    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  }