Package org.apache.hadoop.hdfs.server.datanode.erasurecode

Class StripedBlockChecksumReconstructor

java.lang.Object

org.apache.hadoop.hdfs.server.datanode.erasurecode.StripedBlockChecksumReconstructor

All Implemented Interfaces:

java.io.Closeable, java.lang.AutoCloseable

Direct Known Subclasses:

StripedBlockChecksumCompositeCrcReconstructor, StripedBlockChecksumMd5CrcReconstructor

@Private
public abstract class StripedBlockChecksumReconstructor
extends java.lang.Object
implements java.io.Closeable

StripedBlockChecksumReconstructor reconstruct one or more missed striped block in the striped block group, the minimum number of live striped blocks should be no less than data block number. Then checksum will be recalculated using the newly reconstructed block.

Field Summary

Fields

Modifier and Type	Field	Description
protected static org.slf4j.Logger	LOG

Constructor Summary

Constructors

Modifier	Constructor	Description
protected	StripedBlockChecksumReconstructor(ErasureCodingWorker worker, StripedReconstructionInfo stripedReconInfo, org.apache.hadoop.io.DataOutputBuffer checksumWriter, long requestedBlockLength)

Method Summary

Modifier and Type	Method	Description
void	close()
long	getBytesRead()
long	getBytesWritten()
org.apache.hadoop.util.DataChecksum	getChecksum()
long	getChecksumDataLen()
protected org.apache.hadoop.io.DataOutputBuffer	getChecksumWriter()
abstract java.lang.Object	getDigestObject()	Should return a representation of a completed/reconstructed digest which is suitable for debug printing.
ErasureCodingWorker	getErasureCodingWorker()
long	getRemoteBytesRead()
void	incrBytesRead(boolean local, long delta)
void	incrBytesWritten(long delta)
protected void	initDecoderIfNecessary()
protected void	initDecodingValidatorIfNecessary()
protected static void	markBuffers(java.nio.ByteBuffer[] buffers)
void	reconstruct()
protected static void	resetBuffers(java.nio.ByteBuffer[] buffers)

Methods inherited from class java.lang.Object

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

Field Detail

LOG

protected static final org.slf4j.Logger LOG

Constructor Detail

StripedBlockChecksumReconstructor

protected StripedBlockChecksumReconstructor(ErasureCodingWorker worker,
                                            StripedReconstructionInfo stripedReconInfo,
                                            org.apache.hadoop.io.DataOutputBuffer checksumWriter,
                                            long requestedBlockLength)
                                     throws java.io.IOException

Throws:

java.io.IOException

Method Detail

reconstruct

public void reconstruct()
                 throws java.io.IOException

Throws:

java.io.IOException

getDigestObject

public abstract java.lang.Object getDigestObject()

Should return a representation of a completed/reconstructed digest which is suitable for debug printing.

getChecksumWriter

protected org.apache.hadoop.io.DataOutputBuffer getChecksumWriter()

getChecksumDataLen

public long getChecksumDataLen()

close

public void close()
           throws java.io.IOException

Specified by:

close in interface java.lang.AutoCloseable

Specified by:

close in interface java.io.Closeable

Throws:

java.io.IOException

incrBytesRead

public void incrBytesRead(boolean local,
                          long delta)

incrBytesWritten

public void incrBytesWritten(long delta)

getBytesRead

public long getBytesRead()

getRemoteBytesRead

public long getRemoteBytesRead()

getBytesWritten

public long getBytesWritten()

initDecoderIfNecessary

protected void initDecoderIfNecessary()

initDecodingValidatorIfNecessary

protected void initDecodingValidatorIfNecessary()

getChecksum

public org.apache.hadoop.util.DataChecksum getChecksum()

getErasureCodingWorker

public ErasureCodingWorker getErasureCodingWorker()

markBuffers

protected static void markBuffers(java.nio.ByteBuffer[] buffers)

resetBuffers

protected static void resetBuffers(java.nio.ByteBuffer[] buffers)