Package org.apache.hadoop.io.erasurecode.coder

Class HHXORErasureDecodingStep

java.lang.Object

org.apache.hadoop.io.erasurecode.coder.HHErasureCodingStep

org.apache.hadoop.io.erasurecode.coder.HHXORErasureDecodingStep

All Implemented Interfaces:

ErasureCodingStep

@Private
public class HHXORErasureDecodingStep
extends HHErasureCodingStep

Hitchhiker-XOR Erasure decoding step, a wrapper of all the necessary information to perform a decoding step involved in the whole process of decoding a block group.

Constructor Summary

Constructors

Constructor	Description
HHXORErasureDecodingStep(ECBlock[] inputBlocks, int[] erasedIndexes, ECBlock[] outputBlocks, RawErasureDecoder rawDecoder, RawErasureEncoder rawEncoder)	The constructor with all the necessary info.

Method Summary

Modifier and Type	Method	Description
void	performCoding(ECChunk[] inputChunks, ECChunk[] outputChunks)	Perform encoding or decoding given the input chunks, and generated results will be written to the output chunks.

Methods inherited from class org.apache.hadoop.io.erasurecode.coder.HHErasureCodingStep

finish, getInputBlocks, getOutputBlocks, getSubPacketSize

Methods inherited from class java.lang.Object

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

Constructor Details

HHXORErasureDecodingStep

public HHXORErasureDecodingStep(ECBlock[] inputBlocks,
 int[] erasedIndexes,
 ECBlock[] outputBlocks,
 RawErasureDecoder rawDecoder,
 RawErasureEncoder rawEncoder)

The constructor with all the necessary info.

Parameters:

inputBlocks - inputBlocks.

erasedIndexes - the indexes of erased blocks in inputBlocks array

outputBlocks - outputBlocks.

rawDecoder - underlying RS decoder for hitchhiker decoding

rawEncoder - underlying XOR encoder for hitchhiker decoding

Method Details

performCoding

public void performCoding(ECChunk[] inputChunks,
 ECChunk[] outputChunks)
                   throws IOException

Description copied from interface: ErasureCodingStep

Perform encoding or decoding given the input chunks, and generated results will be written to the output chunks.

Parameters:

inputChunks - inputChunks.

outputChunks - outputChunks.

Throws:

IOException - raised on errors performing I/O.