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fix: node added with matched pod anti-affinity topologyKey

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Co-authored-by: Kensei Nakada <handbomusic@gmail.com>
This commit is contained in:
nayihz
2024-02-05 16:37:04 +08:00
parent 0cfe4438e9
commit 1b3d10aafa
4 changed files with 36 additions and 12 deletions
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27
pkg/scheduler/framework/plugins/interpodaffinity/plugin.go
View File

@@ -166,6 +166,8 @@ func (pl *InterPodAffinity) isSchedulableAfterPodChange(logger klog.Logger, pod
}
// Pod is updated. Return Queue when the updated pod matching the target pod's affinity or not matching anti-affinity.
// Note that, we don't need to check each affinity individually when the Pod has more than one affinity
// because the current PodAffinity looks for a **single** existing pod that can satisfy **all** the terms of inter-pod affinity of an incoming pod.
if modifiedPod != nil && originalPod != nil {
if !podMatchesAllAffinityTerms(terms, originalPod) && podMatchesAllAffinityTerms(terms, modifiedPod) {
logger.V(5).Info("a scheduled pod was updated to match the target pod's affinity, and the pod may be schedulable now",
@@ -195,12 +197,12 @@ func (pl *InterPodAffinity) isSchedulableAfterPodChange(logger klog.Logger, pod
}
// Pod is deleted. Return Queue when the deleted pod matching the target pod's anti-affinity.
if podMatchesAllAffinityTerms(antiTerms, originalPod) {
logger.V(5).Info("a scheduled pod was deteled but it matches the target pod's anti-affinity",
if !podMatchesAllAffinityTerms(antiTerms, originalPod) {
logger.V(5).Info("a scheduled pod was deleted but it doesn't match the target pod's anti-affinity",
"pod", klog.KObj(pod), "modifiedPod", klog.KObj(modifiedPod))
return framework.QueueSkip, nil
}
logger.V(5).Info("a scheduled pod was deleted but it doesn't match the target pod's anti-affinity, and the pod may be schedulable now",
logger.V(5).Info("a scheduled pod was deleted and it matches the target pod's anti-affinity. The pod may be schedulable now",
"pod", klog.KObj(pod), "modifiedPod", klog.KObj(modifiedPod))
return framework.Queue, nil
}
@@ -218,10 +220,25 @@ func (pl *InterPodAffinity) isSchedulableAfterNodeChange(logger klog.Logger, pod
for _, term := range terms {
if _, ok := modifiedNode.Labels[term.TopologyKey]; ok {
logger.V(5).Info("a node with topologyKey was added/updated and it may make pod schedulable", "pod", klog.KObj(pod), "node", klog.KObj(modifiedNode))
logger.V(5).Info("a node with matched pod affinity topologyKey was added/updated and it may make pod schedulable",
"pod", klog.KObj(pod), "node", klog.KObj(modifiedNode))
return framework.Queue, err
}
}
logger.V(5).Info("a node is added/updated but doesn't have any topologyKey of pod affinity", "pod", klog.KObj(pod), "node", klog.KObj(modifiedNode))
antiTerms, err := framework.GetAffinityTerms(pod, framework.GetPodAntiAffinityTerms(pod.Spec.Affinity))
if err != nil {
return framework.Queue, err
}
for _, term := range antiTerms {
if _, ok := modifiedNode.Labels[term.TopologyKey]; ok {
logger.V(5).Info("a node with matched pod anti-affinity topologyKey was added/updated and it may make pod schedulable",
"pod", klog.KObj(pod), "node", klog.KObj(modifiedNode))
return framework.Queue, err
}
}
logger.V(5).Info("a node is added/updated but doesn't have any topologyKey which matches pod affinity/anti-affinity",
"pod", klog.KObj(pod), "node", klog.KObj(modifiedNode))
return framework.QueueSkip, nil
}

13
pkg/scheduler/framework/plugins/interpodaffinity/plugin_test.go
View File

@@ -22,6 +22,7 @@ import (
"github.com/google/go-cmp/cmp"
v1 "k8s.io/api/core/v1"
metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
"k8s.io/klog/v2/ktesting"
"k8s.io/kubernetes/pkg/scheduler/apis/config"
"k8s.io/kubernetes/pkg/scheduler/framework"
@@ -116,13 +117,13 @@ func Test_isSchedulableAfterPodChange(t *testing.T) {
{
name: "delete a pod which doesn't match pod's anti-affinity",
pod: st.MakePod().Name("p").PodAntiAffinityIn("service", "region", []string{"securityscan", "value2"}, st.PodAntiAffinityWithRequiredReq).Obj(),
oldPod: st.MakePod().Node("fake-node").Label("service", "securityscan").Obj(),
oldPod: st.MakePod().Node("fake-node").Label("aaa", "a").Obj(),
expectedHint: framework.QueueSkip,
},
{
name: "delete a pod which matches pod's anti-affinity",
pod: st.MakePod().Name("p").PodAntiAffinityIn("service", "region", []string{"securityscan", "value2"}, st.PodAntiAffinityWithRequiredReq).Obj(),
oldPod: st.MakePod().Node("fake-node").Label("aaa", "a").Obj(),
oldPod: st.MakePod().Node("fake-node").Label("service", "securityscan").Obj(),
expectedHint: framework.Queue,
},
}
@@ -154,11 +155,17 @@ func Test_isSchedulableAfterNodeChange(t *testing.T) {
expectedHint framework.QueueingHint
}{
{
name: "add a new node with matched topologyKey",
name: "add a new node with matched pod affinity topologyKey",
pod: st.MakePod().Name("p").PodAffinityIn("service", "zone", []string{"securityscan", "value2"}, st.PodAffinityWithRequiredReq).Obj(),
newNode: st.MakeNode().Name("node-a").Label("zone", "zone1").Obj(),
expectedHint: framework.Queue,
},
{
name: "add a new node with matched pod anti-affinity topologyKey",
pod: st.MakePod().Name("p").PodAntiAffinity("zone", &metav1.LabelSelector{MatchLabels: map[string]string{"another": "label"}}, st.PodAntiAffinityWithRequiredReq).Obj(),
newNode: st.MakeNode().Name("node-a").Label("zone", "zone1").Obj(),
expectedHint: framework.Queue,
},
{
name: "add a new node without matched topologyKey",
pod: st.MakePod().Name("p").PodAffinityIn("service", "region", []string{"securityscan", "value2"}, st.PodAffinityWithRequiredReq).Obj(),

2
pkg/scheduler/framework/types.go
View File

@@ -433,7 +433,7 @@ func newAffinityTerm(pod *v1.Pod, term *v1.PodAffinityTerm) (*AffinityTerm, erro
return &AffinityTerm{Namespaces: namespaces, Selector: selector, TopologyKey: term.TopologyKey, NamespaceSelector: nsSelector}, nil
}
// getAffinityTerms receives a Pod and affinity terms and returns the namespaces and
// GetAffinityTerms receives a Pod and affinity terms and returns the namespaces and
// selectors of the terms.
func GetAffinityTerms(pod *v1.Pod, v1Terms []v1.PodAffinityTerm) ([]AffinityTerm, error) {
if v1Terms == nil {

6
test/integration/scheduler/queue_test.go
View File

@@ -204,9 +204,9 @@ func TestCoreResourceEnqueue(t *testing.T) {
// However, due to preCheck, it's not requeueing pod2 to activeQ.
// It'll be fixed by the removal of preCheck in the future.
// https://github.com/kubernetes/kubernetes/issues/110175
node := st.MakeNode().Name("fake-node2").Capacity(map[v1.ResourceName]string{v1.ResourceCPU: "2"}).Taints([]v1.Taint{{Key: v1.TaintNodeNotReady, Effect: v1.TaintEffectNoSchedule}}).Obj()
if _, err := testCtx.ClientSet.CoreV1().Nodes().Create(testCtx.Ctx, st.MakeNode().Name("fake-node2").Capacity(map[v1.ResourceName]string{v1.ResourceCPU: "2"}).Taints([]v1.Taint{{Key: "foo", Effect: v1.TaintEffectNoSchedule}}).Obj(), metav1.CreateOptions{}); err != nil {
return fmt.Errorf("failed to create a newnode: %w", err)
node := st.MakeNode().Name("fake-node2").Label("node", "fake-node2").Capacity(map[v1.ResourceName]string{v1.ResourceCPU: "2"}).Taints([]v1.Taint{{Key: v1.TaintNodeNotReady, Effect: v1.TaintEffectNoSchedule}}).Obj()
if _, err := testCtx.ClientSet.CoreV1().Nodes().Create(testCtx.Ctx, node, metav1.CreateOptions{}); err != nil {
return fmt.Errorf("failed to create a new node: %w", err)
}
// As a mitigation of an issue described above, all plugins subscribing Node/Add event register UpdateNodeTaint too.