org.apache.hadoop.mapred.lib

Class KeyFieldBasedComparator<K,V>

java.lang.Object

org.apache.hadoop.io.WritableComparator

org.apache.hadoop.mapred.lib.KeyFieldBasedComparator<K,V>

All Implemented Interfaces:

java.util.Comparator, org.apache.hadoop.conf.Configurable, org.apache.hadoop.io.RawComparator, JobConfigurable

public class KeyFieldBasedComparator<K,V>
extends org.apache.hadoop.io.WritableComparator
implements JobConfigurable

This comparator implementation provides a subset of the features provided by the Unix/GNU Sort. In particular, the supported features are: -n, (Sort numerically) -r, (Reverse the result of comparison) -k pos1[,pos2], where pos is of the form f[.c][opts], where f is the number of the field to use, and c is the number of the first character from the beginning of the field. Fields and character posns are numbered starting with 1; a character position of zero in pos2 indicates the field's last character. If '.c' is omitted from pos1, it defaults to 1 (the beginning of the field); if omitted from pos2, it defaults to 0 (the end of the field). opts are ordering options (any of 'nr' as described above). We assume that the fields in the key are separated by map.output.key.field.separator.

Constructor Summary

Constructors

Constructor and Description
KeyFieldBasedComparator()

Method Summary

Methods

Modifier and Type	Method and Description
int	compare(byte[] b1, int s1, int l1, byte[] b2, int s2, int l2)
void	configure(JobConf job) Initializes a new instance from a JobConf.

Methods inherited from class org.apache.hadoop.io.WritableComparator

compare, compare, compareBytes, define, get, get, getConf, getKeyClass, hashBytes, hashBytes, newKey, readDouble, readFloat, readInt, readLong, readUnsignedShort, readVInt, readVLong, setConf

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

Constructor Detail

KeyFieldBasedComparator

public KeyFieldBasedComparator()

Method Detail

configure

public void configure(JobConf job)

Description copied from interface: JobConfigurable

Initializes a new instance from a JobConf.

Specified by:

configure in interface JobConfigurable

Parameters:

job - the configuration

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

Overrides:

compare in class org.apache.hadoop.io.WritableComparator