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:

org.apache.hadoop.conf.Configurable

Direct Known Subclasses:

FixedBlockMultiReplicaResolver

@Public
@Unstable
public class FixedBlockResolver
extends BlockResolver
implements org.apache.hadoop.conf.Configurable

Resolver mapping all files to a configurable, uniform blocksize.

Field Summary

Fields

Modifier and Type	Field	Description
static java.lang.String	BLOCKSIZE
static long	BLOCKSIZE_DEFAULT
static java.lang.String	START_BLOCK

Constructor Summary

Constructors

Constructor	Description
FixedBlockResolver()

Method Summary

Modifier and Type	Method	Description
protected java.util.List<java.lang.Long>	blockLengths(org.apache.hadoop.fs.FileStatus s)
org.apache.hadoop.conf.Configuration	getConf()
int	getReplication(org.apache.hadoop.fs.FileStatus s)
long	lastId()
long	nextId()
long	preferredBlockSize(org.apache.hadoop.fs.FileStatus s)
void	setConf(org.apache.hadoop.conf.Configuration conf)

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 Detail

BLOCKSIZE

public static final java.lang.String BLOCKSIZE

See Also:

Constant Field Values

START_BLOCK

public static final java.lang.String START_BLOCK

See Also:

Constant Field Values

BLOCKSIZE_DEFAULT

public static final long BLOCKSIZE_DEFAULT

See Also:

Constant Field Values

Constructor Detail

FixedBlockResolver

public FixedBlockResolver()

Method Detail

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

blockLengths

protected java.util.List<java.lang.Long> blockLengths(org.apache.hadoop.fs.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(org.apache.hadoop.fs.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(org.apache.hadoop.fs.FileStatus s)

Specified by:

getReplication in class BlockResolver

Parameters:

s - the external reference.

Returns:

the replication to assign to this external reference.