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

Class RSErasureEncoder

java.lang.Object

org.apache.hadoop.conf.Configured

org.apache.hadoop.io.erasurecode.coder.ErasureEncoder

org.apache.hadoop.io.erasurecode.coder.RSErasureEncoder

All Implemented Interfaces:

Configurable, ErasureCoder

@Private
public class RSErasureEncoder
extends ErasureEncoder

Reed-Solomon erasure encoder that encodes a block group. It implements ErasureCoder.

Constructor Summary

Constructors

Constructor	Description
RSErasureEncoder(ErasureCoderOptions options)

Method Summary

Modifier and Type	Method	Description
boolean	preferDirectBuffer()	Tell if direct or off-heap buffer is preferred or not.
protected ErasureCodingStep	prepareEncodingStep(ECBlockGroup blockGroup)	Perform encoding against a block group.
void	release()	Release the resources if any.

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

calculateCoding, getInputBlocks, getNumDataUnits, getNumParityUnits, getOptions, getOutputBlocks

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 Details

RSErasureEncoder

public RSErasureEncoder(ErasureCoderOptions options)

Method Details

prepareEncodingStep

protected ErasureCodingStep prepareEncodingStep(ECBlockGroup blockGroup)

Description copied from class: ErasureEncoder

Perform encoding against a block group.

Specified by:

prepareEncodingStep in class ErasureEncoder

Parameters:

blockGroup - blockGroup.

Returns:

encoding step for caller to do the real work

release

public void release()

Description copied from interface: ErasureCoder

Release the resources if any. Good chance to invoke RawErasureCoder#release.

Specified by:

release in interface ErasureCoder

Overrides:

release in class ErasureEncoder

preferDirectBuffer

public boolean preferDirectBuffer()

Description copied from interface: ErasureCoder

Tell if direct or off-heap buffer is preferred or not. It's for callers to decide how to allocate coding chunk buffers, either on heap or off heap. It will return false by default.

Specified by:

preferDirectBuffer in interface ErasureCoder

Overrides:

preferDirectBuffer in class ErasureEncoder

Returns:

true if direct buffer is preferred for performance consideration, otherwise false.