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EvenPodsSpread: Preemption UT on generic_scheduler
This commit is contained in:
Wei Huang
parent
ff831c3df2
commit
2027525abf
@ -553,11 +553,9 @@ func TestGenericScheduler(t *testing.T) {
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pvcLister := schedulertesting.FakePersistentVolumeClaimLister(pvcs)
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var predMetaProducer algorithmpredicates.PredicateMetadataProducer
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predMetaProducer := algorithmpredicates.EmptyPredicateMetadataProducer
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if test.buildPredMeta {
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predMetaProducer = algorithmpredicates.NewPredicateMetadataFactory(schedulertesting.FakePodLister(test.pods))
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} else {
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predMetaProducer = algorithmpredicates.EmptyPredicateMetadataProducer
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}
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scheduler := NewGenericScheduler(
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cache,
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@ -1083,7 +1081,83 @@ func TestSelectNodesForPreemption(t *testing.T) {
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expected: map[string]map[string]bool{"machine1": {"a": true}, "machine2": {}},
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addAffinityPredicate: true,
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},
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{
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name: "preemption to resolve even pods spread FitError",
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predicates: map[string]algorithmpredicates.FitPredicate{
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"matches": algorithmpredicates.EvenPodsSpreadPredicate,
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},
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nodes: []string{"node-a/zone1", "node-b/zone1", "node-x/zone2"},
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pod: &v1.Pod{
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ObjectMeta: metav1.ObjectMeta{
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Name: "p",
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Labels: map[string]string{"foo": ""},
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},
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Spec: v1.PodSpec{
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Priority: &highPriority,
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TopologySpreadConstraints: []v1.TopologySpreadConstraint{
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{
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MaxSkew: 1,
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TopologyKey: "zone",
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WhenUnsatisfiable: v1.DoNotSchedule,
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LabelSelector: &metav1.LabelSelector{
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MatchExpressions: []metav1.LabelSelectorRequirement{
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{
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Key: "foo",
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Operator: metav1.LabelSelectorOpExists,
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},
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},
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},
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},
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{
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MaxSkew: 1,
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TopologyKey: "hostname",
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WhenUnsatisfiable: v1.DoNotSchedule,
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LabelSelector: &metav1.LabelSelector{
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MatchExpressions: []metav1.LabelSelectorRequirement{
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{
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Key: "foo",
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Operator: metav1.LabelSelectorOpExists,
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},
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},
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},
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},
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},
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},
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},
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pods: []*v1.Pod{
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{
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ObjectMeta: metav1.ObjectMeta{Name: "pod-a1", UID: types.UID("pod-a1"), Labels: map[string]string{"foo": ""}},
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Spec: v1.PodSpec{NodeName: "node-a", Priority: &midPriority},
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Status: v1.PodStatus{Phase: v1.PodRunning},
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},
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{
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ObjectMeta: metav1.ObjectMeta{Name: "pod-a2", UID: types.UID("pod-a2"), Labels: map[string]string{"foo": ""}},
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Spec: v1.PodSpec{NodeName: "node-a", Priority: &lowPriority},
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Status: v1.PodStatus{Phase: v1.PodRunning},
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},
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{
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ObjectMeta: metav1.ObjectMeta{Name: "pod-b1", UID: types.UID("pod-b1"), Labels: map[string]string{"foo": ""}},
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Spec: v1.PodSpec{NodeName: "node-b", Priority: &lowPriority},
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Status: v1.PodStatus{Phase: v1.PodRunning},
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},
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{
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ObjectMeta: metav1.ObjectMeta{Name: "pod-x1", UID: types.UID("pod-x1"), Labels: map[string]string{"foo": ""}},
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Spec: v1.PodSpec{NodeName: "node-x", Priority: &highPriority},
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Status: v1.PodStatus{Phase: v1.PodRunning},
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},
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{
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ObjectMeta: metav1.ObjectMeta{Name: "pod-x2", UID: types.UID("pod-x2"), Labels: map[string]string{"foo": ""}},
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Spec: v1.PodSpec{NodeName: "node-x", Priority: &highPriority},
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Status: v1.PodStatus{Phase: v1.PodRunning},
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},
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},
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expected: map[string]map[string]bool{
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"node-a": {"pod-a2": true},
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"node-b": {"pod-b1": true},
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},
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},
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}
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labelKeys := []string{"hostname", "zone", "region"}
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for _, test := range tests {
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t.Run(test.name, func(t *testing.T) {
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assignDefaultStartTime(test.pods)
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@ -1091,7 +1165,13 @@ func TestSelectNodesForPreemption(t *testing.T) {
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nodes := []*v1.Node{}
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for _, n := range test.nodes {
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node := makeNode(n, 1000*5, priorityutil.DefaultMemoryRequest*5)
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node.ObjectMeta.Labels = map[string]string{"hostname": node.Name}
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// if possible, split node name by '/' to form labels in a format of
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// {"hostname": node.Name[0], "zone": node.Name[1], "region": node.Name[2]}
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node.ObjectMeta.Labels = make(map[string]string)
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for i, label := range strings.Split(node.Name, "/") {
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node.ObjectMeta.Labels[labelKeys[i]] = label
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}
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node.Name = node.ObjectMeta.Labels["hostname"]
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nodes = append(nodes, node)
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}
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if test.addAffinityPredicate {
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@ -1416,6 +1496,15 @@ func TestNodesWherePreemptionMightHelp(t *testing.T) {
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},
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expected: map[string]bool{"machine4": true},
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},
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{
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name: "ErrTopologySpreadConstraintsNotMatch should be tried as it indicates that the pod is unschedulable due to topology spread constraints",
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failedPredMap: FailedPredicateMap{
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"machine1": []algorithmpredicates.PredicateFailureReason{algorithmpredicates.ErrTopologySpreadConstraintsNotMatch},
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"machine2": []algorithmpredicates.PredicateFailureReason{algorithmpredicates.ErrPodNotMatchHostName},
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"machine3": []algorithmpredicates.PredicateFailureReason{algorithmpredicates.ErrTopologySpreadConstraintsNotMatch},
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},
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expected: map[string]bool{"machine1": true, "machine3": true, "machine4": true},
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},
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}
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for _, test := range tests {
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@ -1435,27 +1524,31 @@ func TestNodesWherePreemptionMightHelp(t *testing.T) {
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func TestPreempt(t *testing.T) {
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defer algorithmpredicates.SetPredicatesOrderingDuringTest(order)()
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failedPredMap := FailedPredicateMap{
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defaultFailedPredMap := FailedPredicateMap{
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"machine1": []algorithmpredicates.PredicateFailureReason{algorithmpredicates.NewInsufficientResourceError(v1.ResourceMemory, 1000, 500, 300)},
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"machine2": []algorithmpredicates.PredicateFailureReason{algorithmpredicates.ErrDiskConflict},
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"machine3": []algorithmpredicates.PredicateFailureReason{algorithmpredicates.NewInsufficientResourceError(v1.ResourceMemory, 1000, 600, 400)},
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}
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// Prepare 3 node names.
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nodeNames := []string{}
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defaultNodeNames := []string{}
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for i := 1; i < 4; i++ {
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nodeNames = append(nodeNames, fmt.Sprintf("machine%d", i))
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defaultNodeNames = append(defaultNodeNames, fmt.Sprintf("machine%d", i))
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}
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var (
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preemptLowerPriority = v1.PreemptLowerPriority
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preemptNever = v1.PreemptNever
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)
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tests := []struct {
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name string
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pod *v1.Pod
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pods []*v1.Pod
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extenders []*FakeExtender
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expectedNode string
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expectedPods []string // list of preempted pods
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name string
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pod *v1.Pod
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pods []*v1.Pod
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extenders []*FakeExtender
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failedPredMap FailedPredicateMap
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nodeNames []string
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predicate algorithmpredicates.FitPredicate
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buildPredMeta bool
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expectedNode string
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expectedPods []string // list of preempted pods
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}{
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{
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name: "basic preemption logic",
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@ -1489,6 +1582,83 @@ func TestPreempt(t *testing.T) {
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expectedNode: "machine3",
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expectedPods: []string{},
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},
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{
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name: "preemption for topology spread constraints",
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pod: &v1.Pod{
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ObjectMeta: metav1.ObjectMeta{
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Name: "p",
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Labels: map[string]string{"foo": ""},
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},
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Spec: v1.PodSpec{
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Priority: &highPriority,
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TopologySpreadConstraints: []v1.TopologySpreadConstraint{
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{
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MaxSkew: 1,
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TopologyKey: "zone",
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WhenUnsatisfiable: v1.DoNotSchedule,
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LabelSelector: &metav1.LabelSelector{
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MatchExpressions: []metav1.LabelSelectorRequirement{
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{
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Key: "foo",
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Operator: metav1.LabelSelectorOpExists,
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},
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},
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},
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},
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{
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MaxSkew: 1,
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TopologyKey: "hostname",
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WhenUnsatisfiable: v1.DoNotSchedule,
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LabelSelector: &metav1.LabelSelector{
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MatchExpressions: []metav1.LabelSelectorRequirement{
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{
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Key: "foo",
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Operator: metav1.LabelSelectorOpExists,
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},
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},
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},
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},
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},
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},
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},
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pods: []*v1.Pod{
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{
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ObjectMeta: metav1.ObjectMeta{Name: "pod-a1", UID: types.UID("pod-a1"), Labels: map[string]string{"foo": ""}},
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Spec: v1.PodSpec{NodeName: "node-a", Priority: &highPriority},
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Status: v1.PodStatus{Phase: v1.PodRunning},
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},
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{
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ObjectMeta: metav1.ObjectMeta{Name: "pod-a2", UID: types.UID("pod-a2"), Labels: map[string]string{"foo": ""}},
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Spec: v1.PodSpec{NodeName: "node-a", Priority: &highPriority},
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Status: v1.PodStatus{Phase: v1.PodRunning},
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},
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{
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ObjectMeta: metav1.ObjectMeta{Name: "pod-b1", UID: types.UID("pod-b1"), Labels: map[string]string{"foo": ""}},
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Spec: v1.PodSpec{NodeName: "node-b", Priority: &lowPriority},
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Status: v1.PodStatus{Phase: v1.PodRunning},
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},
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{
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ObjectMeta: metav1.ObjectMeta{Name: "pod-x1", UID: types.UID("pod-x1"), Labels: map[string]string{"foo": ""}},
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Spec: v1.PodSpec{NodeName: "node-x", Priority: &highPriority},
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Status: v1.PodStatus{Phase: v1.PodRunning},
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},
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{
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ObjectMeta: metav1.ObjectMeta{Name: "pod-x2", UID: types.UID("pod-x2"), Labels: map[string]string{"foo": ""}},
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Spec: v1.PodSpec{NodeName: "node-x", Priority: &highPriority},
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Status: v1.PodStatus{Phase: v1.PodRunning},
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},
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},
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failedPredMap: FailedPredicateMap{
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"node-a": []algorithmpredicates.PredicateFailureReason{algorithmpredicates.ErrTopologySpreadConstraintsNotMatch},
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"node-b": []algorithmpredicates.PredicateFailureReason{algorithmpredicates.ErrTopologySpreadConstraintsNotMatch},
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"node-x": []algorithmpredicates.PredicateFailureReason{algorithmpredicates.ErrTopologySpreadConstraintsNotMatch},
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},
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predicate: algorithmpredicates.EvenPodsSpreadPredicate,
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buildPredMeta: true,
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nodeNames: []string{"node-a/zone1", "node-b/zone1", "node-x/zone2"},
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expectedNode: "node-b",
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expectedPods: []string{"pod-b1"},
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},
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{
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name: "Scheduler extenders allow only machine1, otherwise machine3 would have been chosen",
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pod: &v1.Pod{ObjectMeta: metav1.ObjectMeta{Name: "pod1", UID: types.UID("pod1")}, Spec: v1.PodSpec{
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@ -1618,6 +1788,7 @@ func TestPreempt(t *testing.T) {
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},
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}
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labelKeys := []string{"hostname", "zone", "region"}
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for _, test := range tests {
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t.Run(test.name, func(t *testing.T) {
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t.Logf("===== Running test %v", t.Name())
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@ -1627,14 +1798,26 @@ func TestPreempt(t *testing.T) {
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cache.AddPod(pod)
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}
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cachedNodeInfoMap := map[string]*schedulernodeinfo.NodeInfo{}
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for _, name := range nodeNames {
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nodeNames := defaultNodeNames
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if len(test.nodeNames) != 0 {
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nodeNames = test.nodeNames
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}
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for i, name := range nodeNames {
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node := makeNode(name, 1000*5, priorityutil.DefaultMemoryRequest*5)
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// if possible, split node name by '/' to form labels in a format of
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// {"hostname": node.Name[0], "zone": node.Name[1], "region": node.Name[2]}
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node.ObjectMeta.Labels = make(map[string]string)
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for i, label := range strings.Split(node.Name, "/") {
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node.ObjectMeta.Labels[labelKeys[i]] = label
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}
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node.Name = node.ObjectMeta.Labels["hostname"]
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cache.AddNode(node)
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nodeNames[i] = node.Name
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// Set nodeInfo to extenders to mock extenders' cache for preemption.
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cachedNodeInfo := schedulernodeinfo.NewNodeInfo()
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cachedNodeInfo.SetNode(node)
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cachedNodeInfoMap[name] = cachedNodeInfo
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cachedNodeInfoMap[node.Name] = cachedNodeInfo
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}
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extenders := []algorithm.SchedulerExtender{}
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for _, extender := range test.extenders {
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@ -1642,11 +1825,19 @@ func TestPreempt(t *testing.T) {
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extender.cachedNodeNameToInfo = cachedNodeInfoMap
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extenders = append(extenders, extender)
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}
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predicate := algorithmpredicates.PodFitsResources
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if test.predicate != nil {
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predicate = test.predicate
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}
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predMetaProducer := algorithmpredicates.EmptyPredicateMetadataProducer
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if test.buildPredMeta {
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predMetaProducer = algorithmpredicates.NewPredicateMetadataFactory(schedulertesting.FakePodLister(test.pods))
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}
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scheduler := NewGenericScheduler(
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cache,
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internalqueue.NewSchedulingQueue(nil, nil),
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map[string]algorithmpredicates.FitPredicate{"matches": algorithmpredicates.PodFitsResources},
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algorithmpredicates.EmptyPredicateMetadataProducer,
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map[string]algorithmpredicates.FitPredicate{"matches": predicate},
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predMetaProducer,
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[]priorities.PriorityConfig{{Function: numericPriority, Weight: 1}},
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priorities.EmptyPriorityMetadataProducer,
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emptyFramework,
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@ -1660,6 +1851,10 @@ func TestPreempt(t *testing.T) {
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true)
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scheduler.(*genericScheduler).snapshot()
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// Call Preempt and check the expected results.
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failedPredMap := defaultFailedPredMap
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if test.failedPredMap != nil {
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failedPredMap = test.failedPredMap
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}
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node, victims, _, err := scheduler.Preempt(test.pod, schedulertesting.FakeNodeLister(makeNodeList(nodeNames)), error(&FitError{Pod: test.pod, FailedPredicates: failedPredMap}))
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if err != nil {
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t.Errorf("unexpected error in preemption: %v", err)
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