org.apache.hadoop.hdfs.server.datanode

Class ReplicaUnderRecovery

java.lang.Object

org.apache.hadoop.hdfs.protocol.Block

org.apache.hadoop.hdfs.server.datanode.ReplicaInfo

org.apache.hadoop.hdfs.server.datanode.ReplicaUnderRecovery

All Implemented Interfaces:

Comparable<Block>, Replica, Writable

public class ReplicaUnderRecovery
extends ReplicaInfo

This class represents replicas that are under block recovery It has a recovery id that is equal to the generation stamp that the replica will be bumped to after recovery The recovery id is used to handle multiple concurrent block recoveries. A recovery with higher recovery id preempts recoveries with a lower id.

Nested Class Summary

Nested classes/interfaces inherited from class org.apache.hadoop.hdfs.server.datanode.ReplicaInfo

ReplicaInfo.ReplicaDirInfo

Field Summary

Fields inherited from class org.apache.hadoop.hdfs.protocol.Block

BLOCK_FILE_PREFIX, blockFilePattern, METADATA_EXTENSION, metaFilePattern

Constructor Summary

Constructors

Constructor and Description
ReplicaUnderRecovery(ReplicaInfo replica, long recoveryId)
ReplicaUnderRecovery(ReplicaUnderRecovery from) Copy constructor.

Method Summary

Methods

Modifier and Type	Method and Description
ReplicaRecoveryInfo	createInfo()
boolean	equals(Object o)
long	getBytesOnDisk() Get the number of bytes that have written to disk
ReplicaInfo	getOriginalReplica() Get the original replica that's under recovery
long	getRecoveryID() Get the recovery id
HdfsServerConstants.ReplicaState	getState() Get the replica state
long	getVisibleLength() Get the number of bytes that are visible to readers
int	hashCode()
boolean	isUnlinked() check if this replica has already been unlinked.
void	setBlockId(long blockId)
void	setDir(File dir) Set the parent directory where this replica is located
void	setGenerationStamp(long gs)
void	setNumBytes(long numBytes)
void	setRecoveryID(long recoveryId) Set the recovery id
void	setUnlinked() set that this replica is unlinked
String	toString()

Methods inherited from class org.apache.hadoop.hdfs.server.datanode.ReplicaInfo

getBlockFile, getMetaFile, getVolume, parseSubDirs, unlinkBlock

Methods inherited from class org.apache.hadoop.hdfs.protocol.Block

appendStringTo, compareTo, filename2id, getBlockId, getBlockId, getBlockName, getGenerationStamp, getGenerationStamp, getNumBytes, isBlockFilename, isMetaFilename, matchingIdAndGenStamp, readFields, readId, set, write, writeId

Methods inherited from class java.lang.Object

clone, finalize, getClass, notify, notifyAll, wait, wait, wait

Methods inherited from interface org.apache.hadoop.hdfs.server.datanode.Replica

getBlockId, getGenerationStamp, getNumBytes

Constructor Detail

ReplicaUnderRecovery

public ReplicaUnderRecovery(ReplicaInfo replica,
                    long recoveryId)

ReplicaUnderRecovery

public ReplicaUnderRecovery(ReplicaUnderRecovery from)

Copy constructor.

Parameters:

from -

Method Detail

getRecoveryID

public long getRecoveryID()

Get the recovery id

Returns:

the generation stamp that the replica will be bumped to

setRecoveryID

public void setRecoveryID(long recoveryId)

Set the recovery id

Parameters:

recoveryId - the new recoveryId

getOriginalReplica

public ReplicaInfo getOriginalReplica()

Get the original replica that's under recovery

Returns:

the original replica under recovery

isUnlinked

public boolean isUnlinked()

Description copied from class: ReplicaInfo

check if this replica has already been unlinked.

Overrides:

isUnlinked in class ReplicaInfo

Returns:

true if the replica has already been unlinked or no need to be detached; false otherwise

setUnlinked

public void setUnlinked()

Description copied from class: ReplicaInfo

set that this replica is unlinked

Overrides:

setUnlinked in class ReplicaInfo

getState

public HdfsServerConstants.ReplicaState getState()

Description copied from interface: Replica

Get the replica state

Returns:

the replica state

getVisibleLength

public long getVisibleLength()

Description copied from interface: Replica

Get the number of bytes that are visible to readers

Returns:

the number of bytes that are visible to readers

getBytesOnDisk

public long getBytesOnDisk()

Description copied from interface: Replica

Get the number of bytes that have written to disk

Returns:

the number of bytes that have written to disk

setBlockId

public void setBlockId(long blockId)

Overrides:

setBlockId in class Block

setGenerationStamp

public void setGenerationStamp(long gs)

Overrides:

setGenerationStamp in class Block

setNumBytes

public void setNumBytes(long numBytes)

Overrides:

setNumBytes in class Block

setDir

public void setDir(File dir)

Description copied from class: ReplicaInfo

Set the parent directory where this replica is located

Overrides:

setDir in class ReplicaInfo

Parameters:

dir - the parent directory where the replica is located

equals

public boolean equals(Object o)

Overrides:

equals in class Block

hashCode

public int hashCode()

Overrides:

hashCode in class Block

toString

public String toString()

Overrides:

toString in class ReplicaInfo

createInfo

public ReplicaRecoveryInfo createInfo()