Do not make API calls when the workload already has condition Admitted=false

pkg/controller/core/workload_controller.go

@@ -210,25 +210,25 @@ func (r *WorkloadReconciler) Reconcile(ctx context.Context, req ctrl.Request) (c
 		return ctrl.Result{}, err
 	}
 
-	if !r.queues.QueueForWorkloadExists(&wl) {
+	switch {
+	case !r.queues.QueueForWorkloadExists(&wl):
 		log.V(3).Info("Workload is inadmissible because of missing LocalQueue", "localQueue", klog.KRef(wl.Namespace, wl.Spec.QueueName))
-		workload.UnsetQuotaReservationWithCondition(&wl, "Inadmissible", fmt.Sprintf("LocalQueue %s doesn't exist", wl.Spec.QueueName))
-		err := workload.ApplyAdmissionStatus(ctx, r.client, &wl, true)
-		return ctrl.Result{}, client.IgnoreNotFound(err)
-	}
-
-	if !cqOk {
+		if workload.UnsetQuotaReservationWithCondition(&wl, "Inadmissible", fmt.Sprintf("LocalQueue %s doesn't exist", wl.Spec.QueueName)) {
+			err := workload.ApplyAdmissionStatus(ctx, r.client, &wl, true)
+			return ctrl.Result{}, client.IgnoreNotFound(err)
+		}
+	case !cqOk:
 		log.V(3).Info("Workload is inadmissible because of missing ClusterQueue", "clusterQueue", klog.KRef("", cqName))
-		workload.UnsetQuotaReservationWithCondition(&wl, "Inadmissible", fmt.Sprintf("ClusterQueue %s doesn't exist", cqName))
-		err := workload.ApplyAdmissionStatus(ctx, r.client, &wl, true)
-		return ctrl.Result{}, client.IgnoreNotFound(err)
-	}
-
-	if !r.cache.ClusterQueueActive(cqName) {
+		if workload.UnsetQuotaReservationWithCondition(&wl, "Inadmissible", fmt.Sprintf("ClusterQueue %s doesn't exist", cqName)) {
+			err := workload.ApplyAdmissionStatus(ctx, r.client, &wl, true)
+			return ctrl.Result{}, client.IgnoreNotFound(err)
+		}
+	case !r.cache.ClusterQueueActive(cqName):
 		log.V(3).Info("Workload is inadmissible because ClusterQueue is inactive", "clusterQueue", klog.KRef("", cqName))
-		workload.UnsetQuotaReservationWithCondition(&wl, "Inadmissible", fmt.Sprintf("ClusterQueue %s is inactive", cqName))
-		err := workload.ApplyAdmissionStatus(ctx, r.client, &wl, true)
-		return ctrl.Result{}, client.IgnoreNotFound(err)
+		if workload.UnsetQuotaReservationWithCondition(&wl, "Inadmissible", fmt.Sprintf("ClusterQueue %s is inactive", cqName)) {
+			err := workload.ApplyAdmissionStatus(ctx, r.client, &wl, true)
+			return ctrl.Result{}, client.IgnoreNotFound(err)
+		}
 	}
 
 	return ctrl.Result{}, nil
@@ -286,13 +286,13 @@ func (r *WorkloadReconciler) reconcileOnClusterQueueActiveState(ctx context.Cont
 
 	if err != nil || !queue.DeletionTimestamp.IsZero() {
 		log.V(3).Info("Workload is inadmissible because the ClusterQueue is terminating or missing", "clusterQueue", klog.KRef("", cqName))
-		workload.UnsetQuotaReservationWithCondition(wl, "Inadmissible", fmt.Sprintf("ClusterQueue %s is terminating or missing", cqName))
+		_ = workload.UnsetQuotaReservationWithCondition(wl, "Inadmissible", fmt.Sprintf("ClusterQueue %s is terminating or missing", cqName))
 		return true, workload.ApplyAdmissionStatus(ctx, r.client, wl, true)
 	}
 
 	if queueStopPolicy != kueue.None {
 		log.V(3).Info("Workload is inadmissible because the ClusterQueue is stopped", "clusterQueue", klog.KRef("", cqName))
-		workload.UnsetQuotaReservationWithCondition(wl, "Inadmissible", fmt.Sprintf("ClusterQueue %s is stopped", cqName))
+		_ = workload.UnsetQuotaReservationWithCondition(wl, "Inadmissible", fmt.Sprintf("ClusterQueue %s is stopped", cqName))
 		return true, workload.ApplyAdmissionStatus(ctx, r.client, wl, true)
 	}
 

pkg/controller/jobframework/reconciler.go

@@ -374,8 +374,7 @@ func (r *JobReconciler) ReconcileGenericJob(ctx context.Context, req ctrl.Reques
 		if workload.HasQuotaReservation(wl) {
 			if !job.IsActive() {
 				log.V(6).Info("The job is no longer active, clear the workloads admission")
-				workload.UnsetQuotaReservationWithCondition(wl, "Pending", evCond.Message)
-				_ = workload.SyncAdmittedCondition(wl)
+				_ = workload.UnsetQuotaReservationWithCondition(wl, "Pending", evCond.Message)
 				err := workload.ApplyAdmissionStatus(ctx, r.client, wl, true)
 				if err != nil {
 					return ctrl.Result{}, fmt.Errorf("clearing admission: %w", err)

pkg/scheduler/scheduler.go

@@ -586,10 +586,11 @@ func (s *Scheduler) requeueAndUpdate(log logr.Logger, ctx context.Context, e ent
 	log.V(2).Info("Workload re-queued", "workload", klog.KObj(e.Obj), "clusterQueue", klog.KRef("", e.ClusterQueue), "queue", klog.KRef(e.Obj.Namespace, e.Obj.Spec.QueueName), "requeueReason", e.requeueReason, "added", added)
 
 	if e.status == notNominated || e.status == skipped {
-		workload.UnsetQuotaReservationWithCondition(e.Obj, "Pending", e.inadmissibleMsg)
-		err := workload.ApplyAdmissionStatus(ctx, s.client, e.Obj, true)
-		if err != nil {
-			log.Error(err, "Could not update Workload status")
+		if workload.UnsetQuotaReservationWithCondition(e.Obj, "Pending", e.inadmissibleMsg) {
+			err := workload.ApplyAdmissionStatus(ctx, s.client, e.Obj, true)
+			if err != nil {
+				log.Error(err, "Could not update Workload status")
+			}
 		}
 		s.recorder.Eventf(e.Obj, corev1.EventTypeNormal, "Pending", api.TruncateEventMessage(e.inadmissibleMsg))
 	}

pkg/scheduler/scheduler_test.go

@@ -36,6 +36,7 @@ import (
 	"k8s.io/client-go/tools/record"
 	"k8s.io/utils/ptr"
 	"sigs.k8s.io/controller-runtime/pkg/client"
+	"sigs.k8s.io/controller-runtime/pkg/client/interceptor"
 
 	config "sigs.k8s.io/kueue/apis/config/v1beta1"
 	kueue "sigs.k8s.io/kueue/apis/kueue/v1beta1"
@@ -2004,11 +2005,12 @@ func TestRequeueAndUpdate(t *testing.T) {
 	w1 := utiltesting.MakeWorkload("w1", "ns1").Queue(q1.Name).Obj()
 
 	cases := []struct {
-		name             string
-		e                entry
-		wantWorkloads    map[string][]string
-		wantInadmissible map[string][]string
-		wantStatus       kueue.WorkloadStatus
+		name              string
+		e                 entry
+		wantWorkloads     map[string][]string
+		wantInadmissible  map[string][]string
+		wantStatus        kueue.WorkloadStatus
+		wantStatusUpdates int
 	}{
 		{
 			name: "workload didn't fit",
@@ -2028,6 +2030,7 @@ func TestRequeueAndUpdate(t *testing.T) {
 			wantInadmissible: map[string][]string{
 				"cq": {workload.Key(w1)},
 			},
+			wantStatusUpdates: 1,
 		},
 		{
 			name: "assumed",
@@ -2068,6 +2071,7 @@ func TestRequeueAndUpdate(t *testing.T) {
 			wantWorkloads: map[string][]string{
 				"cq": {workload.Key(w1)},
 			},
+			wantStatusUpdates: 1,
 		},
 	}
 
@@ -2076,8 +2080,14 @@ func TestRequeueAndUpdate(t *testing.T) {
 			ctx, log := utiltesting.ContextWithLog(t)
 			scheme := runtime.NewScheme()
 
+			updates := 0
 			objs := []client.Object{w1, q1, &corev1.Namespace{ObjectMeta: metav1.ObjectMeta{Name: "ns1"}}}
-			cl := utiltesting.NewFakeClientSSAAsSM(objs...)
+			cl := utiltesting.NewClientBuilder().WithInterceptorFuncs(interceptor.Funcs{
+				SubResourcePatch: func(ctx context.Context, client client.Client, subResourceName string, obj client.Object, patch client.Patch, opts ...client.SubResourcePatchOption) error {
+					updates++
+					return utiltesting.TreatSSAAsStrategicMerge(ctx, client, subResourceName, obj, patch, opts...)
+				},
+			}).WithObjects(objs...).WithStatusSubresource(objs...).Build()
 			broadcaster := record.NewBroadcaster()
 			recorder := broadcaster.NewRecorder(scheme, corev1.EventSource{Component: constants.AdmissionName})
 			cqCache := cache.New(cl)
@@ -2120,6 +2130,11 @@ func TestRequeueAndUpdate(t *testing.T) {
 			if diff := cmp.Diff(tc.wantStatus, updatedWl.Status, ignoreConditionTimestamps); diff != "" {
 				t.Errorf("Unexpected status after updating (-want,+got):\n%s", diff)
 			}
+			// Make sure a second call doesn't make unnecessary updates.
+			scheduler.requeueAndUpdate(log, ctx, tc.e)
+			if updates != tc.wantStatusUpdates {
+				t.Errorf("Observed %d status updates, want %d", updates, tc.wantStatusUpdates)
+			}
 		})
 	}
 }

pkg/workload/admissionchecks.go

@@ -58,8 +58,7 @@ func SyncAdmittedCondition(w *kueue.Workload) bool {
 		newCondition.Message = "The workload has not all checks ready"
 	}
 
-	apimeta.SetStatusCondition(&w.Status.Conditions, newCondition)
-	return true
+	return apimeta.SetStatusCondition(&w.Status.Conditions, newCondition)
 }
 
 // FindAdmissionCheck - returns a pointer to the check identified by checkName if found in checks.

pkg/workload/workload.go

@@ -318,19 +318,28 @@ func UpdateStatus(ctx context.Context,
 	return c.Status().Patch(ctx, newWl, client.Apply, client.FieldOwner(managerPrefix+"-"+condition.Type))
 }
 
-func UnsetQuotaReservationWithCondition(wl *kueue.Workload, reason, message string) {
+// UnsetQuotaReservationWithCondition sets the QuotaReserved condition to false and clears
+// the admission.
+// Returns whether any change was done.
+func UnsetQuotaReservationWithCondition(wl *kueue.Workload, reason, message string) bool {
 	condition := metav1.Condition{
 		Type:               kueue.WorkloadQuotaReserved,
 		Status:             metav1.ConditionFalse,
 		LastTransitionTime: metav1.Now(),
 		Reason:             reason,
 		Message:            api.TruncateConditionMessage(message),
 	}
-	apimeta.SetStatusCondition(&wl.Status.Conditions, condition)
-	wl.Status.Admission = nil
+	changed := apimeta.SetStatusCondition(&wl.Status.Conditions, condition)
+	if wl.Status.Admission != nil {
+		wl.Status.Admission = nil
+		changed = true
+	}
 
 	// Reset the admitted condition if necessary.
-	_ = SyncAdmittedCondition(wl)
+	if SyncAdmittedCondition(wl) {
+		changed = true
+	}
+	return changed
 }
 
 // BaseSSAWorkload creates a new object based on the input workload that