GenericTransCombiner.java

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 * Pentaho Big Data
 *
 * Copyright (C) 2002-2015 by Pentaho : http://www.pentaho.com
 *
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 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with
 * the License. You may obtain a copy of the License at
 *
 *    http://www.apache.org/licenses/LICENSE-2.0
 *
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package org.pentaho.hadoop.mapreduce;

import org.apache.hadoop.io.Writable;
import org.apache.hadoop.io.WritableComparable;
import org.pentaho.di.core.exception.KettleException;

import java.util.Iterator;

/**
 * Executes a transformation as configured by the job's {@code Configuration} to reduce network traffic and disk I/O.
 */
public class GenericTransCombiner<K extends WritableComparable<?>, V extends Iterator<Writable>, K2, V2>
  extends GenericTransReduce<K, V, K2, V2> {

  public GenericTransCombiner() throws KettleException {
    this.setMRType( MROperations.Combine );
  }

  @Override
  public boolean isSingleThreaded() {
    return combineSingleThreaded;
  }

  @Override
  public String getInputStepName() {
    return combinerInputStepName;
  }

  @Override
  public String getOutputStepName() {
    return combinerOutputStepName;
  }
}