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

Interface Replica

All Known Subinterfaces:

ReplicaInPipeline

All Known Implementing Classes:

BlockListAsLongs.BlockReportReplica, FinalizedProvidedReplica, FinalizedReplica, LocalReplica, LocalReplicaInPipeline, ProvidedReplica, ReplicaBeingWritten, ReplicaInfo, ReplicaUnderRecovery, ReplicaWaitingToBeRecovered

@Private
public interface Replica

This represents block replicas which are stored in DataNode.

Method Summary

Modifier and Type	Method	Description
long	getBlockId()	Get the block ID
long	getBytesOnDisk()	Get the number of bytes that have written to disk
long	getGenerationStamp()	Get the generation stamp
long	getNumBytes()	Get the number of bytes received
HdfsServerConstants.ReplicaState	getState()	Get the replica state
java.lang.String	getStorageUuid()	Return the storageUuid of the volume that stores this replica.
long	getVisibleLength()	Get the number of bytes that are visible to readers
FsVolumeSpi	getVolume()	Get the volume of replica.
boolean	isOnTransientStorage()	Return true if the target volume is backed by RAM.

Method Detail

getBlockId

long getBlockId()

Get the block ID

getGenerationStamp

long getGenerationStamp()

Get the generation stamp

getState

HdfsServerConstants.ReplicaState getState()

Get the replica state

Returns:

the replica state

getNumBytes

long getNumBytes()

Get the number of bytes received

Returns:

the number of bytes that have been received

getBytesOnDisk

long getBytesOnDisk()

Get the number of bytes that have written to disk

Returns:

the number of bytes that have written to disk

getVisibleLength

long getVisibleLength()

Get the number of bytes that are visible to readers

Returns:

the number of bytes that are visible to readers

getStorageUuid

java.lang.String getStorageUuid()

Return the storageUuid of the volume that stores this replica.

isOnTransientStorage

boolean isOnTransientStorage()

Return true if the target volume is backed by RAM.

getVolume

FsVolumeSpi getVolume()

Get the volume of replica.

Returns:

the volume of replica