org.apache.hadoop.hbase.regionserver.wal

类 SequenceFileLogReader

java.lang.Object

org.apache.hadoop.hbase.regionserver.wal.ReaderBase

org.apache.hadoop.hbase.regionserver.wal.SequenceFileLogReader

所有已实现的接口:

Closeable, AutoCloseable, DefaultWALProvider.Reader, WAL.Reader

@InterfaceAudience.LimitedPrivate(value={"Coprocesssor","Phoenix","Configuration"})
public class SequenceFileLogReader
extends ReaderBase

字段概要

字段

限定符和类型	字段和说明
protected org.apache.hadoop.io.SequenceFile.Reader	reader

从类继承的字段 org.apache.hadoop.hbase.regionserver.wal.ReaderBase

compressionContext, conf, edit, emptyCompressionContext, fileLength, fs, path

构造器概要

构造器

构造器和说明
SequenceFileLogReader()

方法概要

方法

限定符和类型	方法和说明
protected IOException	addFileInfoToException(IOException ioe)
void	close()
long	getPosition()
protected boolean	hasCompression()
protected boolean	hasTagCompression()
protected void	initAfterCompression() Initializes the compression after the shared stuff has been initialized.
protected void	initAfterCompression(String cellCodecClsName) Initializes the compression after the shared stuff has been initialized.
protected String	initReader(org.apache.hadoop.fs.FSDataInputStream stream) Initializes the log reader with a particular stream (may be null).
protected boolean	readNext(WAL.Entry e) fill in the passed entry with teh next key/value.
void	reset()
protected void	seekOnFs(long pos) Performs a filesystem-level seek to a certain position in an underlying file.

从类继承的方法 org.apache.hadoop.hbase.regionserver.wal.ReaderBase

init, next, next, seek

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

reader

protected org.apache.hadoop.io.SequenceFile.Reader reader

构造器详细资料

SequenceFileLogReader

public SequenceFileLogReader()

方法详细资料

close

public void close()
           throws IOException

抛出:

IOException

getPosition

public long getPosition()
                 throws IOException

抛出:

IOException

reset

public void reset()
           throws IOException

抛出:

IOException

initReader

protected String initReader(org.apache.hadoop.fs.FSDataInputStream stream)
                     throws IOException

从类复制的说明: ReaderBase

Initializes the log reader with a particular stream (may be null). Reader assumes ownership of the stream if not null and may use it. Called once.

指定者:

initReader 在类中 ReaderBase

返回:

the class name of cell Codec, null if such information is not available

抛出:

IOException

initAfterCompression

protected void initAfterCompression(String cellCodecClsName)
                             throws IOException

从类复制的说明: ReaderBase

Initializes the compression after the shared stuff has been initialized. Called once.

指定者:

initAfterCompression 在类中 ReaderBase

参数:

cellCodecClsName - class name of cell Codec

抛出:

IOException

initAfterCompression

protected void initAfterCompression()
                             throws IOException

从类复制的说明: ReaderBase

Initializes the compression after the shared stuff has been initialized. Called once.

指定者:

initAfterCompression 在类中 ReaderBase

抛出:

IOException

hasCompression

protected boolean hasCompression()

指定者:

hasCompression 在类中 ReaderBase

返回:

Whether compression is enabled for this log.

hasTagCompression

protected boolean hasTagCompression()

指定者:

hasTagCompression 在类中 ReaderBase

返回:

Whether tag compression is enabled for this log.

readNext

protected boolean readNext(WAL.Entry e)
                    throws IOException

fill in the passed entry with teh next key/value. Note that because this format deals with our legacy storage, the provided Entery MUST use an HLogKey for the key.

指定者:

readNext 在类中 ReaderBase

参数:

e - The entry to read into.

返回:

boolean indicating if the contents of Entry have been filled in.

抛出:

IOException

seekOnFs

protected void seekOnFs(long pos)
                 throws IOException

从类复制的说明: ReaderBase

Performs a filesystem-level seek to a certain position in an underlying file.

指定者:

seekOnFs 在类中 ReaderBase

抛出:

IOException

addFileInfoToException

protected IOException addFileInfoToException(IOException ioe)
                                      throws IOException

抛出:

IOException