001/*
002 * Copyright (c) 2007-2017 Xplenty, Inc. All Rights Reserved.
003 *
004 * Project and contact information: http://www.cascading.org/
005 *
006 * This file is part of the Cascading project.
007 *
008 * Licensed under the Apache License, Version 2.0 (the "License");
009 * you may not use this file except in compliance with the License.
010 * You may obtain a copy of the License at
011 *
012 *     http://www.apache.org/licenses/LICENSE-2.0
013 *
014 * Unless required by applicable law or agreed to in writing, software
015 * distributed under the License is distributed on an "AS IS" BASIS,
016 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
017 * See the License for the specific language governing permissions and
018 * limitations under the License.
019 */
020
021package cascading.tuple.hadoop.util;
022
023import cascading.tuple.Tuple;
024import cascading.tuple.io.TuplePair;
025import org.apache.hadoop.mapred.JobConf;
026import org.apache.hadoop.mapred.Partitioner;
027
028/** Class GroupingSortingPartitioner is an implementation of {@link Partitioner}. */
029public class GroupingSortingPartitioner extends HasherPartitioner implements Partitioner<TuplePair, Tuple>
030  {
031  public int getPartition( TuplePair key, Tuple value, int numReduceTasks )
032    {
033    return ( hashCode( key.getLhs() ) & Integer.MAX_VALUE ) % numReduceTasks;
034    }
035
036  @Override
037  public void configure( JobConf job )
038    {
039    setConf( job );
040    }
041  }