{"action":"created","comment":{"url":"https://api.github.com/repos/caskdata/cdap/pulls/comments/33983097","id":33983097,"diff_hunk":"@@ -0,0 +1,38 @@\n+/*\n+ * Copyright © 2015 Cask Data, Inc.\n+ *\n+ * Licensed under the Apache License, Version 2.0 (the \"License\"); you may not\n+ * use this file except in compliance with the License. You may obtain a copy of\n+ * 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, WITHOUT\n+ * WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the\n+ * License for the specific language governing permissions and limitations under\n+ * the License.\n+ */\n+\n+package co.cask.cdap.internal.app.runtime.spark;\n+\n+import org.apache.hadoop.conf.Configuration;\n+import org.apache.hadoop.mapreduce.InputFormat;\n+\n+import java.util.Map;\n+\n+/**\n+ * Interface to provide abstraction for accessing either scala or java version of the Apache SparkContext.\n+ */\n+public interface ApacheSparkContext {","path":"cdap-app-fabric/src/main/java/co/cask/cdap/internal/app/runtime/spark/ApacheSparkContext.java","position":27,"original_position":27,"commit_id":"55384c8bc4706964a943daa38f3166006f99c51c","original_commit_id":"55384c8bc4706964a943daa38f3166006f99c51c","user":{"login":"chtyim","id":885032,"avatar_url":"https://avatars.githubusercontent.com/u/885032?v=3","gravatar_id":"","url":"https://api.github.com/users/chtyim","html_url":"https://github.com/chtyim","followers_url":"https://api.github.com/users/chtyim/followers","following_url":"https://api.github.com/users/chtyim/following{/other_user}","gists_url":"https://api.github.com/users/chtyim/gists{/gist_id}","starred_url":"https://api.github.com/users/chtyim/starred{/owner}{/repo}","subscriptions_url":"https://api.github.com/users/chtyim/subscriptions","organizations_url":"https://api.github.com/users/chtyim/orgs","repos_url":"https://api.github.com/users/chtyim/repos","events_url":"https://api.github.com/users/chtyim/events{/privacy}","received_events_url":"https://api.github.com/users/chtyim/received_events","type":"User","site_admin":false},"body":"That's true. Missed that.","created_at":"2015-07-06T21:13:46Z","updated_at":"2015-07-06T21:13:46Z","html_url":"https://github.com/caskdata/cdap/pull/3094#discussion_r33983097","pull_request_url":"https://api.github.com/repos/caskdata/cdap/pulls/3094","_links":{"self":{"href":"https://api.github.com/repos/caskdata/cdap/pulls/comments/33983097"},"html":{"href":"https://github.com/caskdata/cdap/pull/3094#discussion_r33983097"},"pull_request":{"href":"https://api.github.com/repos/caskdata/cdap/pulls/3094"}}},"pull_request":{"url":"https://api.github.com/repos/caskdata/cdap/pulls/3094","id":39308925,"html_url":"https://github.com/caskdata/cdap/pull/3094","diff_url":"https://github.com/caskdata/cdap/pull/3094.diff","patch_url":"https://github.com/caskdata/cdap/pull/3094.patch","issue_url":"https://api.github.com/repos/caskdata/cdap/issues/3094","number":3094,"state":"open","locked":false,"title":"(CDAP-344) Runs spark in all modes (in-memory, standalone, distributed)","user":{"login":"chtyim","id":885032,"avatar_url":"https://avatars.githubusercontent.com/u/885032?v=3","gravatar_id":"","url":"https://api.github.com/users/chtyim","html_url":"https://github.com/chtyim","followers_url":"https://api.github.com/users/chtyim/followers","following_url":"https://api.github.com/users/chtyim/following{/other_user}","gists_url":"https://api.github.com/users/chtyim/gists{/gist_id}","starred_url":"https://api.github.com/users/chtyim/starred{/owner}{/repo}","subscriptions_url":"https://api.github.com/users/chtyim/subscriptions","organizations_url":"https://api.github.com/users/chtyim/orgs","repos_url":"https://api.github.com/users/chtyim/repos","events_url":"https://api.github.com/users/chtyim/events{/privacy}","received_events_url":"https://api.github.com/users/chtyim/received_events","type":"User","site_admin":false},"body":"High level idea:\r\n\r\n- Replace the ExecutorURLClassLoader (Spark 1.2) / MutableURLClassLoader (Spark 1.3+) in Spark with our own implementation\r\n  - Do class loading in CDAP way, which support program classloader and system classloader correctly\r\n  - Stores the SparkContext object inside the classloader\r\n  - Reconstruct the SparkContext object in remote node when the classloader is being created (or when Spark metrics sink is created, depending on which happens first).\r\n  - Since we always have the proper SparkContext object to work with (with all CDAP services, like metrics, logging, tx...), we don't need to do anything for serializing/deserializing system services objects\r\n\r\n- Enabled access to dataset through `SparkContext`\r\n  - `SparkContext` now extends from `DatasetContext`\r\n  - User can access `Dataset` in `beforeSubmit`, `onFinish` as well as in `run`.\r\n  - Access of `Dataset` inside closure is not yet supported, since `Dataset` are not serializable, nor the `SparkContext`.\r\n\r\n- Properly integrated with Spark metrics system. All metrics emitted by Spark framework are also collected.\r\n\r\n- Integration with Workflow and WorkflowToken is not done. Need to have another PR for that.","created_at":"2015-07-06T20:46:43Z","updated_at":"2015-07-06T21:13:47Z","closed_at":null,"merged_at":null,"merge_commit_sha":"4855b74c25cb65f04233fead2b187694ecce4938","assignee":null,"milestone":null,"commits_url":"https://api.github.com/repos/caskdata/cdap/pulls/3094/commits","review_comments_url":"https://api.github.com/repos/caskdata/cdap/pulls/3094/comments","review_comment_url":"https://api.github.com/repos/caskdata/cdap/pulls/comments{/number}","comments_url":"https://api.github.com/repos/caskdata/cdap/issues/3094/comments","statuses_url":"https://api.github.com/repos/caskdata/cdap/statuses/55384c8bc4706964a943daa38f3166006f99c51c","head":{"label":"caskdata:feature/spark-refactor","ref":"feature/spark-refactor","sha":"55384c8bc4706964a943daa38f3166006f99c51c","user":{"login":"caskdata","id":8123023,"avatar_url":"https://avatars.githubusercontent.com/u/8123023?v=3","gravatar_id":"","url":"https://api.github.com/users/caskdata","html_url":"https://github.com/caskdata","followers_url":"https://api.github.com/users/caskdata/followers","following_url":"https://api.github.com/users/caskdata/following{/other_user}","gists_url":"https://api.github.com/users/caskdata/gists{/gist_id}","starred_url":"https://api.github.com/users/caskdata/starred{/owner}{/repo}","subscriptions_url":"https://api.github.com/users/caskdata/subscriptions","organizations_url":"https://api.github.com/users/caskdata/orgs","repos_url":"https://api.github.com/users/caskdata/repos","events_url":"https://api.github.com/users/caskdata/events{/privacy}","received_events_url":"https://api.github.com/users/caskdata/received_events","type":"Organization","site_admin":false},"repo":{"id":22542759,"name":"cdap","full_name":"caskdata/cdap","owner":{"login":"caskdata","id":8123023,"avatar_url":"https://avatars.githubusercontent.com/u/8123023?v=3","gravatar_id":"","url":"https://api.github.com/users/caskdata","html_url":"https://github.com/caskdata","followers_url":"https://api.github.com/users/caskdata/followers","following_url":"https://api.github.com/users/caskdata/following{/other_user}","gists_url":"https://api.github.com/users/caskdata/gists{/gist_id}","starred_url":"https://api.github.com/users/caskdata/starred{/owner}{/repo}","subscriptions_url":"https://api.github.com/users/caskdata/subscriptions","organizations_url":"https://api.github.com/users/caskdata/orgs","repos_url":"https://api.github.com/users/caskdata/repos","events_url":"https://api.github.com/users/caskdata/events{/privacy}","received_events_url":"https://api.github.com/users/caskdata/received_events","type":"Organization","site_admin":false},"private":false,"html_url":"https://github.com/caskdata/cdap","description":"Cask 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