Package org.apache.hadoop.hdfs.server.namenode

Class FixedBlockResolver

java.lang.Object

org.apache.hadoop.hdfs.server.namenode.BlockResolver

org.apache.hadoop.hdfs.server.namenode.FixedBlockResolver

All Implemented Interfaces:

Configurable

Direct Known Subclasses:

FixedBlockMultiReplicaResolver

@Public
@Unstable
public class FixedBlockResolver
extends BlockResolver
implements Configurable

Resolver mapping all files to a configurable, uniform blocksize.

Field Summary

Fields

Modifier and Type	Field	Description
static final String	BLOCKSIZE
static final long	BLOCKSIZE_DEFAULT
static final String	START_BLOCK

Constructor Summary

Constructors

Constructor	Description
FixedBlockResolver()

Method Summary

Modifier and Type	Method	Description
protected List<Long>	blockLengths(FileStatus s)
Configuration	getConf()	Return the configuration used by this object.
int	getReplication(FileStatus s)
long	lastId()
long	nextId()
long	preferredBlockSize(FileStatus s)
void	setConf(Configuration conf)	Set the configuration to be used by this object.

Methods inherited from class org.apache.hadoop.hdfs.server.namenode.BlockResolver

buildBlock, buildBlock, resolve

Methods inherited from class java.lang.Object

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

Field Details

BLOCKSIZE

public static final String BLOCKSIZE

See Also:

• Constant Field Values

START_BLOCK

public static final String START_BLOCK

See Also:

• Constant Field Values

BLOCKSIZE_DEFAULT

public static final long BLOCKSIZE_DEFAULT

See Also:

• Constant Field Values

Constructor Details

FixedBlockResolver

public FixedBlockResolver()

Method Details

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

blockLengths

protected List<Long> blockLengths(FileStatus s)

Specified by:

blockLengths in class BlockResolver

Parameters:

s - the external reference.

Returns:

the lengths of the resultant blocks.

nextId

public long nextId()

Specified by:

nextId in class BlockResolver

Returns:

the next block id.

lastId

public long lastId()

Specified by:

lastId in class BlockResolver

Returns:

the maximum sequentially allocated block ID for this filesystem.

preferredBlockSize

public long preferredBlockSize(FileStatus s)

Overrides:

preferredBlockSize in class BlockResolver

Parameters:

s - the external reference.

Returns:

the block size to assign to this external reference.

getReplication

public int getReplication(FileStatus s)

Specified by:

getReplication in class BlockResolver

Parameters:

s - the external reference.

Returns:

the replication to assign to this external reference.