958cba1c82
Replacement is scale down stabilization window. HPA will scale down only
to max of recommendations it made during that window. More details in
https://docs.google.com/document/d/1IdG3sqgCEaRV3urPLA29IDudCufD89RYCohfBPNeWIM
102 lines
3.9 KiB
Go
102 lines
3.9 KiB
Go
/*
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Copyright 2016 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 app implements a server that runs a set of active
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// components. This includes replication controllers, service endpoints and
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// nodes.
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//
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package app
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import (
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"net/http"
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"k8s.io/apimachinery/pkg/runtime/schema"
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"k8s.io/client-go/dynamic"
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"k8s.io/client-go/scale"
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"k8s.io/kubernetes/pkg/controller/podautoscaler"
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"k8s.io/kubernetes/pkg/controller/podautoscaler/metrics"
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resourceclient "k8s.io/metrics/pkg/client/clientset/versioned/typed/metrics/v1beta1"
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"k8s.io/metrics/pkg/client/custom_metrics"
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"k8s.io/metrics/pkg/client/external_metrics"
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)
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func startHPAController(ctx ControllerContext) (http.Handler, bool, error) {
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if !ctx.AvailableResources[schema.GroupVersionResource{Group: "autoscaling", Version: "v1", Resource: "horizontalpodautoscalers"}] {
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return nil, false, nil
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}
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if ctx.ComponentConfig.HPAController.HorizontalPodAutoscalerUseRESTClients {
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// use the new-style clients if support for custom metrics is enabled
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return startHPAControllerWithRESTClient(ctx)
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}
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return startHPAControllerWithLegacyClient(ctx)
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}
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func startHPAControllerWithRESTClient(ctx ControllerContext) (http.Handler, bool, error) {
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clientConfig := ctx.ClientBuilder.ConfigOrDie("horizontal-pod-autoscaler")
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metricsClient := metrics.NewRESTMetricsClient(
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resourceclient.NewForConfigOrDie(clientConfig),
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custom_metrics.NewForConfigOrDie(clientConfig),
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external_metrics.NewForConfigOrDie(clientConfig),
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)
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return startHPAControllerWithMetricsClient(ctx, metricsClient)
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}
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func startHPAControllerWithLegacyClient(ctx ControllerContext) (http.Handler, bool, error) {
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hpaClient := ctx.ClientBuilder.ClientOrDie("horizontal-pod-autoscaler")
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metricsClient := metrics.NewHeapsterMetricsClient(
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hpaClient,
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metrics.DefaultHeapsterNamespace,
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metrics.DefaultHeapsterScheme,
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metrics.DefaultHeapsterService,
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metrics.DefaultHeapsterPort,
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)
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return startHPAControllerWithMetricsClient(ctx, metricsClient)
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}
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func startHPAControllerWithMetricsClient(ctx ControllerContext, metricsClient metrics.MetricsClient) (http.Handler, bool, error) {
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hpaClient := ctx.ClientBuilder.ClientOrDie("horizontal-pod-autoscaler")
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hpaClientConfig := ctx.ClientBuilder.ConfigOrDie("horizontal-pod-autoscaler")
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// we don't use cached discovery because DiscoveryScaleKindResolver does its own caching,
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// so we want to re-fetch every time when we actually ask for it
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scaleKindResolver := scale.NewDiscoveryScaleKindResolver(hpaClient.Discovery())
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scaleClient, err := scale.NewForConfig(hpaClientConfig, ctx.RESTMapper, dynamic.LegacyAPIPathResolverFunc, scaleKindResolver)
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if err != nil {
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return nil, false, err
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}
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replicaCalc := podautoscaler.NewReplicaCalculator(
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metricsClient,
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hpaClient.CoreV1(),
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ctx.ComponentConfig.HPAController.HorizontalPodAutoscalerTolerance,
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ctx.ComponentConfig.HPAController.HorizontalPodAutoscalerCPUInitializationPeriod.Duration,
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ctx.ComponentConfig.HPAController.HorizontalPodAutoscalerInitialReadinessDelay.Duration,
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)
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go podautoscaler.NewHorizontalController(
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hpaClient.CoreV1(),
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scaleClient,
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hpaClient.AutoscalingV1(),
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ctx.RESTMapper,
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replicaCalc,
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ctx.InformerFactory.Autoscaling().V1().HorizontalPodAutoscalers(),
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ctx.ComponentConfig.HPAController.HorizontalPodAutoscalerSyncPeriod.Duration,
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ctx.ComponentConfig.HPAController.HorizontalPodAutoscalerDownscaleStabilizationWindow.Duration,
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).Run(ctx.Stop)
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return nil, true, nil
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}
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