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

Class ErasureEncodingStep

java.lang.Object

org.apache.hadoop.io.erasurecode.coder.ErasureEncodingStep

All Implemented Interfaces:

ErasureCodingStep

@Private
public class ErasureEncodingStep
extends java.lang.Object
implements ErasureCodingStep

Erasure encoding step, a wrapper of all the necessary information to perform an encoding step involved in the whole process of encoding a block group.

Constructor Summary

Constructors

Constructor	Description
ErasureEncodingStep(ECBlock[] inputBlocks, ECBlock[] outputBlocks, RawErasureEncoder rawEncoder)	The constructor with all the necessary info.

Method Summary

Modifier and Type	Method	Description
void	finish()	Notify erasure coder that all the chunks of input blocks are processed so the coder can be able to update internal states, considering next step.
ECBlock[]	getInputBlocks()	Input blocks of readable data involved in this step, may be data blocks or parity blocks.
ECBlock[]	getOutputBlocks()	Output blocks of writable buffers involved in this step, may be data blocks or parity blocks.
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 java.lang.Object

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

Constructor Detail

ErasureEncodingStep

public ErasureEncodingStep(ECBlock[] inputBlocks,
                           ECBlock[] outputBlocks,
                           RawErasureEncoder rawEncoder)

The constructor with all the necessary info.

Parameters:

inputBlocks - inputBlocks.

outputBlocks - outputBlocks.

rawEncoder - rawEncoder.

Method Detail

performCoding

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

Description copied from interface: ErasureCodingStep

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

Specified by:

performCoding in interface ErasureCodingStep

Parameters:

inputChunks - inputChunks.

outputChunks - outputChunks.

Throws:

java.io.IOException - raised on errors performing I/O.

getInputBlocks

public ECBlock[] getInputBlocks()

Description copied from interface: ErasureCodingStep

Input blocks of readable data involved in this step, may be data blocks or parity blocks.

Specified by:

getInputBlocks in interface ErasureCodingStep

Returns:

input blocks

getOutputBlocks

public ECBlock[] getOutputBlocks()

Description copied from interface: ErasureCodingStep

Output blocks of writable buffers involved in this step, may be data blocks or parity blocks.

Specified by:

getOutputBlocks in interface ErasureCodingStep

Returns:

output blocks

finish

public void finish()

Description copied from interface: ErasureCodingStep

Notify erasure coder that all the chunks of input blocks are processed so the coder can be able to update internal states, considering next step.

Specified by:

finish in interface ErasureCodingStep