{"action":"created","comment":{"url":"https://api.github.com/repos/caskdata/cdap/pulls/comments/27515218","id":27515218,"diff_hunk":"@@ -0,0 +1,206 @@\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.templates.etl.batch;\n+\n+import co.cask.cdap.api.ProgramLifecycle;\n+import co.cask.cdap.api.mapreduce.AbstractMapReduce;\n+import co.cask.cdap.api.mapreduce.MapReduceContext;\n+import co.cask.cdap.templates.etl.api.Transform;\n+import co.cask.cdap.templates.etl.api.batch.BatchSink;\n+import co.cask.cdap.templates.etl.api.batch.BatchSinkContext;\n+import co.cask.cdap.templates.etl.api.batch.BatchSource;\n+import co.cask.cdap.templates.etl.api.batch.BatchSourceContext;\n+import co.cask.cdap.templates.etl.common.Constants;\n+import co.cask.cdap.templates.etl.common.DefaultEmitter;\n+import co.cask.cdap.templates.etl.common.DefaultStageConfigurer;\n+import co.cask.cdap.templates.etl.common.DefaultTransformContext;\n+import com.google.common.base.Preconditions;\n+import com.google.common.base.Throwables;\n+import com.google.common.collect.Lists;\n+import com.google.common.reflect.TypeToken;\n+import com.google.gson.Gson;\n+import com.google.gson.JsonArray;\n+import com.google.gson.JsonObject;\n+import com.google.gson.JsonParser;\n+import org.apache.hadoop.mapreduce.Job;\n+import org.apache.hadoop.mapreduce.Mapper;\n+import org.slf4j.Logger;\n+import org.slf4j.LoggerFactory;\n+\n+import java.io.IOException;\n+import java.lang.reflect.Type;\n+import java.util.List;\n+import java.util.Map;\n+\n+/**\n+ * MapReduce driver for Batch ETL Adapters.\n+ */\n+public class BatchDriver extends AbstractMapReduce {\n+  private static final Logger LOG = LoggerFactory.getLogger(BatchDriver.class);\n+  private static final Gson GSON = new Gson();\n+  private static final JsonParser JSON_PARSER = new JsonParser();\n+\n+  private BatchSource source;\n+  private BatchSink sink;\n+\n+  @Override\n+  public void configure() {\n+    setName(\"BatchDriver\");\n+    setDescription(\"MapReduce driver for Batch ETL Adapters\");\n+  }\n+\n+  @Override\n+  public void beforeSubmit(MapReduceContext context) throws Exception {\n+    Job job = context.getHadoopJob();\n+\n+    Preconditions.checkArgument(context.getRuntimeArguments().containsKey(Constants.Source.CLASS_NAME));\n+    Preconditions.checkArgument(context.getRuntimeArguments().containsKey(Constants.Sink.CLASS_NAME));\n+    Preconditions.checkArgument(context.getRuntimeArguments().containsKey(Constants.Transform.TRANSFORM_CLASS_LIST));\n+\n+    String sourceClass = context.getRuntimeArguments().get(Constants.Source.CLASS_NAME);\n+    String sinkClass = context.getRuntimeArguments().get(Constants.Sink.CLASS_NAME);\n+\n+    source = (BatchSource) Class.forName(sourceClass).newInstance();\n+    sink = (BatchSink) Class.forName(sinkClass).newInstance();\n+\n+    prepareSourceJob(context);\n+    prepareSinkJob(context);\n+    prepareTransform(context);\n+\n+    job.setMapperClass(MapperDriver.class);\n+    job.setNumReduceTasks(0);\n+  }\n+\n+  private void prepareSourceJob(MapReduceContext context) {\n+    DefaultStageConfigurer sourceConfigurer = new DefaultStageConfigurer(source.getClass());\n+    source.configure(sourceConfigurer);","path":"cdap-app-templates/cdap-etl/cdap-etl-core/src/main/java/co/cask/cdap/templates/etl/batch/BatchDriver.java","position":90,"original_position":90,"commit_id":"b9c0d9c8d03591ac50a0cbfddebe69b74f80ea2f","original_commit_id":"b9c0d9c8d03591ac50a0cbfddebe69b74f80ea2f","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":"configure should be called in the template right?  That is where creation of streams, datasets, etc may happen","created_at":"2015-03-31T19:41:23Z","updated_at":"2015-03-31T19:41:23Z","html_url":"https://github.com/caskdata/cdap/pull/1848#discussion_r27515218","pull_request_url":"https://api.github.com/repos/caskdata/cdap/pulls/1848","_links":{"self":{"href":"https://api.github.com/repos/caskdata/cdap/pulls/comments/27515218"},"html":{"href":"https://github.com/caskdata/cdap/pull/1848#discussion_r27515218"},"pull_request":{"href":"https://api.github.com/repos/caskdata/cdap/pulls/1848"}}},"pull_request":{"url":"https://api.github.com/repos/caskdata/cdap/pulls/1848","id":32294820,"html_url":"https://github.com/caskdata/cdap/pull/1848","diff_url":"https://github.com/caskdata/cdap/pull/1848.diff","patch_url":"https://github.com/caskdata/cdap/pull/1848.patch","issue_url":"https://api.github.com/repos/caskdata/cdap/issues/1848","number":1848,"state":"open","locked":false,"title":"Initial check-in of ETL Batch Driver, ETL Batch Application Template","user":{"login":"gokulavasan","id":558459,"avatar_url":"https://avatars.githubusercontent.com/u/558459?v=3","gravatar_id":"","url":"https://api.github.com/users/gokulavasan","html_url":"https://github.com/gokulavasan","followers_url":"https://api.github.com/users/gokulavasan/followers","following_url":"https://api.github.com/users/gokulavasan/following{/other_user}","gists_url":"https://api.github.com/users/gokulavasan/gists{/gist_id}","starred_url":"https://api.github.com/users/gokulavasan/starred{/owner}{/repo}","subscriptions_url":"https://api.github.com/users/gokulavasan/subscriptions","organizations_url":"https://api.github.com/users/gokulavasan/orgs","repos_url":"https://api.github.com/users/gokulavasan/repos","events_url":"https://api.github.com/users/gokulavasan/events{/privacy}","received_events_url":"https://api.github.com/users/gokulavasan/received_events","type":"User","site_admin":false},"body":"* ToDo : Yet to add tests. Opening PR to get feedback on the 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