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framework.go
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framework.go
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/*
Copyright 2019 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 runtime
import (
"context"
"errors"
"fmt"
"io"
"reflect"
"sort"
"time"
v1 "k8s.io/api/core/v1"
"k8s.io/apimachinery/pkg/runtime"
"k8s.io/apimachinery/pkg/types"
"k8s.io/apimachinery/pkg/util/sets"
"k8s.io/client-go/informers"
clientset "k8s.io/client-go/kubernetes"
restclient "k8s.io/client-go/rest"
"k8s.io/client-go/tools/events"
"k8s.io/component-helpers/scheduling/corev1"
"k8s.io/klog/v2"
"k8s.io/kubernetes/pkg/scheduler/apis/config"
"k8s.io/kubernetes/pkg/scheduler/framework"
"k8s.io/kubernetes/pkg/scheduler/framework/parallelize"
"k8s.io/kubernetes/pkg/scheduler/metrics"
"k8s.io/kubernetes/pkg/util/slice"
)
const (
// Specifies the maximum timeout a permit plugin can return.
maxTimeout = 15 * time.Minute
)
// frameworkImpl is the component responsible for initializing and running scheduler
// plugins.
type frameworkImpl struct {
registry Registry
snapshotSharedLister framework.SharedLister
waitingPods *waitingPodsMap
scorePluginWeight map[string]int
preEnqueuePlugins []framework.PreEnqueuePlugin
enqueueExtensions []framework.EnqueueExtensions
queueSortPlugins []framework.QueueSortPlugin
preFilterPlugins []framework.PreFilterPlugin
filterPlugins []framework.FilterPlugin
postFilterPlugins []framework.PostFilterPlugin
preScorePlugins []framework.PreScorePlugin
scorePlugins []framework.ScorePlugin
reservePlugins []framework.ReservePlugin
preBindPlugins []framework.PreBindPlugin
bindPlugins []framework.BindPlugin
postBindPlugins []framework.PostBindPlugin
permitPlugins []framework.PermitPlugin
// pluginsMap contains all plugins, by name.
pluginsMap map[string]framework.Plugin
clientSet clientset.Interface
kubeConfig *restclient.Config
eventRecorder events.EventRecorder
informerFactory informers.SharedInformerFactory
logger klog.Logger
metricsRecorder *metrics.MetricAsyncRecorder
profileName string
percentageOfNodesToScore *int32
extenders []framework.Extender
framework.PodNominator
parallelizer parallelize.Parallelizer
}
// extensionPoint encapsulates desired and applied set of plugins at a specific extension
// point. This is used to simplify iterating over all extension points supported by the
// frameworkImpl.
type extensionPoint struct {
// the set of plugins to be configured at this extension point.
plugins *config.PluginSet
// a pointer to the slice storing plugins implementations that will run at this
// extension point.
slicePtr interface{}
}
func (f *frameworkImpl) getExtensionPoints(plugins *config.Plugins) []extensionPoint {
return []extensionPoint{
{&plugins.PreFilter, &f.preFilterPlugins},
{&plugins.Filter, &f.filterPlugins},
{&plugins.PostFilter, &f.postFilterPlugins},
{&plugins.Reserve, &f.reservePlugins},
{&plugins.PreScore, &f.preScorePlugins},
{&plugins.Score, &f.scorePlugins},
{&plugins.PreBind, &f.preBindPlugins},
{&plugins.Bind, &f.bindPlugins},
{&plugins.PostBind, &f.postBindPlugins},
{&plugins.Permit, &f.permitPlugins},
{&plugins.PreEnqueue, &f.preEnqueuePlugins},
{&plugins.QueueSort, &f.queueSortPlugins},
}
}
// Extenders returns the registered extenders.
func (f *frameworkImpl) Extenders() []framework.Extender {
return f.extenders
}
type frameworkOptions struct {
componentConfigVersion string
clientSet clientset.Interface
kubeConfig *restclient.Config
eventRecorder events.EventRecorder
informerFactory informers.SharedInformerFactory
snapshotSharedLister framework.SharedLister
metricsRecorder *metrics.MetricAsyncRecorder
podNominator framework.PodNominator
extenders []framework.Extender
captureProfile CaptureProfile
parallelizer parallelize.Parallelizer
logger *klog.Logger
}
// Option for the frameworkImpl.
type Option func(*frameworkOptions)
// WithComponentConfigVersion sets the component config version to the
// KubeSchedulerConfiguration version used. The string should be the full
// scheme group/version of the external type we converted from (for example
// "kubescheduler.config.k8s.io/v1")
func WithComponentConfigVersion(componentConfigVersion string) Option {
return func(o *frameworkOptions) {
o.componentConfigVersion = componentConfigVersion
}
}
// WithClientSet sets clientSet for the scheduling frameworkImpl.
func WithClientSet(clientSet clientset.Interface) Option {
return func(o *frameworkOptions) {
o.clientSet = clientSet
}
}
// WithKubeConfig sets kubeConfig for the scheduling frameworkImpl.
func WithKubeConfig(kubeConfig *restclient.Config) Option {
return func(o *frameworkOptions) {
o.kubeConfig = kubeConfig
}
}
// WithEventRecorder sets clientSet for the scheduling frameworkImpl.
func WithEventRecorder(recorder events.EventRecorder) Option {
return func(o *frameworkOptions) {
o.eventRecorder = recorder
}
}
// WithInformerFactory sets informer factory for the scheduling frameworkImpl.
func WithInformerFactory(informerFactory informers.SharedInformerFactory) Option {
return func(o *frameworkOptions) {
o.informerFactory = informerFactory
}
}
// WithSnapshotSharedLister sets the SharedLister of the snapshot.
func WithSnapshotSharedLister(snapshotSharedLister framework.SharedLister) Option {
return func(o *frameworkOptions) {
o.snapshotSharedLister = snapshotSharedLister
}
}
// WithPodNominator sets podNominator for the scheduling frameworkImpl.
func WithPodNominator(nominator framework.PodNominator) Option {
return func(o *frameworkOptions) {
o.podNominator = nominator
}
}
// WithExtenders sets extenders for the scheduling frameworkImpl.
func WithExtenders(extenders []framework.Extender) Option {
return func(o *frameworkOptions) {
o.extenders = extenders
}
}
// WithParallelism sets parallelism for the scheduling frameworkImpl.
func WithParallelism(parallelism int) Option {
return func(o *frameworkOptions) {
o.parallelizer = parallelize.NewParallelizer(parallelism)
}
}
// CaptureProfile is a callback to capture a finalized profile.
type CaptureProfile func(config.KubeSchedulerProfile)
// WithCaptureProfile sets a callback to capture the finalized profile.
func WithCaptureProfile(c CaptureProfile) Option {
return func(o *frameworkOptions) {
o.captureProfile = c
}
}
// WithMetricsRecorder sets metrics recorder for the scheduling frameworkImpl.
func WithMetricsRecorder(r *metrics.MetricAsyncRecorder) Option {
return func(o *frameworkOptions) {
o.metricsRecorder = r
}
}
// WithLogger overrides the default logger from k8s.io/klog.
func WithLogger(logger klog.Logger) Option {
return func(o *frameworkOptions) {
o.logger = &logger
}
}
// defaultFrameworkOptions are applied when no option corresponding to those fields exist.
func defaultFrameworkOptions(stopCh <-chan struct{}) frameworkOptions {
return frameworkOptions{
metricsRecorder: metrics.NewMetricsAsyncRecorder(1000, time.Second, stopCh),
parallelizer: parallelize.NewParallelizer(parallelize.DefaultParallelism),
}
}
var _ framework.Framework = &frameworkImpl{}
// NewFramework initializes plugins given the configuration and the registry.
func NewFramework(ctx context.Context, r Registry, profile *config.KubeSchedulerProfile, opts ...Option) (framework.Framework, error) {
options := defaultFrameworkOptions(ctx.Done())
for _, opt := range opts {
opt(&options)
}
logger := klog.FromContext(ctx)
if options.logger != nil {
logger = *options.logger
}
f := &frameworkImpl{
registry: r,
snapshotSharedLister: options.snapshotSharedLister,
scorePluginWeight: make(map[string]int),
waitingPods: newWaitingPodsMap(),
clientSet: options.clientSet,
kubeConfig: options.kubeConfig,
eventRecorder: options.eventRecorder,
informerFactory: options.informerFactory,
metricsRecorder: options.metricsRecorder,
extenders: options.extenders,
PodNominator: options.podNominator,
parallelizer: options.parallelizer,
logger: logger,
}
if len(f.extenders) > 0 {
// Extender doesn't support any kind of requeueing feature like EnqueueExtensions in the scheduling framework.
// We register a defaultEnqueueExtension to framework.ExtenderName here.
// And, in the scheduling cycle, when Extenders reject some Nodes and the pod ends up being unschedulable,
// we put framework.ExtenderName to pInfo.UnschedulablePlugins.
f.enqueueExtensions = []framework.EnqueueExtensions{&defaultEnqueueExtension{pluginName: framework.ExtenderName}}
}
if profile == nil {
return f, nil
}
f.profileName = profile.SchedulerName
f.percentageOfNodesToScore = profile.PercentageOfNodesToScore
if profile.Plugins == nil {
return f, nil
}
// get needed plugins from config
pg := f.pluginsNeeded(profile.Plugins)
pluginConfig := make(map[string]runtime.Object, len(profile.PluginConfig))
for i := range profile.PluginConfig {
name := profile.PluginConfig[i].Name
if _, ok := pluginConfig[name]; ok {
return nil, fmt.Errorf("repeated config for plugin %s", name)
}
pluginConfig[name] = profile.PluginConfig[i].Args
}
outputProfile := config.KubeSchedulerProfile{
SchedulerName: f.profileName,
PercentageOfNodesToScore: f.percentageOfNodesToScore,
Plugins: profile.Plugins,
PluginConfig: make([]config.PluginConfig, 0, len(pg)),
}
f.pluginsMap = make(map[string]framework.Plugin)
for name, factory := range r {
// initialize only needed plugins.
if !pg.Has(name) {
continue
}
args := pluginConfig[name]
if args != nil {
outputProfile.PluginConfig = append(outputProfile.PluginConfig, config.PluginConfig{
Name: name,
Args: args,
})
}
p, err := factory(ctx, args, f)
if err != nil {
return nil, fmt.Errorf("initializing plugin %q: %w", name, err)
}
f.pluginsMap[name] = p
f.fillEnqueueExtensions(p)
}
// initialize plugins per individual extension points
for _, e := range f.getExtensionPoints(profile.Plugins) {
if err := updatePluginList(e.slicePtr, *e.plugins, f.pluginsMap); err != nil {
return nil, err
}
}
// initialize multiPoint plugins to their expanded extension points
if len(profile.Plugins.MultiPoint.Enabled) > 0 {
if err := f.expandMultiPointPlugins(logger, profile); err != nil {
return nil, err
}
}
if len(f.queueSortPlugins) != 1 {
return nil, fmt.Errorf("only one queue sort plugin required for profile with scheduler name %q, but got %d", profile.SchedulerName, len(f.queueSortPlugins))
}
if len(f.bindPlugins) == 0 {
return nil, fmt.Errorf("at least one bind plugin is needed for profile with scheduler name %q", profile.SchedulerName)
}
if err := getScoreWeights(f, append(profile.Plugins.Score.Enabled, profile.Plugins.MultiPoint.Enabled...)); err != nil {
return nil, err
}
// Verifying the score weights again since Plugin.Name() could return a different
// value from the one used in the configuration.
for _, scorePlugin := range f.scorePlugins {
if f.scorePluginWeight[scorePlugin.Name()] == 0 {
return nil, fmt.Errorf("score plugin %q is not configured with weight", scorePlugin.Name())
}
}
if options.captureProfile != nil {
if len(outputProfile.PluginConfig) != 0 {
sort.Slice(outputProfile.PluginConfig, func(i, j int) bool {
return outputProfile.PluginConfig[i].Name < outputProfile.PluginConfig[j].Name
})
} else {
outputProfile.PluginConfig = nil
}
options.captureProfile(outputProfile)
}
// Logs Enabled Plugins at each extension point, taking default plugins, given config, and multipoint into consideration
logger.V(2).Info("the scheduler starts to work with those plugins", "Plugins", *f.ListPlugins())
f.setInstrumentedPlugins()
return f, nil
}
// setInstrumentedPlugins initializes instrumented plugins from current plugins that frameworkImpl has.
func (f *frameworkImpl) setInstrumentedPlugins() {
// Cache metric streams for prefilter and filter plugins.
for i, pl := range f.preFilterPlugins {
f.preFilterPlugins[i] = &instrumentedPreFilterPlugin{
PreFilterPlugin: f.preFilterPlugins[i],
metric: metrics.PluginEvaluationTotal.WithLabelValues(pl.Name(), metrics.PreFilter, f.profileName),
}
}
for i, pl := range f.filterPlugins {
f.filterPlugins[i] = &instrumentedFilterPlugin{
FilterPlugin: f.filterPlugins[i],
metric: metrics.PluginEvaluationTotal.WithLabelValues(pl.Name(), metrics.Filter, f.profileName),
}
}
// Cache metric streams for prescore and score plugins.
for i, pl := range f.preScorePlugins {
f.preScorePlugins[i] = &instrumentedPreScorePlugin{
PreScorePlugin: f.preScorePlugins[i],
metric: metrics.PluginEvaluationTotal.WithLabelValues(pl.Name(), metrics.PreScore, f.profileName),
}
}
for i, pl := range f.scorePlugins {
f.scorePlugins[i] = &instrumentedScorePlugin{
ScorePlugin: f.scorePlugins[i],
metric: metrics.PluginEvaluationTotal.WithLabelValues(pl.Name(), metrics.Score, f.profileName),
}
}
}
func (f *frameworkImpl) SetPodNominator(n framework.PodNominator) {
f.PodNominator = n
}
// Close closes each plugin, when they implement io.Closer interface.
func (f *frameworkImpl) Close() error {
var errs []error
for name, plugin := range f.pluginsMap {
if closer, ok := plugin.(io.Closer); ok {
err := closer.Close()
if err != nil {
errs = append(errs, fmt.Errorf("%s failed to close: %w", name, err))
// We try to close all plugins even if we got errors from some.
}
}
}
return errors.Join(errs...)
}
// getScoreWeights makes sure that, between MultiPoint-Score plugin weights and individual Score
// plugin weights there is not an overflow of MaxTotalScore.
func getScoreWeights(f *frameworkImpl, plugins []config.Plugin) error {
var totalPriority int64
scorePlugins := reflect.ValueOf(&f.scorePlugins).Elem()
pluginType := scorePlugins.Type().Elem()
for _, e := range plugins {
pg := f.pluginsMap[e.Name]
if !reflect.TypeOf(pg).Implements(pluginType) {
continue
}
// We append MultiPoint plugins to the list of Score plugins. So if this plugin has already been
// encountered, let the individual Score weight take precedence.
if _, ok := f.scorePluginWeight[e.Name]; ok {
continue
}
// a weight of zero is not permitted, plugins can be disabled explicitly
// when configured.
f.scorePluginWeight[e.Name] = int(e.Weight)
if f.scorePluginWeight[e.Name] == 0 {
f.scorePluginWeight[e.Name] = 1
}
// Checks totalPriority against MaxTotalScore to avoid overflow
if int64(f.scorePluginWeight[e.Name])*framework.MaxNodeScore > framework.MaxTotalScore-totalPriority {
return fmt.Errorf("total score of Score plugins could overflow")
}
totalPriority += int64(f.scorePluginWeight[e.Name]) * framework.MaxNodeScore
}
return nil
}
type orderedSet struct {
set map[string]int
list []string
deletionCnt int
}
func newOrderedSet() *orderedSet {
return &orderedSet{set: make(map[string]int)}
}
func (os *orderedSet) insert(s string) {
if os.has(s) {
return
}
os.set[s] = len(os.list)
os.list = append(os.list, s)
}
func (os *orderedSet) has(s string) bool {
_, found := os.set[s]
return found
}
func (os *orderedSet) delete(s string) {
if i, found := os.set[s]; found {
delete(os.set, s)
os.list = append(os.list[:i-os.deletionCnt], os.list[i+1-os.deletionCnt:]...)
os.deletionCnt++
}
}
func (f *frameworkImpl) expandMultiPointPlugins(logger klog.Logger, profile *config.KubeSchedulerProfile) error {
// initialize MultiPoint plugins
for _, e := range f.getExtensionPoints(profile.Plugins) {
plugins := reflect.ValueOf(e.slicePtr).Elem()
pluginType := plugins.Type().Elem()
// build enabledSet of plugins already registered via normal extension points
// to check double registration
enabledSet := newOrderedSet()
for _, plugin := range e.plugins.Enabled {
enabledSet.insert(plugin.Name)
}
disabledSet := sets.New[string]()
for _, disabledPlugin := range e.plugins.Disabled {
disabledSet.Insert(disabledPlugin.Name)
}
if disabledSet.Has("*") {
logger.V(4).Info("Skipped MultiPoint expansion because all plugins are disabled for extension point", "extension", pluginType)
continue
}
// track plugins enabled via multipoint separately from those enabled by specific extensions,
// so that we can distinguish between double-registration and explicit overrides
multiPointEnabled := newOrderedSet()
overridePlugins := newOrderedSet()
for _, ep := range profile.Plugins.MultiPoint.Enabled {
pg, ok := f.pluginsMap[ep.Name]
if !ok {
return fmt.Errorf("%s %q does not exist", pluginType.Name(), ep.Name)
}
// if this plugin doesn't implement the type for the current extension we're trying to expand, skip
if !reflect.TypeOf(pg).Implements(pluginType) {
continue
}
// a plugin that's enabled via MultiPoint can still be disabled for specific extension points
if disabledSet.Has(ep.Name) {
logger.V(4).Info("Skipped disabled plugin for extension point", "plugin", ep.Name, "extension", pluginType)
continue
}
// if this plugin has already been enabled by the specific extension point,
// the user intent is to override the default plugin or make some other explicit setting.
// Either way, discard the MultiPoint value for this plugin.
// This maintains expected behavior for overriding default plugins (see https://github.com/kubernetes/kubernetes/pull/99582)
if enabledSet.has(ep.Name) {
overridePlugins.insert(ep.Name)
logger.Info("MultiPoint plugin is explicitly re-configured; overriding", "plugin", ep.Name)
continue
}
// if this plugin is already registered via MultiPoint, then this is
// a double registration and an error in the config.
if multiPointEnabled.has(ep.Name) {
return fmt.Errorf("plugin %q already registered as %q", ep.Name, pluginType.Name())
}
// we only need to update the multipoint set, since we already have the specific extension set from above
multiPointEnabled.insert(ep.Name)
}
// Reorder plugins. Here is the expected order:
// - part 1: overridePlugins. Their order stay intact as how they're specified in regular extension point.
// - part 2: multiPointEnabled - i.e., plugin defined in multipoint but not in regular extension point.
// - part 3: other plugins (excluded by part 1 & 2) in regular extension point.
newPlugins := reflect.New(reflect.TypeOf(e.slicePtr).Elem()).Elem()
// part 1
for _, name := range slice.CopyStrings(enabledSet.list) {
if overridePlugins.has(name) {
newPlugins = reflect.Append(newPlugins, reflect.ValueOf(f.pluginsMap[name]))
enabledSet.delete(name)
}
}
// part 2
for _, name := range multiPointEnabled.list {
newPlugins = reflect.Append(newPlugins, reflect.ValueOf(f.pluginsMap[name]))
}
// part 3
for _, name := range enabledSet.list {
newPlugins = reflect.Append(newPlugins, reflect.ValueOf(f.pluginsMap[name]))
}
plugins.Set(newPlugins)
}
return nil
}
func shouldHaveEnqueueExtensions(p framework.Plugin) bool {
switch p.(type) {
// Only PreEnqueue, PreFilter, Filter, Reserve, and Permit plugins can (should) have EnqueueExtensions.
// See the comment of EnqueueExtensions for more detailed reason here.
case framework.PreEnqueuePlugin, framework.PreFilterPlugin, framework.FilterPlugin, framework.ReservePlugin, framework.PermitPlugin:
return true
}
return false
}
func (f *frameworkImpl) fillEnqueueExtensions(p framework.Plugin) {
if !shouldHaveEnqueueExtensions(p) {
// Ignore EnqueueExtensions from plugin which isn't PreEnqueue, PreFilter, Filter, Reserve, and Permit.
return
}
ext, ok := p.(framework.EnqueueExtensions)
if !ok {
// If interface EnqueueExtensions is not implemented, register the default enqueue extensions
// to the plugin because we don't know which events the plugin is interested in.
// This is to ensure backward compatibility.
f.enqueueExtensions = append(f.enqueueExtensions, &defaultEnqueueExtension{pluginName: p.Name()})
return
}
f.enqueueExtensions = append(f.enqueueExtensions, ext)
}
// defaultEnqueueExtension is used when a plugin does not implement EnqueueExtensions interface.
type defaultEnqueueExtension struct {
pluginName string
}
func (p *defaultEnqueueExtension) Name() string { return p.pluginName }
func (p *defaultEnqueueExtension) EventsToRegister() []framework.ClusterEventWithHint {
// need to return all specific cluster events with framework.All action instead of wildcard event
// because the returning values are used to register event handlers.
// If we return the wildcard here, it won't affect the event handlers registered by the plugin
// and some events may not be registered in the event handlers.
return framework.UnrollWildCardResource()
}
func updatePluginList(pluginList interface{}, pluginSet config.PluginSet, pluginsMap map[string]framework.Plugin) error {
plugins := reflect.ValueOf(pluginList).Elem()
pluginType := plugins.Type().Elem()
set := sets.New[string]()
for _, ep := range pluginSet.Enabled {
pg, ok := pluginsMap[ep.Name]
if !ok {
return fmt.Errorf("%s %q does not exist", pluginType.Name(), ep.Name)
}
if !reflect.TypeOf(pg).Implements(pluginType) {
return fmt.Errorf("plugin %q does not extend %s plugin", ep.Name, pluginType.Name())
}
if set.Has(ep.Name) {
return fmt.Errorf("plugin %q already registered as %q", ep.Name, pluginType.Name())
}
set.Insert(ep.Name)
newPlugins := reflect.Append(plugins, reflect.ValueOf(pg))
plugins.Set(newPlugins)
}
return nil
}
// PreEnqueuePlugins returns the registered preEnqueue plugins.
func (f *frameworkImpl) PreEnqueuePlugins() []framework.PreEnqueuePlugin {
return f.preEnqueuePlugins
}
// EnqueueExtensions returns the registered reenqueue plugins.
func (f *frameworkImpl) EnqueueExtensions() []framework.EnqueueExtensions {
return f.enqueueExtensions
}
// QueueSortFunc returns the function to sort pods in scheduling queue
func (f *frameworkImpl) QueueSortFunc() framework.LessFunc {
if f == nil {
// If frameworkImpl is nil, simply keep their order unchanged.
// NOTE: this is primarily for tests.
return func(_, _ *framework.QueuedPodInfo) bool { return false }
}
if len(f.queueSortPlugins) == 0 {
panic("No QueueSort plugin is registered in the frameworkImpl.")
}
// Only one QueueSort plugin can be enabled.
return f.queueSortPlugins[0].Less
}
// RunPreFilterPlugins runs the set of configured PreFilter plugins. It returns
// *Status and its code is set to non-success if any of the plugins returns
// anything but Success/Skip.
// When it returns Skip status, returned PreFilterResult and other fields in status are just ignored,
// and coupled Filter plugin/PreFilterExtensions() will be skipped in this scheduling cycle.
// If a non-success status is returned, then the scheduling cycle is aborted.
func (f *frameworkImpl) RunPreFilterPlugins(ctx context.Context, state *framework.CycleState, pod *v1.Pod) (_ *framework.PreFilterResult, status *framework.Status) {
startTime := time.Now()
skipPlugins := sets.New[string]()
defer func() {
state.SkipFilterPlugins = skipPlugins
metrics.FrameworkExtensionPointDuration.WithLabelValues(metrics.PreFilter, status.Code().String(), f.profileName).Observe(metrics.SinceInSeconds(startTime))
}()
var result *framework.PreFilterResult
var pluginsWithNodes []string
logger := klog.FromContext(ctx)
verboseLogs := logger.V(4).Enabled()
if verboseLogs {
logger = klog.LoggerWithName(logger, "PreFilter")
}
var returnStatus *framework.Status
for _, pl := range f.preFilterPlugins {
ctx := ctx
if verboseLogs {
logger := klog.LoggerWithName(logger, pl.Name())
ctx = klog.NewContext(ctx, logger)
}
r, s := f.runPreFilterPlugin(ctx, pl, state, pod)
if s.IsSkip() {
skipPlugins.Insert(pl.Name())
continue
}
if !s.IsSuccess() {
s.SetPlugin(pl.Name())
if s.Code() == framework.UnschedulableAndUnresolvable {
// In this case, the preemption shouldn't happen in this scheduling cycle.
// So, no need to execute all PreFilter.
return nil, s
}
if s.Code() == framework.Unschedulable {
// In this case, the preemption should happen later in this scheduling cycle.
// So we need to execute all PreFilter.
// https://github.com/kubernetes/kubernetes/issues/119770
returnStatus = s
continue
}
return nil, framework.AsStatus(fmt.Errorf("running PreFilter plugin %q: %w", pl.Name(), s.AsError())).WithPlugin(pl.Name())
}
if !r.AllNodes() {
pluginsWithNodes = append(pluginsWithNodes, pl.Name())
}
result = result.Merge(r)
if !result.AllNodes() && len(result.NodeNames) == 0 {
msg := fmt.Sprintf("node(s) didn't satisfy plugin(s) %v simultaneously", pluginsWithNodes)
if len(pluginsWithNodes) == 1 {
msg = fmt.Sprintf("node(s) didn't satisfy plugin %v", pluginsWithNodes[0])
}
// When PreFilterResult filters out Nodes, the framework considers Nodes that are filtered out as getting "UnschedulableAndUnresolvable".
return result, framework.NewStatus(framework.UnschedulableAndUnresolvable, msg)
}
}
return result, returnStatus
}
func (f *frameworkImpl) runPreFilterPlugin(ctx context.Context, pl framework.PreFilterPlugin, state *framework.CycleState, pod *v1.Pod) (*framework.PreFilterResult, *framework.Status) {
if !state.ShouldRecordPluginMetrics() {
return pl.PreFilter(ctx, state, pod)
}
startTime := time.Now()
result, status := pl.PreFilter(ctx, state, pod)
f.metricsRecorder.ObservePluginDurationAsync(metrics.PreFilter, pl.Name(), status.Code().String(), metrics.SinceInSeconds(startTime))
return result, status
}
// RunPreFilterExtensionAddPod calls the AddPod interface for the set of configured
// PreFilter plugins. It returns directly if any of the plugins return any
// status other than Success.
func (f *frameworkImpl) RunPreFilterExtensionAddPod(
ctx context.Context,
state *framework.CycleState,
podToSchedule *v1.Pod,
podInfoToAdd *framework.PodInfo,
nodeInfo *framework.NodeInfo,
) (status *framework.Status) {
logger := klog.FromContext(ctx)
verboseLogs := logger.V(4).Enabled()
if verboseLogs {
logger = klog.LoggerWithName(logger, "PreFilterExtension")
}
for _, pl := range f.preFilterPlugins {
if pl.PreFilterExtensions() == nil || state.SkipFilterPlugins.Has(pl.Name()) {
continue
}
ctx := ctx
if verboseLogs {
logger := klog.LoggerWithName(logger, pl.Name())
ctx = klog.NewContext(ctx, logger)
}
status = f.runPreFilterExtensionAddPod(ctx, pl, state, podToSchedule, podInfoToAdd, nodeInfo)
if !status.IsSuccess() {
err := status.AsError()
logger.Error(err, "Plugin failed", "pod", klog.KObj(podToSchedule), "node", klog.KObj(nodeInfo.Node()), "operation", "addPod", "plugin", pl.Name())
return framework.AsStatus(fmt.Errorf("running AddPod on PreFilter plugin %q: %w", pl.Name(), err))
}
}
return nil
}
func (f *frameworkImpl) runPreFilterExtensionAddPod(ctx context.Context, pl framework.PreFilterPlugin, state *framework.CycleState, podToSchedule *v1.Pod, podInfoToAdd *framework.PodInfo, nodeInfo *framework.NodeInfo) *framework.Status {
if !state.ShouldRecordPluginMetrics() {
return pl.PreFilterExtensions().AddPod(ctx, state, podToSchedule, podInfoToAdd, nodeInfo)
}
startTime := time.Now()
status := pl.PreFilterExtensions().AddPod(ctx, state, podToSchedule, podInfoToAdd, nodeInfo)
f.metricsRecorder.ObservePluginDurationAsync(metrics.PreFilterExtensionAddPod, pl.Name(), status.Code().String(), metrics.SinceInSeconds(startTime))
return status
}
// RunPreFilterExtensionRemovePod calls the RemovePod interface for the set of configured
// PreFilter plugins. It returns directly if any of the plugins return any
// status other than Success.
func (f *frameworkImpl) RunPreFilterExtensionRemovePod(
ctx context.Context,
state *framework.CycleState,
podToSchedule *v1.Pod,
podInfoToRemove *framework.PodInfo,
nodeInfo *framework.NodeInfo,
) (status *framework.Status) {
logger := klog.FromContext(ctx)
verboseLogs := logger.V(4).Enabled()
if verboseLogs {
logger = klog.LoggerWithName(logger, "PreFilterExtension")
}
for _, pl := range f.preFilterPlugins {
if pl.PreFilterExtensions() == nil || state.SkipFilterPlugins.Has(pl.Name()) {
continue
}
ctx := ctx
if verboseLogs {
logger := klog.LoggerWithName(logger, pl.Name())
ctx = klog.NewContext(ctx, logger)
}
status = f.runPreFilterExtensionRemovePod(ctx, pl, state, podToSchedule, podInfoToRemove, nodeInfo)
if !status.IsSuccess() {
err := status.AsError()
logger.Error(err, "Plugin failed", "node", klog.KObj(nodeInfo.Node()), "operation", "removePod", "plugin", pl.Name(), "pod", klog.KObj(podToSchedule))
return framework.AsStatus(fmt.Errorf("running RemovePod on PreFilter plugin %q: %w", pl.Name(), err))
}
}
return nil
}
func (f *frameworkImpl) runPreFilterExtensionRemovePod(ctx context.Context, pl framework.PreFilterPlugin, state *framework.CycleState, podToSchedule *v1.Pod, podInfoToRemove *framework.PodInfo, nodeInfo *framework.NodeInfo) *framework.Status {
if !state.ShouldRecordPluginMetrics() {
return pl.PreFilterExtensions().RemovePod(ctx, state, podToSchedule, podInfoToRemove, nodeInfo)
}
startTime := time.Now()
status := pl.PreFilterExtensions().RemovePod(ctx, state, podToSchedule, podInfoToRemove, nodeInfo)
f.metricsRecorder.ObservePluginDurationAsync(metrics.PreFilterExtensionRemovePod, pl.Name(), status.Code().String(), metrics.SinceInSeconds(startTime))
return status
}
// RunFilterPlugins runs the set of configured Filter plugins for pod on
// the given node. If any of these plugins doesn't return "Success", the
// given node is not suitable for running pod.
// Meanwhile, the failure message and status are set for the given node.
func (f *frameworkImpl) RunFilterPlugins(
ctx context.Context,
state *framework.CycleState,
pod *v1.Pod,
nodeInfo *framework.NodeInfo,
) *framework.Status {
logger := klog.FromContext(ctx)
verboseLogs := logger.V(4).Enabled()
if verboseLogs {
logger = klog.LoggerWithName(logger, "Filter")
}
for _, pl := range f.filterPlugins {
if state.SkipFilterPlugins.Has(pl.Name()) {
continue
}
ctx := ctx
if verboseLogs {
logger := klog.LoggerWithName(logger, pl.Name())
ctx = klog.NewContext(ctx, logger)
}
if status := f.runFilterPlugin(ctx, pl, state, pod, nodeInfo); !status.IsSuccess() {
if !status.IsRejected() {
// Filter plugins are not supposed to return any status other than
// Success or Unschedulable.
status = framework.AsStatus(fmt.Errorf("running %q filter plugin: %w", pl.Name(), status.AsError()))
}
status.SetPlugin(pl.Name())
return status
}
}
return nil
}
func (f *frameworkImpl) runFilterPlugin(ctx context.Context, pl framework.FilterPlugin, state *framework.CycleState, pod *v1.Pod, nodeInfo *framework.NodeInfo) *framework.Status {
if !state.ShouldRecordPluginMetrics() {
return pl.Filter(ctx, state, pod, nodeInfo)
}
startTime := time.Now()
status := pl.Filter(ctx, state, pod, nodeInfo)
f.metricsRecorder.ObservePluginDurationAsync(metrics.Filter, pl.Name(), status.Code().String(), metrics.SinceInSeconds(startTime))
return status
}
// RunPostFilterPlugins runs the set of configured PostFilter plugins until the first
// Success, Error or UnschedulableAndUnresolvable is met; otherwise continues to execute all plugins.
func (f *frameworkImpl) RunPostFilterPlugins(ctx context.Context, state *framework.CycleState, pod *v1.Pod, filteredNodeStatusMap framework.NodeToStatusMap) (_ *framework.PostFilterResult, status *framework.Status) {
startTime := time.Now()
defer func() {
metrics.FrameworkExtensionPointDuration.WithLabelValues(metrics.PostFilter, status.Code().String(), f.profileName).Observe(metrics.SinceInSeconds(startTime))
}()
logger := klog.FromContext(ctx)
verboseLogs := logger.V(4).Enabled()
if verboseLogs {
logger = klog.LoggerWithName(logger, "PostFilter")
}
// `result` records the last meaningful(non-noop) PostFilterResult.
var result *framework.PostFilterResult
var reasons []string
var rejectorPlugin string
for _, pl := range f.postFilterPlugins {
ctx := ctx
if verboseLogs {
logger := klog.LoggerWithName(logger, pl.Name())
ctx = klog.NewContext(ctx, logger)
}
r, s := f.runPostFilterPlugin(ctx, pl, state, pod, filteredNodeStatusMap)
if s.IsSuccess() {
return r, s
} else if s.Code() == framework.UnschedulableAndUnresolvable {
return r, s.WithPlugin(pl.Name())
} else if !s.IsRejected() {
// Any status other than Success, Unschedulable or UnschedulableAndUnresolvable is Error.
return nil, framework.AsStatus(s.AsError()).WithPlugin(pl.Name())
} else if r != nil && r.Mode() != framework.ModeNoop {
result = r
}
reasons = append(reasons, s.Reasons()...)
// Record the first failed plugin unless we proved that
// the latter is more relevant.
if len(rejectorPlugin) == 0 {
rejectorPlugin = pl.Name()
}
}
return result, framework.NewStatus(framework.Unschedulable, reasons...).WithPlugin(rejectorPlugin)
}
func (f *frameworkImpl) runPostFilterPlugin(ctx context.Context, pl framework.PostFilterPlugin, state *framework.CycleState, pod *v1.Pod, filteredNodeStatusMap framework.NodeToStatusMap) (*framework.PostFilterResult, *framework.Status) {
if !state.ShouldRecordPluginMetrics() {
return pl.PostFilter(ctx, state, pod, filteredNodeStatusMap)
}
startTime := time.Now()
r, s := pl.PostFilter(ctx, state, pod, filteredNodeStatusMap)
f.metricsRecorder.ObservePluginDurationAsync(metrics.PostFilter, pl.Name(), s.Code().String(), metrics.SinceInSeconds(startTime))
return r, s
}
// RunFilterPluginsWithNominatedPods runs the set of configured filter plugins
// for nominated pod on the given node.
// This function is called from two different places: Schedule and Preempt.
// When it is called from Schedule, we want to test whether the pod is
// schedulable on the node with all the existing pods on the node plus higher
// and equal priority pods nominated to run on the node.
// When it is called from Preempt, we should remove the victims of preemption
// and add the nominated pods. Removal of the victims is done by
// SelectVictimsOnNode(). Preempt removes victims from PreFilter state and
// NodeInfo before calling this function.
func (f *frameworkImpl) RunFilterPluginsWithNominatedPods(ctx context.Context, state *framework.CycleState, pod *v1.Pod, info *framework.NodeInfo) *framework.Status {
var status *framework.Status
podsAdded := false
// We run filters twice in some cases. If the node has greater or equal priority
// nominated pods, we run them when those pods are added to PreFilter state and nodeInfo.
// If all filters succeed in this pass, we run them again when these
// nominated pods are not added. This second pass is necessary because some
// filters such as inter-pod affinity may not pass without the nominated pods.
// If there are no nominated pods for the node or if the first run of the
// filters fail, we don't run the second pass.
// We consider only equal or higher priority pods in the first pass, because
// those are the current "pod" must yield to them and not take a space opened
// for running them. It is ok if the current "pod" take resources freed for
// lower priority pods.
// Requiring that the new pod is schedulable in both circumstances ensures that
// we are making a conservative decision: filters like resources and inter-pod
// anti-affinity are more likely to fail when the nominated pods are treated
// as running, while filters like pod affinity are more likely to fail when
// the nominated pods are treated as not running. We can't just assume the
// nominated pods are running because they are not running right now and in fact,
// they may end up getting scheduled to a different node.
logger := klog.FromContext(ctx)
logger = klog.LoggerWithName(logger, "FilterWithNominatedPods")
ctx = klog.NewContext(ctx, logger)
for i := 0; i < 2; i++ {
stateToUse := state
nodeInfoToUse := info
if i == 0 {
var err error
podsAdded, stateToUse, nodeInfoToUse, err = addNominatedPods(ctx, f, pod, state, info)
if err != nil {
return framework.AsStatus(err)
}
} else if !podsAdded || !status.IsSuccess() {
break
}
status = f.RunFilterPlugins(ctx, stateToUse, pod, nodeInfoToUse)
if !status.IsSuccess() && !status.IsRejected() {
return status
}
}
return status
}