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queue_controller.go
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/
queue_controller.go
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/*
Copyright 2019 The Volcano 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 queue
import (
"fmt"
"sync"
"time"
v1 "k8s.io/api/core/v1"
apierrors "k8s.io/apimachinery/pkg/api/errors"
utilruntime "k8s.io/apimachinery/pkg/util/runtime"
"k8s.io/apimachinery/pkg/util/wait"
"k8s.io/client-go/kubernetes"
corev1 "k8s.io/client-go/kubernetes/typed/core/v1"
"k8s.io/client-go/tools/cache"
"k8s.io/client-go/tools/record"
"k8s.io/client-go/util/workqueue"
"k8s.io/klog"
busv1alpha1 "volcano.sh/volcano/pkg/apis/bus/v1alpha1"
schedulingv1alpha2 "volcano.sh/volcano/pkg/apis/scheduling/v1alpha2"
vcclientset "volcano.sh/volcano/pkg/client/clientset/versioned"
versionedscheme "volcano.sh/volcano/pkg/client/clientset/versioned/scheme"
informerfactory "volcano.sh/volcano/pkg/client/informers/externalversions"
busv1alpha1informer "volcano.sh/volcano/pkg/client/informers/externalversions/bus/v1alpha1"
schedulinginformer "volcano.sh/volcano/pkg/client/informers/externalversions/scheduling/v1alpha2"
busv1alpha1lister "volcano.sh/volcano/pkg/client/listers/bus/v1alpha1"
schedulinglister "volcano.sh/volcano/pkg/client/listers/scheduling/v1alpha2"
queuestate "volcano.sh/volcano/pkg/controllers/queue/state"
)
const (
// maxRetries is the number of times a queue or command will be retried before it is dropped out of the queue.
// With the current rate-limiter in use (5ms*2^(maxRetries-1)) the following numbers represent the times
// a queue or command is going to be requeued:
// 5ms, 10ms, 20ms, 40ms, 80ms, 160ms, 320ms, 640ms, 1.3s, 2.6s, 5.1s, 10.2s, 20.4s, 41s, 82s
maxRetries = 15
)
// Controller manages queue status.
type Controller struct {
kubeClient kubernetes.Interface
vcClient vcclientset.Interface
// informer
queueInformer schedulinginformer.QueueInformer
pgInformer schedulinginformer.PodGroupInformer
// queueLister
queueLister schedulinglister.QueueLister
queueSynced cache.InformerSynced
// podGroup lister
pgLister schedulinglister.PodGroupLister
pgSynced cache.InformerSynced
cmdInformer busv1alpha1informer.CommandInformer
cmdLister busv1alpha1lister.CommandLister
cmdSynced cache.InformerSynced
// queues that need to be updated.
queue workqueue.RateLimitingInterface
commandQueue workqueue.RateLimitingInterface
pgMutex sync.RWMutex
// queue name -> podgroup namespace/name
podGroups map[string]map[string]struct{}
syncHandler func(req *schedulingv1alpha2.QueueRequest) error
syncCommandHandler func(cmd *busv1alpha1.Command) error
enqueueQueue func(req *schedulingv1alpha2.QueueRequest)
recorder record.EventRecorder
}
// NewQueueController creates a QueueController
func NewQueueController(
kubeClient kubernetes.Interface,
vcClient vcclientset.Interface,
) *Controller {
factory := informerfactory.NewSharedInformerFactory(vcClient, 0)
queueInformer := factory.Scheduling().V1alpha2().Queues()
pgInformer := factory.Scheduling().V1alpha2().PodGroups()
eventBroadcaster := record.NewBroadcaster()
eventBroadcaster.StartLogging(klog.Infof)
eventBroadcaster.StartRecordingToSink(&corev1.EventSinkImpl{Interface: kubeClient.CoreV1().Events("")})
c := &Controller{
kubeClient: kubeClient,
vcClient: vcClient,
queueInformer: queueInformer,
pgInformer: pgInformer,
queueLister: queueInformer.Lister(),
queueSynced: queueInformer.Informer().HasSynced,
pgLister: pgInformer.Lister(),
pgSynced: pgInformer.Informer().HasSynced,
queue: workqueue.NewRateLimitingQueue(workqueue.DefaultControllerRateLimiter()),
commandQueue: workqueue.NewRateLimitingQueue(workqueue.DefaultControllerRateLimiter()),
podGroups: make(map[string]map[string]struct{}),
recorder: eventBroadcaster.NewRecorder(versionedscheme.Scheme, v1.EventSource{Component: "vc-controller-manager"}),
}
queueInformer.Informer().AddEventHandler(cache.ResourceEventHandlerFuncs{
AddFunc: c.addQueue,
UpdateFunc: c.updateQueue,
DeleteFunc: c.deleteQueue,
})
pgInformer.Informer().AddEventHandler(cache.ResourceEventHandlerFuncs{
AddFunc: c.addPodGroup,
UpdateFunc: c.updatePodGroup,
DeleteFunc: c.deletePodGroup,
})
c.cmdInformer = informerfactory.NewSharedInformerFactory(c.vcClient, 0).Bus().V1alpha1().Commands()
c.cmdInformer.Informer().AddEventHandler(cache.FilteringResourceEventHandler{
FilterFunc: func(obj interface{}) bool {
switch obj.(type) {
case *busv1alpha1.Command:
cmd := obj.(*busv1alpha1.Command)
return IsQueueReference(cmd.TargetObject)
default:
return false
}
},
Handler: cache.ResourceEventHandlerFuncs{
AddFunc: c.addCommand,
},
})
c.cmdLister = c.cmdInformer.Lister()
c.cmdSynced = c.cmdInformer.Informer().HasSynced
queuestate.SyncQueue = c.syncQueue
queuestate.OpenQueue = c.openQueue
queuestate.CloseQueue = c.closeQueue
c.syncHandler = c.handleQueue
c.syncCommandHandler = c.handleCommand
c.enqueueQueue = c.enqueue
return c
}
// Run starts QueueController
func (c *Controller) Run(stopCh <-chan struct{}) {
defer utilruntime.HandleCrash()
defer c.queue.ShutDown()
defer c.commandQueue.ShutDown()
klog.Infof("Starting queue controller.")
defer klog.Infof("Shutting down queue controller.")
go c.queueInformer.Informer().Run(stopCh)
go c.pgInformer.Informer().Run(stopCh)
go c.cmdInformer.Informer().Run(stopCh)
if !cache.WaitForCacheSync(stopCh, c.queueSynced, c.pgSynced, c.cmdSynced) {
klog.Errorf("unable to sync caches for queue controller.")
return
}
go wait.Until(c.worker, 0, stopCh)
go wait.Until(c.commandWorker, 0, stopCh)
<-stopCh
}
// worker runs a worker thread that just dequeues items, processes them, and
// marks them done. You may run as many of these in parallel as you wish; the
// workqueue guarantees that they will not end up processing the same `queue`
// at the same time.
func (c *Controller) worker() {
for c.processNextWorkItem() {
}
}
func (c *Controller) processNextWorkItem() bool {
obj, shutdown := c.queue.Get()
if shutdown {
return false
}
defer c.queue.Done(obj)
req, ok := obj.(*schedulingv1alpha2.QueueRequest)
if !ok {
klog.Errorf("%v is not a valid queue request struct.", obj)
return true
}
err := c.syncHandler(req)
c.handleQueueErr(err, obj)
return true
}
func (c *Controller) handleQueue(req *schedulingv1alpha2.QueueRequest) error {
startTime := time.Now()
defer func() {
klog.V(4).Infof("Finished syncing queue %s (%v).", req.Name, time.Since(startTime))
}()
queue, err := c.queueLister.Get(req.Name)
if err != nil {
if apierrors.IsNotFound(err) {
klog.V(4).Infof("Queue %s has been deleted.", req.Name)
return nil
}
return fmt.Errorf("get queue %s failed for %v", req.Name, err)
}
queueState := queuestate.NewState(queue)
if queueState == nil {
return fmt.Errorf("queue %s state %s is invalid", queue.Name, queue.Status.State)
}
if err := queueState.Execute(req.Action); err != nil {
return fmt.Errorf("sync queue %s failed for %v, event is %v, action is %s",
req.Name, err, req.Event, req.Action)
}
return nil
}
func (c *Controller) handleQueueErr(err error, obj interface{}) {
if err == nil {
c.queue.Forget(obj)
return
}
if c.queue.NumRequeues(obj) < maxRetries {
klog.V(4).Infof("Error syncing queue request %v for %v.", obj, err)
c.queue.AddRateLimited(obj)
return
}
req, _ := obj.(*schedulingv1alpha2.QueueRequest)
c.recordEventsForQueue(req.Name, v1.EventTypeWarning, string(req.Action),
fmt.Sprintf("%v queue failed for %v", req.Action, err))
klog.V(2).Infof("Dropping queue request %v out of the queue for %v.", obj, err)
c.queue.Forget(obj)
}
func (c *Controller) commandWorker() {
for c.processNextCommand() {
}
}
func (c *Controller) processNextCommand() bool {
obj, shutdown := c.commandQueue.Get()
if shutdown {
return false
}
defer c.commandQueue.Done(obj)
cmd, ok := obj.(*busv1alpha1.Command)
if !ok {
klog.Errorf("%v is not a valid Command struct.", obj)
return true
}
err := c.syncCommandHandler(cmd)
c.handleCommandErr(err, obj)
return true
}
func (c *Controller) handleCommand(cmd *busv1alpha1.Command) error {
startTime := time.Now()
defer func() {
klog.V(4).Infof("Finished syncing command %s/%s (%v).", cmd.Namespace, cmd.Name, time.Since(startTime))
}()
err := c.vcClient.BusV1alpha1().Commands(cmd.Namespace).Delete(cmd.Name, nil)
if err != nil {
if true == apierrors.IsNotFound(err) {
return nil
}
return fmt.Errorf("failed to delete command <%s/%s> for %v", cmd.Namespace, cmd.Name, err)
}
req := &schedulingv1alpha2.QueueRequest{
Name: cmd.TargetObject.Name,
Event: schedulingv1alpha2.QueueCommandIssuedEvent,
Action: schedulingv1alpha2.QueueAction(cmd.Action),
}
c.enqueueQueue(req)
return nil
}
func (c *Controller) handleCommandErr(err error, obj interface{}) {
if err == nil {
c.commandQueue.Forget(obj)
return
}
if c.commandQueue.NumRequeues(obj) < maxRetries {
klog.V(4).Infof("Error syncing command %v for %v.", obj, err)
c.commandQueue.AddRateLimited(obj)
return
}
klog.V(2).Infof("Dropping command %v out of the queue for %v.", obj, err)
c.commandQueue.Forget(obj)
}