org.apache.hadoop.hbase.mapreduce
Class PutSortReducer

java.lang.Object
  extended by org.apache.hadoop.mapreduce.Reducer<ImmutableBytesWritable,Put,ImmutableBytesWritable,KeyValue>
      extended by org.apache.hadoop.hbase.mapreduce.PutSortReducer

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:
HFileOutputFormat, KeyValueSortReducer

Nested Class Summary
 
Nested classes/interfaces inherited from class org.apache.hadoop.mapreduce.Reducer
org.apache.hadoop.mapreduce.Reducer.Context
 
Constructor Summary
PutSortReducer()
           
 
Method Summary
protected  void reduce(ImmutableBytesWritable row, Iterable<Put> puts, org.apache.hadoop.mapreduce.Reducer.Context context)
           
 
Methods inherited from class org.apache.hadoop.mapreduce.Reducer
cleanup, run, setup
 
Methods inherited from class java.lang.Object
clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait
 

Constructor Detail

PutSortReducer

public PutSortReducer()
Method Detail

reduce

protected void reduce(ImmutableBytesWritable row,
                      Iterable<Put> puts,
                      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


Copyright © 2011 The Apache Software Foundation. All Rights Reserved.