{"action":"created","comment":{"url":"https://api.github.com/repos/apache/spark/pulls/comments/29552729","id":29552729,"diff_hunk":"@@ -0,0 +1,103 @@\n+/*\n+ * Licensed to the Apache Software Foundation (ASF) under one or more\n+ * contributor license agreements.  See the NOTICE file distributed with\n+ * this work for additional information regarding copyright ownership.\n+ * The ASF licenses this file to You under the Apache License, Version 2.0\n+ * (the \"License\"); you may not use this file except in compliance with\n+ * the License.  You may obtain a copy of the License at\n+ *\n+ *    http://www.apache.org/licenses/LICENSE-2.0\n+ *\n+ * Unless required by applicable law or agreed to in writing, software\n+ * distributed under the License is distributed on an \"AS IS\" BASIS,\n+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.\n+ * See the License for the specific language governing permissions and\n+ * limitations under the License.\n+ */\n+\n+package org.apache.spark.rdd\n+\n+import java.util.concurrent.atomic.AtomicInteger\n+import org.apache.spark.SparkContext\n+\n+/**\n+ * A collection of utility methods to construct a hierarchical representation of RDD scopes.\n+ * An RDD scope tracks the series of operations that created a given RDD.\n+ */\n+private[spark] object RDDScope {\n+\n+  // Symbol for delimiting each level of the hierarchy\n+  // e.g. grandparent;parent;child\n+  val SCOPE_NESTING_DELIMITER = \";\"","path":"core/src/main/scala/org/apache/spark/rdd/RDDScope.scala","position":31,"original_position":31,"commit_id":"b80cc52d81e6963d78b670299b40c8fc033f40e2","original_commit_id":"b80cc52d81e6963d78b670299b40c8fc033f40e2","user":{"login":"pwendell","id":320616,"avatar_url":"https://avatars.githubusercontent.com/u/320616?v=3","gravatar_id":"","url":"https://api.github.com/users/pwendell","html_url":"https://github.com/pwendell","followers_url":"https://api.github.com/users/pwendell/followers","following_url":"https://api.github.com/users/pwendell/following{/other_user}","gists_url":"https://api.github.com/users/pwendell/gists{/gist_id}","starred_url":"https://api.github.com/users/pwendell/starred{/owner}{/repo}","subscriptions_url":"https://api.github.com/users/pwendell/subscriptions","organizations_url":"https://api.github.com/users/pwendell/orgs","repos_url":"https://api.github.com/users/pwendell/repos","events_url":"https://api.github.com/users/pwendell/events{/privacy}","received_events_url":"https://api.github.com/users/pwendell/received_events","type":"User","site_admin":false},"body":"It seems a bit awkward to be defining our own string serialization format for scopes. This is actually a public API (right?) because we will be writing this out to the event logs and reading it back. What if instead you just had:\r\n\r\n1. A programmatic representation of a scope.\r\n2. A JSON serializer for that representation.\r\n\r\nThe JSON output would likely be a list of enclosing scopes.","created_at":"2015-05-03T03:54:57Z","updated_at":"2015-05-03T03:54:57Z","html_url":"https://github.com/apache/spark/pull/5729#discussion_r29552729","pull_request_url":"https://api.github.com/repos/apache/spark/pulls/5729","_links":{"self":{"href":"https://api.github.com/repos/apache/spark/pulls/comments/29552729"},"html":{"href":"https://github.com/apache/spark/pull/5729#discussion_r29552729"},"pull_request":{"href":"https://api.github.com/repos/apache/spark/pulls/5729"}}},"pull_request":{"url":"https://api.github.com/repos/apache/spark/pulls/5729","id":34222177,"html_url":"https://github.com/apache/spark/pull/5729","diff_url":"https://github.com/apache/spark/pull/5729.diff","patch_url":"https://github.com/apache/spark/pull/5729.patch","issue_url":"https://api.github.com/repos/apache/spark/issues/5729","number":5729,"state":"open","locked":false,"title":"[SPARK-6943][WIP] DAG visualization on SparkUI","user":{"login":"andrewor14","id":2133137,"avatar_url":"https://avatars.githubusercontent.com/u/2133137?v=3","gravatar_id":"","url":"https://api.github.com/users/andrewor14","html_url":"https://github.com/andrewor14","followers_url":"https://api.github.com/users/andrewor14/followers","following_url":"https://api.github.com/users/andrewor14/following{/other_user}","gists_url":"https://api.github.com/users/andrewor14/gists{/gist_id}","starred_url":"https://api.github.com/users/andrewor14/starred{/owner}{/repo}","subscriptions_url":"https://api.github.com/users/andrewor14/subscriptions","organizations_url":"https://api.github.com/users/andrewor14/orgs","repos_url":"https://api.github.com/users/andrewor14/repos","events_url":"https://api.github.com/users/andrewor14/events{/privacy}","received_events_url":"https://api.github.com/users/andrewor14/received_events","type":"User","site_admin":false},"body":"Screenshot is out of date. I will post an updated version shortly.\r\n-----------------------------------------------------------------------------------------------------------------------------------------\r\nThis patch adds the functionality to display the per-stage RDD DAG on the SparkUI. On a high level, the information displayed include:\r\n- The names and IDs of all RDDs involved in a stage\r\n- How these RDDs depend on each other, and\r\n- What scopes these RDDs are defined in\r\nScope here refers to the user-facing operation that created the RDDs (e.g. `textFile`, `treeAggregate`).\r\n\r\nThis blatantly stole a few lines of HTML and JavaScript from #5547 (thanks @shroffpradyumn!). We will have to deal with the merge conflicts a little later.\r\n\r\nFor instance, here's what the first stage of word count looks like:\r\n```\r\nsc.textFile(\"README.md\")\r\n  .flatMap { _.split(\" \") }\r\n  .map { (_, 1) }\r\n  .reduceByKey { _ + _ }\r\n  .sortBy(-_._2)\r\n```\r\n![](https://issues.apache.org/jira/secure/attachment/12728661/with-closures.png)","created_at":"2015-04-27T23:55:47Z","updated_at":"2015-05-03T03:54:57Z","closed_at":null,"merged_at":null,"merge_commit_sha":"57af6c83402c7a8f2890e8e95fa8083db43a3d7e","assignee":null,"milestone":null,"commits_url":"https://api.github.com/repos/apache/spark/pulls/5729/commits","review_comments_url":"https://api.github.com/repos/apache/spark/pulls/5729/comments","review_comment_url":"https://api.github.com/repos/apache/spark/pulls/comments{/number}","comments_url":"https://api.github.com/repos/apache/spark/issues/5729/comments","statuses_url":"https://api.github.com/repos/apache/spark/statuses/b80cc52d81e6963d78b670299b40c8fc033f40e2","head":{"label":"andrewor14:viz2","ref":"viz2","sha":"b80cc52d81e6963d78b670299b40c8fc033f40e2","user":{"login":"andrewor14","id":2133137,"avatar_url":"https://avatars.githubusercontent.com/u/2133137?v=3","gravatar_id":"","url":"https://api.github.com/users/andrewor14","html_url":"https://github.com/andrewor14","followers_url":"https://api.github.com/users/andrewor14/followers","following_url":"https://api.github.com/users/andrewor14/following{/other_user}","gists_url":"https://api.github.com/users/andrewor14/gists{/gist_id}","starred_url":"https://api.github.com/users/andrewor14/starred{/owner}{/repo}","subscriptions_url":"https://api.github.com/users/andrewor14/subscriptions","organizations_url":"https://api.github.com/users/andrewor14/orgs","repos_url":"https://api.github.com/users/andrewor14/repos","events_url":"https://api.github.com/users/andrewor14/events{/privacy}","received_events_url":"https://api.github.com/users/andrewor14/received_events","type":"User","site_admin":false},"repo":{"id":17231517,"name":"spark","full_name":"andrewor14/spark","owner":{"login":"andrewor14","id":2133137,"avatar_url":"https://avatars.githubusercontent.com/u/2133137?v=3","gravatar_id":"","url":"https://api.github.com/users/andrewor14","html_url":"https://github.com/andrewor14","followers_url":"https://api.github.com/users/andrewor14/followers","following_url":"https://api.github.com/users/andrewor14/following{/other_user}","gists_url":"https://api.github.com/users/andrewor14/gists{/gist_id}","starred_url":"https://api.github.com/users/andrewor14/starred{/owner}{/repo}","subscriptions_url":"https://api.github.com/users/andrewor14/subscriptions","organizations_url":"https://api.github.com/users/andrewor14/orgs","repos_url":"https://api.github.com/users/andrewor14/repos","events_url":"https://api.github.com/users/andrewor14/events{/privacy}","received_events_url":"https://api.github.com/users/andrewor14/received_events","type":"User","site_admin":false},"private":false,"html_url":"https://github.com/andrewor14/spark","description":"Mirror 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