    001    /*
    002     * Copyright (c) 2007-2014 Concurrent, 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
    021    package cascading.tuple.hadoop.util;
    022
    023    import cascading.tuple.Tuple;
    024    import cascading.tuple.io.IndexTuple;
    025    import org.apache.hadoop.mapred.Partitioner;
    026
    027    /** Class GroupingPartitioner is an implementation of {@link org.apache.hadoop.mapred.Partitioner}. */
    028    public class CoGroupingPartitioner extends HasherPartitioner implements Partitioner<IndexTuple, Tuple>
    029      {
    030      public int getPartition( IndexTuple key, Tuple value, int numReduceTasks )
    031        {
    032        return ( hashCode( key.getTuple() ) & Integer.MAX_VALUE ) % numReduceTasks;
    033        }
    034      }