-
Notifications
You must be signed in to change notification settings - Fork 458
/
scheduler.go
132 lines (107 loc) · 5.07 KB
/
scheduler.go
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
// 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 backupbucket
import (
"context"
"sync"
"time"
"sigs.k8s.io/controller-runtime/pkg/reconcile"
"github.com/prometheus/client_golang/prometheus"
"k8s.io/client-go/tools/cache"
"k8s.io/client-go/tools/record"
"k8s.io/client-go/util/workqueue"
gardencoreinformers "github.com/gardener/gardener/pkg/client/core/informers/externalversions"
"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"
)
// SchedulerController controls Seeds.
type SchedulerController struct {
config *config.SchedulerConfiguration
reconciler reconcile.Reconciler
recorder record.EventRecorder
backupBucketQueue workqueue.RateLimitingInterface
backupBucketSynced cache.InformerSynced
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(ctx context.Context, k8sGardenClient kubernetes.Interface, k8sGardenCoreInformers gardencoreinformers.SharedInformerFactory, config *config.SchedulerConfiguration, recorder record.EventRecorder) *SchedulerController {
var (
gardencorev1beta1Informer = k8sGardenCoreInformers.Core().V1beta1()
backupBucketInformer = gardencorev1beta1Informer.BackupBuckets()
backupBuckerQueue = workqueue.NewNamedRateLimitingQueue(workqueue.NewItemExponentialFailureRateLimiter(config.Schedulers.BackupBucket.RetrySyncPeriod.Duration, 12*time.Hour), "gardener-backup-bucket-scheduler")
)
schedulerController := &SchedulerController{
reconciler: newReconciler(ctx, k8sGardenClient.Client(), recorder),
config: config,
recorder: recorder,
backupBucketQueue: backupBuckerQueue,
workerCh: make(chan int),
}
backupBucketInformer.Informer().AddEventHandler(cache.ResourceEventHandlerFuncs{
AddFunc: schedulerController.backupBucketAdd,
UpdateFunc: schedulerController.backupBucketUpdate,
})
schedulerController.backupBucketSynced = backupBucketInformer.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.backupBucketSynced) {
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.CreateWorker(ctx, c.backupBucketQueue, "gardener--backup-bucket-scheduler", c.reconciler, &waitGroup, c.workerCh)
}
logger.Logger.Infof("BackupBucket Scheduler controller initialized with %d workers", c.config.Schedulers.Shoot.ConcurrentSyncs)
// Shutdown handling
<-ctx.Done()
c.backupBucketQueue.ShutDown()
for {
if c.backupBucketQueue.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.backupBucketQueue.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-backup-bucket-scheduler"}).Inc()
return
}
ch <- metric
}