/
upstream.go
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/
upstream.go
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/*
* Copyright 2021 The Multicluster-Scheduler 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 resources
import (
"context"
"fmt"
"reflect"
"regexp"
"time"
corev1 "k8s.io/api/core/v1"
metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
"k8s.io/apimachinery/pkg/labels"
"k8s.io/apimachinery/pkg/types"
"k8s.io/apimachinery/pkg/util/json"
utilruntime "k8s.io/apimachinery/pkg/util/runtime"
"k8s.io/apimachinery/pkg/util/strategicpatch"
coreinformers "k8s.io/client-go/informers/core/v1"
"k8s.io/client-go/kubernetes"
corelisters "k8s.io/client-go/listers/core/v1"
"k8s.io/kubernetes/pkg/apis/core/v1/helper"
"admiralty.io/multicluster-scheduler/pkg/common"
"admiralty.io/multicluster-scheduler/pkg/controller"
informers "admiralty.io/multicluster-scheduler/pkg/generated/informers/externalversions/multicluster/v1alpha1"
listers "admiralty.io/multicluster-scheduler/pkg/generated/listers/multicluster/v1alpha1"
"admiralty.io/multicluster-scheduler/pkg/model/virtualnode"
)
type NodeStatusUpdater interface {
UpdateNodeStatus(node *corev1.Node)
}
type upstream struct {
targetName string
kubeclientset kubernetes.Interface
nodeLister corelisters.NodeLister
clusterSummaryLister listers.ClusterSummaryLister
nodeStatusUpdater NodeStatusUpdater
excludedLabelsRegexp *regexp.Regexp
}
func NewUpstreamController(
targetName string,
kubeclientset kubernetes.Interface,
nodeInformer coreinformers.NodeInformer,
clusterSummaryInformer informers.ClusterSummaryInformer,
nodeStatusUpdater NodeStatusUpdater,
excludedLabelsRegexp *string,
) *controller.Controller {
r := &upstream{
targetName: targetName,
kubeclientset: kubeclientset,
nodeLister: nodeInformer.Lister(),
clusterSummaryLister: clusterSummaryInformer.Lister(),
nodeStatusUpdater: nodeStatusUpdater,
}
c := controller.New("cluster-resources-upstream", r, nodeInformer.Informer().HasSynced, clusterSummaryInformer.Informer().HasSynced)
// node informer doesn't use field selector on metadata.name == targetName
// because we use its cache to list other nodes to infer multi-huge-page support
// so we need to filter here
nodeInformer.Informer().AddEventHandler(controller.HandleAddUpdateWith(func(obj interface{}) {
node := obj.(*corev1.Node)
if node.Name == r.targetName {
c.EnqueueKey(node.Name)
}
}))
clusterSummaryInformer.Informer().AddEventHandler(controller.HandleAllWith(func(_ interface{}) {
c.EnqueueKey(targetName)
}))
if excludedLabelsRegexp != nil {
var err error
r.excludedLabelsRegexp, err = regexp.Compile(*excludedLabelsRegexp)
if err != nil {
// don't crash if regexp cannot be compiled
// TODO reject Target at admission
utilruntime.HandleError(fmt.Errorf("cannot compile excluded aggregated labels regexp for target %s: %v", targetName, err))
}
}
return c
}
func (r upstream) Handle(key interface{}) (requeueAfter *time.Duration, err error) {
ctx := context.Background()
targetName := key.(string)
clusterSummary, err := r.clusterSummaryLister.Get(singletonName)
if err != nil {
return nil, err
}
// if HugePageStorageMediumSize is enabled in target cluster but not in source cluster,
// virtual node status update would fail if we included multiple huge page sizes in capacity or allocatable
// in that case, we purge all page sizes (because there's no reason to keep one over the others)
// huge pages requests are still respected, thanks to our proxy-candidate scheduling algorithm
// TODO: find a good way to e2e test this, because kind inherits huge page sizes from host,
// so we can't have two kind clusters with different huge page sizes on test host.
// hack to infer HugePageStorageMediumSize Kubernetes feature flag from other nodes
sel, err := labels.Parse(common.LabelAndTaintKeyVirtualKubeletProvider + "!=" + common.VirtualKubeletProviderName)
nodes, err := r.nodeLister.List(sel)
nodesHaveMultipleHugePageSizes := false
for _, n := range nodes {
if hasMultipleHugePageSizes(n.Status.Capacity) || hasMultipleHugePageSizes(n.Status.Allocatable) {
nodesHaveMultipleHugePageSizes = true
break
}
}
clusterSummaryHasMultipleHugePageSizes := hasMultipleHugePageSizes(clusterSummary.Capacity) || hasMultipleHugePageSizes(clusterSummary.Allocatable)
if clusterSummaryHasMultipleHugePageSizes && !nodesHaveMultipleHugePageSizes {
clusterSummary = clusterSummary.DeepCopy()
purgeHugePageResources(clusterSummary.Capacity)
purgeHugePageResources(clusterSummary.Allocatable)
}
virtualNode, err := r.nodeLister.Get(targetName)
if err != nil {
return nil, err
}
l := r.reconcileLabels(clusterSummary.Labels)
// we can't group status update with label update because status update POSTs to the status subresource
// also, we use patch, not update, because for some reason EKS cloud controller deletes nodes if we use update
if !labels.Equals(virtualNode.Labels, l) {
actualCopy := virtualNode.DeepCopy()
actualCopy.Labels = l
oldData, err := json.Marshal(virtualNode)
if err != nil {
return nil, err
}
newData, err := json.Marshal(actualCopy)
if err != nil {
return nil, err
}
patchBytes, err := strategicpatch.CreateTwoWayMergePatch(oldData, newData, corev1.Node{})
if err != nil {
return nil, err
}
virtualNode, err = r.kubeclientset.CoreV1().Nodes().Patch(ctx, targetName, types.StrategicMergePatchType, patchBytes, metav1.PatchOptions{})
if err != nil {
return nil, err
}
}
if !reflect.DeepEqual(virtualNode.Status.Capacity, clusterSummary.Capacity) ||
!reflect.DeepEqual(virtualNode.Status.Allocatable, clusterSummary.Allocatable) {
actualCopy := virtualNode.DeepCopy()
actualCopy.Status.Allocatable = clusterSummary.Allocatable
actualCopy.Status.Capacity = clusterSummary.Capacity
// we use nodeStatusUpdater instead of kubeclientset because VK needs to update its internal representation
// otherwise it would override our changes
r.nodeStatusUpdater.UpdateNodeStatus(actualCopy)
// VK doesn't surface errors, so we have no way to requeue if transient error, TODO? fix upstream
}
return nil, nil
}
func (r upstream) reconcileLabels(clusterSummaryLabels map[string]string) map[string]string {
l := virtualnode.BaseLabels()
for k, v := range clusterSummaryLabels {
regExp := r.excludedLabelsRegexp
if regExp == nil || !regExp.MatchString(fmt.Sprintf("%s=%s", k, v)) {
l[k] = v
}
}
return l
}
func hasMultipleHugePageSizes(rl corev1.ResourceList) bool {
n := 0
for res, qty := range rl {
if helper.IsHugePageResourceName(res) && !qty.IsZero() {
n += 1
if n > 1 {
return true
}
}
}
return false
}
func purgeHugePageResources(rl corev1.ResourceList) {
var keys []corev1.ResourceName
for res, qty := range rl {
if helper.IsHugePageResourceName(res) && !qty.IsZero() {
keys = append(keys, res)
}
}
for _, k := range keys {
delete(rl, k)
}
}