org.apache.hadoop.hdfs.server.common.blockaliasmap.impl

Class TextFileRegionAliasMap

java.lang.Object

org.apache.hadoop.hdfs.server.common.blockaliasmap.BlockAliasMap<FileRegion>

org.apache.hadoop.hdfs.server.common.blockaliasmap.impl.TextFileRegionAliasMap

All Implemented Interfaces:

Configurable

@InterfaceAudience.Public
 @InterfaceStability.Unstable
public class TextFileRegionAliasMap
extends BlockAliasMap<FileRegion>
implements Configurable

This class is used for block maps stored as text files, with a specified delimiter.

Field Summary

Fields

Modifier and Type	Field and Description
static org.slf4j.Logger	LOG

Constructor Summary

Constructors

Constructor and Description
TextFileRegionAliasMap()

Method Summary

Modifier and Type	Method and Description
static String	blockPoolIDFromFileName(Path file)
void	close()
static String	fileNameFromBlockPoolID(String blockPoolID)
Configuration	getConf() Return the configuration used by this object.
org.apache.hadoop.hdfs.server.common.blockaliasmap.BlockAliasMap.Reader<FileRegion>	getReader(org.apache.hadoop.hdfs.server.common.blockaliasmap.BlockAliasMap.Reader.Options opts, String blockPoolID) Returns a reader to the alias map.
org.apache.hadoop.hdfs.server.common.blockaliasmap.BlockAliasMap.Writer<FileRegion>	getWriter(org.apache.hadoop.hdfs.server.common.blockaliasmap.BlockAliasMap.Writer.Options opts, String blockPoolID) Returns the writer for the alias map.
void	refresh() Refresh the alias map.
void	setConf(Configuration conf) Set the configuration to be used by this object.

Methods inherited from class java.lang.Object

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

Field Detail

LOG

public static final org.slf4j.Logger LOG

Constructor Detail

TextFileRegionAliasMap

public TextFileRegionAliasMap()

Method Detail

setConf

public void setConf(Configuration conf)

Description copied from interface: Configurable

Set the configuration to be used by this object.

Specified by:

setConf in interface Configurable

Parameters:

conf - configuration to be used

getConf

public Configuration getConf()

Description copied from interface: Configurable

Return the configuration used by this object.

Specified by:

getConf in interface Configurable

Returns:

Configuration

getReader

public org.apache.hadoop.hdfs.server.common.blockaliasmap.BlockAliasMap.Reader<FileRegion> getReader(org.apache.hadoop.hdfs.server.common.blockaliasmap.BlockAliasMap.Reader.Options opts,
                                                                                                     String blockPoolID)
                                                                                              throws IOException

Description copied from class: BlockAliasMap

Returns a reader to the alias map.

Specified by:

getReader in class BlockAliasMap<FileRegion>

Parameters:

opts - reader options

blockPoolID - block pool id to use

Returns:

BlockAliasMap.Reader to the alias map. If a Reader for the blockPoolID cannot be created, this will return null.

Throws:

IOException

getWriter

public org.apache.hadoop.hdfs.server.common.blockaliasmap.BlockAliasMap.Writer<FileRegion> getWriter(org.apache.hadoop.hdfs.server.common.blockaliasmap.BlockAliasMap.Writer.Options opts,
                                                                                                     String blockPoolID)
                                                                                              throws IOException

Description copied from class: BlockAliasMap

Returns the writer for the alias map.

Specified by:

getWriter in class BlockAliasMap<FileRegion>

Parameters:

opts - writer options.

blockPoolID - block pool id to use

Returns:

BlockAliasMap.Writer to the alias map.

Throws:

IOException

refresh

public void refresh()
             throws IOException

Description copied from class: BlockAliasMap

Refresh the alias map.

Specified by:

refresh in class BlockAliasMap<FileRegion>

Throws:

IOException

close

public void close()
           throws IOException

Specified by:

close in class BlockAliasMap<FileRegion>

Throws:

IOException

blockPoolIDFromFileName

public static String blockPoolIDFromFileName(Path file)

fileNameFromBlockPoolID

public static String fileNameFromBlockPoolID(String blockPoolID)