org.apache.hadoop.hbase.io.hfile

类 HFileDataBlockEncoderImpl

java.lang.Object

org.apache.hadoop.hbase.io.hfile.HFileDataBlockEncoderImpl

所有已实现的接口:

HFileDataBlockEncoder

@InterfaceAudience.Private
public class HFileDataBlockEncoderImpl
extends Object
implements HFileDataBlockEncoder

Do different kinds of data block encoding according to column family options.

字段概要

从接口继承的字段 org.apache.hadoop.hbase.io.hfile.HFileDataBlockEncoder

DATA_BLOCK_ENCODING

构造器概要

构造器

构造器和说明
HFileDataBlockEncoderImpl(DataBlockEncoding encoding) Do data block encoding with specified options.

方法概要

限定符和类型	方法和说明
static HFileDataBlockEncoder	createFromFileInfo(HFile.FileInfo fileInfo)
int	encode(Cell cell, HFileBlockEncodingContext encodingCtx, DataOutputStream out) Encodes a KeyValue.
void	endBlockEncoding(HFileBlockEncodingContext encodingCtx, DataOutputStream out, byte[] uncompressedBytesWithHeader, BlockType blockType) Ends encoding for a block of KeyValues.
DataBlockEncoding	getDataBlockEncoding()
DataBlockEncoding	getEffectiveEncodingInCache(boolean isCompaction)
HFileBlockDecodingContext	newDataBlockDecodingContext(HFileContext fileContext) create a encoder specific decoding context for reading.
HFileBlockEncodingContext	newDataBlockEncodingContext(byte[] dummyHeader, HFileContext fileContext) Create an encoder specific encoding context object for writing.
void	saveMetadata(HFile.Writer writer) Save metadata in HFile which will be written to disk
void	startBlockEncoding(HFileBlockEncodingContext encodingCtx, DataOutputStream out) Starts encoding for a block of KeyValues.
String	toString()
boolean	useEncodedScanner() Decides whether we should use a scanner over encoded blocks.
boolean	useEncodedScanner(boolean isCompaction)

从类继承的方法 java.lang.Object

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

构造器详细资料

HFileDataBlockEncoderImpl

public HFileDataBlockEncoderImpl(DataBlockEncoding encoding)

Do data block encoding with specified options.

参数:

encoding - What kind of data block encoding will be used.

方法详细资料

createFromFileInfo

public static HFileDataBlockEncoder createFromFileInfo(HFile.FileInfo fileInfo)
                                                throws IOException

抛出:

IOException

saveMetadata

public void saveMetadata(HFile.Writer writer)
                  throws IOException

从接口复制的说明: HFileDataBlockEncoder

Save metadata in HFile which will be written to disk

指定者:

saveMetadata 在接口中 HFileDataBlockEncoder

参数:

writer - writer for a given HFile

抛出:

IOException - on disk problems

getDataBlockEncoding

public DataBlockEncoding getDataBlockEncoding()

指定者:

getDataBlockEncoding 在接口中 HFileDataBlockEncoder

返回:

the data block encoding

useEncodedScanner

public boolean useEncodedScanner(boolean isCompaction)

getEffectiveEncodingInCache

public DataBlockEncoding getEffectiveEncodingInCache(boolean isCompaction)

指定者:

getEffectiveEncodingInCache 在接口中 HFileDataBlockEncoder

返回:

the effective in-cache data block encoding, taking into account whether we are doing a compaction.

encode

public int encode(Cell cell,
                  HFileBlockEncodingContext encodingCtx,
                  DataOutputStream out)
           throws IOException

从接口复制的说明: HFileDataBlockEncoder

Encodes a KeyValue.

指定者:

encode 在接口中 HFileDataBlockEncoder

返回:

unencoded kv size

抛出:

IOException

useEncodedScanner

public boolean useEncodedScanner()

从接口复制的说明: HFileDataBlockEncoder

Decides whether we should use a scanner over encoded blocks.

指定者:

useEncodedScanner 在接口中 HFileDataBlockEncoder

返回:

Whether to use encoded scanner.

toString

public String toString()

覆盖:

toString 在类中 Object

newDataBlockEncodingContext

public HFileBlockEncodingContext newDataBlockEncodingContext(byte[] dummyHeader,
                                                             HFileContext fileContext)

从接口复制的说明: HFileDataBlockEncoder

Create an encoder specific encoding context object for writing. And the encoding context should also perform compression if compressionAlgorithm is valid.

指定者:

newDataBlockEncodingContext 在接口中 HFileDataBlockEncoder

参数:

dummyHeader - header bytes

fileContext - HFile meta data

返回:

a new HFileBlockEncodingContext object

newDataBlockDecodingContext

public HFileBlockDecodingContext newDataBlockDecodingContext(HFileContext fileContext)

从接口复制的说明: HFileDataBlockEncoder

create a encoder specific decoding context for reading. And the decoding context should also do decompression if compressionAlgorithm is valid.

指定者:

newDataBlockDecodingContext 在接口中 HFileDataBlockEncoder

参数:

fileContext - - HFile meta data

返回:

a new HFileBlockDecodingContext object

startBlockEncoding

public void startBlockEncoding(HFileBlockEncodingContext encodingCtx,
                               DataOutputStream out)
                        throws IOException

从接口复制的说明: HFileDataBlockEncoder

Starts encoding for a block of KeyValues. Call HFileDataBlockEncoder.endBlockEncoding(HFileBlockEncodingContext, DataOutputStream, byte[], BlockType) to finish encoding of a block.

指定者:

startBlockEncoding 在接口中 HFileDataBlockEncoder

抛出:

IOException

endBlockEncoding

public void endBlockEncoding(HFileBlockEncodingContext encodingCtx,
                             DataOutputStream out,
                             byte[] uncompressedBytesWithHeader,
                             BlockType blockType)
                      throws IOException

从接口复制的说明: HFileDataBlockEncoder

Ends encoding for a block of KeyValues. Gives a chance for the encoder to do the finishing stuff for the encoded block. It must be called at the end of block encoding.

指定者:

endBlockEncoding 在接口中 HFileDataBlockEncoder

抛出:

IOException