{"action":"created","comment":{"url":"https://api.github.com/repos/caskdata/cdap/pulls/comments/39353843","id":39353843,"diff_hunk":"@@ -0,0 +1,63 @@\n+/*\n+ * Copyright © 2014-2015 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.api.dataset.lib;\n+\n+import co.cask.cdap.api.mapreduce.MapReduceTaskContext;\n+\n+/**\n+ * Responsible for dynamically determining a @{link PartitionKey}.\n+ * For each K, V pair, the getPartitionKey(K, V) method is called to determine a PartitionKey.\n+ *\n+ * @param <K> Type of key\n+ * @param <V> Type of value\n+ */\n+public abstract class DynamicPartitioner<K, V> {\n+\n+\n+  /**\n+   *  Initializes a DynamicPartitioner.\n+   *  <p>\n+   *    This method will be called only once per {@link DynamicPartitioner} instance. It is the first method call\n+   *    on that instance.\n+   *  </p>\n+   *  @param mapReduceTaskContext the mapReduceTaskContext for the task that this DynamicPartitioner is running in.\n+   *  Note that the hadoop context is not available on this MapReduceTaskContext.\n+   */\n+  public void initialize(MapReduceTaskContext<K, V> mapReduceTaskContext) {\n+    // do nothing by default\n+  }\n+\n+  /**\n+   *  Destroys a DynamicPartitioner.\n+   *  <p>\n+   *    This method will be called only once per {@link DynamicPartitioner} instance. It is the last method call\n+   *    on that instance.\n+   *  </p>\n+   */\n+  public void destroy() {","path":"cdap-api/src/main/java/co/cask/cdap/api/dataset/lib/DynamicPartitioner.java","position":51,"original_position":51,"commit_id":"73cbf37066593b4535b5cc5fc79b737cb35ae582","original_commit_id":"9a5fb8b8ce49c073387970f6ef7f758c345ececb","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":"Added my comment in the issue.","created_at":"2015-09-13T23:26:15Z","updated_at":"2015-09-13T23:26:15Z","html_url":"https://github.com/caskdata/cdap/pull/3848#discussion_r39353843","pull_request_url":"https://api.github.com/repos/caskdata/cdap/pulls/3848","_links":{"self":{"href":"https://api.github.com/repos/caskdata/cdap/pulls/comments/39353843"},"html":{"href":"https://github.com/caskdata/cdap/pull/3848#discussion_r39353843"},"pull_request":{"href":"https://api.github.com/repos/caskdata/cdap/pulls/3848"}}},"pull_request":{"url":"https://api.github.com/repos/caskdata/cdap/pulls/3848","id":44485967,"html_url":"https://github.com/caskdata/cdap/pull/3848","diff_url":"https://github.com/caskdata/cdap/pull/3848.diff","patch_url":"https://github.com/caskdata/cdap/pull/3848.patch","issue_url":"https://api.github.com/repos/caskdata/cdap/issues/3848","number":3848,"state":"open","locked":false,"title":"Feature/cdap 2757 dynamic partitioning of mr output","user":{"login":"anwar6953","id":2440977,"avatar_url":"https://avatars.githubusercontent.com/u/2440977?v=3","gravatar_id":"","url":"https://api.github.com/users/anwar6953","html_url":"https://github.com/anwar6953","followers_url":"https://api.github.com/users/anwar6953/followers","following_url":"https://api.github.com/users/anwar6953/following{/other_user}","gists_url":"https://api.github.com/users/anwar6953/gists{/gist_id}","starred_url":"https://api.github.com/users/anwar6953/starred{/owner}{/repo}","subscriptions_url":"https://api.github.com/users/anwar6953/subscriptions","organizations_url":"https://api.github.com/users/anwar6953/orgs","repos_url":"https://api.github.com/users/anwar6953/repos","events_url":"https://api.github.com/users/anwar6953/events{/privacy}","received_events_url":"https://api.github.com/users/anwar6953/received_events","type":"User","site_admin":false},"body":"Ability to dynamically write to multiple partitions of a PartitionedFileSet dataset, as the output of a MapReduce job.\r\n\r\nThis is implemented by having a DynamicParitioningOutputFormat which writes records to a relative path in the temporary directory of the MapReduce job, based upon the PartitionKey returned by a DynamicPartitioner class, which is implemented by the user. Then, in the commitJob of the OutputFormatCommitter, these paths are moved to the PartitionedFileSet's baseLocation, and Partitions are registered in the dataset for each of these.\r\n\r\nhttps://issues.cask.co/browse/CDAP-2757\r\nhttp://builds.cask.co/browse/CDAP-DUT2731-11","created_at":"2015-09-08T21:34:27Z","updated_at":"2015-09-13T23:26:15Z","closed_at":null,"merged_at":null,"merge_commit_sha":"5e83f9c9607445a3544b2cddc45abac96c7df578","assignee":null,"milestone":null,"commits_url":"https://api.github.com/repos/caskdata/cdap/pulls/3848/commits","review_comments_url":"https://api.github.com/repos/caskdata/cdap/pulls/3848/comments","review_comment_url":"https://api.github.com/repos/caskdata/cdap/pulls/comments{/number}","comments_url":"https://api.github.com/repos/caskdata/cdap/issues/3848/comments","statuses_url":"https://api.github.com/repos/caskdata/cdap/statuses/73cbf37066593b4535b5cc5fc79b737cb35ae582","head":{"label":"caskdata:feature/CDAP-2757-dynamic-partitioning-of-mr-output","ref":"feature/CDAP-2757-dynamic-partitioning-of-mr-output","sha":"73cbf37066593b4535b5cc5fc79b737cb35ae582","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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