Package org.apache.hadoop.io.erasurecode.rawcoder

Class XORRawDecoder

java.lang.Object

org.apache.hadoop.io.erasurecode.rawcoder.RawErasureDecoder

org.apache.hadoop.io.erasurecode.rawcoder.XORRawDecoder

@Private
public class XORRawDecoder
extends RawErasureDecoder

A raw decoder in XOR code scheme in pure Java, adapted from HDFS-RAID. XOR code is an important primitive code scheme in erasure coding and often used in advanced codes, like HitchHiker and LRC, though itself is rarely deployed independently.

Constructor Summary

Constructors

Constructor	Description
XORRawDecoder(ErasureCoderOptions coderOptions)

Method Summary

Modifier and Type	Method	Description
protected void	doDecode(org.apache.hadoop.io.erasurecode.rawcoder.ByteArrayDecodingState decodingState)	Perform the real decoding using bytes array, supporting offsets and lengths.
protected void	doDecode(org.apache.hadoop.io.erasurecode.rawcoder.ByteBufferDecodingState decodingState)	Perform the real decoding using Direct ByteBuffer.

Methods inherited from class org.apache.hadoop.io.erasurecode.rawcoder.RawErasureDecoder

allowChangeInputs, allowVerboseDump, decode, decode, decode, getNumAllUnits, getNumDataUnits, getNumParityUnits, preferDirectBuffer, release

Methods inherited from class java.lang.Object

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

Constructor Details

XORRawDecoder

public XORRawDecoder(ErasureCoderOptions coderOptions)

Method Details

doDecode

protected void doDecode(org.apache.hadoop.io.erasurecode.rawcoder.ByteBufferDecodingState decodingState)

Description copied from class: RawErasureDecoder

Perform the real decoding using Direct ByteBuffer.

Specified by:

doDecode in class RawErasureDecoder

Parameters:

decodingState - the decoding state

doDecode

protected void doDecode(org.apache.hadoop.io.erasurecode.rawcoder.ByteArrayDecodingState decodingState)

Description copied from class: RawErasureDecoder

Perform the real decoding using bytes array, supporting offsets and lengths.

Specified by:

doDecode in class RawErasureDecoder

Parameters:

decodingState - the decoding state