{"action":"opened","issue":{"url":"https://api.github.com/repos/taskgraph/taskgraph/issues/100","labels_url":"https://api.github.com/repos/taskgraph/taskgraph/issues/100/labels{/name}","comments_url":"https://api.github.com/repos/taskgraph/taskgraph/issues/100/comments","events_url":"https://api.github.com/repos/taskgraph/taskgraph/issues/100/events","html_url":"https://github.com/taskgraph/taskgraph/issues/100","id":73392689,"number":100,"title":"MapReduce architecture design","user":{"login":"fengjingchao","id":920884,"avatar_url":"https://avatars.githubusercontent.com/u/920884?v=3","gravatar_id":"","url":"https://api.github.com/users/fengjingchao","html_url":"https://github.com/fengjingchao","followers_url":"https://api.github.com/users/fengjingchao/followers","following_url":"https://api.github.com/users/fengjingchao/following{/other_user}","gists_url":"https://api.github.com/users/fengjingchao/gists{/gist_id}","starred_url":"https://api.github.com/users/fengjingchao/starred{/owner}{/repo}","subscriptions_url":"https://api.github.com/users/fengjingchao/subscriptions","organizations_url":"https://api.github.com/users/fengjingchao/orgs","repos_url":"https://api.github.com/users/fengjingchao/repos","events_url":"https://api.github.com/users/fengjingchao/events{/privacy}","received_events_url":"https://api.github.com/users/fengjingchao/received_events","type":"User","site_admin":false},"labels":[],"state":"open","locked":false,"assignee":null,"milestone":null,"comments":0,"created_at":"2015-05-05T18:31:17Z","updated_at":"2015-05-05T18:31:17Z","closed_at":null,"body":"I had a brief talk with MR folks about the current design. Here's the basic thoughts:\r\n\r\n* Master make all decisions.\r\n* Mapper and shuffler are on the same node. Mapper write the output to local disk. Shuffler shuffles the output for reducer to read\r\n* Reducer is notified by master where to read from shuffler."}}