support matchLabelKeys for topology spread

kubernetes-sigs · Aug 15, 2024 · 1d46f34 · 1d46f34
1 parent bc2d87a
commit 1d46f34
Show file tree

Hide file tree

Showing 2 changed files with 68 additions and 13 deletions.
diff --git a/pkg/controllers/provisioning/scheduling/topology.go b/pkg/controllers/provisioning/scheduling/topology.go
@@ -333,6 +333,11 @@ func (t *Topology) countDomains(ctx context.Context, tg *TopologyGroup) error {
 func (t *Topology) newForTopologies(p *corev1.Pod) []*TopologyGroup {
 	var topologyGroups []*TopologyGroup
 	for _, cs := range p.Spec.TopologySpreadConstraints {
+		for _, label := range cs.MatchLabelKeys {
+			if value, ok := p.ObjectMeta.Labels[label]; ok {
+				cs.LabelSelector.MatchLabels[label] = value
+			}
+		}
 		topologyGroups = append(topologyGroups, NewTopologyGroup(TopologyTypeSpread, cs.TopologyKey, p, sets.New(p.Namespace),
 			cs.LabelSelector, cs.MaxSkew, cs.MinDomains, cs.NodeTaintsPolicy, cs.NodeAffinityPolicy, t.domainGroups[cs.TopologyKey]))
 	}

diff --git a/pkg/controllers/provisioning/scheduling/topology_test.go b/pkg/controllers/provisioning/scheduling/topology_test.go
@@ -1127,11 +1127,69 @@ var _ = Describe("Topology", func() {
 		})
 	})
 
+	Context("MatchLabelKeys", func() {
+		BeforeEach(func() {
+			if env.Version.Minor() < 27 {
+				Skip("MatchLabelKeys only enabled by default forK8S >= 1.27.x")
+			}
+		})
+
+		It("should support matchLabelKeys", func() {
+			matchedLabel := "test-label"
+			topology := []corev1.TopologySpreadConstraint{{
+				TopologyKey:       corev1.LabelHostname,
+				WhenUnsatisfiable: corev1.DoNotSchedule,
+				LabelSelector:     &metav1.LabelSelector{MatchLabels: labels},
+				MatchLabelKeys:    []string{matchedLabel},
+				MaxSkew:           1,
+			}}
+			count := 2
+			pods := test.UnschedulablePods(test.PodOptions{
+				ObjectMeta: metav1.ObjectMeta{
+					Labels: lo.Assign(labels, map[string]string{matchedLabel: "value-a"}),
+				},
+				TopologySpreadConstraints: topology,
+			}, count)
+			pods = append(pods, test.UnschedulablePods(test.PodOptions{
+				ObjectMeta: metav1.ObjectMeta{
+					Labels: lo.Assign(labels, map[string]string{matchedLabel: "value-b"}),
+				},
+				TopologySpreadConstraints: topology,
+			}, count)...)
+			ExpectApplied(ctx, env.Client, nodePool)
+			ExpectProvisioned(ctx, env.Client, cluster, cloudProvider, prov, pods...)
+			ExpectSkew(ctx, env.Client, "default", &topology[0]).To(ConsistOf(2, 2))
+		})
+
+		It("should ignore unknown labels specified in matchLabelKeys", func() {
+			matchedLabel := "test-label"
+			topology := []corev1.TopologySpreadConstraint{{
+				TopologyKey:       corev1.LabelHostname,
+				WhenUnsatisfiable: corev1.DoNotSchedule,
+				LabelSelector:     &metav1.LabelSelector{MatchLabels: labels},
+				MatchLabelKeys:    []string{matchedLabel},
+				MaxSkew:           1,
+			}}
+			pods := test.UnschedulablePods(test.PodOptions{
+				ObjectMeta: metav1.ObjectMeta{
+					Labels: labels,
+				},
+				TopologySpreadConstraints: topology,
+			}, 4)
+			ExpectApplied(ctx, env.Client, nodePool)
+			ExpectProvisioned(ctx, env.Client, cluster, cloudProvider, prov, pods...)
+			ExpectSkew(ctx, env.Client, "default", &topology[0]).To(ConsistOf(1, 1, 1, 1))
+		})
+	})
+
 	Context("NodeTaintsPolicy", func() {
-		It("should balance pods across a label (NodeTaintsPolicy=ignore)", func() {
+		BeforeEach(func() {
 			if env.Version.Minor() < 26 {
-				Skip("NodeTaintsPolicy ony enabled by default for K8s >= 1.26.x")
+				Skip("NodeTaintsPolicy only enabled by default for K8s >= 1.26.x")
 			}
+		})
+
+		It("should balance pods across a label (NodeTaintsPolicy=ignore)", func() {
 
 			const spreadLabel = "fake-label"
 			nodePool.Spec.Template.Labels = map[string]string{
@@ -1204,9 +1262,6 @@ var _ = Describe("Topology", func() {
 			ExpectSkew(ctx, env.Client, "default", &topology[0]).To(ConsistOf(1))
 		})
 		It("should balance pods across a label (NodeTaintsPolicy=honor)", func() {
-			if env.Version.Minor() < 26 {
-				Skip("NodeTaintsPolicy ony enabled by default for K8s >= 1.26.x")
-			}
 			const spreadLabel = "fake-label"
 			nodePool.Spec.Template.Labels = map[string]string{
 				spreadLabel: "baz",
@@ -1340,10 +1395,6 @@ var _ = Describe("Topology", func() {
 			ExpectSkew(ctx, env.Client, "default", &topology[0]).To(ConsistOf(1))
 		})
 		It("should balance pods across a label when discovered from the provisioner (NodeTaintsPolicy=honor)", func() {
-			if env.Version.Minor() < 26 {
-				Skip("NodeTaintsPolicy ony enabled by default for K8s >= 1.26.x")
-			}
-
 			const spreadLabel = "fake-label"
 			const taintKey = "taint-key"
 			nodePool.Spec.Template.Spec.Requirements = append(nodePool.Spec.Template.Spec.Requirements, v1.NodeSelectorRequirementWithMinValues{
@@ -1475,10 +1526,12 @@ var _ = Describe("Topology", func() {
 	})
 
 	Context("NodeAffinityPolicy", func() {
-		It("should balance pods across a label (NodeAffinityPolicy=ignore)", func() {
+		BeforeEach(func() {
 			if env.Version.Minor() < 26 {
 				Skip("NodeAffinityPolicy ony enabled by default for K8s >= 1.26.x")
 			}
+		})
+		It("should balance pods across a label (NodeAffinityPolicy=ignore)", func() {
 			const spreadLabel = "fake-label"
 			const affinityLabel = "selector"
 			const affinityMismatch = "mismatch"
@@ -1547,9 +1600,6 @@ var _ = Describe("Topology", func() {
 			ExpectSkew(ctx, env.Client, "default", &topology[0]).To(ConsistOf(1))
 		})
 		It("should balance pods across a label (NodeAffinityPolicy=honor)", func() {
-			if env.Version.Minor() < 26 {
-				Skip("NodeAffinityPolicy ony enabled by default for K8s >= 1.26.x")
-			}
 			const spreadLabel = "fake-label"
 			const affinityLabel = "selector"
 			const affinityMismatch = "mismatch"