)
|
||||
Expect(err).NotTo(HaveOccurred())
|
||||
|
||||
By("Allowing initializing a Pod that fits quota")
|
||||
_, err = framework.UpdatePodWithRetries(f.ClientSet, f.Namespace.Name, createdPod.Name, func(p *v1.Pod) {
|
||||
p.Initializers = nil
|
||||
})
|
||||
Expect(err).NotTo(HaveOccurred())
|
||||
|
||||
By("Ensuring ResourceQuota status captures the usage of the intialized pod")
|
||||
usedResources[v1.ResourceQuotas] = resource.MustParse("1")
|
||||
usedResources[v1.ResourcePods] = resource.MustParse("1")
|
||||
usedResources[v1.ResourceCPU] = requests[v1.ResourceCPU]
|
||||
@ -211,20 +214,64 @@ var _ = framework.KubeDescribe("ResourceQuota", func() {
|
||||
err = waitForResourceQuota(f.ClientSet, f.Namespace.Name, quotaName, usedResources)
|
||||
Expect(err).NotTo(HaveOccurred())
|
||||
|
||||
// TODO: uncomment the test after 51247 is merged, in which the
|
||||
// replenishment_controller uses the sharedInformer that list/watches
|
||||
// uninitialized objects.
|
||||
// By("Deleting the pod")
|
||||
// err = f.ClientSet.Core().Pods(f.Namespace.Name).Delete(podName, metav1.NewDeleteOptions(0))
|
||||
// Expect(err).NotTo(HaveOccurred())
|
||||
//
|
||||
// By("Ensuring resource quota status released the pod usage")
|
||||
// usedResources[v1.ResourceQuotas] = resource.MustParse("1")
|
||||
// usedResources[v1.ResourcePods] = resource.MustParse("0")
|
||||
// usedResources[v1.ResourceCPU] = resource.MustParse("0")
|
||||
// usedResources[v1.ResourceMemory] = resource.MustParse("0")
|
||||
// err = waitForResourceQuota(f.ClientSet, f.Namespace.Name, quotaName, usedResources)
|
||||
// Expect(err).NotTo(HaveOccurred())
|
||||
By("Deleting the pod")
|
||||
err = f.ClientSet.Core().Pods(f.Namespace.Name).Delete(createdPod.Name, metav1.NewDeleteOptions(0))
|
||||
Expect(err).NotTo(HaveOccurred())
|
||||
|
||||
By("Ensuring resource quota status released the pod usage")
|
||||
usedResources[v1.ResourceQuotas] = resource.MustParse("1")
|
||||
usedResources[v1.ResourcePods] = resource.MustParse("0")
|
||||
usedResources[v1.ResourceCPU] = resource.MustParse("0")
|
||||
usedResources[v1.ResourceMemory] = resource.MustParse("0")
|
||||
err = waitForResourceQuota(f.ClientSet, f.Namespace.Name, quotaName, usedResources)
|
||||
Expect(err).NotTo(HaveOccurred())
|
||||
|
||||
By("Allowing creating an uninitialized pod that exceeds remaining quota")
|
||||
requests = v1.ResourceList{}
|
||||
requests[v1.ResourceCPU] = resource.MustParse("1100m")
|
||||
requests[v1.ResourceMemory] = resource.MustParse("100Mi")
|
||||
podName = "too-large-pod"
|
||||
pod = newTestPodForQuota(f, podName, requests, v1.ResourceList{})
|
||||
pod.Initializers = &metav1.Initializers{Pending: []metav1.Initializer{{Name: "unhandled"}}}
|
||||
_, err = f.ClientSet.Core().Pods(f.Namespace.Name).Create(pod)
|
||||
// because no one is handling the initializer, server will return a 504 timeout
|
||||
if err != nil && !errors.IsTimeout(err) {
|
||||
framework.Failf("expect err to be timeout error, got %v", err)
|
||||
}
|
||||
createdPod, err = f.ClientSet.Core().Pods(f.Namespace.Name).Get(podName, metav1.GetOptions{})
|
||||
Expect(err).NotTo(HaveOccurred())
|
||||
|
||||
By("Ensuring only charges pod count")
|
||||
usedResources = v1.ResourceList{}
|
||||
usedResources[v1.ResourceQuotas] = resource.MustParse("1")
|
||||
usedResources[v1.ResourcePods] = resource.MustParse("1")
|
||||
err = waitForResourceQuota(f.ClientSet, f.Namespace.Name, quotaName, usedResources)
|
||||
Expect(err).NotTo(HaveOccurred())
|
||||
|
||||
By("Disallowing initializing a Pod that doesn't fit quota")
|
||||
_, err = framework.UpdatePodWithRetries(f.ClientSet, f.Namespace.Name, createdPod.Name, func(p *v1.Pod) {
|
||||
p.Initializers = nil
|
||||
})
|
||||
Expect(err).To(HaveOccurred())
|
||||
|
||||
By("Ensuring ResourceQuota status doesn't change")
|
||||
usedResources = v1.ResourceList{}
|
||||
usedResources[v1.ResourceQuotas] = resource.MustParse("1")
|
||||
usedResources[v1.ResourcePods] = resource.MustParse("1")
|
||||
err = waitForResourceQuota(f.ClientSet, f.Namespace.Name, quotaName, usedResources)
|
||||
Expect(err).NotTo(HaveOccurred())
|
||||
|
||||
By("Deleting the pod")
|
||||
err = f.ClientSet.Core().Pods(f.Namespace.Name).Delete(createdPod.Name, metav1.NewDeleteOptions(0))
|
||||
Expect(err).NotTo(HaveOccurred())
|
||||
|
||||
By("Ensuring ResourceQuota status doesn't change")
|
||||
usedResources = v1.ResourceList{}
|
||||
usedResources[v1.ResourceQuotas] = resource.MustParse("1")
|
||||
// TODO: This is a bug. We need 51247 to fix it.
|
||||
usedResources[v1.ResourcePods] = resource.MustParse("1")
|
||||
err = waitForResourceQuota(f.ClientSet, f.Namespace.Name, quotaName, usedResources)
|
||||
Expect(err).NotTo(HaveOccurred())
|
||||
})
|
||||
|
||||
It("should create a ResourceQuota and capture the life of a pod.", func() {
|
||||
|
Loading…
Reference in New Issue
Block a user