org.apache.hadoop.mapreduce.task.reduce
Class InMemoryReader<K,V>

java.lang.Object
  org.apache.hadoop.mapred.IFile.Reader<K,V>
      org.apache.hadoop.mapreduce.task.reduce.InMemoryReader<K,V>

@InterfaceAudience.Private
@InterfaceStability.Unstable
public class InMemoryReader<K,V>
extends IFile.Reader<K,V>

IFile.InMemoryReader to read map-outputs present in-memory.

Field Summary

Fields inherited from class org.apache.hadoop.mapred.IFile.Reader

buffer, bufferSize, bytesRead, currentKeyLength, currentValueLength, dataIn, eof, fileLength, recNo

Constructor Summary

InMemoryReader(MergeManager<K,V> merger, TaskAttemptID taskAttemptId, byte[] data, int start, int length)

Method Summary

void	close()
long	getLength()
long	getPosition()
boolean	nextRawKey(org.apache.hadoop.io.DataInputBuffer key)
void	nextRawValue(org.apache.hadoop.io.DataInputBuffer value)
void	reset(int offset)

Methods inherited from class org.apache.hadoop.mapred.IFile.Reader

disableChecksumValidation, positionToNextRecord

Methods inherited from class java.lang.Object

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

Constructor Detail

InMemoryReader

public InMemoryReader(MergeManager<K,V> merger,
                      TaskAttemptID taskAttemptId,
                      byte[] data,
                      int start,
                      int length)
               throws IOException

Throws:

IOException

Method Detail

reset

public void reset(int offset)

Overrides:

reset in class IFile.Reader<K,V>

getPosition

public long getPosition()
                 throws IOException

Overrides:

getPosition in class IFile.Reader<K,V>

Throws:

IOException

getLength

public long getLength()

Overrides:

getLength in class IFile.Reader<K,V>

nextRawKey

public boolean nextRawKey(org.apache.hadoop.io.DataInputBuffer key)
                   throws IOException

Overrides:

nextRawKey in class IFile.Reader<K,V>

Throws:

IOException

nextRawValue

public void nextRawValue(org.apache.hadoop.io.DataInputBuffer value)
                  throws IOException

Overrides:

nextRawValue in class IFile.Reader<K,V>

Throws:

IOException

close

public void close()

Overrides:

close in class IFile.Reader<K,V>