{"action":"created","comment":{"url":"https://api.github.com/repos/kubernetes/kubernetes/pulls/comments/48567790","id":48567790,"diff_hunk":"@@ -0,0 +1,232 @@\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 release of this document can be found\n+[here](http://releases.k8s.io/release-1.1/docs/proposals/nodeselector.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+# NodeSelector, HardNodeAffinity, and SoftNodeAffinity\n+\n+## Introduction\n+\n+This document proposes a new label selector representation, called `NodeSelector`,\n+that is similar in many ways to `LabelSelector`, but is a bit more flexible and is\n+intended to be used only for selecting nodes.\n+\n+In addition, we propose to replace the `map[string]string` in `PodSpec` that the scheduler\n+currently uses as part of restricting the set of nodes onto which a pod is\n+eligible to schedule, with a field of type `Affinity` that contains\n+* a field called `HardNodeAffinity` that will be represented by a `NodeSelector`, and\n+is thus a generalization of the current `map[string]string` but still serves the\n+purpose of restricting the set of nodes onto which the Pod can schedule\n+* a field called `SoftNodeAffinity` that specifies which nodes are\n+preferred for scheduling among those that meet the hard requirements described\n+by `HardNodeAffinity`.\n+(In practice, as discussed later, we will actually *add* the `Affinity` field\n+rather than replacing `map[string]string`, due to backward compatibility requirements.)\n+\n+`HardNodeAffinity` and `SoftNodeAffinity` allow a pod to request various properties\n+that are inherent to nodes, for example \"run this pod on a node with an Intel CPU\" or, in a\n+multi-zone cluster, \"run this pod on a node in zone Z.\"\n+([This issue](https://github.com/kubernetes/kubernetes/issues/9044) describes\n+some of the properties that a node might publish as labels, which `HardNodeAffinity`\n+and `SoftNodeAffinity` can match against.)\n+They do *not* allow a pod to request to schedule\n+(or not schedule) on a node based on what other pods are running on the node. That\n+feature is called \"inter-pod topological affinity/anti-afinity\" and is described\n+[here](https://github.com/kubernetes/kubernetes/pull/18265).\n+\n+## API\n+\n+### NodeSelector\n+\n+```go\n+// A node selector represents the union of the results of one or more label queries\n+// over a set of nodes; that is, it represents the OR of the selectors represented\n+// by the nodeSelectorTerms. An empty node selector matches all objects. A null\n+// node selector matches no objects.\n+type NodeSelector struct {\n+\t// nodeSelectorTerms is a list of node selector terms. The terms are ORed.\n+\tNodeSelectorTerms []NodeSelectorTerm `json:\"nodeSelectorTerms,omitempty\"`\n+}\n+\n+// An empty node selector term matches all objects. A null node selector term\n+// matches no objects.\n+type NodeSelectorTerm struct {\n+\t// matchExpressions is a list of node selector requirements. The requirements are ANDed.\n+\tMatchExpressions []NodeSelectorRequirement `json:\"matchExpressions,omitempty\"`\n+}\n+\n+// A node selector requirement is a selector that contains values, a key, and an operator\n+// that relates the key and values.\n+type NodeSelectorRequirement struct {\n+\t// key is the label key that the selector applies to.\n+\tKey string `json:\"key\" patchStrategy:\"merge\" patchMergeKey:\"key\"`\n+\t// operator represents a key's relationship to a set of values.\n+\t// Valid operators are In, NotIn, Exists, DoesNotExist. Gt, and Lt.\n+\tOperator NodeSelectorOperator `json:\"operator\"`\n+\t// values is an array of string values. If the operator is In or NotIn,\n+\t// the values array must be non-empty. If the operator is Exists or DoesNotExist,\n+\t// the values array must be empty. If the operator is Gt or Lt, the values\n+\t// array must have a single element, which will be interpreted as an integer.\n+    // This array is replaced during a strategic merge patch.\n+\tValues []string `json:\"values,omitempty\"`","path":"docs/proposals/nodeselector.md","position":99,"original_position":99,"commit_id":"6bd6a7b6898f913cfaea134f79c71f87daa8c746","original_commit_id":"6bd6a7b6898f913cfaea134f79c71f87daa8c746","user":{"login":"thockin","id":5595220,"avatar_url":"https://avatars.githubusercontent.com/u/5595220?v=3","gravatar_id":"","url":"https://api.github.com/users/thockin","html_url":"https://github.com/thockin","followers_url":"https://api.github.com/users/thockin/followers","following_url":"https://api.github.com/users/thockin/following{/other_user}","gists_url":"https://api.github.com/users/thockin/gists{/gist_id}","starred_url":"https://api.github.com/users/thockin/starred{/owner}{/repo}","subscriptions_url":"https://api.github.com/users/thockin/subscriptions","organizations_url":"https://api.github.com/users/thockin/orgs","repos_url":"https://api.github.com/users/thockin/repos","events_url":"https://api.github.com/users/thockin/events{/privacy}","received_events_url":"https://api.github.com/users/thockin/received_events","type":"User","site_admin":false},"body":"It's a bit of ugly that we should decide on globally.  If users are\nessentially forced to write an AST wherein the describe a numeric operation\nwith a string value, maybe we can do better - but its not clear to me, and\nI think it warrants discussion.  IntOrString is \"cute\" and human-friendly,\nbut not very friendly to automatic schema descriptions.\n\n\nOn Mon, Dec 28, 2015 at 3:55 PM, David Oppenheimer <notifications@github.com\n> wrote:\n\n> In docs/proposals/nodeselector.md\n> <https://github.com/kubernetes/kubernetes/pull/18261#discussion_r48513984>\n> :\n>\n> > +}\n> > +\n> > +// A node selector requirement is a selector that contains values, a key, and an operator\n> > +// that relates the key and values.\n> > +type NodeSelectorRequirement struct {\n> > +\t// key is the label key that the selector applies to.\n> > +\tKey string `json:\"key\" patchStrategy:\"merge\" patchMergeKey:\"key\"`\n> > +\t// operator represents a key's relationship to a set of values.\n> > +\t// Valid operators are In, NotIn, Exists, DoesNotExist. Gt, and Lt.\n> > +\tOperator NodeSelectorOperator `json:\"operator\"`\n> > +\t// values is an array of string values. If the operator is In or NotIn,\n> > +\t// the values array must be non-empty. If the operator is Exists or DoesNotExist,\n> > +\t// the values array must be empty. If the operator is Gt or Lt, the values\n> > +\t// array must have a single element, which will be interpreted as an integer.\n> > +    // This array is replaced during a strategic merge patch.\n> > +\tValues []string `json:\"values,omitempty\"`\n>\n> we use IntOrString as a type elsewhere in the API. Does that make this\n> better or worse?\n>\n> I copied this from\n>\n> https://github.com/kubernetes/kubernetes/blob/1752cf22d4bca2fcc528042c4ab1dc2ce0947165/pkg/apis/extensions/v1beta1/types.go#L715\n>\n> —\n> Reply to this email directly or view it on GitHub\n> <https://github.com/kubernetes/kubernetes/pull/18261/files#r48513984>.\n>\n","created_at":"2015-12-29T20:32:21Z","updated_at":"2015-12-29T20:32:21Z","html_url":"https://github.com/kubernetes/kubernetes/pull/18261#discussion_r48567790","pull_request_url":"https://api.github.com/repos/kubernetes/kubernetes/pulls/18261","_links":{"self":{"href":"https://api.github.com/repos/kubernetes/kubernetes/pulls/comments/48567790"},"html":{"href":"https://github.com/kubernetes/kubernetes/pull/18261#discussion_r48567790"},"pull_request":{"href":"https://api.github.com/repos/kubernetes/kubernetes/pulls/18261"}}},"pull_request":{"url":"https://api.github.com/repos/kubernetes/kubernetes/pulls/18261","id":52792624,"html_url":"https://github.com/kubernetes/kubernetes/pull/18261","diff_url":"https://github.com/kubernetes/kubernetes/pull/18261.diff","patch_url":"https://github.com/kubernetes/kubernetes/pull/18261.patch","issue_url":"https://api.github.com/repos/kubernetes/kubernetes/issues/18261","number":18261,"state":"open","locked":false,"title":"NodeSelector, NodeConstraints, NodePreferences proposal","user":{"login":"davidopp","id":8264113,"avatar_url":"https://avatars.githubusercontent.com/u/8264113?v=3","gravatar_id":"","url":"https://api.github.com/users/davidopp","html_url":"https://github.com/davidopp","followers_url":"https://api.github.com/users/davidopp/followers","following_url":"https://api.github.com/users/davidopp/following{/other_user}","gists_url":"https://api.github.com/users/davidopp/gists{/gist_id}","starred_url":"https://api.github.com/users/davidopp/starred{/owner}{/repo}","subscriptions_url":"https://api.github.com/users/davidopp/subscriptions","organizations_url":"https://api.github.com/users/davidopp/orgs","repos_url":"https://api.github.com/users/davidopp/repos","events_url":"https://api.github.com/users/davidopp/events{/privacy}","received_events_url":"https://api.github.com/users/davidopp/received_events","type":"User","site_admin":false},"body":"Ref/ #341 \r\n\r\n@bgrant0607 @soltysh @sdminonne @mikedanese @derekwaynecarr @kevin-wangzefeng @ravigadde @timothysc \r\n","created_at":"2015-12-06T22:32:22Z","updated_at":"2015-12-29T20:32:21Z","closed_at":null,"merged_at":null,"merge_commit_sha":"4fc03810992b76d5a420b4deebb305956348fa36","assignee":{"login":"bgrant0607","id":7725777,"avatar_url":"https://avatars.githubusercontent.com/u/7725777?v=3","gravatar_id":"","url":"https://api.github.com/users/bgrant0607","html_url":"https://github.com/bgrant0607","followers_url":"https://api.github.com/users/bgrant0607/followers","following_url":"https://api.github.com/users/bgrant0607/following{/other_user}","gists_url":"https://api.github.com/users/bgrant0607/gists{/gist_id}","starred_url":"https://api.github.com/users/bgrant0607/starred{/owner}{/repo}","subscriptions_url":"https://api.github.com/users/bgrant0607/subscriptions","organizations_url":"https://api.github.com/users/bgrant0607/orgs","repos_url":"https://api.github.com/users/bgrant0607/repos","events_url":"https://api.github.com/users/bgrant0607/events{/privacy}","received_events_url":"https://api.github.com/users/bgrant0607/received_events","type":"User","site_admin":false},"milestone":null,"commits_url":"https://api.github.com/repos/kubernetes/kubernetes/pulls/18261/commits","review_comments_url":"https://api.github.com/repos/kubernetes/kubernetes/pulls/18261/comments","review_comment_url":"https://api.github.com/repos/kubernetes/kubernetes/pulls/comments{/number}","comments_url":"https://api.github.com/repos/kubernetes/kubernetes/issues/18261/comments","statuses_url":"https://api.github.com/repos/kubernetes/kubernetes/statuses/6bd6a7b6898f913cfaea134f79c71f87daa8c746","head":{"label":"davidopp:nodeselector","ref":"nodeselector","sha":"6bd6a7b6898f913cfaea134f79c71f87daa8c746","user":{"login":"davidopp","id":8264113,"avatar_url":"https://avatars.githubusercontent.com/u/8264113?v=3","gravatar_id":"","url":"https://api.github.com/users/davidopp","html_url":"https://github.com/davidopp","followers_url":"https://api.github.com/users/davidopp/followers","following_url":"https://api.github.com/users/davidopp/following{/other_user}","gists_url":"https://api.github.com/users/davidopp/gists{/gist_id}","starred_url":"https://api.github.com/users/davidopp/starred{/owner}{/repo}","subscriptions_url":"https://api.github.com/users/davidopp/subscriptions","organizations_url":"https://api.github.com/users/davidopp/orgs","repos_url":"https://api.github.com/users/davidopp/repos","events_url":"https://api.github.com/users/davidopp/events{/privacy}","received_events_url":"https://api.github.com/users/davidopp/received_events","type":"User","site_admin":false},"repo":{"id":42850455,"name":"kubernetes","full_name":"davidopp/kubernetes","owner":{"login":"davidopp","id":8264113,"avatar_url":"https://avatars.githubusercontent.com/u/8264113?v=3","gravatar_id":"","url":"https://api.github.com/users/davidopp","html_url":"https://github.com/davidopp","followers_url":"https://api.github.com/users/davidopp/followers","following_url":"https://api.github.com/users/davidopp/following{/other_user}","gists_url":"https://api.github.com/users/davidopp/gists{/gist_id}","starred_url":"https://api.github.com/users/davidopp/starred{/owner}{/repo}","subscriptions_url":"https://api.github.com/users/davidopp/subscriptions","organizations_url":"https://api.github.com/users/davidopp/orgs","repos_url":"https://api.github.com/users/davidopp/repos","events_url":"https://api.github.com/users/davidopp/events{/privacy}","received_events_url":"https://api.github.com/users/davidopp/received_events","type":"User","site_admin":false},"private":false,"html_url":"https://github.com/davidopp/kubernetes","description":"Container 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