clarify pridicates message when no nodes available

plugin/pkg/scheduler/core/generic_scheduler.go

@@ -42,13 +42,14 @@ type FailedPredicateMap map[string][]algorithm.PredicateFailureReason
 
 type FitError struct {
 	Pod              *v1.Pod
+	NumAllNodes      int
 	FailedPredicates FailedPredicateMap
 }
 
 var ErrNoNodesAvailable = fmt.Errorf("no nodes available to schedule pods")
 
 const (
-	NoNodeAvailableMsg = "No nodes are available that match all of the predicates"
+	NoNodeAvailableMsg = "0/%v nodes are available"
 	// NominatedNodeAnnotationKey is used to annotate a pod that has preempted other pods.
 	// The scheduler uses the annotation to find that the pod shouldn't preempt more pods
 	// when it gets to the head of scheduling queue again.
@@ -68,12 +69,12 @@ func (f *FitError) Error() string {
 	sortReasonsHistogram := func() []string {
 		reasonStrings := []string{}
 		for k, v := range reasons {
-			reasonStrings = append(reasonStrings, fmt.Sprintf("%v (%v)", k, v))
+			reasonStrings = append(reasonStrings, fmt.Sprintf("%v %v", v, k))
 		}
 		sort.Strings(reasonStrings)
 		return reasonStrings
 	}
-	reasonMsg := fmt.Sprintf(NoNodeAvailableMsg+": %v.", strings.Join(sortReasonsHistogram(), ", "))
+	reasonMsg := fmt.Sprintf(NoNodeAvailableMsg+": %v.", f.NumAllNodes, strings.Join(sortReasonsHistogram(), ", "))
 	return reasonMsg
 }
 
@@ -122,6 +123,7 @@ func (g *genericScheduler) Schedule(pod *v1.Pod, nodeLister algorithm.NodeLister
 	if len(filteredNodes) == 0 {
 		return "", &FitError{
 			Pod:              pod,
+			NumAllNodes:      len(nodes),
 			FailedPredicates: failedPredicateMap,
 		}
 	}

plugin/pkg/scheduler/core/generic_scheduler_test.go

@@ -201,6 +201,7 @@ func TestGenericScheduler(t *testing.T) {
 			name:         "test 1",
 			wErr: &FitError{
 				Pod:         &v1.Pod{ObjectMeta: metav1.ObjectMeta{Name: "2"}},
+				NumAllNodes: 2,
 				FailedPredicates: FailedPredicateMap{
 					"machine1": []algorithm.PredicateFailureReason{algorithmpredicates.ErrFakePredicate},
 					"machine2": []algorithm.PredicateFailureReason{algorithmpredicates.ErrFakePredicate},
@@ -261,6 +262,7 @@ func TestGenericScheduler(t *testing.T) {
 			name:         "test 7",
 			wErr: &FitError{
 				Pod:         &v1.Pod{ObjectMeta: metav1.ObjectMeta{Name: "2"}},
+				NumAllNodes: 3,
 				FailedPredicates: FailedPredicateMap{
 					"3": []algorithm.PredicateFailureReason{algorithmpredicates.ErrFakePredicate},
 					"2": []algorithm.PredicateFailureReason{algorithmpredicates.ErrFakePredicate},
@@ -291,6 +293,7 @@ func TestGenericScheduler(t *testing.T) {
 			name:         "test 8",
 			wErr: &FitError{
 				Pod:         &v1.Pod{ObjectMeta: metav1.ObjectMeta{Name: "2"}},
+				NumAllNodes: 2,
 				FailedPredicates: FailedPredicateMap{
 					"1": []algorithm.PredicateFailureReason{algorithmpredicates.ErrFakePredicate},
 					"2": []algorithm.PredicateFailureReason{algorithmpredicates.ErrFakePredicate},
@@ -407,14 +410,15 @@ func makeNode(node string, milliCPU, memory int64) *v1.Node {
 func TestHumanReadableFitError(t *testing.T) {
 	err := &FitError{
 		Pod:         &v1.Pod{ObjectMeta: metav1.ObjectMeta{Name: "2"}},
+		NumAllNodes: 3,
 		FailedPredicates: FailedPredicateMap{
 			"1": []algorithm.PredicateFailureReason{algorithmpredicates.ErrNodeUnderMemoryPressure},
 			"2": []algorithm.PredicateFailureReason{algorithmpredicates.ErrNodeUnderDiskPressure},
 			"3": []algorithm.PredicateFailureReason{algorithmpredicates.ErrNodeUnderDiskPressure},
 		},
 	}
-	if strings.Contains(err.Error(), NoNodeAvailableMsg) {
-		if strings.Contains(err.Error(), "NodeUnderDiskPressure (2)") && strings.Contains(err.Error(), "NodeUnderMemoryPressure (1)") {
+	if strings.Contains(err.Error(), "0/3 nodes are available") {
+		if strings.Contains(err.Error(), "2 NodeUnderDiskPressure") && strings.Contains(err.Error(), "1 NodeUnderMemoryPressure") {
 			return
 		}
 	}
@@ -1180,7 +1184,7 @@ func TestPreempt(t *testing.T) {
 		scheduler := NewGenericScheduler(
 			cache, nil, map[string]algorithm.FitPredicate{"matches": algorithmpredicates.PodFitsResources}, algorithm.EmptyPredicateMetadataProducer, []algorithm.PriorityConfig{{Function: numericPriority, Weight: 1}}, algorithm.EmptyMetadataProducer, extenders)
 		// Call Preempt and check the expected results.
-		node, victims, err := scheduler.Preempt(test.pod, schedulertesting.FakeNodeLister(makeNodeList(nodeNames)), error(&FitError{test.pod, failedPredMap}))
+		node, victims, err := scheduler.Preempt(test.pod, schedulertesting.FakeNodeLister(makeNodeList(nodeNames)), error(&FitError{Pod: test.pod, FailedPredicates: failedPredMap}))
 		if err != nil {
 			t.Errorf("test [%v]: unexpected error in preemption: %v", test.name, err)
 		}
@@ -1208,7 +1212,7 @@ func TestPreempt(t *testing.T) {
 			test.pod.Annotations[NominatedNodeAnnotationKey] = node.Name
 		}
 		// Call preempt again and make sure it doesn't preempt any more pods.
-		node, victims, err = scheduler.Preempt(test.pod, schedulertesting.FakeNodeLister(makeNodeList(nodeNames)), error(&FitError{test.pod, failedPredMap}))
+		node, victims, err = scheduler.Preempt(test.pod, schedulertesting.FakeNodeLister(makeNodeList(nodeNames)), error(&FitError{Pod: test.pod, FailedPredicates: failedPredMap}))
 		if err != nil {
 			t.Errorf("test [%v]: unexpected error in preemption: %v", test.name, err)
 		}

plugin/pkg/scheduler/scheduler_test.go

@@ -300,6 +300,7 @@ func TestSchedulerNoPhantomPodAfterDelete(t *testing.T) {
 	case err := <-errChan:
 		expectErr := &core.FitError{
 			Pod:              secondPod,
+			NumAllNodes:      1,
 			FailedPredicates: core.FailedPredicateMap{node.Name: []algorithm.PredicateFailureReason{predicates.ErrPodNotFitsHostPorts}},
 		}
 		if !reflect.DeepEqual(expectErr, err) {
@@ -484,6 +485,7 @@ func TestSchedulerFailedSchedulingReasons(t *testing.T) {
 	case err := <-errChan:
 		expectErr := &core.FitError{
 			Pod:              podWithTooBigResourceRequests,
+			NumAllNodes:      len(nodes),
 			FailedPredicates: failedPredicatesMap,
 		}
 		if len(fmt.Sprint(expectErr)) > 150 {