org.apache.hadoop.hbase.io.hfile

类 NoOpDataBlockEncoder

java.lang.Object

org.apache.hadoop.hbase.io.hfile.NoOpDataBlockEncoder

所有已实现的接口:

HFileDataBlockEncoder

@InterfaceAudience.Private
public class NoOpDataBlockEncoder
extends Object
implements HFileDataBlockEncoder

Does not perform any kind of encoding/decoding.

字段概要

字段

限定符和类型	字段和说明
static NoOpDataBlockEncoder	INSTANCE

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

DATA_BLOCK_ENCODING

方法概要

限定符和类型	方法和说明
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 meta) create a encoder specific decoding context for reading.
HFileBlockEncodingContext	newDataBlockEncodingContext(byte[] dummyHeader, HFileContext meta) 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 blkEncodingCtx, DataOutputStream out) Starts encoding for a block of KeyValues.
String	toString()
boolean	useEncodedScanner() Decides whether we should use a scanner over encoded blocks.

从类继承的方法 java.lang.Object

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

字段详细资料

INSTANCE

public static final NoOpDataBlockEncoder INSTANCE

方法详细资料

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.

saveMetadata

public void saveMetadata(HFile.Writer writer)

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

getDataBlockEncoding

public DataBlockEncoding getDataBlockEncoding()

指定者:

getDataBlockEncoding 在接口中 HFileDataBlockEncoder

返回:

the data block encoding

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.

toString

public String toString()

覆盖:

toString 在类中 Object

newDataBlockEncodingContext

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

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

meta - HFile meta data

返回:

a new HFileBlockEncodingContext object

newDataBlockDecodingContext

public HFileBlockDecodingContext newDataBlockDecodingContext(HFileContext meta)

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:

meta - - HFile meta data

返回:

a new HFileBlockDecodingContext object

startBlockEncoding

public void startBlockEncoding(HFileBlockEncodingContext blkEncodingCtx,
                               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