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 org.apache.hadoop.mapred.JobConf;
025import org.apache.hadoop.mapred.Partitioner;
026
027/** Class GroupingPartitioner is an implementation of {@link org.apache.hadoop.mapred.Partitioner}. */
028public class GroupingPartitioner extends HasherPartitioner implements Partitioner<Tuple, Tuple>
029  {
030  public int getPartition( Tuple key, Tuple value, int numReduceTasks )
031    {
032    return ( hashCode( key ) & Integer.MAX_VALUE ) % numReduceTasks;
033    }
034
035  @Override
036  public void configure( JobConf job )
037    {
038    setConf( job );
039    }
040  }