org.apache.hadoop.hbase.mapred

Class HRegionPartitioner<K2,V2>

java.lang.Object

org.apache.hadoop.hbase.mapred.HRegionPartitioner<K2,V2>

Type Parameters:

K2 -

V2 -

All Implemented Interfaces:

org.apache.hadoop.mapred.JobConfigurable, org.apache.hadoop.mapred.Partitioner<ImmutableBytesWritable,V2>

@InterfaceAudience.Public
@InterfaceStability.Stable
public class HRegionPartitioner<K2,V2>
extends Object
implements org.apache.hadoop.mapred.Partitioner<ImmutableBytesWritable,V2>

This is used to partition the output keys into groups of keys. Keys are grouped according to the regions that currently exist so that each reducer fills a single region so load is distributed.

Constructor Summary

Constructors

Constructor and Description
HRegionPartitioner()

Method Summary

Methods

Modifier and Type	Method and Description
void	configure(org.apache.hadoop.mapred.JobConf job)
int	getPartition(ImmutableBytesWritable key, V2 value, int numPartitions)

Methods inherited from class java.lang.Object

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

Constructor Detail

HRegionPartitioner

public HRegionPartitioner()

Method Detail

configure

public void configure(org.apache.hadoop.mapred.JobConf job)

Specified by:

configure in interface org.apache.hadoop.mapred.JobConfigurable

getPartition

public int getPartition(ImmutableBytesWritable key,
               V2 value,
               int numPartitions)

Specified by:

getPartition in interface org.apache.hadoop.mapred.Partitioner<ImmutableBytesWritable,V2>