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feat: Implement distributed snapshotting

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2021-12-24 19:57:49 +00:00
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/*
Copyright 2020 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 corev1 defines functions which should satisfy one of the following:
//
// - Be used by more than one core component (kube-scheduler, kubelet, kube-apiserver, etc.)
// - Be used by a core component and another kubernetes project (cluster-autoscaler, descheduler)
//
// And be a scheduling feature.
package corev1 // import "k8s.io/component-helpers/scheduling/corev1"

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/*
Copyright 2020 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 corev1
import (
"encoding/json"
v1 "k8s.io/api/core/v1"
"k8s.io/component-helpers/scheduling/corev1/nodeaffinity"
)
// PodPriority returns priority of the given pod.
func PodPriority(pod *v1.Pod) int32 {
if pod.Spec.Priority != nil {
return *pod.Spec.Priority
}
// When priority of a running pod is nil, it means it was created at a time
// that there was no global default priority class and the priority class
// name of the pod was empty. So, we resolve to the static default priority.
return 0
}
// MatchNodeSelectorTerms checks whether the node labels and fields match node selector terms in ORed;
// nil or empty term matches no objects.
func MatchNodeSelectorTerms(
node *v1.Node,
nodeSelector *v1.NodeSelector,
) (bool, error) {
if node == nil {
return false, nil
}
return nodeaffinity.NewLazyErrorNodeSelector(nodeSelector).Match(node)
}
// GetAvoidPodsFromNodeAnnotations scans the list of annotations and
// returns the pods that needs to be avoided for this node from scheduling
func GetAvoidPodsFromNodeAnnotations(annotations map[string]string) (v1.AvoidPods, error) {
var avoidPods v1.AvoidPods
if len(annotations) > 0 && annotations[v1.PreferAvoidPodsAnnotationKey] != "" {
err := json.Unmarshal([]byte(annotations[v1.PreferAvoidPodsAnnotationKey]), &avoidPods)
if err != nil {
return avoidPods, err
}
}
return avoidPods, nil
}
// TolerationsTolerateTaint checks if taint is tolerated by any of the tolerations.
func TolerationsTolerateTaint(tolerations []v1.Toleration, taint *v1.Taint) bool {
for i := range tolerations {
if tolerations[i].ToleratesTaint(taint) {
return true
}
}
return false
}
type taintsFilterFunc func(*v1.Taint) bool
// FindMatchingUntoleratedTaint checks if the given tolerations tolerates
// all the filtered taints, and returns the first taint without a toleration
// Returns true if there is an untolerated taint
// Returns false if all taints are tolerated
func FindMatchingUntoleratedTaint(taints []v1.Taint, tolerations []v1.Toleration, inclusionFilter taintsFilterFunc) (v1.Taint, bool) {
filteredTaints := getFilteredTaints(taints, inclusionFilter)
for _, taint := range filteredTaints {
if !TolerationsTolerateTaint(tolerations, &taint) {
return taint, true
}
}
return v1.Taint{}, false
}
// getFilteredTaints returns a list of taints satisfying the filter predicate
func getFilteredTaints(taints []v1.Taint, inclusionFilter taintsFilterFunc) []v1.Taint {
if inclusionFilter == nil {
return taints
}
filteredTaints := []v1.Taint{}
for _, taint := range taints {
if !inclusionFilter(&taint) {
continue
}
filteredTaints = append(filteredTaints, taint)
}
return filteredTaints
}

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/*
Copyright 2020 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 nodeaffinity
import (
v1 "k8s.io/api/core/v1"
"k8s.io/apimachinery/pkg/fields"
"k8s.io/apimachinery/pkg/labels"
"k8s.io/apimachinery/pkg/selection"
"k8s.io/apimachinery/pkg/util/errors"
"k8s.io/apimachinery/pkg/util/validation/field"
)
// NodeSelector is a runtime representation of v1.NodeSelector.
type NodeSelector struct {
lazy LazyErrorNodeSelector
}
// LazyErrorNodeSelector is a runtime representation of v1.NodeSelector that
// only reports parse errors when no terms match.
type LazyErrorNodeSelector struct {
terms []nodeSelectorTerm
}
// NewNodeSelector returns a NodeSelector or aggregate parsing errors found.
func NewNodeSelector(ns *v1.NodeSelector, opts ...field.PathOption) (*NodeSelector, error) {
lazy := NewLazyErrorNodeSelector(ns, opts...)
var errs []error
for _, term := range lazy.terms {
if len(term.parseErrs) > 0 {
errs = append(errs, term.parseErrs...)
}
}
if len(errs) != 0 {
return nil, errors.Flatten(errors.NewAggregate(errs))
}
return &NodeSelector{lazy: *lazy}, nil
}
// NewLazyErrorNodeSelector creates a NodeSelector that only reports parse
// errors when no terms match.
func NewLazyErrorNodeSelector(ns *v1.NodeSelector, opts ...field.PathOption) *LazyErrorNodeSelector {
p := field.ToPath(opts...)
parsedTerms := make([]nodeSelectorTerm, 0, len(ns.NodeSelectorTerms))
path := p.Child("nodeSelectorTerms")
for i, term := range ns.NodeSelectorTerms {
// nil or empty term selects no objects
if isEmptyNodeSelectorTerm(&term) {
continue
}
p := path.Index(i)
parsedTerms = append(parsedTerms, newNodeSelectorTerm(&term, p))
}
return &LazyErrorNodeSelector{
terms: parsedTerms,
}
}
// Match checks whether the node labels and fields match the selector terms, ORed;
// nil or empty term matches no objects.
func (ns *NodeSelector) Match(node *v1.Node) bool {
// parse errors are reported in NewNodeSelector.
match, _ := ns.lazy.Match(node)
return match
}
// Match checks whether the node labels and fields match the selector terms, ORed;
// nil or empty term matches no objects.
// Parse errors are only returned if no terms matched.
func (ns *LazyErrorNodeSelector) Match(node *v1.Node) (bool, error) {
if node == nil {
return false, nil
}
nodeLabels := labels.Set(node.Labels)
nodeFields := extractNodeFields(node)
var errs []error
for _, term := range ns.terms {
match, tErrs := term.match(nodeLabels, nodeFields)
if len(tErrs) > 0 {
errs = append(errs, tErrs...)
continue
}
if match {
return true, nil
}
}
return false, errors.Flatten(errors.NewAggregate(errs))
}
// PreferredSchedulingTerms is a runtime representation of []v1.PreferredSchedulingTerms.
type PreferredSchedulingTerms struct {
terms []preferredSchedulingTerm
}
// NewPreferredSchedulingTerms returns a PreferredSchedulingTerms or all the parsing errors found.
// If a v1.PreferredSchedulingTerm has a 0 weight, its parsing is skipped.
func NewPreferredSchedulingTerms(terms []v1.PreferredSchedulingTerm, opts ...field.PathOption) (*PreferredSchedulingTerms, error) {
p := field.ToPath(opts...)
var errs []error
parsedTerms := make([]preferredSchedulingTerm, 0, len(terms))
for i, term := range terms {
path := p.Index(i)
if term.Weight == 0 || isEmptyNodeSelectorTerm(&term.Preference) {
continue
}
parsedTerm := preferredSchedulingTerm{
nodeSelectorTerm: newNodeSelectorTerm(&term.Preference, path),
weight: int(term.Weight),
}
if len(parsedTerm.parseErrs) > 0 {
errs = append(errs, parsedTerm.parseErrs...)
} else {
parsedTerms = append(parsedTerms, parsedTerm)
}
}
if len(errs) != 0 {
return nil, errors.Flatten(errors.NewAggregate(errs))
}
return &PreferredSchedulingTerms{terms: parsedTerms}, nil
}
// Score returns a score for a Node: the sum of the weights of the terms that
// match the Node.
func (t *PreferredSchedulingTerms) Score(node *v1.Node) int64 {
var score int64
nodeLabels := labels.Set(node.Labels)
nodeFields := extractNodeFields(node)
for _, term := range t.terms {
// parse errors are reported in NewPreferredSchedulingTerms.
if ok, _ := term.match(nodeLabels, nodeFields); ok {
score += int64(term.weight)
}
}
return score
}
func isEmptyNodeSelectorTerm(term *v1.NodeSelectorTerm) bool {
return len(term.MatchExpressions) == 0 && len(term.MatchFields) == 0
}
func extractNodeFields(n *v1.Node) fields.Set {
f := make(fields.Set)
if len(n.Name) > 0 {
f["metadata.name"] = n.Name
}
return f
}
type nodeSelectorTerm struct {
matchLabels labels.Selector
matchFields fields.Selector
parseErrs []error
}
func newNodeSelectorTerm(term *v1.NodeSelectorTerm, path *field.Path) nodeSelectorTerm {
var parsedTerm nodeSelectorTerm
var errs []error
if len(term.MatchExpressions) != 0 {
p := path.Child("matchExpressions")
parsedTerm.matchLabels, errs = nodeSelectorRequirementsAsSelector(term.MatchExpressions, p)
if errs != nil {
parsedTerm.parseErrs = append(parsedTerm.parseErrs, errs...)
}
}
if len(term.MatchFields) != 0 {
p := path.Child("matchFields")
parsedTerm.matchFields, errs = nodeSelectorRequirementsAsFieldSelector(term.MatchFields, p)
if errs != nil {
parsedTerm.parseErrs = append(parsedTerm.parseErrs, errs...)
}
}
return parsedTerm
}
func (t *nodeSelectorTerm) match(nodeLabels labels.Set, nodeFields fields.Set) (bool, []error) {
if t.parseErrs != nil {
return false, t.parseErrs
}
if t.matchLabels != nil && !t.matchLabels.Matches(nodeLabels) {
return false, nil
}
if t.matchFields != nil && len(nodeFields) > 0 && !t.matchFields.Matches(nodeFields) {
return false, nil
}
return true, nil
}
// nodeSelectorRequirementsAsSelector converts the []NodeSelectorRequirement api type into a struct that implements
// labels.Selector.
func nodeSelectorRequirementsAsSelector(nsm []v1.NodeSelectorRequirement, path *field.Path) (labels.Selector, []error) {
if len(nsm) == 0 {
return labels.Nothing(), nil
}
var errs []error
selector := labels.NewSelector()
for i, expr := range nsm {
p := path.Index(i)
var op selection.Operator
switch expr.Operator {
case v1.NodeSelectorOpIn:
op = selection.In
case v1.NodeSelectorOpNotIn:
op = selection.NotIn
case v1.NodeSelectorOpExists:
op = selection.Exists
case v1.NodeSelectorOpDoesNotExist:
op = selection.DoesNotExist
case v1.NodeSelectorOpGt:
op = selection.GreaterThan
case v1.NodeSelectorOpLt:
op = selection.LessThan
default:
errs = append(errs, field.NotSupported(p.Child("operator"), expr.Operator, nil))
continue
}
r, err := labels.NewRequirement(expr.Key, op, expr.Values, field.WithPath(p))
if err != nil {
errs = append(errs, err)
} else {
selector = selector.Add(*r)
}
}
if len(errs) != 0 {
return nil, errs
}
return selector, nil
}
var validFieldSelectorOperators = []string{
string(v1.NodeSelectorOpIn),
string(v1.NodeSelectorOpNotIn),
}
// nodeSelectorRequirementsAsFieldSelector converts the []NodeSelectorRequirement core type into a struct that implements
// fields.Selector.
func nodeSelectorRequirementsAsFieldSelector(nsr []v1.NodeSelectorRequirement, path *field.Path) (fields.Selector, []error) {
if len(nsr) == 0 {
return fields.Nothing(), nil
}
var errs []error
var selectors []fields.Selector
for i, expr := range nsr {
p := path.Index(i)
switch expr.Operator {
case v1.NodeSelectorOpIn:
if len(expr.Values) != 1 {
errs = append(errs, field.Invalid(p.Child("values"), expr.Values, "must have one element"))
} else {
selectors = append(selectors, fields.OneTermEqualSelector(expr.Key, expr.Values[0]))
}
case v1.NodeSelectorOpNotIn:
if len(expr.Values) != 1 {
errs = append(errs, field.Invalid(p.Child("values"), expr.Values, "must have one element"))
} else {
selectors = append(selectors, fields.OneTermNotEqualSelector(expr.Key, expr.Values[0]))
}
default:
errs = append(errs, field.NotSupported(p.Child("operator"), expr.Operator, validFieldSelectorOperators))
}
}
if len(errs) != 0 {
return nil, errs
}
return fields.AndSelectors(selectors...), nil
}
type preferredSchedulingTerm struct {
nodeSelectorTerm
weight int
}
type RequiredNodeAffinity struct {
labelSelector labels.Selector
nodeSelector *LazyErrorNodeSelector
}
// GetRequiredNodeAffinity returns the parsing result of pod's nodeSelector and nodeAffinity.
func GetRequiredNodeAffinity(pod *v1.Pod) RequiredNodeAffinity {
var selector labels.Selector
if len(pod.Spec.NodeSelector) > 0 {
selector = labels.SelectorFromSet(pod.Spec.NodeSelector)
}
// Use LazyErrorNodeSelector for backwards compatibility of parsing errors.
var affinity *LazyErrorNodeSelector
if pod.Spec.Affinity != nil &&
pod.Spec.Affinity.NodeAffinity != nil &&
pod.Spec.Affinity.NodeAffinity.RequiredDuringSchedulingIgnoredDuringExecution != nil {
affinity = NewLazyErrorNodeSelector(pod.Spec.Affinity.NodeAffinity.RequiredDuringSchedulingIgnoredDuringExecution)
}
return RequiredNodeAffinity{labelSelector: selector, nodeSelector: affinity}
}
// Match checks whether the pod is schedulable onto nodes according to
// the requirements in both nodeSelector and nodeAffinity.
func (s RequiredNodeAffinity) Match(node *v1.Node) (bool, error) {
if s.labelSelector != nil {
if !s.labelSelector.Matches(labels.Set(node.Labels)) {
return false, nil
}
}
if s.nodeSelector != nil {
return s.nodeSelector.Match(node)
}
return true, nil
}