{"action":"created","comment":{"url":"https://api.github.com/repos/kubernetes/kubernetes/pulls/comments/39754844","id":39754844,"diff_hunk":"@@ -0,0 +1,151 @@\n+/*\n+Copyright 2015 The Kubernetes Authors All rights reserved.\n+\n+Licensed under the Apache License, Version 2.0 (the \"License\");\n+you may not use this file except in compliance with the License.\n+You may obtain a copy of the License at\n+\n+    http://www.apache.org/licenses/LICENSE-2.0\n+\n+Unless required by applicable law or agreed to in writing, software\n+distributed under the License is distributed on an \"AS IS\" BASIS,\n+WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.\n+See the License for the specific language governing permissions and\n+limitations under the License.\n+*/\n+\n+package node\n+\n+import (\n+\t\"reflect\"\n+\t\"time\"\n+\n+\tlog \"github.com/golang/glog\"\n+\t\"k8s.io/kubernetes/contrib/mesos/pkg/queue\"\n+\t\"k8s.io/kubernetes/contrib/mesos/pkg/runtime\"\n+\t\"k8s.io/kubernetes/pkg/api\"\n+\t\"k8s.io/kubernetes/pkg/client/cache\"\n+\tclient \"k8s.io/kubernetes/pkg/client/unversioned\"\n+)\n+\n+const (\n+\tdefaultInboxSize = 1000\n+)\n+\n+type Registrator interface {\n+\tRegister(hostName string, labels map[string]string) (bool, error)\n+\tRun(terminate <-chan struct{}) error\n+}\n+\n+type registration struct {\n+\thostName string\n+\tlabels   map[string]string\n+}\n+\n+func (r *registration) Copy() queue.Copyable {\n+\treturn &registration{\n+\t\thostName: r.hostName,\n+\t\tlabels:   r.labels, // labels are never changed, hence just copy the slice\n+\t}\n+}\n+\n+func (r *registration) GetUID() string {\n+\treturn r.hostName\n+}\n+\n+func (r *registration) Value() queue.UniqueCopyable {\n+\treturn r\n+}\n+\n+func (r *registration) Is(types queue.EventType) bool {","path":"contrib/mesos/pkg/node/registrator.go","position":60,"original_position":60,"commit_id":"08bc56db37210b85a1c9b0e62a339b3becce2ffd","original_commit_id":"08bc56db37210b85a1c9b0e62a339b3becce2ffd","user":{"login":"sttts","id":730123,"avatar_url":"https://avatars.githubusercontent.com/u/730123?v=3","gravatar_id":"","url":"https://api.github.com/users/sttts","html_url":"https://github.com/sttts","followers_url":"https://api.github.com/users/sttts/followers","following_url":"https://api.github.com/users/sttts/following{/other_user}","gists_url":"https://api.github.com/users/sttts/gists{/gist_id}","starred_url":"https://api.github.com/users/sttts/starred{/owner}{/repo}","subscriptions_url":"https://api.github.com/users/sttts/subscriptions","organizations_url":"https://api.github.com/users/sttts/orgs","repos_url":"https://api.github.com/users/sttts/repos","events_url":"https://api.github.com/users/sttts/events{/privacy}","received_events_url":"https://api.github.com/users/sttts/received_events","type":"User","site_admin":false},"body":"Without the inbox yes.","created_at":"2015-09-17T14:54:23Z","updated_at":"2015-09-17T14:54:23Z","html_url":"https://github.com/kubernetes/kubernetes/pull/13857#discussion_r39754844","pull_request_url":"https://api.github.com/repos/kubernetes/kubernetes/pulls/13857","_links":{"self":{"href":"https://api.github.com/repos/kubernetes/kubernetes/pulls/comments/39754844"},"html":{"href":"https://github.com/kubernetes/kubernetes/pull/13857#discussion_r39754844"},"pull_request":{"href":"https://api.github.com/repos/kubernetes/kubernetes/pulls/13857"}}},"pull_request":{"url":"https://api.github.com/repos/kubernetes/kubernetes/pulls/13857","id":44771945,"html_url":"https://github.com/kubernetes/kubernetes/pull/13857","diff_url":"https://github.com/kubernetes/kubernetes/pull/13857.diff","patch_url":"https://github.com/kubernetes/kubernetes/pull/13857.patch","issue_url":"https://api.github.com/repos/kubernetes/kubernetes/issues/13857","number":13857,"state":"open","locked":false,"title":"WIP/MESOS: add labels to node api object from minion and update them from executor","user":{"login":"sttts","id":730123,"avatar_url":"https://avatars.githubusercontent.com/u/730123?v=3","gravatar_id":"","url":"https://api.github.com/users/sttts","html_url":"https://github.com/sttts","followers_url":"https://api.github.com/users/sttts/followers","following_url":"https://api.github.com/users/sttts/following{/other_user}","gists_url":"https://api.github.com/users/sttts/gists{/gist_id}","starred_url":"https://api.github.com/users/sttts/starred{/owner}{/repo}","subscriptions_url":"https://api.github.com/users/sttts/subscriptions","organizations_url":"https://api.github.com/users/sttts/orgs","repos_url":"https://api.github.com/users/sttts/repos","events_url":"https://api.github.com/users/sttts/events{/privacy}","received_events_url":"https://api.github.com/users/sttts/received_events","type":"User","site_admin":false},"body":"This PR converts Mesos slave attributes into k8s node labels, using the `k8s.mesosphere.io/*` label namespace.\r\n\r\nI.e. a slave with attribute `rack: a` will get the k8s node label `k8s.mesosphere.io/rack: a`.\r\n\r\nNode labels must be synchronously applied to a node before a pod is launched because the kubelet will check whether the labels match to a pod's NodeSelector.  Therefore, the nodes are pre-created from the minion, before launching the executor which instantiates the kubelet.\r\n\r\nThe overall picture is this:\r\n\r\n- launch a task. Mesos will launch the minion.\r\n- pre-create the node api object from the minion process (or update it if already existing)\r\n- launche the executor which launches the kubelet (later the kubelet will be launched out-of-process by the minion) from the minion.\r\n- the executor registers or reregisters with Mesos and get slave attributes. The executor then will update the node object (necessary in case the labels changed e.g. because the slave was restarted with new attributes).\r\n- the kubelet watches the node object on the apiserver and will notice label changes.\r\n\r\nxref 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