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 }