CoGroupingPartitioner.java

/*
 * Copyright (c) 2007-2010 Concurrent, Inc. All Rights Reserved.
 *
 * Project and contact information: http://www.cascading.org/
 *
 * This file is part of the Cascading project.
 *
 * Cascading is free software: you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation, either version 3 of the License, or
 * (at your option) any later version.
 *
 * Cascading is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with Cascading.  If not, see <http://www.gnu.org/licenses/>.
 */

package cascading.tuple.hadoop;

import cascading.tuple.IndexTuple;
import cascading.tuple.Tuple;
import org.apache.hadoop.mapred.JobConf;
import org.apache.hadoop.mapred.Partitioner;

/** Class GroupingPartitioner is an implementation of {@link org.apache.hadoop.mapred.Partitioner}. */
public class CoGroupingPartitioner implements Partitioner<IndexTuple, Tuple>
  {
  public int getPartition( IndexTuple key, Tuple value, int numReduceTasks )
    {
    return ( key.getTuple().hashCode() & Integer.MAX_VALUE ) % numReduceTasks;
    }

  public void configure( JobConf jobConf )
    {

    }
  }