org.apache.hadoop.io

类 SequenceFile.Sorter.SegmentDescriptor

java.lang.Object

org.apache.hadoop.io.SequenceFile.Sorter.SegmentDescriptor

所有已实现的接口:

Comparable

封闭类:

SequenceFile.Sorter

public class SequenceFile.Sorter.SegmentDescriptor
extends Object
implements Comparable

This class defines a merge segment. This class can be subclassed to provide a customized cleanup method implementation. In this implementation, cleanup closes the file handle and deletes the file

构造器概要

构造器

构造器和说明
SequenceFile.Sorter.SegmentDescriptor(long segmentOffset, long segmentLength, Path segmentPathName) Constructs a segment

方法概要

方法

限定符和类型	方法和说明
void	cleanup() The default cleanup.
int	compareTo(Object o)
void	doSync() Do the sync checks
boolean	equals(Object o)
DataOutputBuffer	getKey() Returns the stored rawKey
int	hashCode()
boolean	nextRawKey() Fills up the rawKey object with the key returned by the Reader
int	nextRawValue(SequenceFile.ValueBytes rawValue) Fills up the passed rawValue with the value corresponding to the key read earlier
void	preserveInput(boolean preserve) Whether to delete the files when no longer needed
boolean	shouldPreserveInput()

从类继承的方法 java.lang.Object

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

构造器详细资料

SequenceFile.Sorter.SegmentDescriptor

public SequenceFile.Sorter.SegmentDescriptor(long segmentOffset,
                                     long segmentLength,
                                     Path segmentPathName)

Constructs a segment

参数:

segmentOffset - the offset of the segment in the file

segmentLength - the length of the segment

segmentPathName - the path name of the file containing the segment

方法详细资料

doSync

public void doSync()

Do the sync checks

preserveInput

public void preserveInput(boolean preserve)

Whether to delete the files when no longer needed

shouldPreserveInput

public boolean shouldPreserveInput()

compareTo

public int compareTo(Object o)

指定者:

compareTo 在接口中 Comparable

equals

public boolean equals(Object o)

覆盖:

equals 在类中 Object

hashCode

public int hashCode()

覆盖:

hashCode 在类中 Object

nextRawKey

public boolean nextRawKey()
                   throws IOException

Fills up the rawKey object with the key returned by the Reader

返回:

true if there is a key returned; false, otherwise

抛出:

IOException

nextRawValue

public int nextRawValue(SequenceFile.ValueBytes rawValue)
                 throws IOException

Fills up the passed rawValue with the value corresponding to the key read earlier

参数:

rawValue -

返回:

the length of the value

抛出:

IOException

getKey

public DataOutputBuffer getKey()

Returns the stored rawKey

cleanup

public void cleanup()
             throws IOException

The default cleanup. Subclasses can override this with a custom cleanup

抛出:

IOException