Package org.apache.hadoop.hdfs.util

Class StripedBlockUtil.AlignedStripe

java.lang.Object

org.apache.hadoop.hdfs.util.StripedBlockUtil.AlignedStripe

Enclosing class:

StripedBlockUtil

public static class StripedBlockUtil.AlignedStripe
extends Object

Given a requested byte range on a striped block group, an AlignedStripe represents an inclusive StripedBlockUtil.VerticalRange that is aligned with both the byte range and boundaries of all internal blocks. As illustrated in the diagram, any given byte range on a block group leads to 1~5 AlignedStripe's. An AlignedStripe is the basic unit of reading from a striped block group, because within the AlignedStripe, all internal blocks can be processed in a uniform manner. The coverage of an AlignedStripe on an internal block is represented as a StripedBlockUtil.StripingChunk. To simplify the logic of reading a logical byte range from a block group, a StripingChunk is either completely in the requested byte range or completely outside the requested byte range.

Field Summary

Fields

Modifier and Type	Field	Description
final StripedBlockUtil.StripingChunk[]	chunks	status of each chunk in the stripe.
int	fetchedChunksNum
int	missingChunksNum
StripedBlockUtil.VerticalRange	range

Constructor Summary

Constructors

Constructor	Description
AlignedStripe(long offsetInBlock, long length, int width)

Method Summary

Modifier and Type	Method	Description
long	getOffsetInBlock()
long	getSpanInBlock()
boolean	include(long pos)
String	toString()

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, wait, wait, wait

Field Details

range

public StripedBlockUtil.VerticalRange range

chunks

public final StripedBlockUtil.StripingChunk[] chunks

status of each chunk in the stripe.

fetchedChunksNum

public int fetchedChunksNum

missingChunksNum

public int missingChunksNum

Constructor Details

AlignedStripe

public AlignedStripe(long offsetInBlock,
 long length,
 int width)

Method Details

include

public boolean include(long pos)

getOffsetInBlock

public long getOffsetInBlock()

getSpanInBlock

public long getSpanInBlock()

toString

public String toString()

Overrides:

toString in class Object