/
scheduler.go
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/
scheduler.go
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// Copyright (c) 2019 SAP SE or an SAP affiliate company. All rights reserved. This file is licensed under the Apache Software License, v. 2 except as noted otherwise in the LICENSE file
//
// 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 shoot
import (
"context"
"sync"
"time"
gardencoreinformers "github.com/gardener/gardener/pkg/client/core/informers/externalversions"
gardencorelisters "github.com/gardener/gardener/pkg/client/core/listers/core/v1beta1"
"github.com/gardener/gardener/pkg/client/kubernetes"
"github.com/gardener/gardener/pkg/controllerutils"
"github.com/gardener/gardener/pkg/logger"
"github.com/gardener/gardener/pkg/scheduler"
"github.com/gardener/gardener/pkg/scheduler/apis/config"
"github.com/prometheus/client_golang/prometheus"
"k8s.io/client-go/tools/cache"
"k8s.io/client-go/tools/record"
"k8s.io/client-go/util/workqueue"
)
// SchedulerController controls Seeds.
type SchedulerController struct {
k8sGardenClient kubernetes.Interface
k8sGardenCoreInformers gardencoreinformers.SharedInformerFactory
config *config.SchedulerConfiguration
control SchedulerInterface
recorder record.EventRecorder
cloudProfileLister gardencorelisters.CloudProfileLister
cloudProfileSynced cache.InformerSynced
seedLister gardencorelisters.SeedLister
seedSynced cache.InformerSynced
shootLister gardencorelisters.ShootLister
shootSynced cache.InformerSynced
shootQueue workqueue.RateLimitingInterface
workerCh chan int
numberOfRunningWorkers int
}
// NewGardenerScheduler takes a Kubernetes client for the Garden clusters <k8sGardenClient>, a <sharedInformerFactory>, a struct containing the scheduler configuration and a <recorder> for
// event recording. It creates a new NewGardenerScheduler.
func NewGardenerScheduler(k8sGardenClient kubernetes.Interface, gardenCoreInformerFactory gardencoreinformers.SharedInformerFactory, config *config.SchedulerConfiguration, recorder record.EventRecorder) *SchedulerController {
var (
coreV1Alpha1Informer = gardenCoreInformerFactory.Core().V1beta1()
shootInformer = coreV1Alpha1Informer.Shoots()
shootLister = shootInformer.Lister()
seedInformer = coreV1Alpha1Informer.Seeds()
seedLister = seedInformer.Lister()
cloudProfileInformer = coreV1Alpha1Informer.CloudProfiles()
cloudProfileLister = cloudProfileInformer.Lister()
shootQueue = workqueue.NewNamedRateLimitingQueue(workqueue.NewItemExponentialFailureRateLimiter(config.Schedulers.Shoot.RetrySyncPeriod.Duration, 12*time.Hour), "gardener-shoot-scheduler")
)
schedulerController := &SchedulerController{
k8sGardenClient: k8sGardenClient,
k8sGardenCoreInformers: gardenCoreInformerFactory,
control: NewDefaultControl(k8sGardenClient, gardenCoreInformerFactory, recorder, config, shootLister, seedLister, cloudProfileLister),
config: config,
recorder: recorder,
cloudProfileLister: cloudProfileLister,
seedLister: seedLister,
shootQueue: shootQueue,
shootLister: shootLister,
workerCh: make(chan int),
}
shootInformer.Informer().AddEventHandler(cache.ResourceEventHandlerFuncs{
AddFunc: schedulerController.shootAdd,
UpdateFunc: schedulerController.shootUpdate,
})
schedulerController.cloudProfileSynced = cloudProfileInformer.Informer().HasSynced
schedulerController.seedSynced = seedInformer.Informer().HasSynced
schedulerController.shootSynced = shootInformer.Informer().HasSynced
return schedulerController
}
// Run runs the SchedulerController until the given stop channel can be read from.
func (c *SchedulerController) Run(ctx context.Context, k8sGardenCoreInformers gardencoreinformers.SharedInformerFactory) {
var waitGroup sync.WaitGroup
k8sGardenCoreInformers.Start(ctx.Done())
if !cache.WaitForCacheSync(ctx.Done(), c.cloudProfileSynced, c.seedSynced, c.shootSynced) {
logger.Logger.Error("Timed out waiting for caches to sync")
return
}
// Count number of running workers.
go func() {
for res := range c.workerCh {
c.numberOfRunningWorkers += res
logger.Logger.Debugf("Current number of running Scheduler workers is %d", c.numberOfRunningWorkers)
}
}()
for i := 0; i < c.config.Schedulers.Shoot.ConcurrentSyncs; i++ {
controllerutils.DeprecatedCreateWorker(ctx, c.shootQueue, "gardener-scheduler", func(key string) error { return c.reconcileShootKey(ctx, key) }, &waitGroup, c.workerCh)
}
logger.Logger.Infof("Shoot Scheduler controller initialized with %d workers (with Strategy: %s)", c.config.Schedulers.Shoot.ConcurrentSyncs, c.config.Schedulers.Shoot.Strategy)
<-ctx.Done()
c.shootQueue.ShutDown()
for {
if c.shootQueue.Len() == 0 && c.numberOfRunningWorkers == 0 {
logger.Logger.Debug("No running Scheduler worker and no items left in the queues. Terminated Scheduler controller...")
break
}
logger.Logger.Debugf("Waiting for %d Scheduler worker(s) to finish (%d item(s) left in the queues)...", c.numberOfRunningWorkers, c.shootQueue.Len())
time.Sleep(5 * time.Second)
}
waitGroup.Wait()
}
// RunningWorkers returns the number of running workers.
func (c *SchedulerController) RunningWorkers() int {
return c.numberOfRunningWorkers
}
// CollectMetrics implements gardenmetrics.ControllerMetricsCollector interface
func (c *SchedulerController) CollectMetrics(ch chan<- prometheus.Metric) {
metric, err := prometheus.NewConstMetric(scheduler.ControllerWorkerSum, prometheus.GaugeValue, float64(c.RunningWorkers()), "seed")
if err != nil {
scheduler.ScrapeFailures.With(prometheus.Labels{"kind": "gardener-shoot-scheduler"}).Inc()
return
}
ch <- metric
}