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Merge pull request #108264 from pbetkier/hpa-behavior-e2e-tests-downscale
Add e2e test for HPA behavior: decreased downscale stabilization
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commit
5c98eb5625
87
test/e2e/autoscaling/horizontal_pod_autoscaling_behavior.go
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87
test/e2e/autoscaling/horizontal_pod_autoscaling_behavior.go
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@ -0,0 +1,87 @@
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/*
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Copyright 2022 The Kubernetes Authors.
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Licensed under the Apache License, Version 2.0 (the "License");
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you may not use this file except in compliance with the License.
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You may obtain a copy of the License at
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http://www.apache.org/licenses/LICENSE-2.0
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Unless required by applicable law or agreed to in writing, software
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distributed under the License is distributed on an "AS IS" BASIS,
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WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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See the License for the specific language governing permissions and
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limitations under the License.
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*/
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package autoscaling
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import (
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"time"
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"k8s.io/kubernetes/test/e2e/framework"
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e2eautoscaling "k8s.io/kubernetes/test/e2e/framework/autoscaling"
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"github.com/onsi/ginkgo"
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)
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var _ = SIGDescribe("[Feature:HPA] [Serial] [Slow] Horizontal pod autoscaling (non-default behavior)", func() {
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f := framework.NewDefaultFramework("horizontal-pod-autoscaling")
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ginkgo.Describe("with short downscale stabilization window", func() {
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ginkgo.It("should scale down soon after the stabilization period", func() {
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ginkgo.By("setting up resource consumer and HPA")
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podCPURequest := 500
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targetCPUUtilizationPercent := 25
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usageForSingleReplica := 110
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initPods := 1
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initCPUUsageTotal := initPods * usageForSingleReplica
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downScaleStabilization := 1 * time.Minute
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rc := e2eautoscaling.NewDynamicResourceConsumer(
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"consumer", f.Namespace.Name, e2eautoscaling.KindDeployment, initPods,
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initCPUUsageTotal, 0, 0, int64(podCPURequest), 200,
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f.ClientSet, f.ScalesGetter, e2eautoscaling.Disable, e2eautoscaling.Idle,
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)
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defer rc.CleanUp()
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hpa := e2eautoscaling.CreateCPUHorizontalPodAutoscalerWithBehavior(
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rc, int32(targetCPUUtilizationPercent), 1, 5, int32(downScaleStabilization.Seconds()),
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)
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defer e2eautoscaling.DeleteHPAWithBehavior(rc, hpa.Name)
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fullWindowOfNewUsage := 30 * time.Second
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windowWithOldUsagePasses := 30 * time.Second
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newPodMetricsDelay := 15 * time.Second
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metricsAvailableDelay := fullWindowOfNewUsage + windowWithOldUsagePasses + newPodMetricsDelay
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hpaReconciliationInterval := 15 * time.Second
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actuationDelay := 10 * time.Second
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maxHPAReactionTime := metricsAvailableDelay + hpaReconciliationInterval + actuationDelay
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maxConsumeCPUDelay := 30 * time.Second
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waitForReplicasPollInterval := 20 * time.Second
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maxResourceConsumerDelay := maxConsumeCPUDelay + waitForReplicasPollInterval
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waitBuffer := 1 * time.Minute
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// making sure HPA is ready, doing its job and already has a recommendation recorded
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// for stabilization logic before lowering the consumption
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ginkgo.By("triggering scale up to record a recommendation")
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rc.ConsumeCPU(3 * usageForSingleReplica)
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rc.WaitForReplicas(3, maxHPAReactionTime+maxResourceConsumerDelay+waitBuffer)
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ginkgo.By("triggering scale down by lowering consumption")
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rc.ConsumeCPU(2 * usageForSingleReplica)
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waitStart := time.Now()
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rc.WaitForReplicas(2, downScaleStabilization+maxHPAReactionTime+maxResourceConsumerDelay+waitBuffer)
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timeWaited := time.Now().Sub(waitStart)
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ginkgo.By("verifying time waited for a scale down")
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framework.Logf("time waited for scale down: %s", timeWaited)
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framework.ExpectEqual(timeWaited > downScaleStabilization, true, "waited %s, wanted more than %s", timeWaited, downScaleStabilization)
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deadline := downScaleStabilization + maxHPAReactionTime + maxResourceConsumerDelay
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framework.ExpectEqual(timeWaited < deadline, true, "waited %s, wanted less than %s", timeWaited, deadline)
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})
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})
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})
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@ -667,6 +667,48 @@ func DeleteContainerResourceHPA(rc *ResourceConsumer, autoscalerName string) {
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rc.clientSet.AutoscalingV2().HorizontalPodAutoscalers(rc.nsName).Delete(context.TODO(), autoscalerName, metav1.DeleteOptions{})
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}
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func CreateCPUHorizontalPodAutoscalerWithBehavior(rc *ResourceConsumer, cpu, minReplicas, maxRepl, downscaleStabilizationSeconds int32) *autoscalingv2.HorizontalPodAutoscaler {
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hpa := &autoscalingv2.HorizontalPodAutoscaler{
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ObjectMeta: metav1.ObjectMeta{
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Name: rc.name,
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Namespace: rc.nsName,
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},
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Spec: autoscalingv2.HorizontalPodAutoscalerSpec{
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ScaleTargetRef: autoscalingv2.CrossVersionObjectReference{
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APIVersion: rc.kind.GroupVersion().String(),
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Kind: rc.kind.Kind,
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Name: rc.name,
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},
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MinReplicas: &minReplicas,
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MaxReplicas: maxRepl,
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Metrics: []autoscalingv2.MetricSpec{
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{
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Type: autoscalingv2.ResourceMetricSourceType,
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Resource: &autoscalingv2.ResourceMetricSource{
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Name: v1.ResourceCPU,
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Target: autoscalingv2.MetricTarget{
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Type: autoscalingv2.UtilizationMetricType,
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AverageUtilization: &cpu,
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},
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},
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},
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},
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Behavior: &autoscalingv2.HorizontalPodAutoscalerBehavior{
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ScaleDown: &autoscalingv2.HPAScalingRules{
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StabilizationWindowSeconds: &downscaleStabilizationSeconds,
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},
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},
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},
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}
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hpa, errHPA := rc.clientSet.AutoscalingV2().HorizontalPodAutoscalers(rc.nsName).Create(context.TODO(), hpa, metav1.CreateOptions{})
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framework.ExpectNoError(errHPA)
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return hpa
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}
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func DeleteHPAWithBehavior(rc *ResourceConsumer, autoscalerName string) {
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rc.clientSet.AutoscalingV2().HorizontalPodAutoscalers(rc.nsName).Delete(context.TODO(), autoscalerName, metav1.DeleteOptions{})
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}
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//SidecarStatusType type for sidecar status
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type SidecarStatusType bool
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