Package org.apache.hadoop.hdfs.util

Class StripedBlockUtil.StripingChunk

java.lang.Object

org.apache.hadoop.hdfs.util.StripedBlockUtil.StripingChunk

Enclosing class:

StripedBlockUtil

public static class StripedBlockUtil.StripingChunk
extends java.lang.Object

Indicates the coverage of an StripedBlockUtil.AlignedStripe on an internal block, and the state of the chunk in the context of the read request.

Field Summary

Fields

Modifier and Type	Field	Description
static int	ALLZERO	Internal block is short and has no overlap with chunk.
static int	FETCHED	Chunk has been successfully fetched
static int	MISSING	Chunk has encountered failed when being fetched
static int	PENDING	Chunk being fetched (fetching task is in-flight)
static int	REQUESTED	Chunk is requested either by application or for decoding, need to schedule read task
int	state	If a chunk is completely in requested range, the state transition is: REQUESTED (when AlignedStripe created) -> PENDING -> {FETCHED | MISSING} If a chunk is completely outside requested range (including parity chunks), state transition is: null (AlignedStripe created) ->REQUESTED (upon failure) -> PENDING ...

Constructor Summary

Constructors

Constructor	Description
StripingChunk()
StripingChunk(int state)
StripingChunk(java.nio.ByteBuffer buf)

Method Summary

Modifier and Type	Method	Description
java.nio.ByteBuffer	getByteBuffer()
StripedBlockUtil.ChunkByteBuffer	getChunkBuffer()
boolean	useByteBuffer()
boolean	useChunkBuffer()

Methods inherited from class java.lang.Object

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

Field Detail

FETCHED

public static final int FETCHED

Chunk has been successfully fetched

See Also:

Constant Field Values

MISSING

public static final int MISSING

Chunk has encountered failed when being fetched

See Also:

Constant Field Values

PENDING

public static final int PENDING

Chunk being fetched (fetching task is in-flight)

See Also:

Constant Field Values

REQUESTED

public static final int REQUESTED

Chunk is requested either by application or for decoding, need to schedule read task

See Also:

Constant Field Values

ALLZERO

public static final int ALLZERO

Internal block is short and has no overlap with chunk. Chunk considered all-zero bytes in codec calculations.

See Also:

Constant Field Values

state

public int state

If a chunk is completely in requested range, the state transition is: REQUESTED (when AlignedStripe created) -> PENDING -> {FETCHED | MISSING} If a chunk is completely outside requested range (including parity chunks), state transition is: null (AlignedStripe created) ->REQUESTED (upon failure) -> PENDING ...

Constructor Detail

StripingChunk

public StripingChunk()

StripingChunk

public StripingChunk(java.nio.ByteBuffer buf)

StripingChunk

public StripingChunk(int state)

Method Detail

useByteBuffer

public boolean useByteBuffer()

useChunkBuffer

public boolean useChunkBuffer()

getByteBuffer

public java.nio.ByteBuffer getByteBuffer()

getChunkBuffer

public StripedBlockUtil.ChunkByteBuffer getChunkBuffer()