feature(scheduler): won't run Filter if PreFilter returned a Skip status

pkg/scheduler/framework/cycle_state.go

@@ -19,6 +19,8 @@ package framework
 import (
 	"errors"
 	"sync"
+
+	"k8s.io/apimachinery/pkg/util/sets"
 )
 
 var (
@@ -48,6 +50,8 @@ type CycleState struct {
 	storage sync.Map
 	// if recordPluginMetrics is true, PluginExecutionDuration will be recorded for this cycle.
 	recordPluginMetrics bool
+	// SkipFilterPlugins are plugins that will be skipped in the Filter extension point.
+	SkipFilterPlugins sets.String
 }
 
 // NewCycleState initializes a new CycleState and returns its pointer.
@@ -83,6 +87,7 @@ func (c *CycleState) Clone() *CycleState {
 		return true
 	})
 	copy.recordPluginMetrics = c.recordPluginMetrics
+	copy.SkipFilterPlugins = c.SkipFilterPlugins
 
 	return copy
 }

pkg/scheduler/framework/interface.go

@@ -91,6 +91,7 @@ const (
 	// Wait is used when a Permit plugin finds a pod scheduling should wait.
 	Wait
 	// Skip is used when a Bind plugin chooses to skip binding.
+	// Also, if a PreFilter plugin returns Skip, coupled Filter plugin will be skipped.
 	Skip
 )
 

pkg/scheduler/framework/runtime/framework.go

@@ -592,8 +592,10 @@ func (f *frameworkImpl) QueueSortFunc() framework.LessFunc {
 
 // 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. If a non-success status is returned, then the scheduling
+// anything but Success/Skip.
-// cycle is aborted.
+// Plugins that returned Skip status are recorded in the cyclestate,
+// and they are skipped in the Filter extension point.
+// 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()
 	defer func() {
@@ -601,15 +603,19 @@ func (f *frameworkImpl) RunPreFilterPlugins(ctx context.Context, state *framewor
 	}()
 	var result *framework.PreFilterResult
 	var pluginsWithNodes []string
+	skipPlugins := sets.NewString()
 	for _, pl := range f.preFilterPlugins {
 		r, s := f.runPreFilterPlugin(ctx, pl, state, pod)
-		if !s.IsSuccess() {
+		if !s.IsSuccess() && !s.IsSkip() {
 			s.SetFailedPlugin(pl.Name())
 			if s.IsUnschedulable() {
 				return nil, s
 			}
 			return nil, framework.AsStatus(fmt.Errorf("running PreFilter plugin %q: %w", pl.Name(), s.AsError())).WithFailedPlugin(pl.Name())
 		}
+		if s.IsSkip() {
+			skipPlugins.Insert(pl.Name())
+		}
 		if !r.AllNodes() {
 			pluginsWithNodes = append(pluginsWithNodes, pl.Name())
 		}
@@ -621,8 +627,8 @@ func (f *frameworkImpl) RunPreFilterPlugins(ctx context.Context, state *framewor
 			}
 			return nil, framework.NewStatus(framework.Unschedulable, msg)
 		}
-
 	}
+	state.SkipFilterPlugins = skipPlugins
 	return result, nil
 }
 
@@ -716,8 +722,12 @@ func (f *frameworkImpl) RunFilterPlugins(
 	pod *v1.Pod,
 	nodeInfo *framework.NodeInfo,
 ) framework.PluginToStatus {
+	skippedPlugins := state.SkipFilterPlugins
 	statuses := make(framework.PluginToStatus)
 	for _, pl := range f.filterPlugins {
+		if skippedPlugins.Has(pl.Name()) {
+			continue
+		}
 		pluginStatus := f.runFilterPlugin(ctx, pl, state, pod, nodeInfo)
 		if !pluginStatus.IsSuccess() {
 			if !pluginStatus.IsUnschedulable() {

pkg/scheduler/framework/runtime/framework_test.go

@@ -1325,7 +1325,7 @@ func TestPreFilterPlugins(t *testing.T) {
 		if err != nil {
 			t.Fatalf("Failed to create framework for testing: %v", err)
 		}
-		f.RunPreFilterPlugins(ctx, nil, nil)
+		f.RunPreFilterPlugins(ctx, framework.NewCycleState(), nil)
 		f.RunPreFilterExtensionAddPod(ctx, nil, nil, nil, nil)
 		f.RunPreFilterExtensionRemovePod(ctx, nil, nil, nil, nil)
 
@@ -1344,40 +1344,152 @@ func TestPreFilterPlugins(t *testing.T) {
 	})
 }
 
-func TestRunPreFilterPluginsStatus(t *testing.T) {
+func TestRunPreFilterPlugins(t *testing.T) {
-	preFilter := &TestPlugin{
+	tests := []struct {
-		name: preFilterPluginName,
+		name                string
-		inj:  injectedResult{PreFilterStatus: int(framework.Error)},
+		plugins             []*TestPlugin
+		wantPreFilterResult *framework.PreFilterResult
+		wantSkippedPlugins  sets.String
+		wantStatus          *framework.Status
+	}{
+		{
+			name: "all PreFilter returned success",
+			plugins: []*TestPlugin{
+				{
+					name: "success1",
+				},
+				{
+					name: "success2",
+				},
+			},
+			wantPreFilterResult: nil,
+			wantStatus:          nil,
+		},
+		{
+			name: "one PreFilter plugin returned success, but another PreFilter plugin returned non-success",
+			plugins: []*TestPlugin{
+				{
+					name: "success",
+				},
+				{
+					name: "error",
+					inj:  injectedResult{PreFilterStatus: int(framework.Error)},
+				},
+			},
+			wantPreFilterResult: nil,
+			wantStatus:          framework.AsStatus(fmt.Errorf("running PreFilter plugin %q: %w", "error", errInjectedStatus)).WithFailedPlugin("error"),
+		},
+		{
+			name: "one PreFilter plugin returned skip, but another PreFilter plugin returned non-success",
+			plugins: []*TestPlugin{
+				{
+					name: "skip",
+					inj:  injectedResult{PreFilterStatus: int(framework.Skip)},
+				},
+				{
+					name: "error",
+					inj:  injectedResult{PreFilterStatus: int(framework.Error)},
+				},
+			},
+			wantPreFilterResult: nil,
+			wantStatus:          framework.AsStatus(fmt.Errorf("running PreFilter plugin %q: %w", "error", errInjectedStatus)).WithFailedPlugin("error"),
+		},
+		{
+			name: "all PreFilter plugins returned skip",
+			plugins: []*TestPlugin{
+				{
+					name: "skip1",
+					inj:  injectedResult{PreFilterStatus: int(framework.Skip)},
+				},
+				{
+					name: "skip2",
+					inj:  injectedResult{PreFilterStatus: int(framework.Skip)},
+				},
+				{
+					name: "skip3",
+					inj:  injectedResult{PreFilterStatus: int(framework.Skip)},
+				},
+			},
+			wantPreFilterResult: nil,
+			wantSkippedPlugins:  sets.NewString("skip1", "skip2", "skip3"),
+			wantStatus:          nil,
+		},
+		{
+			name: "some PreFilter plugins returned skip",
+			plugins: []*TestPlugin{
+				{
+					name: "skip1",
+					inj:  injectedResult{PreFilterStatus: int(framework.Skip)},
+				},
+				{
+					name: "success1",
+				},
+				{
+					name: "skip2",
+					inj:  injectedResult{PreFilterStatus: int(framework.Skip)},
+				},
+				{
+					name: "success2",
+				},
+			},
+			wantPreFilterResult: nil,
+			wantSkippedPlugins:  sets.NewString("skip1", "skip2"),
+			wantStatus:          nil,
+		},
 	}
-	r := make(Registry)
+	for _, tt := range tests {
-	r.Register(preFilterPluginName,
+		t.Run(tt.name, func(t *testing.T) {
-		func(_ runtime.Object, fh framework.Handle) (framework.Plugin, error) {
+			r := make(Registry)
-			return preFilter, nil
+			enabled := make([]config.Plugin, len(tt.plugins))
+			for i, p := range tt.plugins {
+				p := p
+				enabled[i].Name = p.name
+				r.Register(p.name, func(_ runtime.Object, fh framework.Handle) (framework.Plugin, error) {
+					return p, nil
+				})
+			}
+
+			ctx, cancel := context.WithCancel(context.Background())
+			defer cancel()
+
+			f, err := newFrameworkWithQueueSortAndBind(
+				r,
+				config.KubeSchedulerProfile{Plugins: &config.Plugins{PreFilter: config.PluginSet{Enabled: enabled}}},
+				ctx.Done(),
+			)
+			if err != nil {
+				t.Fatalf("Failed to create framework for testing: %v", err)
+			}
+
+			state := framework.NewCycleState()
+			result, status := f.RunPreFilterPlugins(ctx, state, nil)
+			if d := cmp.Diff(result, tt.wantPreFilterResult); d != "" {
+				t.Errorf("wrong status. got: %v, want: %v, diff: %s", result, tt.wantPreFilterResult, d)
+			}
+			if d := cmp.Diff(status, tt.wantStatus, cmp.Comparer(func(a, b *framework.Status) bool {
+				if a.Code() == framework.Error && b.Code() == framework.Error {
+					// we assume two error status is equal to each other if both contain the same reasons.
+					return cmp.Equal(a.Reasons(), b.Reasons())
+				}
+				return a.Equal(b)
+			})); d != "" {
+				t.Errorf("wrong status. got: %v, want: %v, diff: %s", status, tt.wantStatus, d)
+			}
+			skipped := state.SkipFilterPlugins
+			if d := cmp.Diff(skipped, tt.wantSkippedPlugins); d != "" {
+				t.Errorf("wrong skip filter plugins. got: %v, want: %v, diff: %s", skipped, tt.wantSkippedPlugins, d)
+			}
 		})
-
-	plugins := &config.Plugins{PreFilter: config.PluginSet{Enabled: []config.Plugin{{Name: preFilterPluginName}}}}
-
-	profile := config.KubeSchedulerProfile{Plugins: plugins}
-	ctx, cancel := context.WithCancel(context.Background())
-	defer cancel()
-
-	f, err := newFrameworkWithQueueSortAndBind(r, profile, ctx.Done())
-	if err != nil {
-		t.Fatalf("Failed to create framework for testing: %v", err)
-	}
-	_, status := f.RunPreFilterPlugins(ctx, nil, nil)
-	wantStatus := framework.AsStatus(fmt.Errorf("running PreFilter plugin %q: %w", preFilter.Name(), errInjectedStatus)).WithFailedPlugin(preFilter.Name())
-	if !reflect.DeepEqual(status, wantStatus) {
-		t.Errorf("wrong status. got: %v, want:%v", status, wantStatus)
 	}
 }
 
 func TestFilterPlugins(t *testing.T) {
 	tests := []struct {
-		name          string
+		name           string
-		plugins       []*TestPlugin
+		plugins        []*TestPlugin
-		wantStatus    *framework.Status
+		skippedPlugins sets.String
-		wantStatusMap framework.PluginToStatus
+		wantStatus     *framework.Status
+		wantStatusMap  framework.PluginToStatus
 	}{
 		{
 			name: "SuccessFilter",
@@ -1387,7 +1499,6 @@ func TestFilterPlugins(t *testing.T) {
 					inj:  injectedResult{FilterStatus: int(framework.Success)},
 				},
 			},
-			wantStatus:    nil,
 			wantStatusMap: framework.PluginToStatus{},
 		},
 		{
@@ -1465,6 +1576,23 @@ func TestFilterPlugins(t *testing.T) {
 			wantStatus:    nil,
 			wantStatusMap: framework.PluginToStatus{},
 		},
+		{
+			name: "SuccessAndSkipFilters",
+			plugins: []*TestPlugin{
+				{
+					name: "TestPlugin1",
+					inj:  injectedResult{FilterStatus: int(framework.Success)},
+				},
+
+				{
+					name: "TestPlugin2",
+					inj:  injectedResult{FilterStatus: int(framework.Error)}, // To make sure this plugins isn't called, set error as an injected result.
+				},
+			},
+			wantStatus:     nil,
+			skippedPlugins: sets.NewString("TestPlugin2"),
+			wantStatusMap:  framework.PluginToStatus{},
+		},
 		{
 			name: "ErrorAndSuccessFilters",
 			plugins: []*TestPlugin{
@@ -1545,7 +1673,9 @@ func TestFilterPlugins(t *testing.T) {
 			if err != nil {
 				t.Fatalf("fail to create framework: %s", err)
 			}
-			gotStatusMap := f.RunFilterPlugins(ctx, nil, pod, nil)
+			state := framework.NewCycleState()
+			state.SkipFilterPlugins = tt.skippedPlugins
+			gotStatusMap := f.RunFilterPlugins(ctx, state, pod, nil)
 			gotStatus := gotStatusMap.Merge()
 			if !reflect.DeepEqual(gotStatus, tt.wantStatus) {
 				t.Errorf("wrong status code. got: %v, want:%v", gotStatus, tt.wantStatus)
@@ -1779,7 +1909,7 @@ func TestFilterPluginsWithNominatedPods(t *testing.T) {
 				t.Fatalf("fail to create framework: %s", err)
 			}
 			tt.nodeInfo.SetNode(tt.node)
-			gotStatus := f.RunFilterPluginsWithNominatedPods(ctx, nil, tt.pod, tt.nodeInfo)
+			gotStatus := f.RunFilterPluginsWithNominatedPods(ctx, framework.NewCycleState(), tt.pod, tt.nodeInfo)
 			if !reflect.DeepEqual(gotStatus, tt.wantStatus) {
 				t.Errorf("Unexpected status. got: %v, want: %v", gotStatus, tt.wantStatus)
 			}