org.apache.hadoop.hbase.io.encoding

Class HFileBlockDefaultEncodingContext

java.lang.Object

org.apache.hadoop.hbase.io.encoding.HFileBlockDefaultEncodingContext

All Implemented Interfaces:

HFileBlockEncodingContext

@InterfaceAudience.Private
public class HFileBlockDefaultEncodingContext
extends Object
implements HFileBlockEncodingContext

A default implementation of HFileBlockEncodingContext. It will compress the data section as one continuous buffer.

See Also:

for the decompression part

Field Summary

Fields

Modifier and Type	Field and Description
private BlockType	blockType
private ByteArrayOutputStream	compressedByteStream Underlying stream to write compressed bytes to
private org.apache.hadoop.io.compress.CompressionOutputStream	compressionStream Compression output stream
private org.apache.hadoop.io.compress.Compressor	compressor Compressor, which is also reused between consecutive blocks.
private ByteArrayOutputStream	cryptoByteStream Underlying stream to write encrypted bytes to
private byte[]	dummyHeader
private EncodingState	encoderState
private DataBlockEncoding	encodingAlgo
private HFileContext	fileContext
private byte[]	iv Initialization vector
private TagCompressionContext	tagCompressionContext

Constructor Summary

Constructors

Constructor and Description
HFileBlockDefaultEncodingContext(DataBlockEncoding encoding, byte[] headerBytes, HFileContext fileContext)

Method Summary

Modifier and Type	Method and Description
void	close() Releases the compressor this writer uses to compress blocks into the compressor pool.
private Bytes	compressAfterEncoding(byte[] uncompressedBytesWithHeaderBuffer, int uncompressedBytesWithHeaderOffset, int uncompressedBytesWithHeaderLength, byte[] headerBytes)
Bytes	compressAndEncrypt(byte[] data, int offset, int length)
BlockType	getBlockType()
DataBlockEncoding	getDataBlockEncoding()
EncodingState	getEncodingState()
HFileContext	getHFileContext()
TagCompressionContext	getTagCompressionContext()
void	postEncoding(BlockType blockType) Do any action that needs to be performed after the encoding.
void	prepareEncoding(DataOutputStream out) prepare to start a new encoding.
void	setEncodingState(EncodingState state) Sets the encoding state.
void	setTagCompressionContext(TagCompressionContext tagCompressionContext)

Methods inherited from class java.lang.Object

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

Field Detail

blockType

private BlockType blockType

encodingAlgo

private final DataBlockEncoding encodingAlgo

dummyHeader

private byte[] dummyHeader

compressor

private org.apache.hadoop.io.compress.Compressor compressor

Compressor, which is also reused between consecutive blocks.

compressionStream

private org.apache.hadoop.io.compress.CompressionOutputStream compressionStream

Compression output stream

compressedByteStream

private ByteArrayOutputStream compressedByteStream

Underlying stream to write compressed bytes to

fileContext

private HFileContext fileContext

tagCompressionContext

private TagCompressionContext tagCompressionContext

cryptoByteStream

private ByteArrayOutputStream cryptoByteStream

Underlying stream to write encrypted bytes to

iv

private byte[] iv

Initialization vector

encoderState

private EncodingState encoderState

Constructor Detail

HFileBlockDefaultEncodingContext

public HFileBlockDefaultEncodingContext(DataBlockEncoding encoding,
                                        byte[] headerBytes,
                                        HFileContext fileContext)

Parameters:

encoding - encoding used

headerBytes - dummy header bytes

fileContext - HFile meta data

Method Detail

prepareEncoding

public void prepareEncoding(DataOutputStream out)
                     throws IOException

prepare to start a new encoding.

Throws:

IOException

postEncoding

public void postEncoding(BlockType blockType)
                  throws IOException

Description copied from interface: HFileBlockEncodingContext

Do any action that needs to be performed after the encoding. Compression is also included if a non-null compression algorithm is used

Specified by:

postEncoding in interface HFileBlockEncodingContext

Throws:

IOException

compressAndEncrypt

public Bytes compressAndEncrypt(byte[] data,
                                int offset,
                                int length)
                         throws IOException

Specified by:

compressAndEncrypt in interface HFileBlockEncodingContext

Parameters:

data - encoded bytes with header

offset - the offset in encoded data to start at

length - the number of encoded bytes

Returns:

Bytes with header which are ready to write out to disk. This is compressed and encrypted bytes applying the set compression algorithm and encryption. The bytes may be changed. If need a Bytes reference for later use, clone the bytes and use that. Null if the data doesn't need to be compressed and encrypted.

Throws:

IOException

compressAfterEncoding

private Bytes compressAfterEncoding(byte[] uncompressedBytesWithHeaderBuffer,
                                    int uncompressedBytesWithHeaderOffset,
                                    int uncompressedBytesWithHeaderLength,
                                    byte[] headerBytes)
                             throws IOException

Throws:

IOException

getBlockType

public BlockType getBlockType()

Specified by:

getBlockType in interface HFileBlockEncodingContext

Returns:

the block type after encoding

close

public void close()

Releases the compressor this writer uses to compress blocks into the compressor pool.

Specified by:

close in interface HFileBlockEncodingContext

getDataBlockEncoding

public DataBlockEncoding getDataBlockEncoding()

Specified by:

getDataBlockEncoding in interface HFileBlockEncodingContext

Returns:

the DataBlockEncoding encoding used

getHFileContext

public HFileContext getHFileContext()

Specified by:

getHFileContext in interface HFileBlockEncodingContext

Returns:

HFile context information

getTagCompressionContext

public TagCompressionContext getTagCompressionContext()

setTagCompressionContext

public void setTagCompressionContext(TagCompressionContext tagCompressionContext)

getEncodingState

public EncodingState getEncodingState()

Specified by:

getEncodingState in interface HFileBlockEncodingContext

Returns:

the encoding state

setEncodingState

public void setEncodingState(EncodingState state)

Description copied from interface: HFileBlockEncodingContext

Sets the encoding state.

Specified by:

setEncodingState in interface HFileBlockEncodingContext