{"action":"created","comment":{"url":"https://api.github.com/repos/caskdata/cdap/pulls/comments/56753021","id":56753021,"diff_hunk":"@@ -0,0 +1,53 @@\n+/*\n+ * Copyright © 2016 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.etl.api.batch;\n+\n+import co.cask.cdap.api.annotation.Beta;\n+\n+/**\n+ * Context of a Batch Aggregator.\n+ */\n+@Beta\n+public interface BatchAggregatorContext extends BatchContext {\n+\n+  /**\n+   * Set the number of partitions to use to group values. If none is set, the execution engine will decide\n+   * how many partitions to use.\n+   *\n+   * @param numPartitions the number of partitions to use when grouping.\n+   */\n+  void setNumPartitions(int numPartitions);\n+\n+  /**\n+   * Set the group key class. This is not required if the aggregator is parameterized with a concrete class\n+   * for the group key. This method is only required if the group key class is only known at configure time\n+   * versus compile time.\n+   *\n+   * @param groupKeyClass the group key class\n+   */\n+  void setGroupKeyClass(Class<?> groupKeyClass);","path":"cdap-app-templates/cdap-etl/cdap-etl-api/src/main/java/co/cask/cdap/etl/api/batch/BatchAggregatorContext.java","position":42,"original_position":42,"commit_id":"9e19ffe2dc90ee45641aae6f0b3d444aa073da33","original_commit_id":"9e19ffe2dc90ee45641aae6f0b3d444aa073da33","user":{"login":"bdmogal","id":3895099,"avatar_url":"https://avatars.githubusercontent.com/u/3895099?v=3","gravatar_id":"","url":"https://api.github.com/users/bdmogal","html_url":"https://github.com/bdmogal","followers_url":"https://api.github.com/users/bdmogal/followers","following_url":"https://api.github.com/users/bdmogal/following{/other_user}","gists_url":"https://api.github.com/users/bdmogal/gists{/gist_id}","starred_url":"https://api.github.com/users/bdmogal/starred{/owner}{/repo}","subscriptions_url":"https://api.github.com/users/bdmogal/subscriptions","organizations_url":"https://api.github.com/users/bdmogal/orgs","repos_url":"https://api.github.com/users/bdmogal/repos","events_url":"https://api.github.com/users/bdmogal/events{/privacy}","received_events_url":"https://api.github.com/users/bdmogal/received_events","type":"User","site_admin":false},"body":"Oh I see now, it has to extend ``WritableComparable``, unless its a ``StructuredRecord``, right? Is there any way to enforce that?","created_at":"2016-03-19T18:36:21Z","updated_at":"2016-03-19T18:36:21Z","html_url":"https://github.com/caskdata/cdap/pull/5331#discussion_r56753021","pull_request_url":"https://api.github.com/repos/caskdata/cdap/pulls/5331","_links":{"self":{"href":"https://api.github.com/repos/caskdata/cdap/pulls/comments/56753021"},"html":{"href":"https://github.com/caskdata/cdap/pull/5331#discussion_r56753021"},"pull_request":{"href":"https://api.github.com/repos/caskdata/cdap/pulls/5331"}}},"pull_request":{"url":"https://api.github.com/repos/caskdata/cdap/pulls/5331","id":63474564,"html_url":"https://github.com/caskdata/cdap/pull/5331","diff_url":"https://github.com/caskdata/cdap/pull/5331.diff","patch_url":"https://github.com/caskdata/cdap/pull/5331.patch","issue_url":"https://api.github.com/repos/caskdata/cdap/issues/5331","number":5331,"state":"open","locked":false,"title":"CDAP-5146 add aggregator apis","user":{"login":"albertshau","id":5215004,"avatar_url":"https://avatars.githubusercontent.com/u/5215004?v=3","gravatar_id":"","url":"https://api.github.com/users/albertshau","html_url":"https://github.com/albertshau","followers_url":"https://api.github.com/users/albertshau/followers","following_url":"https://api.github.com/users/albertshau/following{/other_user}","gists_url":"https://api.github.com/users/albertshau/gists{/gist_id}","starred_url":"https://api.github.com/users/albertshau/starred{/owner}{/repo}","subscriptions_url":"https://api.github.com/users/albertshau/subscriptions","organizations_url":"https://api.github.com/users/albertshau/orgs","repos_url":"https://api.github.com/users/albertshau/repos","events_url":"https://api.github.com/users/albertshau/events{/privacy}","received_events_url":"https://api.github.com/users/albertshau/received_events","type":"User","site_admin":false},"body":"Adding the aggregator apis for the new plugin type.\r\nAll aggregator apis are marked as beta and are subject to 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