Package 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.LocalReplica

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

All Implemented Interfaces:

java.lang.Comparable<org.apache.hadoop.hdfs.protocol.Block>, Replica, org.apache.hadoop.io.Writable, org.apache.hadoop.util.LightWeightGSet.LinkedElement

public class ReplicaUnderRecovery
extends LocalReplica

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.LocalReplica

LocalReplica.ReplicaDirInfo

Field Summary

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

BLOCK_FILE_PREFIX, blockFilePattern, METADATA_EXTENSION, metaFilePattern, metaOrBlockFilePattern

Constructor Summary

Constructors

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

Method Summary

Modifier and Type	Method	Description
ReplicaRecoveryInfo	createInfo()
boolean	equals(java.lang.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()
void	setBlockId(long blockId)
void	setGenerationStamp(long gs)
void	setNumBytes(long numBytes)
void	setRecoveryID(long recoveryId)	Set the recovery id.
java.lang.String	toString()
void	updateWithReplica(StorageLocation replicaLocation)	Update this replica with the StorageLocation found.

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

blockDataExists, breakHardLinksIfNeeded, bumpReplicaGS, compareWith, copyBlockdata, copyMetadata, deleteBlockData, deleteMetadata, fsyncDirectory, getBlockDataLength, getBlockFile, getBlockURI, getDataInputStream, getDataOutputStream, getDir, getMetadataInputStream, getMetadataLength, getMetadataOutputStream, getMetadataURI, getMetaFile, getPinning, getPinning, metadataExists, parseBaseDir, renameData, renameMeta, setPinning, setPinning, truncateBlock, truncateBlock

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

getBytesReserved, getFileIoProvider, getNext, getOriginalBytesReserved, getStorageUuid, getVolume, isOnTransientStorage, setNext

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

appendStringTo, compareTo, filename2id, getBlockId, getBlockId, getBlockName, getGenerationStamp, getGenerationStamp, getNumBytes, isBlockFilename, isMetaFilename, matchingIdAndGenStamp, metaToBlockFile, readFields, readId, set, toString, 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 - where to copy from

Method Detail

getRecoveryID

public long getRecoveryID()

Description copied from class: ReplicaInfo

Get the recovery id.

Specified by:

getRecoveryID in class ReplicaInfo

Returns:

the generation stamp that the replica will be bumped to

setRecoveryID

public void setRecoveryID(long recoveryId)

Description copied from class: ReplicaInfo

Set the recovery id.

Specified by:

setRecoveryID in class ReplicaInfo

Parameters:

recoveryId - the new recoveryId

getOriginalReplica

public ReplicaInfo getOriginalReplica()

Get the original replica that's under recovery

Specified by:

getOriginalReplica in class ReplicaInfo

Returns:

the original replica under recovery

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 org.apache.hadoop.hdfs.protocol.Block

setGenerationStamp

public void setGenerationStamp(long gs)

Overrides:

setGenerationStamp in class org.apache.hadoop.hdfs.protocol.Block

setNumBytes

public void setNumBytes(long numBytes)

Overrides:

setNumBytes in class org.apache.hadoop.hdfs.protocol.Block

updateWithReplica

public void updateWithReplica(StorageLocation replicaLocation)

Description copied from class: ReplicaInfo

Update this replica with the StorageLocation found.

Overrides:

updateWithReplica in class LocalReplica

Parameters:

replicaLocation - the StorageLocation found for this replica.

equals

public boolean equals(java.lang.Object o)

Overrides:

equals in class org.apache.hadoop.hdfs.protocol.Block

hashCode

public int hashCode()

Overrides:

hashCode in class org.apache.hadoop.hdfs.protocol.Block

toString

public java.lang.String toString()

Overrides:

toString in class ReplicaInfo

createInfo

public ReplicaRecoveryInfo createInfo()

Specified by:

createInfo in class ReplicaInfo