support preemption when the number of attachment volumes of a node reaches the upper limit

cmd/scheduler/app/options/options.go

@@ -42,6 +42,7 @@ const (
 	defaultMinNodesToFind             = 100
 	defaultPercentageOfNodesToFind    = 0
 	defaultLockObjectNamespace        = "volcano-system"
+	defaultNodeWorkers                = 20
 )
 
 // ServerOption is the main context object for the controller manager.
@@ -77,6 +78,7 @@ type ServerOption struct {
 
 	NodeSelector      []string
 	EnableCacheDumper bool
+	NodeWorkerThreads uint32
 }
 
 type DecryptFunc func(c *ServerOption) error
@@ -131,6 +133,7 @@ func (s *ServerOption) AddFlags(fs *pflag.FlagSet) {
 	fs.BoolVar(&s.EnableMetrics, "enable-metrics", false, "Enable the metrics function; it is false by default")
 	fs.StringSliceVar(&s.NodeSelector, "node-selector", nil, "volcano only work with the labeled node, like: --node-selector=volcano.sh/role:train --node-selector=volcano.sh/role:serving")
 	fs.BoolVar(&s.EnableCacheDumper, "cache-dumper", true, "Enable the cache dumper, it's true by default")
+	fs.Uint32Var(&s.NodeWorkerThreads, "node-worker-threads", defaultNodeWorkers, "The number of threads syncing node operations.")
 }
 
 // CheckOptionOrDie check lock-object-namespace when LeaderElection is enabled.

cmd/scheduler/app/options/options_test.go

@@ -57,6 +57,7 @@ func TestAddFlags(t *testing.T) {
 		PercentageOfNodesToFind:    defaultPercentageOfNodesToFind,
 		EnableLeaderElection:       true,
 		LockObjectNamespace:        defaultLockObjectNamespace,
+		NodeWorkerThreads:          defaultNodeWorkers,
 	}
 
 	if !reflect.DeepEqual(expected, s) {

cmd/scheduler/app/server.go

@@ -74,12 +74,7 @@ func Run(opt *options.ServerOption) error {
 		}
 	}
 
-	sched, err := scheduler.NewScheduler(config,
-		opt.SchedulerNames,
-		opt.SchedulerConf,
-		opt.SchedulePeriod,
-		opt.DefaultQueue,
-		opt.NodeSelector)
+	sched, err := scheduler.NewScheduler(config, opt)
 	if err != nil {
 		panic(err)
 	}

pkg/scheduler/actions/allocate/allocate_test.go

@@ -268,7 +268,7 @@ func TestAllocate(t *testing.T) {
 			}
 
 			for _, node := range test.nodes {
-				schedulerCache.AddNode(node)
+				schedulerCache.AddOrUpdateNode(node)
 			}
 			for _, pod := range test.pods {
 				schedulerCache.AddPod(pod)
@@ -454,7 +454,7 @@ func TestAllocateWithDynamicPVC(t *testing.T) {
 				schedulerCache.AddPod(pod)
 			}
 			for _, node := range test.nodes {
-				schedulerCache.AddNode(node)
+				schedulerCache.AddOrUpdateNode(node)
 			}
 
 			trueValue := true

pkg/scheduler/actions/preempt/preempt_test.go

@@ -314,7 +314,7 @@ func TestPreempt(t *testing.T) {
 				Value: 10,
 			}
 			for _, node := range test.nodes {
-				schedulerCache.AddNode(node)
+				schedulerCache.AddOrUpdateNode(node)
 			}
 			for _, pod := range test.pods {
 				schedulerCache.AddPod(pod)

pkg/scheduler/actions/reclaim/reclaim_test.go

@@ -148,7 +148,7 @@ func TestReclaim(t *testing.T) {
 			Value: 10,
 		}
 		for _, node := range test.nodes {
-			schedulerCache.AddNode(node)
+			schedulerCache.AddOrUpdateNode(node)
 		}
 		for _, pod := range test.pods {
 			schedulerCache.AddPod(pod)

pkg/scheduler/actions/shuffle/shuffle_test.go

@@ -163,7 +163,7 @@ func TestShuffle(t *testing.T) {
 		}
 
 		for _, node := range test.nodes {
-			schedulerCache.AddNode(node)
+			schedulerCache.AddOrUpdateNode(node)
 		}
 		for _, q := range test.queues {
 			schedulerCache.AddQueueV1beta1(q)

pkg/scheduler/cache/cache.go

@@ -83,8 +83,8 @@ func init() {
 }
 
 // New returns a Cache implementation.
-func New(config *rest.Config, schedulerNames []string, defaultQueue string, nodeSelectors []string) Cache {
-	return newSchedulerCache(config, schedulerNames, defaultQueue, nodeSelectors)
+func New(config *rest.Config, schedulerNames []string, defaultQueue string, nodeSelectors []string, nodeWorkers uint32) Cache {
+	return newSchedulerCache(config, schedulerNames, defaultQueue, nodeSelectors, nodeWorkers)
 }
 
 // SchedulerCache cache for the kube batch
@@ -134,6 +134,7 @@ type SchedulerCache struct {
 	NamespaceCollection map[string]*schedulingapi.NamespaceCollection
 
 	errTasks    workqueue.RateLimitingInterface
+	nodeQueue   workqueue.RateLimitingInterface
 	DeletedJobs workqueue.RateLimitingInterface
 
 	informerFactory   informers.SharedInformerFactory
@@ -145,6 +146,8 @@ type SchedulerCache struct {
 
 	// A map from image name to its imageState.
 	imageStates map[string]*imageState
+
+	nodeWorkers uint32
 }
 
 type imageState struct {
@@ -387,7 +390,7 @@ func (pgb *podgroupBinder) Bind(job *schedulingapi.JobInfo, cluster string) (*sc
 	return job, nil
 }
 
-func newSchedulerCache(config *rest.Config, schedulerNames []string, defaultQueue string, nodeSelectors []string) *SchedulerCache {
+func newSchedulerCache(config *rest.Config, schedulerNames []string, defaultQueue string, nodeSelectors []string, nodeWorkers uint32) *SchedulerCache {
 	kubeClient, err := kubernetes.NewForConfig(config)
 	if err != nil {
 		panic(fmt.Sprintf("failed init kubeClient, with err: %v", err))
@@ -435,6 +438,7 @@ func newSchedulerCache(config *rest.Config, schedulerNames []string, defaultQueu
 		Queues:              make(map[schedulingapi.QueueID]*schedulingapi.QueueInfo),
 		PriorityClasses:     make(map[string]*schedulingv1.PriorityClass),
 		errTasks:            workqueue.NewRateLimitingQueue(workqueue.DefaultControllerRateLimiter()),
+		nodeQueue:           workqueue.NewRateLimitingQueue(workqueue.DefaultControllerRateLimiter()),
 		DeletedJobs:         workqueue.NewRateLimitingQueue(workqueue.DefaultControllerRateLimiter()),
 		kubeClient:          kubeClient,
 		vcClient:            vcClient,
@@ -446,7 +450,8 @@ func newSchedulerCache(config *rest.Config, schedulerNames []string, defaultQueu
 		CSINodesStatus:      make(map[string]*schedulingapi.CSINodeStatusInfo),
 		imageStates:         make(map[string]*imageState),
 
-		NodeList: []string{},
+		NodeList:    []string{},
+		nodeWorkers: nodeWorkers,
 	}
 	if len(nodeSelectors) > 0 {
 		for _, nodeSelectorLabel := range nodeSelectors {
@@ -700,6 +705,11 @@ func newSchedulerCache(config *rest.Config, schedulerNames []string, defaultQueu
 func (sc *SchedulerCache) Run(stopCh <-chan struct{}) {
 	sc.informerFactory.Start(stopCh)
 	sc.vcInformerFactory.Start(stopCh)
+	sc.WaitForCacheSync(stopCh)
+	for i := 0; i < int(sc.nodeWorkers); i++ {
+		go wait.Until(sc.runNodeWorker, 0, stopCh)
+	}
+
 	// Re-sync error tasks.
 	go wait.Until(sc.processResyncTask, 0, stopCh)
 
@@ -990,6 +1000,36 @@ func (sc *SchedulerCache) processResyncTask() {
 	}
 }
 
+func (sc *SchedulerCache) runNodeWorker() {
+	for sc.processSyncNode() {
+	}
+}
+
+func (sc *SchedulerCache) processSyncNode() bool {
+	obj, shutdown := sc.nodeQueue.Get()
+	if shutdown {
+		return false
+	}
+	defer sc.nodeQueue.Done(obj)
+
+	nodeName, ok := obj.(string)
+	if !ok {
+		klog.Errorf("failed to convert %v to string", obj)
+		return true
+	}
+
+	klog.V(5).Infof("started sync node %s", nodeName)
+	err := sc.SyncNode(nodeName)
+	if err == nil {
+		sc.nodeQueue.Forget(nodeName)
+		return true
+	}
+
+	klog.Errorf("Failed to sync node <%s>, retry it.", nodeName)
+	sc.nodeQueue.AddRateLimited(nodeName)
+	return true
+}
+
 // AddBindTask add task to be bind to a cache which consumes by go runtime
 func (sc *SchedulerCache) AddBindTask(taskInfo *schedulingapi.TaskInfo) error {
 	klog.V(5).Infof("add bind task %v/%v", taskInfo.Namespace, taskInfo.Name)

pkg/scheduler/cache/cache_test.go

@@ -32,7 +32,6 @@ import (
 	"k8s.io/client-go/tools/cache"
 	"k8s.io/client-go/tools/record"
 	"k8s.io/client-go/util/workqueue"
-
 	"volcano.sh/volcano/pkg/scheduler/api"
 	volumescheduling "volcano.sh/volcano/pkg/scheduler/capabilities/volumebinding"
 	"volcano.sh/volcano/pkg/scheduler/util"
@@ -155,7 +154,7 @@ func TestSchedulerCache_Bind_NodeWithSufficientResources(t *testing.T) {
 	cache.AddPod(pod)
 
 	node := buildNode("n1", api.BuildResourceList("2000m", "10G", []api.ScalarResource{{Name: "pods", Value: "10"}}...))
-	cache.AddNode(node)
+	cache.AddOrUpdateNode(node)
 
 	task := api.NewTaskInfo(pod)
 	task.Job = "j1"
@@ -187,7 +186,7 @@ func TestSchedulerCache_Bind_NodeWithInsufficientResources(t *testing.T) {
 	cache.AddPod(pod)
 
 	node := buildNode("n1", api.BuildResourceList("2000m", "10G", []api.ScalarResource{{Name: "pods", Value: "10"}}...))
-	cache.AddNode(node)
+	cache.AddOrUpdateNode(node)
 
 	task := api.NewTaskInfo(pod)
 	task.Job = "j1"
@@ -299,7 +298,7 @@ func TestNodeOperation(t *testing.T) {
 		}
 
 		for _, n := range test.nodes {
-			cache.AddNode(n)
+			cache.AddOrUpdateNode(n)
 		}
 
 		if !reflect.DeepEqual(cache, test.expected) {
@@ -308,7 +307,7 @@ func TestNodeOperation(t *testing.T) {
 		}
 
 		// delete node
-		cache.DeleteNode(test.deletedNode)
+		cache.RemoveNode(test.deletedNode.Name)
 		if !reflect.DeepEqual(cache, test.delExpect) {
 			t.Errorf("case %d: \n expected %v, \n got %v \n",
 				i, test.delExpect, cache)
@@ -336,6 +335,7 @@ func TestBindTasks(t *testing.T) {
 		pvInformer:      informerFactory.Core().V1().PersistentVolumes(),
 		scInformer:      informerFactory.Storage().V1().StorageClasses(),
 		errTasks:        workqueue.NewRateLimitingQueue(workqueue.DefaultControllerRateLimiter()),
+		nodeQueue:       workqueue.NewRateLimitingQueue(workqueue.DefaultControllerRateLimiter()),
 	}
 
 	sc.Binder = &DefaultBinder{}
@@ -359,12 +359,6 @@ func TestBindTasks(t *testing.T) {
 			DeleteFunc: sc.DeletePod,
 		},
 	)
-	sc.nodeInformer.Informer().AddEventHandler(
-		cache.ResourceEventHandlerFuncs{
-			AddFunc:    sc.AddNode,
-			UpdateFunc: sc.UpdateNode,
-		},
-	)
 	ctx, cancel := context.WithCancel(context.Background())
 	defer cancel()
 	go wait.Until(sc.processBindTask, time.Millisecond*5, ctx.Done())
@@ -375,9 +369,10 @@ func TestBindTasks(t *testing.T) {
 
 	// make sure pod exist when calling fake client binding
 	fakeKube.CoreV1().Pods(pod.Namespace).Create(ctx, pod, metav1.CreateOptions{})
-	fakeKube.CoreV1().Nodes().Create(ctx, node, metav1.CreateOptions{})
 	informerFactory.Start(ctx.Done())
 	informerFactory.WaitForCacheSync(ctx.Done())
+	// set node in cache directly
+	sc.AddOrUpdateNode(node)
 
 	task := api.NewTaskInfo(pod)
 	task.NodeName = "n1"