scheduler: remove the restriction that reservation cannot be preempted (

koordinator-sh#1859)

Signed-off-by: Joseph <joseph.t.lee@outlook.com>

pkg/scheduler/frameworkext/eventhandlers/reservation_handler.go

@@ -18,7 +18,6 @@ package eventhandlers
 
 import (
 	"context"
-	"math"
 
 	corev1 "k8s.io/api/core/v1"
 	"k8s.io/apimachinery/pkg/api/errors"
@@ -30,7 +29,6 @@ import (
 	"k8s.io/kubernetes/pkg/scheduler"
 	"k8s.io/kubernetes/pkg/scheduler/framework"
 	"k8s.io/kubernetes/pkg/scheduler/profile"
-	"k8s.io/utils/pointer"
 
 	schedulingv1alpha1 "github.com/koordinator-sh/koordinator/apis/scheduling/v1alpha1"
 	koordclientset "github.com/koordinator-sh/koordinator/pkg/client/clientset/versioned"
@@ -274,8 +272,6 @@ func addReservationToSchedulerCache(sched frameworkext.Scheduler, obj interface{
 
 	// update pod cache and trigger pod assigned event for scheduling queue
 	reservePod := reservationutil.NewReservePod(r)
-	// Forces priority to be set to maximum to prevent preemption.
-	reservePod.Spec.Priority = pointer.Int32(math.MaxInt32)
 	if err = sched.GetCache().AddPod(reservePod); err != nil {
 		klog.ErrorS(err, "Failed to add reservation into SchedulerCache", "reservation", klog.KObj(reservePod))
 	} else {
@@ -338,9 +334,6 @@ func updateReservationInSchedulerCache(sched frameworkext.Scheduler, oldObj, new
 	}
 	oldReservePod := reservationutil.NewReservePod(oldR)
 	newReservePod := reservationutil.NewReservePod(newR)
-	// Forces priority to be set to maximum to prevent preemption.
-	oldReservePod.Spec.Priority = pointer.Int32(math.MaxInt32)
-	newReservePod.Spec.Priority = pointer.Int32(math.MaxInt32)
 	if err := sched.GetCache().UpdatePod(oldReservePod, newReservePod); err != nil {
 		klog.ErrorS(err, "Failed to update reservation into SchedulerCache", "reservation", klog.KObj(newR))
 	} else {
@@ -380,8 +373,6 @@ func deleteReservationFromSchedulerCache(sched frameworkext.Scheduler, obj inter
 	}
 
 	reservePod := reservationutil.NewReservePod(r)
-	// Forces priority to be set to maximum to prevent preemption.
-	reservePod.Spec.Priority = pointer.Int32(math.MaxInt32)
 	if _, err = sched.GetCache().GetPod(reservePod); err == nil {
 		if len(rInfo.AllocatedPorts) > 0 {
 			allocatablePorts := util.RequestedHostPorts(reservePod)

pkg/scheduler/plugins/deviceshare/plugin.go

@@ -161,10 +161,6 @@ func (p *Plugin) PreFilterExtensions() framework.PreFilterExtensions {
 }
 
 func (p *Plugin) AddPod(ctx context.Context, cycleState *framework.CycleState, podToSchedule *corev1.Pod, podInfoToAdd *framework.PodInfo, nodeInfo *framework.NodeInfo) *framework.Status {
-	if reservationutil.IsReservePod(podInfoToAdd.Pod) {
-		return nil
-	}
-
 	state, status := getPreFilterState(cycleState)
 	if !status.IsSuccess() {
 		return status
@@ -220,10 +216,6 @@ func (p *Plugin) AddPod(ctx context.Context, cycleState *framework.CycleState, p
 }
 
 func (p *Plugin) RemovePod(ctx context.Context, cycleState *framework.CycleState, podToSchedule *corev1.Pod, podInfoToRemove *framework.PodInfo, nodeInfo *framework.NodeInfo) *framework.Status {
-	if reservationutil.IsReservePod(podInfoToRemove.Pod) {
-		return nil
-	}
-
 	state, status := getPreFilterState(cycleState)
 	if !status.IsSuccess() {
 		return status

pkg/scheduler/plugins/elasticquota/plugin.go

@@ -45,7 +45,6 @@ import (
 	"github.com/koordinator-sh/koordinator/pkg/scheduler/frameworkext"
 	frameworkexthelper "github.com/koordinator-sh/koordinator/pkg/scheduler/frameworkext/helper"
 	"github.com/koordinator-sh/koordinator/pkg/scheduler/plugins/elasticquota/core"
-	reservationutil "github.com/koordinator-sh/koordinator/pkg/util/reservation"
 	"github.com/koordinator-sh/koordinator/pkg/util/transformer"
 )
 
@@ -262,10 +261,6 @@ func (g *Plugin) PreFilterExtensions() framework.PreFilterExtensions {
 // AddPod is called by the framework while trying to evaluate the impact
 // of adding podToAdd to the node while scheduling podToSchedule.
 func (g *Plugin) AddPod(ctx context.Context, state *framework.CycleState, podToSchedule *corev1.Pod, podInfoToAdd *framework.PodInfo, nodeInfo *framework.NodeInfo) *framework.Status {
-	if reservationutil.IsReservePod(podInfoToAdd.Pod) {
-		return nil
-	}
-
 	postFilterState, err := getPostFilterState(state)
 	if err != nil {
 		klog.ErrorS(err, "Failed to read postFilterState from cycleState", "elasticQuotaSnapshotKey", postFilterState)
@@ -286,10 +281,6 @@ func (g *Plugin) AddPod(ctx context.Context, state *framework.CycleState, podToS
 // RemovePod is called by the framework while trying to evaluate the impact
 // of removing podToRemove from the node while scheduling podToSchedule.
 func (g *Plugin) RemovePod(ctx context.Context, state *framework.CycleState, podToSchedule *corev1.Pod, podInfoToRemove *framework.PodInfo, nodeInfo *framework.NodeInfo) *framework.Status {
-	if reservationutil.IsReservePod(podInfoToRemove.Pod) {
-		return nil
-	}
-
 	postFilterState, err := getPostFilterState(state)
 	if err != nil {
 		klog.ErrorS(err, "Failed to read postFilterState from cycleState", "elasticQuotaSnapshotKey", postFilterState)

pkg/scheduler/plugins/reservation/plugin.go

@@ -252,9 +252,6 @@ func (pl *Plugin) PreFilterExtensions() framework.PreFilterExtensions {
 }
 
 func (pl *Plugin) AddPod(ctx context.Context, cycleState *framework.CycleState, podToSchedule *corev1.Pod, podInfoToAdd *framework.PodInfo, nodeInfo *framework.NodeInfo) *framework.Status {
-	if reservationutil.IsReservePod(podInfoToAdd.Pod) || nodeInfo.Node() == nil {
-		return nil
-	}
 	podRequests, _ := resourceapi.PodRequestsAndLimits(podInfoToAdd.Pod)
 	if quotav1.IsZero(podRequests) {
 		return nil
@@ -283,10 +280,6 @@ func (pl *Plugin) AddPod(ctx context.Context, cycleState *framework.CycleState,
 }
 
 func (pl *Plugin) RemovePod(ctx context.Context, cycleState *framework.CycleState, podToSchedule *corev1.Pod, podInfoToRemove *framework.PodInfo, nodeInfo *framework.NodeInfo) *framework.Status {
-	if reservationutil.IsReservePod(podInfoToRemove.Pod) || nodeInfo.Node() == nil {
-		return nil
-	}
-
 	podRequests, _ := resourceapi.PodRequestsAndLimits(podInfoToRemove.Pod)
 	if quotav1.IsZero(podRequests) {
 		return nil
@@ -482,10 +475,7 @@ func fitsNode(podRequest *framework.Resource, nodeInfo *framework.NodeInfo, node
 }
 
 func (pl *Plugin) PostFilter(ctx context.Context, cycleState *framework.CycleState, pod *corev1.Pod, _ framework.NodeToStatusMap) (*framework.PostFilterResult, *framework.Status) {
-	if reservationutil.IsReservePod(pod) {
-		// return err to stop default preemption
-		return nil, framework.NewStatus(framework.Error)
-	}
+	// Implement an empty function to be compatible with existing configurations
 	return nil, framework.NewStatus(framework.Unschedulable)
 }
 

pkg/scheduler/plugins/reservation/plugin_test.go

@@ -1556,49 +1556,6 @@ func TestPreFilterExtensionRemovePod(t *testing.T) {
 	}
 }
 
-func TestPostFilter(t *testing.T) {
-	reservePod := testGetReservePod(&corev1.Pod{
-		ObjectMeta: metav1.ObjectMeta{
-			UID:  "reserve-pod-0",
-			Name: "reserve-pod-0",
-		},
-		Spec: corev1.PodSpec{
-			NodeName: "node1",
-		},
-	})
-	tests := []struct {
-		name       string
-		pod        *corev1.Pod
-		wantStatus *framework.Status
-	}{
-		{
-			name: "not reserve pod",
-			pod: &corev1.Pod{
-				ObjectMeta: metav1.ObjectMeta{
-					Name: "not-reserve",
-				},
-			},
-			wantStatus: framework.NewStatus(framework.Unschedulable),
-		},
-		{
-			name:       "reserve pod",
-			pod:        reservePod,
-			wantStatus: framework.NewStatus(framework.Error),
-		},
-	}
-	for _, tt := range tests {
-		t.Run(tt.name, func(t *testing.T) {
-			suit := newPluginTestSuitWith(t, []*corev1.Pod{reservePod}, []*corev1.Node{{ObjectMeta: metav1.ObjectMeta{Name: "node1"}}})
-			p, err := suit.pluginFactory()
-			assert.NoError(t, err)
-			pl := p.(*Plugin)
-			gotResult, status := pl.PostFilter(context.TODO(), nil, tt.pod, nil)
-			assert.Nil(t, gotResult)
-			assert.Equal(t, tt.wantStatus, status)
-		})
-	}
-}
-
 func TestFilterReservation(t *testing.T) {
 	reservation4C8G := &schedulingv1alpha1.Reservation{
 		ObjectMeta: metav1.ObjectMeta{

pkg/util/reservation/reservation.go

@@ -19,6 +19,8 @@ package reservation
 import (
 	"encoding/json"
 	"fmt"
+	"math"
+	"strconv"
 
 	corev1 "k8s.io/api/core/v1"
 	metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
@@ -95,8 +97,19 @@ func NewReservePod(r *schedulingv1alpha1.Reservation) *corev1.Pod {
 	}
 
 	if reservePod.Spec.Priority == nil {
-		reservePod.Spec.Priority = pointer.Int32(0)
+		if priorityVal, ok := r.Labels[extension.LabelPodPriority]; ok && priorityVal != "" {
+			priority, err := strconv.ParseInt(priorityVal, 10, 32)
+			if err == nil {
+				reservePod.Spec.Priority = pointer.Int32(int32(priority))
+			}
+		}
+	}
+
+	if reservePod.Spec.Priority == nil {
+		// Forces priority to be set to maximum to prevent preemption.
+		reservePod.Spec.Priority = pointer.Int32(math.MaxInt32)
 	}
+
 	reservePod.Spec.SchedulerName = GetReservationSchedulerName(r)
 
 	if IsReservationSucceeded(r) {

pkg/util/reservation/reservation_test.go

@@ -17,6 +17,7 @@ limitations under the License.
 package reservation
 
 import (
+	"math"
 	"testing"
 	"time"
 
@@ -624,7 +625,7 @@ func TestReservePod(t *testing.T) {
 					},
 				},
 			},
-			Priority: pointer.Int32(0),
+			Priority: pointer.Int32(math.MaxInt32),
 			InitContainers: []corev1.Container{
 				{
 					Name:      "test-init-container",
@@ -645,6 +646,20 @@ func TestReservePod(t *testing.T) {
 			reservation:    reservation,
 			wantReservePod: expectReservePod,
 		},
+		{
+			name: "custom priority",
+			reservation: func() *schedulingv1alpha1.Reservation {
+				r := reservation.DeepCopy()
+				r.Labels[apiext.LabelPodPriority] = "1000"
+				return r
+			}(),
+			wantReservePod: func() *corev1.Pod {
+				p := expectReservePod.DeepCopy()
+				p.Labels[apiext.LabelPodPriority] = "1000"
+				p.Spec.Priority = pointer.Int32(1000)
+				return p
+			}(),
+		},
 	}
 	for _, tt := range tests {
 		t.Run(tt.name, func(t *testing.T) {