{"action":"created","comment":{"url":"https://api.github.com/repos/kubernetes/kubernetes/pulls/comments/37628906","id":37628906,"diff_hunk":"@@ -0,0 +1,275 @@\n+<!-- BEGIN MUNGE: UNVERSIONED_WARNING -->\n+\n+<!-- BEGIN STRIP_FOR_RELEASE -->\n+\n+<img src=\"http://kubernetes.io/img/warning.png\" alt=\"WARNING\"\n+     width=\"25\" height=\"25\">\n+<img src=\"http://kubernetes.io/img/warning.png\" alt=\"WARNING\"\n+     width=\"25\" height=\"25\">\n+<img src=\"http://kubernetes.io/img/warning.png\" alt=\"WARNING\"\n+     width=\"25\" height=\"25\">\n+<img src=\"http://kubernetes.io/img/warning.png\" alt=\"WARNING\"\n+     width=\"25\" height=\"25\">\n+<img src=\"http://kubernetes.io/img/warning.png\" alt=\"WARNING\"\n+     width=\"25\" height=\"25\">\n+\n+<h2>PLEASE NOTE: This document applies to the HEAD of the source tree</h2>\n+\n+If you are using a released version of Kubernetes, you should\n+refer to the docs that go with that version.\n+\n+<strong>\n+The latest 1.0.x release of this document can be found\n+[here](http://releases.k8s.io/release-1.0/docs/proposals/horizontal-pod-autoscaler.md).\n+\n+Documentation for other releases can be found at\n+[releases.k8s.io](http://releases.k8s.io).\n+</strong>\n+--\n+\n+<!-- END STRIP_FOR_RELEASE -->\n+\n+<!-- END MUNGE: UNVERSIONED_WARNING -->\n+\n+# Horizontal Pod Autoscaling\n+\n+**Author**: Jerzy Szczepkowski (@jszczepkowski)\n+\n+## Preface\n+\n+This document briefly describes the design of the horizontal autoscaler for pods.\n+The autoscaler (implemented as a kubernetes control loop) will be responsible for automatically\n+choosing and setting the number of pods of a given type that run in a kubernetes cluster.\n+\n+This proposal supersedes [autoscaling.md](http://releases.k8s.io/release-1.0/docs/proposals/autoscaling.md).\n+\n+## Overview\n+\n+The usage of a serving application usually vary over time: sometimes the demand for the application rises,\n+and sometimes it drops.\n+In Kubernetes version 1.0, a user can only manually set the number of serving pods.\n+Our aim is to provide a mechanism for the automatic adjustment of the number of pods based on usage statistics.\n+\n+## Scale Subresource\n+\n+We are going to introduce Scale subresource and implement horizontal autoscaling of pods based on it.\n+Scale subresource will be supported for replication controllers and deployments.\n+HorizontalPodAutoscaler object will be bound with exactly one Scale subresource and will be\n+autoscaling associated replication controller/deployment through it.\n+\n+Scale subresource will be present for replication controller or deployment under the following paths:\n+\n+```api/vX/replicationcontrollers/myrc/scale```\n+\n+```api/vX/deployments/mydeployment/scale```\n+\n+It will have the following structure:\n+\n+```go\n+// Scale subresource, applicable to ReplicationControllers and (in future) Deployment.\n+type Scale struct {\n+\tapi.TypeMeta\n+\tapi.ObjectMeta\n+\n+\t// Spec defines the behavior of the scale.\n+\tSpec ScaleSpec\n+\n+\t// Status represents the current status of the scale.\n+\tStatus ScaleStatus\n+}\n+\n+// ScaleSpec describes the attributes a Scale subresource\n+type ScaleSpec struct {\n+\t// Replicas is the number of desired replicas.\n+\tReplicas int\n+}\n+\n+// ScaleStatus represents the current status of a Scale subresource.\n+type ScaleStatus struct {\n+\t// Replicas is the number of actual replicas.\n+\tReplicas int\n+\n+\t// Selector is a label query over pods that should match the replicas count.\n+\tSelector map[string]string\n+}\n+\n+```\n+\n+Writing ```ScaleSpec.Count``` will resize the replication controller/deployment associated with\n+the given Scale subresource.\n+```ScaleStatus.Count``` will report how many pods are currently running in the replication controller/deployment,\n+and ```ScaleStatus.PodSelector``` will return selector for the pods.\n+\n+## HorizontalPodAutoscaler Object\n+\n+We will introduce HorizontalPodAutoscaler object, it will be accessible under:\n+\n+```\n+api/vX/horizontalpodautoscalers/myautoscaler\n+```\n+\n+It will have the following structure:\n+\n+```go\n+// HorizontalPodAutoscaler represents the configuration of a horizontal pod autoscaler.\n+type HorizontalPodAutoscaler struct {\n+\tapi.TypeMeta\n+\tapi.ObjectMeta\n+\n+\t// Spec defines the behaviour of autoscaler.\n+\tSpec HorizontalPodAutoscalerSpec\n+\n+\t// Status represents the current information about the autoscaler.\n+\tStatus HorizontalPodAutoscalerStatus\n+}\n+\n+// HorizontalPodAutoscalerSpec is the specification of a horizontal pod autoscaler.\n+type HorizontalPodAutoscalerSpec struct {\n+\t// ScaleRef is a reference to Scale subresource. HorizontalPodAutoscaler will learn the current\n+\t// resource consumption from its status, and will set the desired number of pods by modyfying its spec.\n+\tScaleRef *SubresourceReference\n+\t// MinCount is the lower limit for the number of pods that can be set by the autoscaler.\n+\tMinCount int\n+\t// MaxCount is the upper limit for the number of pods that can be set by the autoscaler.\n+\t// It cannot be smaller than MinCount.\n+\tMaxCount int\n+\t// Target is the target average consumption of the given resource that the autoscaler will try\n+\t// to maintain by adjusting the desired number of pods.\n+\t// Currently this can be either \"cpu\" or \"memory\".\n+\tTarget ResourceConsumption\n+}\n+\n+// HorizontalPodAutoscalerStatus contains the current status of a horizontal pod autoscaler\n+type HorizontalPodAutoscalerStatus struct {\n+\t// CurrentReplicas is the number of replicas of pods managed by this autoscaler.\n+\tCurrentReplicas int\n+\n+\t// DesiredReplicas is the desired number of replicas of pods managed by this autoscaler.\n+\t// The number may be different because pod downscaling is someteimes delayed to keep the number\n+\t// of pods stable.\n+\tDesiredReplicas int\n+\n+\t// CurrentConsumption is the current average consumption of the given resource that the autoscaler will\n+\t// try to maintain by adjusting the desired number of pods.\n+\t// Two types of resources are supported: \"cpu\" and \"memory\".\n+\tCurrentConsumption ResourceConsumption\n+\n+\t// LastScaleTimestamp is the last time the HorizontalPodAutoscaler scaled the number of pods.\n+\t// This is used by the autoscaler to controll how often the number of pods is changed.\n+\tLastScaleTimestamp *util.Time","path":"docs/proposals/horizontal-pod-autoscaler.md","position":159,"original_position":159,"commit_id":"161f3f1ddcb4a71665c566cd5d1971570052fed4","original_commit_id":"161f3f1ddcb4a71665c566cd5d1971570052fed4","user":{"login":"jszczepkowski","id":10820769,"avatar_url":"https://avatars.githubusercontent.com/u/10820769?v=3","gravatar_id":"","url":"https://api.github.com/users/jszczepkowski","html_url":"https://github.com/jszczepkowski","followers_url":"https://api.github.com/users/jszczepkowski/followers","following_url":"https://api.github.com/users/jszczepkowski/following{/other_user}","gists_url":"https://api.github.com/users/jszczepkowski/gists{/gist_id}","starred_url":"https://api.github.com/users/jszczepkowski/starred{/owner}{/repo}","subscriptions_url":"https://api.github.com/users/jszczepkowski/subscriptions","organizations_url":"https://api.github.com/users/jszczepkowski/orgs","repos_url":"https://api.github.com/users/jszczepkowski/repos","events_url":"https://api.github.com/users/jszczepkowski/events{/privacy}","received_events_url":"https://api.github.com/users/jszczepkowski/received_events","type":"User","site_admin":false},"body":"Ack.","created_at":"2015-08-21T12:21:59Z","updated_at":"2015-08-21T12:21:59Z","html_url":"https://github.com/kubernetes/kubernetes/pull/12859#discussion_r37628906","pull_request_url":"https://api.github.com/repos/kubernetes/kubernetes/pulls/12859","_links":{"self":{"href":"https://api.github.com/repos/kubernetes/kubernetes/pulls/comments/37628906"},"html":{"href":"https://github.com/kubernetes/kubernetes/pull/12859#discussion_r37628906"},"pull_request":{"href":"https://api.github.com/repos/kubernetes/kubernetes/pulls/12859"}}},"pull_request":{"url":"https://api.github.com/repos/kubernetes/kubernetes/pulls/12859","id":42698192,"html_url":"https://github.com/kubernetes/kubernetes/pull/12859","diff_url":"https://github.com/kubernetes/kubernetes/pull/12859.diff","patch_url":"https://github.com/kubernetes/kubernetes/pull/12859.patch","issue_url":"https://api.github.com/repos/kubernetes/kubernetes/issues/12859","number":12859,"state":"open","locked":false,"title":"Design proposal: Horizontal Pod Autoscaler.","user":{"login":"jszczepkowski","id":10820769,"avatar_url":"https://avatars.githubusercontent.com/u/10820769?v=3","gravatar_id":"","url":"https://api.github.com/users/jszczepkowski","html_url":"https://github.com/jszczepkowski","followers_url":"https://api.github.com/users/jszczepkowski/followers","following_url":"https://api.github.com/users/jszczepkowski/following{/other_user}","gists_url":"https://api.github.com/users/jszczepkowski/gists{/gist_id}","starred_url":"https://api.github.com/users/jszczepkowski/starred{/owner}{/repo}","subscriptions_url":"https://api.github.com/users/jszczepkowski/subscriptions","organizations_url":"https://api.github.com/users/jszczepkowski/orgs","repos_url":"https://api.github.com/users/jszczepkowski/repos","events_url":"https://api.github.com/users/jszczepkowski/events{/privacy}","received_events_url":"https://api.github.com/users/jszczepkowski/received_events","type":"User","site_admin":false},"body":"Added design proposal for Horizontal Pod Autoscaler. 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