HRegionPartitioner (Apache HBase 1.2.12 API)

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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.

Field Summary

Fields
Modifier and Type	Field and Description
`private Connection`	`connection`
`private RegionLocator`	`locator`
`private static org.apache.commons.logging.Log`	`LOG`
`private byte[][]`	`startKeys`

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

Field Detail

LOG

private static final org.apache.commons.logging.Log LOG

connection
```
private Connection connection
```

locator
```
private RegionLocator locator
```

startKeys
```
private byte[][] startKeys
```

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>

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