{"action":"created","comment":{"url":"https://api.github.com/repos/kubernetes/kubernetes/pulls/comments/63600376","id":63600376,"diff_hunk":"@@ -48,28 +49,38 @@ const (\n \n \t// Resync period for the kube controller loop.\n \tresyncPeriod = 30 * time.Minute\n+\n+\t// Duration for which the TTL cache should hold the node.\n+\tnodeCacheTTL = 180 * time.Second\n )\n \n type KubeDNS struct {\n \tkubeClient *kclient.Client\n \t// DNS domain name.\n \tdomain string\n+\t// Map of federation names that the cluster in which this kube-dns is running belongs to, to\n+\t// the corresponding domain names.\n+\tfederations map[string]string\n \t// A cache that contains all the endpoints in the system.\n \tendpointsStore kcache.Store\n \t// A cache that contains all the services in the system.\n-\tservicesStore     kcache.Store\n+\tservicesStore kcache.Store\n+\t// A TTL cache that contains some subset of nodes in the system.\n+\tnodesStore        kcache.Store","path":"pkg/dns/dns.go","position":null,"original_position":30,"commit_id":"3ad8ad1cd287055947d5a0669b3d1a61f19cbbd6","original_commit_id":"3ad8ad1cd287055947d5a0669b3d1a61f19cbbd6","user":{"login":"quinton-hoole","id":10390785,"avatar_url":"https://avatars.githubusercontent.com/u/10390785?v=3","gravatar_id":"","url":"https://api.github.com/users/quinton-hoole","html_url":"https://github.com/quinton-hoole","followers_url":"https://api.github.com/users/quinton-hoole/followers","following_url":"https://api.github.com/users/quinton-hoole/following{/other_user}","gists_url":"https://api.github.com/users/quinton-hoole/gists{/gist_id}","starred_url":"https://api.github.com/users/quinton-hoole/starred{/owner}{/repo}","subscriptions_url":"https://api.github.com/users/quinton-hoole/subscriptions","organizations_url":"https://api.github.com/users/quinton-hoole/orgs","repos_url":"https://api.github.com/users/quinton-hoole/repos","events_url":"https://api.github.com/users/quinton-hoole/events{/privacy}","received_events_url":"https://api.github.com/users/quinton-hoole/received_events","type":"User","site_admin":false},"body":"I'm not yet clear why wee need this.  Hopefully I'll find out soon.","created_at":"2016-05-17T20:46:00Z","updated_at":"2016-05-17T20:46:00Z","html_url":"https://github.com/kubernetes/kubernetes/pull/25727#discussion_r63600376","pull_request_url":"https://api.github.com/repos/kubernetes/kubernetes/pulls/25727","_links":{"self":{"href":"https://api.github.com/repos/kubernetes/kubernetes/pulls/comments/63600376"},"html":{"href":"https://github.com/kubernetes/kubernetes/pull/25727#discussion_r63600376"},"pull_request":{"href":"https://api.github.com/repos/kubernetes/kubernetes/pulls/25727"}}},"pull_request":{"url":"https://api.github.com/repos/kubernetes/kubernetes/pulls/25727","id":70324604,"html_url":"https://github.com/kubernetes/kubernetes/pull/25727","diff_url":"https://github.com/kubernetes/kubernetes/pull/25727.diff","patch_url":"https://github.com/kubernetes/kubernetes/pull/25727.patch","issue_url":"https://api.github.com/repos/kubernetes/kubernetes/issues/25727","number":25727,"state":"open","locked":false,"title":"Handle federated service name lookups in kube-dns.","user":{"login":"madhusudancs","id":10183,"avatar_url":"https://avatars.githubusercontent.com/u/10183?v=3","gravatar_id":"","url":"https://api.github.com/users/madhusudancs","html_url":"https://github.com/madhusudancs","followers_url":"https://api.github.com/users/madhusudancs/followers","following_url":"https://api.github.com/users/madhusudancs/following{/other_user}","gists_url":"https://api.github.com/users/madhusudancs/gists{/gist_id}","starred_url":"https://api.github.com/users/madhusudancs/starred{/owner}{/repo}","subscriptions_url":"https://api.github.com/users/madhusudancs/subscriptions","organizations_url":"https://api.github.com/users/madhusudancs/orgs","repos_url":"https://api.github.com/users/madhusudancs/repos","events_url":"https://api.github.com/users/madhusudancs/events{/privacy}","received_events_url":"https://api.github.com/users/madhusudancs/received_events","type":"User","site_admin":false},"body":"For the domain name queries that fail to match any records in the local\r\nkube-dns cache, we check if the queried name matches the federation\r\npattern. If it does, we send a CNAME response to the federated name.\r\n\r\nFor more details look at the comments in the code.\r\n\r\nTests are coming ...\r\n\r\nAlso, this PR is based on @ArtfulCoder's PR #23930. So please review only the last commit here.\r\n\r\nPTAL @ArtfulCoder @thockin @quinton-hoole @nikhiljindal 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