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hpa: Prevent scaling below MinReplicas if desiredReplicas is zero

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This commit is contained in:
Johannes Würbach 2017-07-16 21:36:08 +02:00
parent b516a521b1
commit a99d988e3b
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GPG Key ID: 74DB0F4D956CCCE3
2 changed files with 23 additions and 4 deletions
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8
pkg/controller/podautoscaler/horizontal.go
View File

@ -450,14 +450,14 @@ func (a *HorizontalController) reconcileAutoscaler(hpav1Shared *autoscalingv1.Ho
case desiredReplicas > scaleUpLimit: case desiredReplicas > scaleUpLimit:
setCondition(hpa, autoscalingv2.ScalingLimited, v1.ConditionTrue, "ScaleUpLimit", "the desired replica count is increasing faster than the maximum scale rate") setCondition(hpa, autoscalingv2.ScalingLimited, v1.ConditionTrue, "ScaleUpLimit", "the desired replica count is increasing faster than the maximum scale rate")
desiredReplicas = scaleUpLimit desiredReplicas = scaleUpLimit
case desiredReplicas == 0:
// never scale down to 0, reserved for disabling autoscaling
setCondition(hpa, autoscalingv2.ScalingLimited, v1.ConditionTrue, "TooFewReplicas", "the desired replica count was zero")
desiredReplicas = 1
case hpa.Spec.MinReplicas != nil && desiredReplicas < *hpa.Spec.MinReplicas: case hpa.Spec.MinReplicas != nil && desiredReplicas < *hpa.Spec.MinReplicas:
// make sure we aren't below our minimum // make sure we aren't below our minimum
setCondition(hpa, autoscalingv2.ScalingLimited, v1.ConditionTrue, "TooFewReplicas", "the desired replica count was less than the minimum replica count") setCondition(hpa, autoscalingv2.ScalingLimited, v1.ConditionTrue, "TooFewReplicas", "the desired replica count was less than the minimum replica count")
desiredReplicas = *hpa.Spec.MinReplicas desiredReplicas = *hpa.Spec.MinReplicas
case desiredReplicas == 0:
// never scale down to 0, reserved for disabling autoscaling
setCondition(hpa, autoscalingv2.ScalingLimited, v1.ConditionTrue, "TooFewReplicas", "the desired replica count was zero")
desiredReplicas = 1
case desiredReplicas > hpa.Spec.MaxReplicas: case desiredReplicas > hpa.Spec.MaxReplicas:
// make sure we aren't above our maximum // make sure we aren't above our maximum
setCondition(hpa, autoscalingv2.ScalingLimited, v1.ConditionTrue, "TooManyReplicas", "the desired replica count was more than the maximum replica count") setCondition(hpa, autoscalingv2.ScalingLimited, v1.ConditionTrue, "TooManyReplicas", "the desired replica count was more than the maximum replica count")

19
pkg/controller/podautoscaler/horizontal_test.go
View File

@ -994,6 +994,25 @@ func TestMinReplicas(t *testing.T) {
tc.runTest(t) tc.runTest(t)
} }
func TestMinReplicasDesiredZero(t *testing.T) {
tc := testCase{
minReplicas: 2,
maxReplicas: 5,
initialReplicas: 3,
desiredReplicas: 2,
CPUTarget: 90,
reportedLevels: []uint64{0, 0, 0},
reportedCPURequests: []resource.Quantity{resource.MustParse("0.9"), resource.MustParse("1.0"), resource.MustParse("1.1")},
useMetricsApi: true,
expectedConditions: statusOkWithOverrides(autoscalingv2.HorizontalPodAutoscalerCondition{
Type: autoscalingv2.ScalingLimited,
Status: v1.ConditionTrue,
Reason: "TooFewReplicas",
}),
}
tc.runTest(t)
}
func TestZeroReplicas(t *testing.T) { func TestZeroReplicas(t *testing.T) {
tc := testCase{ tc := testCase{
minReplicas: 3, minReplicas: 3,