Package org.apache.hadoop.hdfs.server.blockmanagement

Interface BlockCollection

All Known Implementing Classes:

INodeFile

@Private
public interface BlockCollection

This interface is used by the block manager to expose a few characteristics of a collection of Block/BlockUnderConstruction.

Method Summary

Modifier and Type	Method	Description
org.apache.hadoop.fs.ContentSummary	computeContentSummary(BlockStoragePolicySuite bsps)	Get content summary.
void	convertLastBlockToUC(BlockInfo lastBlock, DatanodeStorageInfo[] targets)	Convert the last block of the collection to an under-construction block and set the locations.
BlockInfo[]	getBlocks()	Get the blocks (striped or contiguous).
long	getId()
BlockInfo	getLastBlock()	Get the last block of the collection.
java.lang.String	getName()	Get the name of the collection.
short	getPreferredBlockReplication()	Get block replication for the collection.
long	getPreferredBlockSize()	Get preferred block size for the collection
byte	getStoragePolicyID()
boolean	isStriped()
boolean	isUnderConstruction()
int	numBlocks()
void	setBlock(int index, BlockInfo blk)	Set the block (contiguous or striped) at the given index.

Method Detail

getLastBlock

BlockInfo getLastBlock()

Get the last block of the collection.

computeContentSummary

org.apache.hadoop.fs.ContentSummary computeContentSummary(BlockStoragePolicySuite bsps)
                                                   throws org.apache.hadoop.security.AccessControlException

Get content summary.

Throws:

org.apache.hadoop.security.AccessControlException

numBlocks

int numBlocks()

Returns:

the number of blocks or block groups

getBlocks

BlockInfo[] getBlocks()

Get the blocks (striped or contiguous).

getPreferredBlockSize

long getPreferredBlockSize()

Get preferred block size for the collection

Returns:

preferred block size in bytes

getPreferredBlockReplication

short getPreferredBlockReplication()

Get block replication for the collection.

Returns:

block replication value. Return 0 if the file is erasure coded.

getStoragePolicyID

byte getStoragePolicyID()

Returns:

the storage policy ID.

getName

java.lang.String getName()

Get the name of the collection.

setBlock

void setBlock(int index,
              BlockInfo blk)

Set the block (contiguous or striped) at the given index.

convertLastBlockToUC

void convertLastBlockToUC(BlockInfo lastBlock,
                          DatanodeStorageInfo[] targets)
                   throws java.io.IOException

Convert the last block of the collection to an under-construction block and set the locations.

Throws:

java.io.IOException

isUnderConstruction

boolean isUnderConstruction()

Returns:

whether the block collection is under construction.

isStriped

boolean isStriped()

Returns:

whether the block collection is in striping format

getId

long getId()

Returns:

the id for the block collection