KeyValueSortReducer (Apache HBase 1.2.12 API)

java.lang.Object
- org.apache.hadoop.mapreduce.Reducer<ImmutableBytesWritable,KeyValue,ImmutableBytesWritable,KeyValue>
- - org.apache.hadoop.hbase.mapreduce.KeyValueSortReducer

```
@InterfaceAudience.Public
@InterfaceStability.Stable
public class KeyValueSortReducer
extends org.apache.hadoop.mapreduce.Reducer<ImmutableBytesWritable,KeyValue,ImmutableBytesWritable,KeyValue>
```
Emits sorted KeyValues. Reads in all KeyValues from passed Iterator, sorts them, then emits KeyValues in sorted order. If lots of columns per row, it will use lots of memory sorting.

See Also:
HFileOutputFormat

- Nested Class Summary
  - Nested classes/interfaces inherited from class org.apache.hadoop.mapreduce.Reducer
    org.apache.hadoop.mapreduce.Reducer.Context
- Constructor Summary
  
  Constructors
  Constructor and Description
  
  KeyValueSortReducer()
- Method Summary
  
  Methods
  Modifier and Type Method and Description
  
  protected void reduce(ImmutableBytesWritable row, Iterable<KeyValue> kvs, 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

Constructors
Constructor and Description
`KeyValueSortReducer()`

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

Constructor Detail
- KeyValueSortReducer
```
public KeyValueSortReducer()
```

Method Detail

reduce

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

Overrides:: reduce in class org.apache.hadoop.mapreduce.Reducer<ImmutableBytesWritable,KeyValue,ImmutableBytesWritable,KeyValue>
Throws:: IOException; InterruptedException

Class KeyValueSortReducer

Nested Class Summary

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

Constructor Summary

Method Summary

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

Methods inherited from class java.lang.Object

Constructor Detail

KeyValueSortReducer

Method Detail

reduce