Move TaintBasedEvictions feature gates to GA

Author: skilxn-go

cmd/kube-controller-manager/app/core.go

@@ -207,7 +207,6 @@ func startNodeLifecycleController(ctx ControllerContext) (http.Handler, bool, er
 		ctx.ComponentConfig.NodeLifecycleController.LargeClusterSizeThreshold,
 		ctx.ComponentConfig.NodeLifecycleController.UnhealthyZoneThreshold,
 		ctx.ComponentConfig.NodeLifecycleController.EnableTaintManager,
-		utilfeature.DefaultFeatureGate.Enabled(features.TaintBasedEvictions),
 	)
 	if err != nil {
 		return nil, true, err

pkg/controller/nodelifecycle/node_lifecycle_controller.go

@@ -351,10 +351,6 @@ type Controller struct {
 	// tainted nodes, if they're not tolerated.
 	runTaintManager bool
 
-	// if set to true Controller will taint Nodes with 'TaintNodeNotReady' and 'TaintNodeUnreachable'
-	// taints instead of evicting Pods itself.
-	useTaintBasedEvictions bool
-
 	nodeUpdateQueue workqueue.Interface
 	podUpdateQueue  workqueue.RateLimitingInterface
 }
@@ -375,7 +371,6 @@ func NewNodeLifecycleController(
 	largeClusterThreshold int32,
 	unhealthyZoneThreshold float32,
 	runTaintManager bool,
-	useTaintBasedEvictions bool,
 ) (*Controller, error) {
 
 	if kubeClient == nil {
@@ -416,13 +411,9 @@ func NewNodeLifecycleController(
 		largeClusterThreshold:       largeClusterThreshold,
 		unhealthyZoneThreshold:      unhealthyZoneThreshold,
 		runTaintManager:             runTaintManager,
-		useTaintBasedEvictions:      useTaintBasedEvictions && runTaintManager,
 		nodeUpdateQueue:             workqueue.NewNamed("node_lifecycle_controller"),
 		podUpdateQueue:              workqueue.NewNamedRateLimitingQueue(workqueue.DefaultControllerRateLimiter(), "node_lifecycle_controller_pods"),
 	}
-	if useTaintBasedEvictions {
-		klog.Infof("Controller is using taint based evictions.")
-	}
 
 	nc.enterPartialDisruptionFunc = nc.ReducedQPSFunc
 	nc.enterFullDisruptionFunc = nc.HealthyQPSFunc
@@ -580,7 +571,7 @@ func (nc *Controller) Run(stopCh <-chan struct{}) {
 		go wait.Until(nc.doPodProcessingWorker, time.Second, stopCh)
 	}
 
-	if nc.useTaintBasedEvictions {
+	if nc.runTaintManager {
 		// Handling taint based evictions. Because we don't want a dedicated logic in TaintManager for NC-originated
 		// taints and we normally don't rate limit evictions caused by taints, we need to rate limit adding taints.
 		go wait.Until(nc.doNoExecuteTaintingPass, scheduler.NodeEvictionPeriod, stopCh)
@@ -768,9 +759,7 @@ func (nc *Controller) doEvictionPass() {
 
 // monitorNodeHealth verifies node health are constantly updated by kubelet, and
 // if not, post "NodeReady==ConditionUnknown".
-// For nodes who are not ready or not reachable for a long period of time.
-// This function will taint them if TaintBasedEvictions feature was enabled.
-// Otherwise, it would evict it directly.
+// This function will taint nodes who are not ready or not reachable for a long period of time.
 func (nc *Controller) monitorNodeHealth() error {
 	// We are listing nodes from local cache as we can tolerate some small delays
 	// comparing to state from etcd and there is eventual consistency anyway.
@@ -789,7 +778,7 @@ func (nc *Controller) monitorNodeHealth() error {
 		nodeutil.RecordNodeEvent(nc.recorder, added[i].Name, string(added[i].UID), v1.EventTypeNormal, "RegisteredNode", fmt.Sprintf("Registered Node %v in Controller", added[i].Name))
 		nc.knownNodeSet[added[i].Name] = added[i]
 		nc.addPodEvictorForNewZone(added[i])
-		if nc.useTaintBasedEvictions {
+		if nc.runTaintManager {
 			nc.markNodeAsReachable(added[i])
 		} else {
 			nc.cancelPodEviction(added[i])
@@ -843,7 +832,7 @@ func (nc *Controller) monitorNodeHealth() error {
 				}
 				continue
 			}
-			if nc.useTaintBasedEvictions {
+			if nc.runTaintManager {
 				nc.processTaintBaseEviction(node, &observedReadyCondition)
 			} else {
 				if err := nc.processNoTaintBaseEviction(node, &observedReadyCondition, gracePeriod, pods); err != nil {
@@ -1209,7 +1198,7 @@ func (nc *Controller) handleDisruption(zoneToNodeConditions map[string][]*v1.Nod
 		if allAreFullyDisrupted {
 			klog.V(0).Info("Controller detected that all Nodes are not-Ready. Entering master disruption mode.")
 			for i := range nodes {
-				if nc.useTaintBasedEvictions {
+				if nc.runTaintManager {
 					_, err := nc.markNodeAsReachable(nodes[i])
 					if err != nil {
 						klog.Errorf("Failed to remove taints from Node %v", nodes[i].Name)
@@ -1220,7 +1209,7 @@ func (nc *Controller) handleDisruption(zoneToNodeConditions map[string][]*v1.Nod
 			}
 			// We stop all evictions.
 			for k := range nc.zoneStates {
-				if nc.useTaintBasedEvictions {
+				if nc.runTaintManager {
 					nc.zoneNoExecuteTainter[k].SwapLimiter(0)
 				} else {
 					nc.zonePodEvictor[k].SwapLimiter(0)
@@ -1332,7 +1321,7 @@ func (nc *Controller) processPod(podItem podUpdateItem) {
 	pods := []*v1.Pod{pod}
 	// In taint-based eviction mode, only node updates are processed by NodeLifecycleController.
 	// Pods are processed by TaintManager.
-	if !nc.useTaintBasedEvictions {
+	if !nc.runTaintManager {
 		if err := nc.processNoTaintBaseEviction(node, currentReadyCondition, nc.nodeMonitorGracePeriod, pods); err != nil {
 			klog.Warningf("Unable to process pod %+v eviction from node %v: %v.", podItem, nodeName, err)
 			nc.podUpdateQueue.AddRateLimited(podItem)
@@ -1351,21 +1340,21 @@ func (nc *Controller) processPod(podItem podUpdateItem) {
 func (nc *Controller) setLimiterInZone(zone string, zoneSize int, state ZoneState) {
 	switch state {
 	case stateNormal:
-		if nc.useTaintBasedEvictions {
+		if nc.runTaintManager {
 			nc.zoneNoExecuteTainter[zone].SwapLimiter(nc.evictionLimiterQPS)
 		} else {
 			nc.zonePodEvictor[zone].SwapLimiter(nc.evictionLimiterQPS)
 		}
 	case statePartialDisruption:
-		if nc.useTaintBasedEvictions {
+		if nc.runTaintManager {
 			nc.zoneNoExecuteTainter[zone].SwapLimiter(
 				nc.enterPartialDisruptionFunc(zoneSize))
 		} else {
 			nc.zonePodEvictor[zone].SwapLimiter(
 				nc.enterPartialDisruptionFunc(zoneSize))
 		}
 	case stateFullDisruption:
-		if nc.useTaintBasedEvictions {
+		if nc.runTaintManager {
 			nc.zoneNoExecuteTainter[zone].SwapLimiter(
 				nc.enterFullDisruptionFunc(zoneSize))
 		} else {
@@ -1431,7 +1420,7 @@ func (nc *Controller) addPodEvictorForNewZone(node *v1.Node) {
 	zone := utilnode.GetZoneKey(node)
 	if _, found := nc.zoneStates[zone]; !found {
 		nc.zoneStates[zone] = stateInitial
-		if !nc.useTaintBasedEvictions {
+		if !nc.runTaintManager {
 			nc.zonePodEvictor[zone] =
 				scheduler.NewRateLimitedTimedQueue(
 					flowcontrol.NewTokenBucketRateLimiter(nc.evictionLimiterQPS, scheduler.EvictionRateLimiterBurst))

pkg/controller/nodelifecycle/node_lifecycle_controller_test.go

@@ -180,7 +180,6 @@ func newNodeLifecycleControllerFromClient(
 		largeClusterThreshold,
 		unhealthyZoneThreshold,
 		useTaints,
-		useTaints,
 	)
 	if err != nil {
 		return nil, err

pkg/features/kube_features.go

@@ -61,6 +61,7 @@ const (
 
 	// owner: @Huang-Wei
 	// beta: v1.13
+	// ga: v1.18
 	//
 	// Changes the logic behind evicting Pods from not ready Nodes
 	// to take advantage of NoExecute Taints and Tolerations.
@@ -592,7 +593,7 @@ var defaultKubernetesFeatureGates = map[featuregate.Feature]featuregate.FeatureS
 	DynamicKubeletConfig: {Default: true, PreRelease: featuregate.Beta},
 	ExperimentalHostUserNamespaceDefaultingGate: {Default: false, PreRelease: featuregate.Beta},
 	DevicePlugins:                  {Default: true, PreRelease: featuregate.Beta},
-	TaintBasedEvictions:            {Default: true, PreRelease: featuregate.Beta},
+	TaintBasedEvictions:            {Default: true, PreRelease: featuregate.GA, LockToDefault: true}, // remove in 1.19
 	RotateKubeletServerCertificate: {Default: true, PreRelease: featuregate.Beta},
 	RotateKubeletClientCertificate: {Default: true, PreRelease: featuregate.Beta},
 	LocalStorageCapacityIsolation:  {Default: true, PreRelease: featuregate.Beta},

staging/src/k8s.io/api/core/v1/well_known_taints.go

@@ -18,38 +18,31 @@ package v1
 
 const (
 	// TaintNodeNotReady will be added when node is not ready
-	// and feature-gate for TaintBasedEvictions flag is enabled,
 	// and removed when node becomes ready.
 	TaintNodeNotReady = "node.kubernetes.io/not-ready"
 
 	// TaintNodeUnreachable will be added when node becomes unreachable
 	// (corresponding to NodeReady status ConditionUnknown)
-	// and feature-gate for TaintBasedEvictions flag is enabled,
 	// and removed when node becomes reachable (NodeReady status ConditionTrue).
 	TaintNodeUnreachable = "node.kubernetes.io/unreachable"
 
 	// TaintNodeUnschedulable will be added when node becomes unschedulable
-	// and feature-gate for TaintNodesByCondition flag is enabled,
 	// and removed when node becomes scheduable.
 	TaintNodeUnschedulable = "node.kubernetes.io/unschedulable"
 
 	// TaintNodeMemoryPressure will be added when node has memory pressure
-	// and feature-gate for TaintNodesByCondition flag is enabled,
 	// and removed when node has enough memory.
 	TaintNodeMemoryPressure = "node.kubernetes.io/memory-pressure"
 
 	// TaintNodeDiskPressure will be added when node has disk pressure
-	// and feature-gate for TaintNodesByCondition flag is enabled,
 	// and removed when node has enough disk.
 	TaintNodeDiskPressure = "node.kubernetes.io/disk-pressure"
 
 	// TaintNodeNetworkUnavailable will be added when node's network is unavailable
-	// and feature-gate for TaintNodesByCondition flag is enabled,
 	// and removed when network becomes ready.
 	TaintNodeNetworkUnavailable = "node.kubernetes.io/network-unavailable"
 
 	// TaintNodePIDPressure will be added when node has pid pressure
-	// and feature-gate for TaintNodesByCondition flag is enabled,
 	// and removed when node has enough disk.
 	TaintNodePIDPressure = "node.kubernetes.io/pid-pressure"
 )

test/integration/node/BUILD

@@ -15,7 +15,6 @@ go_test(
     tags = ["integration"],
     deps = [
         "//pkg/controller/nodelifecycle:go_default_library",
-        "//pkg/features:go_default_library",
         "//plugin/pkg/admission/defaulttolerationseconds:go_default_library",
         "//plugin/pkg/admission/podtolerationrestriction:go_default_library",
         "//plugin/pkg/admission/podtolerationrestriction/apis/podtolerationrestriction:go_default_library",
@@ -25,11 +24,9 @@ go_test(
         "//staging/src/k8s.io/apimachinery/pkg/apis/meta/v1:go_default_library",
         "//staging/src/k8s.io/apimachinery/pkg/runtime/schema:go_default_library",
         "//staging/src/k8s.io/apiserver/pkg/admission:go_default_library",
-        "//staging/src/k8s.io/apiserver/pkg/util/feature:go_default_library",
         "//staging/src/k8s.io/client-go/informers:go_default_library",
         "//staging/src/k8s.io/client-go/kubernetes:go_default_library",
         "//staging/src/k8s.io/client-go/rest:go_default_library",
-        "//staging/src/k8s.io/component-base/featuregate/testing:go_default_library",
         "//test/e2e/framework/pod:go_default_library",
         "//test/integration/framework:go_default_library",
         "//test/integration/util:go_default_library",

test/integration/node/lifecycle_test.go

@@ -28,13 +28,10 @@ import (
 	metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
 	"k8s.io/apimachinery/pkg/runtime/schema"
 	"k8s.io/apiserver/pkg/admission"
-	utilfeature "k8s.io/apiserver/pkg/util/feature"
 	"k8s.io/client-go/informers"
 	"k8s.io/client-go/kubernetes"
 	restclient "k8s.io/client-go/rest"
-	featuregatetesting "k8s.io/component-base/featuregate/testing"
 	"k8s.io/kubernetes/pkg/controller/nodelifecycle"
-	"k8s.io/kubernetes/pkg/features"
 	"k8s.io/kubernetes/plugin/pkg/admission/defaulttolerationseconds"
 	"k8s.io/kubernetes/plugin/pkg/admission/podtolerationrestriction"
 	pluginapi "k8s.io/kubernetes/plugin/pkg/admission/podtolerationrestriction/apis/podtolerationrestriction"
@@ -109,9 +106,6 @@ func TestTaintBasedEvictions(t *testing.T) {
 		},
 	}
 
-	// Enable TaintBasedEvictions
-	defer featuregatetesting.SetFeatureGateDuringTest(t, utilfeature.DefaultFeatureGate, features.TaintBasedEvictions, true)()
-
 	// Build admission chain handler.
 	podTolerations := podtolerationrestriction.NewPodTolerationsPlugin(&pluginapi.Configuration{})
 	admission := admission.NewChainHandler(
@@ -156,7 +150,6 @@ func TestTaintBasedEvictions(t *testing.T) {
 				50,               // Large cluster threshold
 				0.55,             // Unhealthy zone threshold
 				true,             // Run taint manager
-				true,             // Use taint based evictions
 			)
 			if err != nil {
 				t.Errorf("Failed to create node controller: %v", err)

test/integration/scheduler/taint_test.go

@@ -98,7 +98,6 @@ func TestTaintNodeByCondition(t *testing.T) {
 		100,         // Large cluster threshold
 		100,         // Unhealthy zone threshold
 		true,        // Run taint manager
-		true,        // Use taint based evictions
 	)
 	if err != nil {
 		t.Errorf("Failed to create node controller: %v", err)