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

Class DummyErasureDecoder

java.lang.Object

org.apache.hadoop.conf.Configured

org.apache.hadoop.io.erasurecode.coder.ErasureDecoder

org.apache.hadoop.io.erasurecode.coder.DummyErasureDecoder

All Implemented Interfaces:

Configurable, ErasureCoder

public class DummyErasureDecoder
extends ErasureDecoder

Dummy erasure decoder does no real computation. Instead, it just returns zero bytes. This decoder can be used to isolate the performance issue to HDFS side logic instead of codec, and is intended for test only.

Constructor Summary

Constructors

Constructor	Description
DummyErasureDecoder(ErasureCoderOptions options)

Method Summary

Modifier and Type	Method	Description
protected ErasureCodingStep	prepareDecodingStep(ECBlockGroup blockGroup)	Perform decoding against a block blockGroup.

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

calculateCoding, getErasedIndexes, getInputBlocks, getNumDataUnits, getNumErasedBlocks, getNumErasedBlocks, getNumParityUnits, getOptions, getOutputBlocks, preferDirectBuffer, release

Methods inherited from class org.apache.hadoop.conf.Configured

getConf, setConf

Methods inherited from class java.lang.Object

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

Methods inherited from interface org.apache.hadoop.conf.Configurable

getConf, setConf

Constructor Detail

DummyErasureDecoder

public DummyErasureDecoder(ErasureCoderOptions options)

Method Detail

prepareDecodingStep

protected ErasureCodingStep prepareDecodingStep(ECBlockGroup blockGroup)

Description copied from class: ErasureDecoder

Perform decoding against a block blockGroup.

Specified by:

prepareDecodingStep in class ErasureDecoder

Parameters:

blockGroup - blockGroup.

Returns:

decoding step for caller to do the real work