org.apache.hadoop.hbase.regionserver.wal

类 WALCellCodec

java.lang.Object

org.apache.hadoop.hbase.regionserver.wal.WALCellCodec

所有已实现的接口:

Codec

直接已知子类:

SecureWALCellCodec

@InterfaceAudience.LimitedPrivate(value={"Coprocesssor","Phoenix","Configuration"})
public class WALCellCodec
extends Object
implements Codec

Compression in this class is lifted off Compressor/KeyValueCompression. This is a pure coincidence... they are independent and don't have to be compatible. This codec is used at server side for writing cells to WAL as well as for sending edits as part of the distributed splitting process.

嵌套类概要

嵌套类

限定符和类型	类和说明
static interface	WALCellCodec.ByteStringCompressor
static interface	WALCellCodec.ByteStringUncompressor
static class	WALCellCodec.EnsureKvEncoder

从接口继承的嵌套类/接口 org.apache.hadoop.hbase.codec.Codec

Codec.Decoder, Codec.Encoder

字段概要

字段

限定符和类型	字段和说明
protected CompressionContext	compression
static String	WAL_CELL_CODEC_CLASS_KEY Configuration key for the class to use when encoding cells in the WAL

构造器概要

构造器

构造器和说明
WALCellCodec() All subclasses must implement a no argument constructor
WALCellCodec(org.apache.hadoop.conf.Configuration conf, CompressionContext compression) Default constructor - all subclasses must implement a constructor with this signature if they are to be dynamically loaded from the Configuration.

方法概要

限定符和类型	方法和说明
static WALCellCodec	create(org.apache.hadoop.conf.Configuration conf, CompressionContext compression) Create and setup a WALCellCodec from the CompressionContext.
static WALCellCodec	create(org.apache.hadoop.conf.Configuration conf, String cellCodecClsName, CompressionContext compression) Create and setup a WALCellCodec from the cellCodecClsName and CompressionContext, if cellCodecClsName is specified.
WALCellCodec.ByteStringCompressor	getByteStringCompressor()
WALCellCodec.ByteStringUncompressor	getByteStringUncompressor()
Codec.Decoder	getDecoder(ByteBuff buf)
Codec.Decoder	getDecoder(InputStream is)
Codec.Encoder	getEncoder(OutputStream os)
static WALCellCodec.ByteStringCompressor	getNoneCompressor()
static WALCellCodec.ByteStringUncompressor	getNoneUncompressor()
static Class<?>	getWALCellCodecClass(org.apache.hadoop.conf.Configuration conf)

从类继承的方法 java.lang.Object

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

字段详细资料

WAL_CELL_CODEC_CLASS_KEY

public static final String WAL_CELL_CODEC_CLASS_KEY

Configuration key for the class to use when encoding cells in the WAL

另请参阅:

常量字段值

compression

protected final CompressionContext compression

构造器详细资料

WALCellCodec

public WALCellCodec()

All subclasses must implement a no argument constructor

WALCellCodec

public WALCellCodec(org.apache.hadoop.conf.Configuration conf,
                    CompressionContext compression)

Default constructor - all subclasses must implement a constructor with this signature if they are to be dynamically loaded from the Configuration.

参数:

conf - configuration to configure this

compression - compression the codec should support, can be null to indicate no compression

方法详细资料

getWALCellCodecClass

public static Class<?> getWALCellCodecClass(org.apache.hadoop.conf.Configuration conf)

create

public static WALCellCodec create(org.apache.hadoop.conf.Configuration conf,
                                  String cellCodecClsName,
                                  CompressionContext compression)
                           throws UnsupportedOperationException

Create and setup a WALCellCodec from the cellCodecClsName and CompressionContext, if cellCodecClsName is specified. Otherwise Cell Codec classname is read from Configuration. Fully prepares the codec for use.

参数:

conf - Configuration to read for the user-specified codec. If none is specified, uses a WALCellCodec.

cellCodecClsName - name of codec

compression - compression the codec should use

返回:

a WALCellCodec ready for use.

抛出:

UnsupportedOperationException - if the codec cannot be instantiated

create

public static WALCellCodec create(org.apache.hadoop.conf.Configuration conf,
                                  CompressionContext compression)
                           throws UnsupportedOperationException

Create and setup a WALCellCodec from the CompressionContext. Cell Codec classname is read from Configuration. Fully prepares the codec for use.

参数:

conf - Configuration to read for the user-specified codec. If none is specified, uses a WALCellCodec.

compression - compression the codec should use

返回:

a WALCellCodec ready for use.

抛出:

UnsupportedOperationException - if the codec cannot be instantiated

getDecoder

public Codec.Decoder getDecoder(InputStream is)

指定者:

getDecoder 在接口中 Codec

getDecoder

public Codec.Decoder getDecoder(ByteBuff buf)

指定者:

getDecoder 在接口中 Codec

getEncoder

public Codec.Encoder getEncoder(OutputStream os)

指定者:

getEncoder 在接口中 Codec

getByteStringCompressor

public WALCellCodec.ByteStringCompressor getByteStringCompressor()

getByteStringUncompressor

public WALCellCodec.ByteStringUncompressor getByteStringUncompressor()

getNoneCompressor

public static WALCellCodec.ByteStringCompressor getNoneCompressor()

getNoneUncompressor

public static WALCellCodec.ByteStringUncompressor getNoneUncompressor()