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

Class LevelDBFileRegionAliasMap

java.lang.Object

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

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

All Implemented Interfaces:

Configurable

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

A LevelDB based implementation of BlockAliasMap.

Field Summary

Fields

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

Constructor Summary

Constructors

Constructor and Description
LevelDBFileRegionAliasMap()

Method Summary

Modifier and Type	Method and Description
void	close()
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

LevelDBFileRegionAliasMap

public LevelDBFileRegionAliasMap()

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

getConf

public Configuration getConf()

Description copied from interface: Configurable

Return the configuration used by this object.

Specified by:

getConf in interface Configurable

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