Package org.apache.hadoop.hbase.mapreduce

Class PutSortReducer

java.lang.Object

org.apache.hadoop.mapreduce.Reducer<ImmutableBytesWritable,Put,ImmutableBytesWritable,KeyValue>

org.apache.hadoop.hbase.mapreduce.PutSortReducer

@Public
public class PutSortReducer
extends org.apache.hadoop.mapreduce.Reducer<ImmutableBytesWritable,Put,ImmutableBytesWritable,KeyValue>

Emits sorted Puts. Reads in all Puts from passed Iterator, sorts them, then emits Puts in sorted order. If lots of columns per row, it will use lots of memory sorting.

See Also:

• HFileOutputFormat2
• CellSortReducer

Nested Class Summary

Nested classes/interfaces inherited from class org.apache.hadoop.mapreduce.Reducer

org.apache.hadoop.mapreduce.Reducer.Context

Field Summary

Fields

Modifier and Type	Field	Description
private CellCreator	kvCreator

Constructor Summary

Constructors

Constructor	Description
PutSortReducer()

Method Summary

Modifier and Type	Method	Description
protected void	reduce(ImmutableBytesWritable row, Iterable<Put> puts, org.apache.hadoop.mapreduce.Reducer<ImmutableBytesWritable,Put,ImmutableBytesWritable,KeyValue>.org.apache.hadoop.mapreduce.Reducer.Context context)
protected void	setup(org.apache.hadoop.mapreduce.Reducer<ImmutableBytesWritable,Put,ImmutableBytesWritable,KeyValue>.org.apache.hadoop.mapreduce.Reducer.Context context)

Methods inherited from class org.apache.hadoop.mapreduce.Reducer

cleanup, run

Methods inherited from class java.lang.Object

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

Field Details

kvCreator

private CellCreator kvCreator

Constructor Details

PutSortReducer

public PutSortReducer()

Method Details

setup

protected void setup(org.apache.hadoop.mapreduce.Reducer<ImmutableBytesWritable,Put,ImmutableBytesWritable,KeyValue>.org.apache.hadoop.mapreduce.Reducer.Context context)
              throws IOException,
InterruptedException

Overrides:

setup in class org.apache.hadoop.mapreduce.Reducer<ImmutableBytesWritable,Put,ImmutableBytesWritable,KeyValue>

Throws:

IOException

InterruptedException

reduce

protected void reduce(ImmutableBytesWritable row,
 Iterable<Put> puts,
 org.apache.hadoop.mapreduce.Reducer<ImmutableBytesWritable,Put,ImmutableBytesWritable,KeyValue>.org.apache.hadoop.mapreduce.Reducer.Context context)
               throws IOException,
InterruptedException

Overrides:

reduce in class org.apache.hadoop.mapreduce.Reducer<ImmutableBytesWritable,Put,ImmutableBytesWritable,KeyValue>

Throws:

IOException

InterruptedException