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Adding IObserver<ICloseEvent> for IMRU tasks","user":{"login":"jwang98052","id":5666504,"avatar_url":"https://avatars.githubusercontent.com/u/5666504?v=3","gravatar_id":"","url":"https://api.github.com/users/jwang98052","html_url":"https://github.com/jwang98052","followers_url":"https://api.github.com/users/jwang98052/followers","following_url":"https://api.github.com/users/jwang98052/following{/other_user}","gists_url":"https://api.github.com/users/jwang98052/gists{/gist_id}","starred_url":"https://api.github.com/users/jwang98052/starred{/owner}{/repo}","subscriptions_url":"https://api.github.com/users/jwang98052/subscriptions","organizations_url":"https://api.github.com/users/jwang98052/orgs","repos_url":"https://api.github.com/users/jwang98052/repos","events_url":"https://api.github.com/users/jwang98052/events{/privacy}","received_events_url":"https://api.github.com/users/jwang98052/received_events","type":"User","site_admin":false},"body":"* IMRU tasks implement IObserver<ICloseEvent>\r\n* Task will return after it receives the close event and completes the current iteration\r\n* Update Task Manager for Completed scenario to as the task might be in WaitingForClose state instead of Running state when receiving ICompletdTask event.\r\n* Update TaskStateMachine to allow transit from TaskWaitingForClose with CompletedTask to TaskClosedByDriver state\r\n* Adding test cases\r\n\r\nJIRA: [REEF-1321](https://issues.apache.org/jira/browse/REEF-1321)\r\nThis 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