CompositeKeyPartitioner.java

package hip.ch6.joins.repartition.impl;

import org.apache.hadoop.mapred.JobConf;
import org.apache.hadoop.mapred.Partitioner;

public class CompositeKeyPartitioner implements
    Partitioner<CompositeKey, OutputValue> {

  @Override
  public int getPartition(CompositeKey key, OutputValue value,
                          int numPartitions) {
    return Math.abs(key.getKey().hashCode() * 127) % numPartitions;
  }

  @Override
  public void configure(JobConf job) {
  }
}