org.apache.hadoop.mapred

Class Task.CombineValuesIterator<KEY,VALUE>

java.lang.Object

org.apache.hadoop.mapred.Task.CombineValuesIterator<KEY,VALUE>

All Implemented Interfaces:

Iterator<VALUE>

Enclosing class:

Task

@InterfaceAudience.Private
 @InterfaceStability.Unstable
public static class Task.CombineValuesIterator<KEY,VALUE>
extends Object

Iterator to return Combined values

Field Summary

Fields

Modifier and Type	Field and Description
protected RawKeyValueIterator	in
protected org.apache.hadoop.util.Progressable	reporter

Constructor Summary

Constructors

Constructor and Description
CombineValuesIterator(RawKeyValueIterator in, org.apache.hadoop.io.RawComparator<KEY> comparator, Class<KEY> keyClass, Class<VALUE> valClass, org.apache.hadoop.conf.Configuration conf, Reporter reporter, Counters.Counter combineInputCounter)

Method Summary

Modifier and Type	Method and Description
KEY	getKey() The current key.
boolean	hasNext()
boolean	more() True iff more keys remain.
VALUE	next()
void	nextKey() Start processing next unique key.
void	remove()

Methods inherited from class java.lang.Object

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

Methods inherited from interface java.util.Iterator

forEachRemaining

Field Detail

in

protected RawKeyValueIterator in

reporter

protected org.apache.hadoop.util.Progressable reporter

Constructor Detail

CombineValuesIterator

public CombineValuesIterator(RawKeyValueIterator in,
                             org.apache.hadoop.io.RawComparator<KEY> comparator,
                             Class<KEY> keyClass,
                             Class<VALUE> valClass,
                             org.apache.hadoop.conf.Configuration conf,
                             Reporter reporter,
                             Counters.Counter combineInputCounter)
                      throws IOException

Throws:

IOException

Method Detail

next

public VALUE next()

Specified by:

next in interface Iterator<VALUE>

hasNext

public boolean hasNext()

Specified by:

hasNext in interface Iterator<VALUE>

remove

public void remove()

Specified by:

remove in interface Iterator<VALUE>

nextKey

public void nextKey()
             throws IOException

Start processing next unique key.

Throws:

IOException

more

public boolean more()

True iff more keys remain.

getKey

public KEY getKey()

The current key.