org.apache.hadoop.hdfs.server.blockmanagement

Interface BlockCollection

All Known Subinterfaces:

MutableBlockCollection

All Known Implementing Classes:

INodeFile, INodeFileUnderConstruction, INodeFileUnderConstructionWithSnapshot, INodeFileWithSnapshot

@InterfaceAudience.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

Methods

Modifier and Type	Method and Description
ContentSummary	computeContentSummary() Get content summary.
short	getBlockReplication() Get block replication for the collection
BlockInfo[]	getBlocks() Get the blocks.
BlockInfo	getLastBlock() Get the last block of the collection.
String	getName() Get the name of the collection.
long	getPreferredBlockSize() Get preferred block size for the collection
int	numBlocks()

Method Detail

getLastBlock

BlockInfo getLastBlock()
                       throws IOException

Get the last block of the collection.

Throws:

IOException

computeContentSummary

ContentSummary computeContentSummary()

Get content summary.

numBlocks

int numBlocks()

Returns:

the number of blocks

getBlocks

BlockInfo[] getBlocks()

Get the blocks.

getPreferredBlockSize

long getPreferredBlockSize()

Get preferred block size for the collection

Returns:

preferred block size in bytes

getBlockReplication

short getBlockReplication()

Get block replication for the collection

Returns:

block replication value

getName

String getName()

Get the name of the collection.