Package org.apache.hadoop.hdfs.server.datanode

Class ReplicaWaitingToBeRecovered

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.ReplicaWaitingToBeRecovered

All Implemented Interfaces:

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

public class ReplicaWaitingToBeRecovered
extends LocalReplica

This class represents a replica that is waiting to be recovered. After a datanode restart, any replica in "rbw" directory is loaded as a replica waiting to be recovered. A replica waiting to be recovered does not provision read nor participates in any pipeline recovery. It will become outdated if its client continues to write or be recovered as a result of lease recovery.

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
ReplicaWaitingToBeRecovered(long blockId, long len, long genStamp, FsVolumeSpi vol, File dir)	Constructor
ReplicaWaitingToBeRecovered(org.apache.hadoop.hdfs.protocol.Block block, FsVolumeSpi vol, File dir)	Constructor
ReplicaWaitingToBeRecovered(ReplicaWaitingToBeRecovered from)	Copy constructor.

Method Summary

Modifier and Type	Method	Description
ReplicaRecoveryInfo	createInfo()
boolean	equals(Object o)
long	getBytesOnDisk()	Get the number of bytes that have written to disk
ReplicaInfo	getOriginalReplica()
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	setRecoveryID(long recoveryId)	Set the recovery id.
String	toString()

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, updateWithReplica

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, setBlockId, setGenerationStamp, setNumBytes, 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 Details

ReplicaWaitingToBeRecovered

public ReplicaWaitingToBeRecovered(long blockId,
 long len,
 long genStamp,
 FsVolumeSpi vol,
 File dir)

Constructor

Parameters:

blockId - block id

len - replica length

genStamp - replica generation stamp

vol - volume where replica is located

dir - directory path where block and meta files are located

ReplicaWaitingToBeRecovered

public ReplicaWaitingToBeRecovered(org.apache.hadoop.hdfs.protocol.Block block,
 FsVolumeSpi vol,
 File dir)

Constructor

Parameters:

block - a block

vol - volume where replica is located

dir - directory path where block and meta files are located

ReplicaWaitingToBeRecovered

public ReplicaWaitingToBeRecovered(ReplicaWaitingToBeRecovered from)

Copy constructor.

Parameters:

from - where to copy from

Method Details

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

equals

public boolean equals(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 String toString()

Overrides:

toString in class ReplicaInfo

getOriginalReplica

public ReplicaInfo getOriginalReplica()

Specified by:

getOriginalReplica in class ReplicaInfo

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

createInfo

public ReplicaRecoveryInfo createInfo()

Specified by:

createInfo in class ReplicaInfo