org.apache.hadoop.hdfs.server.blockmanagement

Class BlockInfoUnderConstruction

java.lang.Object

org.apache.hadoop.hdfs.protocol.Block

org.apache.hadoop.hdfs.server.blockmanagement.BlockInfo

org.apache.hadoop.hdfs.server.blockmanagement.BlockInfoUnderConstruction

All Implemented Interfaces:

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

public class BlockInfoUnderConstruction
extends BlockInfo

Represents a block that is currently being constructed.
This is usually the last block of a file opened for write or append.

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
BlockInfoUnderConstruction(org.apache.hadoop.hdfs.protocol.Block blk, int replication) Create block and set its state to HdfsServerConstants.BlockUCState.UNDER_CONSTRUCTION.
BlockInfoUnderConstruction(org.apache.hadoop.hdfs.protocol.Block blk, int replication, HdfsServerConstants.BlockUCState state, org.apache.hadoop.hdfs.server.blockmanagement.DatanodeDescriptor[] targets) Create a block that is currently being constructed.

Method Summary

Methods

Modifier and Type	Method and Description
boolean	equals(Object obj)
long	getBlockRecoveryId() Get block recovery ID
HdfsServerConstants.BlockUCState	getBlockUCState() Return the state of the block under construction.
org.apache.hadoop.hdfs.server.blockmanagement.DatanodeDescriptor[]	getExpectedLocations() Create array of expected replica locations (as has been assigned by chooseTargets()).
int	getNumExpectedLocations() Get the number of expected locations
int	hashCode()
void	initializeBlockRecovery(long recoveryId) Initialize lease recovery for this block.
void	setExpectedLocations(org.apache.hadoop.hdfs.server.blockmanagement.DatanodeDescriptor[] targets) Set expected locations
void	setGenerationStampAndVerifyReplicas(long genStamp) Process the recorded replicas.
String	toString()

Methods inherited from class org.apache.hadoop.hdfs.server.blockmanagement.BlockInfo

addNode, convertToBlockUnderConstruction, getINode, getNext, isComplete, listInsert, listRemove, moveBlockToHead, removeNode, setINode, setNext

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

compareTo, filename2id, getBlockId, getBlockId, getBlockName, getGenerationStamp, getGenerationStamp, getNumBytes, isBlockFilename, isMetaFilename, readFields, readId, set, setBlockId, setGenerationStamp, setNumBytes, write, writeId

Methods inherited from class java.lang.Object

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

Constructor Detail

BlockInfoUnderConstruction

public BlockInfoUnderConstruction(org.apache.hadoop.hdfs.protocol.Block blk,
                          int replication)

Create block and set its state to HdfsServerConstants.BlockUCState.UNDER_CONSTRUCTION.

BlockInfoUnderConstruction

public BlockInfoUnderConstruction(org.apache.hadoop.hdfs.protocol.Block blk,
                          int replication,
                          HdfsServerConstants.BlockUCState state,
                          org.apache.hadoop.hdfs.server.blockmanagement.DatanodeDescriptor[] targets)

Create a block that is currently being constructed.

Method Detail

setExpectedLocations

public void setExpectedLocations(org.apache.hadoop.hdfs.server.blockmanagement.DatanodeDescriptor[] targets)

Set expected locations

getExpectedLocations

public org.apache.hadoop.hdfs.server.blockmanagement.DatanodeDescriptor[] getExpectedLocations()

Create array of expected replica locations (as has been assigned by chooseTargets()).

getNumExpectedLocations

public int getNumExpectedLocations()

Get the number of expected locations

getBlockUCState

public HdfsServerConstants.BlockUCState getBlockUCState()

Return the state of the block under construction.

Overrides:

getBlockUCState in class BlockInfo

Returns:

HdfsServerConstants.BlockUCState.COMPLETE

See Also:

HdfsServerConstants.BlockUCState

getBlockRecoveryId

public long getBlockRecoveryId()

Get block recovery ID

setGenerationStampAndVerifyReplicas

public void setGenerationStampAndVerifyReplicas(long genStamp)

Process the recorded replicas. When about to commit or finish the pipeline recovery sort out bad replicas.

Parameters:

genStamp - The final generation stamp for the block.

initializeBlockRecovery

public void initializeBlockRecovery(long recoveryId)

Initialize lease recovery for this block. Find the first alive data-node starting from the previous primary and make it primary.

hashCode

public int hashCode()

Overrides:

hashCode in class BlockInfo

equals

public boolean equals(Object obj)

Overrides:

equals in class BlockInfo

toString

public String toString()

Overrides:

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