Package org.apache.hadoop.examples

Class SecondarySort.FirstGroupingComparator

java.lang.Object

org.apache.hadoop.examples.SecondarySort.FirstGroupingComparator

All Implemented Interfaces:

java.util.Comparator<SecondarySort.IntPair>, org.apache.hadoop.io.RawComparator<SecondarySort.IntPair>

Enclosing class:

SecondarySort

public static class SecondarySort.FirstGroupingComparator
extends java.lang.Object
implements org.apache.hadoop.io.RawComparator<SecondarySort.IntPair>

Compare only the first part of the pair, so that reduce is called once for each value of the first part.

Constructor Summary

Constructors

Constructor	Description
FirstGroupingComparator()

Method Summary

Modifier and Type	Method	Description
int	compare(byte[] b1, int s1, int l1, byte[] b2, int s2, int l2)
int	compare(SecondarySort.IntPair o1, SecondarySort.IntPair o2)

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Methods inherited from interface java.util.Comparator

equals, reversed, thenComparing, thenComparing, thenComparing, thenComparingDouble, thenComparingInt, thenComparingLong

Constructor Detail

FirstGroupingComparator

public FirstGroupingComparator()

Method Detail

compare

public int compare(byte[] b1,
                   int s1,
                   int l1,
                   byte[] b2,
                   int s2,
                   int l2)

Specified by:

compare in interface org.apache.hadoop.io.RawComparator<SecondarySort.IntPair>

compare

public int compare(SecondarySort.IntPair o1,
                   SecondarySort.IntPair o2)

Specified by:

compare in interface java.util.Comparator<SecondarySort.IntPair>