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Added a NodeAffinity PreFilter that looks for node.Name MatchField terms; if exist, the pod is only evaluated against the matching nodes.

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This commit is contained in:
Abdullah Gharaibeh 2022-03-14 15:37:03 -04:00
parent 5b20b68bc9
commit da7f085dcb
2 changed files with 158 additions and 35 deletions
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48
pkg/scheduler/framework/plugins/nodeaffinity/node_affinity.go
View File

@ -20,8 +20,10 @@ import (
"context"
"fmt"
v1 "k8s.io/api/core/v1"
"k8s.io/api/core/v1"
metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
"k8s.io/apimachinery/pkg/runtime"
"k8s.io/apimachinery/pkg/util/sets"
"k8s.io/component-helpers/scheduling/corev1/nodeaffinity"
"k8s.io/kubernetes/pkg/scheduler/apis/config"
"k8s.io/kubernetes/pkg/scheduler/apis/config/validation"
@ -58,6 +60,9 @@ const (
// errReasonEnforced is the reason for added node affinity not matching.
errReasonEnforced = "node(s) didn't match scheduler-enforced node affinity"
// errReasonConflict is the reason for pod's conflicting affinity rules.
errReasonConflict = "pod affinity terms conflict"
)
// Name returns name of the plugin. It is used in logs, etc.
@ -86,7 +91,48 @@ func (pl *NodeAffinity) EventsToRegister() []framework.ClusterEvent {
func (pl *NodeAffinity) PreFilter(ctx context.Context, cycleState *framework.CycleState, pod *v1.Pod) (*framework.PreFilterResult, *framework.Status) {
state := &preFilterState{requiredNodeSelectorAndAffinity: nodeaffinity.GetRequiredNodeAffinity(pod)}
cycleState.Write(preFilterStateKey, state)
affinity := pod.Spec.Affinity
if affinity == nil ||
affinity.NodeAffinity == nil ||
affinity.NodeAffinity.RequiredDuringSchedulingIgnoredDuringExecution == nil ||
len(affinity.NodeAffinity.RequiredDuringSchedulingIgnoredDuringExecution.NodeSelectorTerms) == 0 {
return nil, nil
}
// Check if there is affinity to a specific node and return it.
terms := affinity.NodeAffinity.RequiredDuringSchedulingIgnoredDuringExecution.NodeSelectorTerms
var nodeNames sets.String
for _, t := range terms {
var termNodeNames sets.String
for _, r := range t.MatchFields {
if r.Key == metav1.ObjectNameField && r.Operator == v1.NodeSelectorOpIn {
// The requirements represent ANDed constraints, and so we need to
// find the intersection of nodes.
s := sets.NewString(r.Values...)
if termNodeNames == nil {
termNodeNames = s
} else {
termNodeNames = termNodeNames.Intersection(s)
}
}
}
if termNodeNames == nil {
// If this term has no node.Name field affinity,
// then all nodes are eligible because the terms are ORed.
return nil, nil
}
// If the set is empty, it means the terms had affinity to different
// sets of nodes, and since they are ANDed, then the pod will not match any node.
if len(termNodeNames) == 0 {
return nil, framework.NewStatus(framework.UnschedulableAndUnresolvable, errReasonConflict)
}
nodeNames = nodeNames.Union(termNodeNames)
}
if nodeNames != nil {
return &framework.PreFilterResult{NodeNames: nodeNames}, nil
}
return nil, nil
}
// PreFilterExtensions not necessary for this plugin as state doesn't depend on pod additions or deletions.

145
pkg/scheduler/framework/plugins/nodeaffinity/node_affinity_test.go
View File

@ -18,12 +18,12 @@ package nodeaffinity
import (
"context"
"reflect"
"testing"
"github.com/google/go-cmp/cmp"
v1 "k8s.io/api/core/v1"
metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
"k8s.io/apimachinery/pkg/util/sets"
"k8s.io/kubernetes/pkg/scheduler/apis/config"
"k8s.io/kubernetes/pkg/scheduler/framework"
"k8s.io/kubernetes/pkg/scheduler/framework/runtime"
@ -33,13 +33,15 @@ import (
// TODO: Add test case for RequiredDuringSchedulingRequiredDuringExecution after it's implemented.
func TestNodeAffinity(t *testing.T) {
tests := []struct {
name string
pod *v1.Pod
labels map[string]string
nodeName string
wantStatus *framework.Status
args config.NodeAffinityArgs
disablePreFilter bool
name string
pod *v1.Pod
labels map[string]string
nodeName string
wantStatus *framework.Status
wantPreFilterStatus *framework.Status
wantPreFilterResult *framework.PreFilterResult
args config.NodeAffinityArgs
disablePreFilter bool
}{
{
name: "no selector",
@ -513,7 +515,7 @@ func TestNodeAffinity(t *testing.T) {
{
Key: metav1.ObjectNameField,
Operator: v1.NodeSelectorOpIn,
Values: []string{"node_1"},
Values: []string{"node1"},
},
},
},
@ -523,7 +525,8 @@ func TestNodeAffinity(t *testing.T) {
},
},
},
nodeName: "node_1",
nodeName: "node1",
wantPreFilterResult: &framework.PreFilterResult{NodeNames: sets.NewString("node1")},
},
{
name: "Pod with matchFields using In operator that does not match the existing node",
@ -538,7 +541,7 @@ func TestNodeAffinity(t *testing.T) {
{
Key: metav1.ObjectNameField,
Operator: v1.NodeSelectorOpIn,
Values: []string{"node_1"},
Values: []string{"node1"},
},
},
},
@ -548,8 +551,9 @@ func TestNodeAffinity(t *testing.T) {
},
},
},
nodeName: "node_2",
wantStatus: framework.NewStatus(framework.UnschedulableAndUnresolvable, ErrReasonPod),
nodeName: "node2",
wantStatus: framework.NewStatus(framework.UnschedulableAndUnresolvable, ErrReasonPod),
wantPreFilterResult: &framework.PreFilterResult{NodeNames: sets.NewString("node1")},
},
{
name: "Pod with two terms: matchFields does not match, but matchExpressions matches",
@ -564,7 +568,7 @@ func TestNodeAffinity(t *testing.T) {
{
Key: metav1.ObjectNameField,
Operator: v1.NodeSelectorOpIn,
Values: []string{"node_1"},
Values: []string{"node1"},
},
},
},
@ -583,7 +587,7 @@ func TestNodeAffinity(t *testing.T) {
},
},
},
nodeName: "node_2",
nodeName: "node2",
labels: map[string]string{"foo": "bar"},
},
{
@ -599,7 +603,7 @@ func TestNodeAffinity(t *testing.T) {
{
Key: metav1.ObjectNameField,
Operator: v1.NodeSelectorOpIn,
Values: []string{"node_1"},
Values: []string{"node1"},
},
},
MatchExpressions: []v1.NodeSelectorRequirement{
@ -616,9 +620,10 @@ func TestNodeAffinity(t *testing.T) {
},
},
},
nodeName: "node_2",
labels: map[string]string{"foo": "bar"},
wantStatus: framework.NewStatus(framework.UnschedulableAndUnresolvable, ErrReasonPod),
nodeName: "node2",
labels: map[string]string{"foo": "bar"},
wantPreFilterResult: &framework.PreFilterResult{NodeNames: sets.NewString("node1")},
wantStatus: framework.NewStatus(framework.UnschedulableAndUnresolvable, ErrReasonPod),
},
{
name: "Pod with one term: both matchFields and matchExpressions match",
@ -633,7 +638,7 @@ func TestNodeAffinity(t *testing.T) {
{
Key: metav1.ObjectNameField,
Operator: v1.NodeSelectorOpIn,
Values: []string{"node_1"},
Values: []string{"node1"},
},
},
MatchExpressions: []v1.NodeSelectorRequirement{
@ -650,8 +655,9 @@ func TestNodeAffinity(t *testing.T) {
},
},
},
nodeName: "node_1",
labels: map[string]string{"foo": "bar"},
nodeName: "node1",
labels: map[string]string{"foo": "bar"},
wantPreFilterResult: &framework.PreFilterResult{NodeNames: sets.NewString("node1")},
},
{
name: "Pod with two terms: both matchFields and matchExpressions do not match",
@ -666,7 +672,7 @@ func TestNodeAffinity(t *testing.T) {
{
Key: metav1.ObjectNameField,
Operator: v1.NodeSelectorOpIn,
Values: []string{"node_1"},
Values: []string{"node1"},
},
},
},
@ -685,10 +691,78 @@ func TestNodeAffinity(t *testing.T) {
},
},
},
nodeName: "node_2",
nodeName: "node2",
labels: map[string]string{"foo": "bar"},
wantStatus: framework.NewStatus(framework.UnschedulableAndUnresolvable, ErrReasonPod),
},
{
name: "Pod with two terms of node.Name affinity",
pod: &v1.Pod{
Spec: v1.PodSpec{
Affinity: &v1.Affinity{
NodeAffinity: &v1.NodeAffinity{
RequiredDuringSchedulingIgnoredDuringExecution: &v1.NodeSelector{
NodeSelectorTerms: []v1.NodeSelectorTerm{
{
MatchFields: []v1.NodeSelectorRequirement{
{
Key: metav1.ObjectNameField,
Operator: v1.NodeSelectorOpIn,
Values: []string{"node1"},
},
},
},
{
MatchFields: []v1.NodeSelectorRequirement{
{
Key: metav1.ObjectNameField,
Operator: v1.NodeSelectorOpIn,
Values: []string{"node2"},
},
},
},
},
},
},
},
},
},
nodeName: "node2",
wantPreFilterResult: &framework.PreFilterResult{NodeNames: sets.NewString("node1", "node2")},
},
{
name: "Pod with two conflicting mach field requirements",
pod: &v1.Pod{
Spec: v1.PodSpec{
Affinity: &v1.Affinity{
NodeAffinity: &v1.NodeAffinity{
RequiredDuringSchedulingIgnoredDuringExecution: &v1.NodeSelector{
NodeSelectorTerms: []v1.NodeSelectorTerm{
{
MatchFields: []v1.NodeSelectorRequirement{
{
Key: metav1.ObjectNameField,
Operator: v1.NodeSelectorOpIn,
Values: []string{"node1"},
},
{
Key: metav1.ObjectNameField,
Operator: v1.NodeSelectorOpIn,
Values: []string{"node2"},
},
},
},
},
},
},
},
},
},
nodeName: "node2",
labels: map[string]string{"foo": "bar"},
wantPreFilterStatus: framework.NewStatus(framework.UnschedulableAndUnresolvable, errReasonConflict),
wantStatus: framework.NewStatus(framework.UnschedulableAndUnresolvable, ErrReasonPod),
},
{
name: "Matches added affinity and Pod's node affinity",
pod: &v1.Pod{
@ -712,7 +786,7 @@ func TestNodeAffinity(t *testing.T) {
},
},
},
nodeName: "node_2",
nodeName: "node2",
labels: map[string]string{"zone": "foo"},
args: config.NodeAffinityArgs{
AddedAffinity: &v1.NodeAffinity{
@ -721,7 +795,7 @@ func TestNodeAffinity(t *testing.T) {
MatchFields: []v1.NodeSelectorRequirement{{
Key: metav1.ObjectNameField,
Operator: v1.NodeSelectorOpIn,
Values: []string{"node_2"},
Values: []string{"node2"},
}},
}},
},
@ -751,7 +825,7 @@ func TestNodeAffinity(t *testing.T) {
},
},
},
nodeName: "node_2",
nodeName: "node2",
labels: map[string]string{"zone": "foo"},
args: config.NodeAffinityArgs{
AddedAffinity: &v1.NodeAffinity{
@ -760,7 +834,7 @@ func TestNodeAffinity(t *testing.T) {
MatchFields: []v1.NodeSelectorRequirement{{
Key: metav1.ObjectNameField,
Operator: v1.NodeSelectorOpIn,
Values: []string{"node_2"},
Values: []string{"node2"},
}},
}},
},
@ -771,7 +845,7 @@ func TestNodeAffinity(t *testing.T) {
{
name: "Doesn't match added affinity",
pod: &v1.Pod{},
nodeName: "node_2",
nodeName: "node2",
labels: map[string]string{"zone": "foo"},
args: config.NodeAffinityArgs{
AddedAffinity: &v1.NodeAffinity{
@ -855,14 +929,17 @@ func TestNodeAffinity(t *testing.T) {
state := framework.NewCycleState()
var gotStatus *framework.Status
if !test.disablePreFilter {
_, gotStatus = p.(framework.PreFilterPlugin).PreFilter(context.Background(), state, test.pod)
if !gotStatus.IsSuccess() {
t.Errorf("unexpected error: %v", gotStatus)
gotPreFilterResult, gotStatus := p.(framework.PreFilterPlugin).PreFilter(context.Background(), state, test.pod)
if diff := cmp.Diff(test.wantPreFilterStatus, gotStatus); diff != "" {
t.Errorf("unexpected PreFilter Status (-want,+got):\n%s", diff)
}
if diff := cmp.Diff(test.wantPreFilterResult, gotPreFilterResult); diff != "" {
t.Errorf("unexpected PreFilterResult (-want,+got):\n%s", diff)
}
}
gotStatus = p.(framework.FilterPlugin).Filter(context.Background(), state, test.pod, nodeInfo)
if !reflect.DeepEqual(gotStatus, test.wantStatus) {
t.Errorf("status does not match: %v, want: %v", gotStatus, test.wantStatus)
if diff := cmp.Diff(test.wantStatus, gotStatus); diff != "" {
t.Errorf("unexpected Filter Status (-want,+got):\n%s", diff)
}
})
}