{"action":"created","comment":{"url":"https://api.github.com/repos/apache/spark/pulls/comments/31629703","id":31629703,"diff_hunk":"@@ -253,10 +269,26 @@ private[yarn] class YarnAllocator(\n    * added in recent versions.\n    */\n   private def createContainerRequest(resource: Resource): ContainerRequest = {\n+    // filter nodes which don't have containers but node preference is required.\n+    val nodes = {\n+      val unusedNodes = preferredNodeLocationToUses.filterKeys(_ == false).keys\n+      if (unusedNodes.isEmpty) {\n+        null\n+      } else {\n+        unusedNodes.toArray\n+      }\n+    }\n+\n+    val racks = if (preferredRackLocations.isEmpty) {\n+      null\n+    } else {\n+      preferredRackLocations.toArray\n+    }\n+\n     nodeLabelConstructor.map { constructor =>\n-      constructor.newInstance(resource, null, null, RM_REQUEST_PRIORITY, true: java.lang.Boolean,\n+      constructor.newInstance(resource, nodes, racks, RM_REQUEST_PRIORITY, true: java.lang.Boolean,","path":"yarn/src/main/scala/org/apache/spark/deploy/yarn/YarnAllocator.scala","position":52,"original_position":52,"commit_id":"873ee9b8909c58a903113f4d07a0e5e4e55006ef","original_commit_id":"873ee9b8909c58a903113f4d07a0e5e4e55006ef","user":{"login":"steveloughran","id":162090,"avatar_url":"https://avatars.githubusercontent.com/u/162090?v=3","gravatar_id":"","url":"https://api.github.com/users/steveloughran","html_url":"https://github.com/steveloughran","followers_url":"https://api.github.com/users/steveloughran/followers","following_url":"https://api.github.com/users/steveloughran/following{/other_user}","gists_url":"https://api.github.com/users/steveloughran/gists{/gist_id}","starred_url":"https://api.github.com/users/steveloughran/starred{/owner}{/repo}","subscriptions_url":"https://api.github.com/users/steveloughran/subscriptions","organizations_url":"https://api.github.com/users/steveloughran/orgs","repos_url":"https://api.github.com/users/steveloughran/repos","events_url":"https://api.github.com/users/steveloughran/events{/privacy}","received_events_url":"https://api.github.com/users/steveloughran/received_events","type":"User","site_admin":false},"body":"why? Don't know. \r\n\r\nWhere? [AMRMClient.ContainerRequest constructor](https://github.com/apache/hadoop/blob/trunk/hadoop-yarn-project/hadoop-yarn/hadoop-yarn-client/src/main/java/org/apache/hadoop/yarn/client/api/AMRMClient.java#L184)","created_at":"2015-06-03T14:42:58Z","updated_at":"2015-06-03T14:42:58Z","html_url":"https://github.com/apache/spark/pull/6394#discussion_r31629703","pull_request_url":"https://api.github.com/repos/apache/spark/pulls/6394","_links":{"self":{"href":"https://api.github.com/repos/apache/spark/pulls/comments/31629703"},"html":{"href":"https://github.com/apache/spark/pull/6394#discussion_r31629703"},"pull_request":{"href":"https://api.github.com/repos/apache/spark/pulls/6394"}}},"pull_request":{"url":"https://api.github.com/repos/apache/spark/pulls/6394","id":36124673,"html_url":"https://github.com/apache/spark/pull/6394","diff_url":"https://github.com/apache/spark/pull/6394.diff","patch_url":"https://github.com/apache/spark/pull/6394.patch","issue_url":"https://api.github.com/repos/apache/spark/issues/6394","number":6394,"state":"open","locked":false,"title":"[SPARK-4352][YARN][WIP] Incorporate locality preferences in dynamic allocation requests","user":{"login":"jerryshao","id":850797,"avatar_url":"https://avatars.githubusercontent.com/u/850797?v=3","gravatar_id":"","url":"https://api.github.com/users/jerryshao","html_url":"https://github.com/jerryshao","followers_url":"https://api.github.com/users/jerryshao/followers","following_url":"https://api.github.com/users/jerryshao/following{/other_user}","gists_url":"https://api.github.com/users/jerryshao/gists{/gist_id}","starred_url":"https://api.github.com/users/jerryshao/starred{/owner}{/repo}","subscriptions_url":"https://api.github.com/users/jerryshao/subscriptions","organizations_url":"https://api.github.com/users/jerryshao/orgs","repos_url":"https://api.github.com/users/jerryshao/repos","events_url":"https://api.github.com/users/jerryshao/events{/privacy}","received_events_url":"https://api.github.com/users/jerryshao/received_events","type":"User","site_admin":false},"body":"Currently there's no locality preference for container request in YARN mode, this will affect the performance if fetching data remotely, so here proposed to add locality in Yarn dynamic allocation mode. \r\n\r\nPing @sryza, please help to review, thanks a lot.","created_at":"2015-05-25T08:25:14Z","updated_at":"2015-06-03T14:42:58Z","closed_at":null,"merged_at":null,"merge_commit_sha":"ab4384b2d32ba2466fc3a8b7665a56f5a81be2f8","assignee":null,"milestone":null,"commits_url":"https://api.github.com/repos/apache/spark/pulls/6394/commits","review_comments_url":"https://api.github.com/repos/apache/spark/pulls/6394/comments","review_comment_url":"https://api.github.com/repos/apache/spark/pulls/comments{/number}","comments_url":"https://api.github.com/repos/apache/spark/issues/6394/comments","statuses_url":"https://api.github.com/repos/apache/spark/statuses/873ee9b8909c58a903113f4d07a0e5e4e55006ef","head":{"label":"jerryshao:SPARK-4352","ref":"SPARK-4352","sha":"873ee9b8909c58a903113f4d07a0e5e4e55006ef","user":{"login":"jerryshao","id":850797,"avatar_url":"https://avatars.githubusercontent.com/u/850797?v=3","gravatar_id":"","url":"https://api.github.com/users/jerryshao","html_url":"https://github.com/jerryshao","followers_url":"https://api.github.com/users/jerryshao/followers","following_url":"https://api.github.com/users/jerryshao/following{/other_user}","gists_url":"https://api.github.com/users/jerryshao/gists{/gist_id}","starred_url":"https://api.github.com/users/jerryshao/starred{/owner}{/repo}","subscriptions_url":"https://api.github.com/users/jerryshao/subscriptions","organizations_url":"https://api.github.com/users/jerryshao/orgs","repos_url":"https://api.github.com/users/jerryshao/repos","events_url":"https://api.github.com/users/jerryshao/events{/privacy}","received_events_url":"https://api.github.com/users/jerryshao/received_events","type":"User","site_admin":false},"repo":{"id":18259371,"name":"apache-spark","full_name":"jerryshao/apache-spark","owner":{"login":"jerryshao","id":850797,"avatar_url":"https://avatars.githubusercontent.com/u/850797?v=3","gravatar_id":"","url":"https://api.github.com/users/jerryshao","html_url":"https://github.com/jerryshao","followers_url":"https://api.github.com/users/jerryshao/followers","following_url":"https://api.github.com/users/jerryshao/following{/other_user}","gists_url":"https://api.github.com/users/jerryshao/gists{/gist_id}","starred_url":"https://api.github.com/users/jerryshao/starred{/owner}{/repo}","subscriptions_url":"https://api.github.com/users/jerryshao/subscriptions","organizations_url":"https://api.github.com/users/jerryshao/orgs","repos_url":"https://api.github.com/users/jerryshao/repos","events_url":"https://api.github.com/users/jerryshao/events{/privacy}","received_events_url":"https://api.github.com/users/jerryshao/received_events","type":"User","site_admin":false},"private":false,"html_url":"https://github.com/jerryshao/apache-spark","description":"Mirror 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