io.cdap.cdap.internal.app.runtime.batch.MapReduceBatchWritableOutputFormat Maven / Gradle / Ivy
/*
* Copyright © 2015 Cask Data, Inc.
*
* Licensed under the Apache License, Version 2.0 (the "License"); you may not
* use this file except in compliance with the License. You may obtain a copy of
* the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
* WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
* License for the specific language governing permissions and limitations under
* the License.
*/
package io.cdap.cdap.internal.app.runtime.batch;
import io.cdap.cdap.api.data.batch.BatchWritable;
import io.cdap.cdap.internal.app.runtime.batch.dataset.AbstractBatchWritableOutputFormat;
import io.cdap.cdap.internal.app.runtime.batch.dataset.CloseableBatchWritable;
import org.apache.hadoop.mapreduce.OutputFormat;
import org.apache.hadoop.mapreduce.TaskAttemptContext;
import java.util.Map;
/**
* An {@link OutputFormat} for writing data from {@link BatchWritable} for MapReduce.
* @param Type of key.
* @param Type of value.
*/
public class MapReduceBatchWritableOutputFormat extends AbstractBatchWritableOutputFormat {
@Override
protected CloseableBatchWritable createBatchWritable(TaskAttemptContext context,
String namespace,
String datasetName,
Map datasetArgs) {
MapReduceClassLoader classLoader = MapReduceClassLoader.getFromConfiguration(context.getConfiguration());
BasicMapReduceTaskContext taskContext = classLoader.getTaskContextProvider().get(context);
return taskContext.getBatchWritable(namespace, datasetName, datasetArgs);
}
}