{"action":"created","issue":{"url":"https://api.github.com/repos/apache/incubator-reef/issues/551","labels_url":"https://api.github.com/repos/apache/incubator-reef/issues/551/labels{/name}","comments_url":"https://api.github.com/repos/apache/incubator-reef/issues/551/comments","events_url":"https://api.github.com/repos/apache/incubator-reef/issues/551/events","html_url":"https://github.com/apache/incubator-reef/pull/551","id":110540627,"number":551,"title":"[REEF-817] Group comm hangs when root task is added after child tasks…","user":{"login":"jsjason","id":5705789,"avatar_url":"https://avatars.githubusercontent.com/u/5705789?v=3","gravatar_id":"","url":"https://api.github.com/users/jsjason","html_url":"https://github.com/jsjason","followers_url":"https://api.github.com/users/jsjason/followers","following_url":"https://api.github.com/users/jsjason/following{/other_user}","gists_url":"https://api.github.com/users/jsjason/gists{/gist_id}","starred_url":"https://api.github.com/users/jsjason/starred{/owner}{/repo}","subscriptions_url":"https://api.github.com/users/jsjason/subscriptions","organizations_url":"https://api.github.com/users/jsjason/orgs","repos_url":"https://api.github.com/users/jsjason/repos","events_url":"https://api.github.com/users/jsjason/events{/privacy}","received_events_url":"https://api.github.com/users/jsjason/received_events","type":"User","site_admin":false},"labels":[],"state":"open","locked":false,"assignee":null,"milestone":null,"comments":3,"created_at":"2015-10-08T21:03:26Z","updated_at":"2015-10-09T04:12:53Z","closed_at":null,"pull_request":{"url":"https://api.github.com/repos/apache/incubator-reef/pulls/551","html_url":"https://github.com/apache/incubator-reef/pull/551","diff_url":"https://github.com/apache/incubator-reef/pull/551.diff","patch_url":"https://github.com/apache/incubator-reef/pull/551.patch"},"body":"… start running\r\n\r\nThis addressed the issue by\r\n* adding a isRootPresent() method to `Topology`\r\n* making runTask() of child tasks wait until the root task has been added, in `CommunicationGroupDriverImpl`\r\n\r\nJIRA: [REEF-817](https://issues.apache.org/jira/browse/REEF-817)"},"comment":{"url":"https://api.github.com/repos/apache/incubator-reef/issues/comments/146751922","html_url":"https://github.com/apache/incubator-reef/pull/551#issuecomment-146751922","issue_url":"https://api.github.com/repos/apache/incubator-reef/issues/551","id":146751922,"user":{"login":"dongjoon-hyun","id":9700541,"avatar_url":"https://avatars.githubusercontent.com/u/9700541?v=3","gravatar_id":"","url":"https://api.github.com/users/dongjoon-hyun","html_url":"https://github.com/dongjoon-hyun","followers_url":"https://api.github.com/users/dongjoon-hyun/followers","following_url":"https://api.github.com/users/dongjoon-hyun/following{/other_user}","gists_url":"https://api.github.com/users/dongjoon-hyun/gists{/gist_id}","starred_url":"https://api.github.com/users/dongjoon-hyun/starred{/owner}{/repo}","subscriptions_url":"https://api.github.com/users/dongjoon-hyun/subscriptions","organizations_url":"https://api.github.com/users/dongjoon-hyun/orgs","repos_url":"https://api.github.com/users/dongjoon-hyun/repos","events_url":"https://api.github.com/users/dongjoon-hyun/events{/privacy}","received_events_url":"https://api.github.com/users/dongjoon-hyun/received_events","type":"User","site_admin":false},"created_at":"2015-10-09T04:12:53Z","updated_at":"2015-10-09T04:12:53Z","body":"Thank you. By the way, on Windows test, your test case fails.\r\n\r\nhttps://builds.apache.org/job/REEF-pull-request-windows3/535/\r\nhttps://builds.apache.org/job/REEF-pull-request-windows3/529/\r\n\r\n```\r\nCommunicationGroupDriverImplTest.testLateRootTask:129 number of messages sent from driver expected:<12> but was:<0>\r\n```\r\n\r\nCould you test on Windows?"}}