Package org.apache.hadoop.hdfs.server.aliasmap

Class InMemoryLevelDBAliasMapServer

java.lang.Object

org.apache.hadoop.hdfs.server.aliasmap.InMemoryLevelDBAliasMapServer

All Implemented Interfaces:

Closeable, AutoCloseable, org.apache.hadoop.conf.Configurable, InMemoryAliasMapProtocol

@Private
@Unstable
public class InMemoryLevelDBAliasMapServer
extends Object
implements InMemoryAliasMapProtocol, org.apache.hadoop.conf.Configurable, Closeable

InMemoryLevelDBAliasMapServer is the entry point from the Namenode into the InMemoryAliasMap.

Nested Class Summary

Nested classes/interfaces inherited from interface org.apache.hadoop.hdfs.server.aliasmap.InMemoryAliasMapProtocol

InMemoryAliasMapProtocol.IterationResult

Constructor Summary

Constructors

Constructor	Description
InMemoryLevelDBAliasMapServer(InMemoryAliasMap.CheckedFunction2<org.apache.hadoop.conf.Configuration,String,InMemoryAliasMap> initFun, String blockPoolId)

Method Summary

Modifier and Type	Method	Description
void	close()
InMemoryAliasMap	getAliasMap()	Get the InMemoryAliasMap used by this server.
String	getBlockPoolId()	Get the associated block pool id.
org.apache.hadoop.conf.Configuration	getConf()
InMemoryAliasMapProtocol.IterationResult	list(Optional<org.apache.hadoop.hdfs.protocol.Block> marker)	List the next batch of FileRegions in the alias map starting from the given marker.
Optional<org.apache.hadoop.hdfs.protocol.ProvidedStorageLocation>	read(org.apache.hadoop.hdfs.protocol.Block block)	Gets the ProvidedStorageLocation associated with the specified block.
void	setConf(org.apache.hadoop.conf.Configuration conf)
void	start()
void	write(org.apache.hadoop.hdfs.protocol.Block block, org.apache.hadoop.hdfs.protocol.ProvidedStorageLocation providedStorageLocation)	Stores the block and it's associated ProvidedStorageLocation in the alias map.

Methods inherited from class java.lang.Object

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

Constructor Details

InMemoryLevelDBAliasMapServer

public InMemoryLevelDBAliasMapServer(InMemoryAliasMap.CheckedFunction2<org.apache.hadoop.conf.Configuration,String,InMemoryAliasMap> initFun,
 String blockPoolId)

Method Details

start

public void start()
           throws IOException

Throws:

IOException

list

public InMemoryAliasMapProtocol.IterationResult list(Optional<org.apache.hadoop.hdfs.protocol.Block> marker)
                                              throws IOException

Description copied from interface: InMemoryAliasMapProtocol

List the next batch of FileRegions in the alias map starting from the given marker. To retrieve all FileRegions stored in the alias map, multiple calls to this function might be required.

Specified by:

list in interface InMemoryAliasMapProtocol

Parameters:

marker - the next block to get fileregions from.

Returns:

the InMemoryAliasMapProtocol.IterationResult with a set of FileRegions and the next marker.

Throws:

IOException

read

@Nonnull
public Optional<org.apache.hadoop.hdfs.protocol.ProvidedStorageLocation> read(@Nonnull
 org.apache.hadoop.hdfs.protocol.Block block)
                                                                       throws IOException

Description copied from interface: InMemoryAliasMapProtocol

Gets the ProvidedStorageLocation associated with the specified block.

Specified by:

read in interface InMemoryAliasMapProtocol

Parameters:

block - the block to lookup

Returns:

the associated ProvidedStorageLocation.

Throws:

IOException

write

public void write(@Nonnull
 org.apache.hadoop.hdfs.protocol.Block block,
 @Nonnull
 org.apache.hadoop.hdfs.protocol.ProvidedStorageLocation providedStorageLocation)
           throws IOException

Description copied from interface: InMemoryAliasMapProtocol

Stores the block and it's associated ProvidedStorageLocation in the alias map.

Specified by:

write in interface InMemoryAliasMapProtocol

Throws:

IOException

getBlockPoolId

public String getBlockPoolId()

Description copied from interface: InMemoryAliasMapProtocol

Get the associated block pool id.

Specified by:

getBlockPoolId in interface InMemoryAliasMapProtocol

Returns:

the block pool id associated with the Namenode running the in-memory alias map.

setConf

public void setConf(org.apache.hadoop.conf.Configuration conf)

Specified by:

setConf in interface org.apache.hadoop.conf.Configurable

getConf

public org.apache.hadoop.conf.Configuration getConf()

Specified by:

getConf in interface org.apache.hadoop.conf.Configurable

getAliasMap

public InMemoryAliasMap getAliasMap()

Get the InMemoryAliasMap used by this server.

Returns:

the inmemoryaliasmap used.

close

public void close()

Specified by:

close in interface AutoCloseable

Specified by:

close in interface Closeable