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Updating the replicas for kserve #738

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a64260a
Updating the replicas for kserve
visheshtanksale Jan 22, 2026
630cfdf
Removing unused variable in test
visheshtanksale Jan 22, 2026
d67363e
Addressing review comments
visheshtanksale Jan 26, 2026
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46 changes: 26 additions & 20 deletions api/apps/v1alpha1/nimservice_types.go
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Original file line number Diff line number Diff line change
Expand Up @@ -123,7 +123,7 @@ type NIMServiceSpec struct {
Scale Autoscaling `json:"scale,omitempty"`
SchedulerName string `json:"schedulerName,omitempty"`
Metrics Metrics `json:"metrics,omitempty"`
// +kubebuilder:validation:Minimum=1
// +kubebuilder:validation:Minimum=0
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@varunrsekar varunrsekar Jan 22, 2026

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For non-kserve NIMs, is it expected to be able to deploy it with 0 replicas?

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@shivamerla shivamerla Jan 22, 2026 •
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Based on the issue linked looks like the user want to spin it down to 0 to optimize GPU usage as we don't have scale-to-zero support yet. @visheshtanksale if we want to support this then we need to avoid trying to set model status as well and set the status as NotReady or introduce a new state.

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@visheshtanksale visheshtanksale Jan 22, 2026

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Both for standalone and kserve inferencePlatform, when the NIMService is scaled down to zero the status is set to NotReady. I think this state is good enough.

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@varunrsekar varunrsekar Jan 23, 2026

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Okay I remember now. We had already added support to avoid querying the model details if the deployment is scaled down. This change makes sense with that context.

Replicas *int32 `json:"replicas,omitempty"`
UserID *int64 `json:"userID,omitempty"`
GroupID *int64 `json:"groupID,omitempty"`
Expand Down Expand Up @@ -1638,26 +1638,32 @@ func (n *NIMService) GetInferenceServiceParams(
delete(params.PodAnnotations, utils.NvidiaAnnotationParentSpecHashKey)

// Set template spec
if !n.IsAutoScalingEnabled() || !utils.IsKServeStandardDeploymentMode(deploymentMode) {
params.MinReplicas = n.GetReplicas()
} else {
params.Annotations[kserveconstants.AutoscalerClass] = string(kserveconstants.AutoscalerClassHPA)
if utils.IsKServeStandardDeploymentMode(deploymentMode) {
if n.IsAutoScalingEnabled() {
params.Annotations[kserveconstants.AutoscalerClass] = string(kserveconstants.AutoscalerClassHPA)

minReplicas, maxReplicas, metric, metricType, target := n.GetInferenceServiceHPAParams()
if minReplicas != nil {
params.MinReplicas = minReplicas
}
if maxReplicas > 0 {
params.MaxReplicas = ptr.To[int32](maxReplicas)
}
if metric != "" {
params.ScaleMetric = metric
}
if metricType != "" {
params.ScaleMetricType = metricType
}
if target > 0 {
params.ScaleTarget = ptr.To(target)
minReplicas, maxReplicas, metric, metricType, target := n.GetInferenceServiceHPAParams()
if minReplicas != nil {
params.MinReplicas = minReplicas
}
if maxReplicas > 0 {
params.MaxReplicas = ptr.To[int32](maxReplicas)
}
if metric != "" {
params.ScaleMetric = metric
}
if metricType != "" {
params.ScaleMetricType = metricType
}
if target > 0 {
params.ScaleTarget = ptr.To(target)
}
} else {
params.MinReplicas = ptr.To[int32](0)
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@shivamerla shivamerla Jan 22, 2026

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For serverless/knative mode, if auto-scaling is enabled, shouldn't we be setting predictor.minReplicas to either scale.minReplicas or the annotation value?

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@visheshtanksale visheshtanksale Jan 22, 2026

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For serverless/knative mode just passing the min max annotation under the spec.predictor.annotations is sufficient.

params.MaxReplicas = ptr.To[int32](0)
params.ScaleMetric = ""
params.ScaleMetricType = ""
params.ScaleTarget = nil
}
}

Expand Down
274 changes: 274 additions & 0 deletions api/apps/v1alpha1/nimservice_types_test.go
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Expand Up @@ -595,3 +595,277 @@ func TestGetProxyCertConfigMap(t *testing.T) {
})
}
}

// TestGetInferenceServiceParams tests the GetInferenceServiceParams function with different autoscaling and deployment mode combinations.
func TestGetInferenceServiceParams(t *testing.T) {
tests := []struct {
name string
nimService *NIMService
deploymentMode string
expectHPAAnnotation bool
expectMinReplicas bool
}{
{
name: "Autoscaling enabled with RawDeployment mode",
nimService: &NIMService{
Spec: NIMServiceSpec{
Image: Image{
Repository: "test-repo",
Tag: "test-tag",
},
AuthSecret: "test-secret",
Scale: Autoscaling{
Enabled: ptr.To(true),
HPA: HorizontalPodAutoscalerSpec{
MinReplicas: ptr.To[int32](1),
MaxReplicas: 5,
},
},
Expose: Expose{
Service: Service{
Port: ptr.To[int32](8000),
},
},
},
},
deploymentMode: "RawDeployment",
expectHPAAnnotation: true,
expectMinReplicas: true,
},
{
name: "Autoscaling disabled with Standard deployment mode",
nimService: &NIMService{
Spec: NIMServiceSpec{
Image: Image{
Repository: "test-repo",
Tag: "test-tag",
},
AuthSecret: "test-secret",
Scale: Autoscaling{
Enabled: ptr.To(false),
},
Replicas: ptr.To[int32](2),
Expose: Expose{
Service: Service{
Port: ptr.To[int32](8000),
},
},
},
},
deploymentMode: "Standard",
expectHPAAnnotation: true, // Standard mode should enable HPA
expectMinReplicas: false,
},
{
name: "Autoscaling disabled with Knative deployment mode",
nimService: &NIMService{
Spec: NIMServiceSpec{
Image: Image{
Repository: "test-repo",
Tag: "test-tag",
},
AuthSecret: "test-secret",
Scale: Autoscaling{
Enabled: ptr.To(false),
},
Replicas: ptr.To[int32](2),
Expose: Expose{
Service: Service{
Port: ptr.To[int32](8000),
},
},
},
},
deploymentMode: "Knative",
expectHPAAnnotation: false, // Neither autoscaling nor standard mode
expectMinReplicas: false,
},
{
name: "Autoscaling enabled with Standard deployment mode",
nimService: &NIMService{
Spec: NIMServiceSpec{
Image: Image{
Repository: "test-repo",
Tag: "test-tag",
},
AuthSecret: "test-secret",
Scale: Autoscaling{
Enabled: ptr.To(true),
HPA: HorizontalPodAutoscalerSpec{
MinReplicas: ptr.To[int32](1),
MaxReplicas: 10,
},
},
Expose: Expose{
Service: Service{
Port: ptr.To[int32](8000),
},
},
},
},
deploymentMode: "Standard",
expectHPAAnnotation: true, // Both conditions met
expectMinReplicas: true,
},
{
name: "Zero replicas with autoscaling disabled",
nimService: &NIMService{
Spec: NIMServiceSpec{
Image: Image{
Repository: "test-repo",
Tag: "test-tag",
},
AuthSecret: "test-secret",
Scale: Autoscaling{
Enabled: ptr.To(false),
},
Replicas: ptr.To[int32](0), // Zero replicas should be valid now
Expose: Expose{
Service: Service{
Port: ptr.To[int32](8000),
},
},
},
},
deploymentMode: "Knative",
expectHPAAnnotation: false,
expectMinReplicas: false,
},
}

for _, tt := range tests {
t.Run(tt.name, func(t *testing.T) {

// Test autoscaling enabled state
isAutoScalingEnabled := tt.nimService.IsAutoScalingEnabled()
if tt.expectHPAAnnotation && !isAutoScalingEnabled && tt.deploymentMode != "Standard" && tt.deploymentMode != "RawDeployment" {
t.Errorf("Expected autoscaling to be enabled or standard deployment mode, but neither condition is met")
}

// Test replica validation
if tt.nimService.Spec.Replicas != nil {
if *tt.nimService.Spec.Replicas < 0 {
t.Errorf("Replicas should not be negative, got %d", *tt.nimService.Spec.Replicas)
}
// Verify zero replicas are now allowed (changed from minimum of 1 to 0)
if *tt.nimService.Spec.Replicas == 0 {
// This should be valid now - test passes if we reach here
t.Logf("Zero replicas correctly allowed")
}
}

// Verify GetReplicas works correctly
if tt.expectMinReplicas {
replicas := tt.nimService.GetReplicas()
if replicas == nil {
t.Errorf("Expected replicas to be set for HPA, but got nil")
}
}
})
}
}

// TestReplicasMinimumValidation tests that zero replicas are now allowed.
func TestReplicasMinimumValidation(t *testing.T) {
tests := []struct {
name string
replicas *int32
expectPass bool
}{
{
name: "Zero replicas should be valid",
replicas: ptr.To[int32](0),
expectPass: true,
},
{
name: "One replica should be valid",
replicas: ptr.To[int32](1),
expectPass: true,
},
{
name: "Multiple replicas should be valid",
replicas: ptr.To[int32](5),
expectPass: true,
},
{
name: "Nil replicas should be valid",
replicas: nil,
expectPass: true,
},
}

for _, tt := range tests {
t.Run(tt.name, func(t *testing.T) {
nimService := &NIMService{
Spec: NIMServiceSpec{
Replicas: tt.replicas,
},
}

// Validate that replicas field accepts the value
if nimService.Spec.Replicas != nil {
if *nimService.Spec.Replicas < 0 {
if tt.expectPass {
t.Errorf("Expected replicas %d to be valid, but validation would fail", *nimService.Spec.Replicas)
}
} else {
if !tt.expectPass {
t.Errorf("Expected replicas %d to be invalid, but validation would pass", *nimService.Spec.Replicas)
}
}
}

// Test GetReplicas method
replicas := nimService.GetReplicas()
if tt.replicas != nil && replicas != nil {
if *replicas != *tt.replicas {
t.Errorf("GetReplicas() = %d, want %d", *replicas, *tt.replicas)
}
}
})
}
}

// TestIsAutoScalingEnabled tests the autoscaling enabled detection.
func TestIsAutoScalingEnabled(t *testing.T) {
tests := []struct {
name string
scale Autoscaling
expected bool
}{
{
name: "Autoscaling explicitly enabled",
scale: Autoscaling{
Enabled: ptr.To(true),
},
expected: true,
},
{
name: "Autoscaling explicitly disabled",
scale: Autoscaling{
Enabled: ptr.To(false),
},
expected: false,
},
{
name: "Autoscaling not set (nil)",
scale: Autoscaling{},
expected: false,
},
}

for _, tt := range tests {
t.Run(tt.name, func(t *testing.T) {
nimService := &NIMService{
Spec: NIMServiceSpec{
Scale: tt.scale,
},
}

result := nimService.IsAutoScalingEnabled()
if result != tt.expected {
t.Errorf("IsAutoScalingEnabled() = %v, want %v", result, tt.expected)
}
})
}
}
2 changes: 1 addition & 1 deletion bundle/manifests/apps.nvidia.com_nimpipelines.yaml
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Expand Up @@ -2626,7 +2626,7 @@ spec:
type: object
replicas:
format: int32
minimum: 1
minimum: 0
type: integer
resources:
description: |-
Expand Down
2 changes: 1 addition & 1 deletion bundle/manifests/apps.nvidia.com_nimservices.yaml
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Expand Up @@ -2538,7 +2538,7 @@ spec:
type: object
replicas:
format: int32
minimum: 1
minimum: 0
type: integer
resources:
description: |-
Expand Down
2 changes: 1 addition & 1 deletion config/crd/bases/apps.nvidia.com_nimpipelines.yaml
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Expand Up @@ -2626,7 +2626,7 @@ spec:
type: object
replicas:
format: int32
minimum: 1
minimum: 0
type: integer
resources:
description: |-
Expand Down
2 changes: 1 addition & 1 deletion config/crd/bases/apps.nvidia.com_nimservices.yaml
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Original file line number Diff line number Diff line change
Expand Up @@ -2538,7 +2538,7 @@ spec:
type: object
replicas:
format: int32
minimum: 1
minimum: 0
type: integer
resources:
description: |-
Expand Down
2 changes: 1 addition & 1 deletion deployments/helm/k8s-nim-operator/crds/apps.nvidia.com_nimpipelines.yaml
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Expand Up @@ -2626,7 +2626,7 @@ spec:
type: object
replicas:
format: int32
minimum: 1
minimum: 0
type: integer
resources:
description: |-
Expand Down
2 changes: 1 addition & 1 deletion deployments/helm/k8s-nim-operator/crds/apps.nvidia.com_nimservices.yaml
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Expand Up @@ -2538,7 +2538,7 @@ spec:
type: object
replicas:
format: int32
minimum: 1
minimum: 0
type: integer
resources:
description: |-
Expand Down
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