org.apache.hadoop.hdfs.server.datanode

Class ReplicaBeingWritten

java.lang.Object

org.apache.hadoop.hdfs.protocol.Block

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

org.apache.hadoop.hdfs.server.datanode.ReplicaInPipeline

org.apache.hadoop.hdfs.server.datanode.ReplicaBeingWritten

All Implemented Interfaces:

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

public class ReplicaBeingWritten
extends ReplicaInPipeline

This class represents replicas being written. Those are the replicas that are created in a pipeline initiated by a dfs client.

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, metaOrBlockFilePattern

Constructor Summary

Constructors

Constructor and Description
ReplicaBeingWritten(org.apache.hadoop.hdfs.protocol.Block block, FsVolumeSpi vol, File dir, Thread writer) Constructor
ReplicaBeingWritten(long blockId, long genStamp, FsVolumeSpi vol, File dir, long bytesToReserve) Constructor for a zero length replica
ReplicaBeingWritten(long blockId, long len, long genStamp, FsVolumeSpi vol, File dir, Thread writer, long bytesToReserve) Constructor
ReplicaBeingWritten(ReplicaBeingWritten from) Copy constructor.

Method Summary

Methods

Modifier and Type	Method and Description
boolean	equals(Object o)
HdfsServerConstants.ReplicaState	getState() Get the replica state
long	getVisibleLength() Get the number of bytes that are visible to readers
int	hashCode()

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

attemptToSetWriter, createRestartMetaStream, createStreams, getBytesAcked, getBytesOnDisk, getBytesReserved, getLastChecksumAndDataLen, getOriginalBytesReserved, interruptThread, releaseAllBytesReserved, setBytesAcked, setLastChecksumAndDataLen, stopWriter, toString

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

breakHardLinksIfNeeded, getBlockFile, getFileIoProvider, getMetaFile, getNext, getStorageUuid, getVolume, isOnTransientStorage, parseBaseDir, setDir, 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.ReplicaInPipelineInterface

setNumBytes

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

getBlockId, getGenerationStamp, getNumBytes, getStorageUuid, isOnTransientStorage

Constructor Detail

ReplicaBeingWritten

public ReplicaBeingWritten(long blockId,
                   long genStamp,
                   FsVolumeSpi vol,
                   File dir,
                   long bytesToReserve)

Constructor for a zero length replica

Parameters:

blockId - block id

genStamp - replica generation stamp

vol - volume where replica is located

dir - directory path where block and meta files are located

bytesToReserve - disk space to reserve for this replica, based on the estimated maximum block length.

ReplicaBeingWritten

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

Constructor

Parameters:

block - a block

vol - volume where replica is located

dir - directory path where block and meta files are located

writer - a thread that is writing to this replica

ReplicaBeingWritten

public ReplicaBeingWritten(long blockId,
                   long len,
                   long genStamp,
                   FsVolumeSpi vol,
                   File dir,
                   Thread writer,
                   long bytesToReserve)

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

writer - a thread that is writing to this replica

bytesToReserve - disk space to reserve for this replica, based on the estimated maximum block length.

ReplicaBeingWritten

public ReplicaBeingWritten(ReplicaBeingWritten from)

Copy constructor.

Parameters:

from - where to copy from

Method Detail

getVisibleLength

public long getVisibleLength()

Description copied from interface: org.apache.hadoop.hdfs.server.datanode.Replica

Get the number of bytes that are visible to readers

Specified by:

getVisibleLength in interface org.apache.hadoop.hdfs.server.datanode.Replica

Overrides:

getVisibleLength in class ReplicaInPipeline

Returns:

the number of bytes that are visible to readers

getState

public HdfsServerConstants.ReplicaState getState()

Description copied from interface: org.apache.hadoop.hdfs.server.datanode.Replica

Get the replica state

Specified by:

getState in interface org.apache.hadoop.hdfs.server.datanode.Replica

Overrides:

getState in class ReplicaInPipeline

Returns:

the replica state

equals

public boolean equals(Object o)

Overrides:

equals in class ReplicaInPipeline

hashCode

public int hashCode()

Overrides:

hashCode in class ReplicaInPipeline