Package org.apache.hadoop.io

Class BloomMapFile

java.lang.Object

org.apache.hadoop.io.BloomMapFile

@Public
@Stable
public class BloomMapFile
extends java.lang.Object

This class extends MapFile and provides very much the same functionality. However, it uses dynamic Bloom filters to provide quick membership test for keys, and it offers a fast version of BloomMapFile.Reader.get(WritableComparable, Writable) operation, especially in case of sparsely populated MapFile-s.

Nested Class Summary

Nested Classes

Modifier and Type	Class	Description
static class	BloomMapFile.Reader
static class	BloomMapFile.Writer

Field Summary

Fields

Modifier and Type	Field	Description
static java.lang.String	BLOOM_FILE_NAME
static int	HASH_COUNT

Constructor Summary

Constructors

Constructor	Description
BloomMapFile()

Method Summary

Modifier and Type	Method	Description
static void	delete(FileSystem fs, java.lang.String name)

Methods inherited from class java.lang.Object

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

Field Detail

BLOOM_FILE_NAME

public static final java.lang.String BLOOM_FILE_NAME

See Also:

Constant Field Values

HASH_COUNT

public static final int HASH_COUNT

See Also:

Constant Field Values

Constructor Detail

BloomMapFile

public BloomMapFile()

Method Detail

delete

public static void delete(FileSystem fs,
                          java.lang.String name)
                   throws java.io.IOException

Throws:

java.io.IOException