org.apache.hadoop.hbase.io.hfile

类 HFileReaderImpl.EncodedScanner

java.lang.Object

org.apache.hadoop.hbase.io.hfile.HFileReaderImpl.HFileScannerImpl

org.apache.hadoop.hbase.io.hfile.HFileReaderImpl.EncodedScanner

所有已实现的接口:

Closeable, AutoCloseable, HFileScanner, Shipper

封闭类:

HFileReaderImpl

protected static class HFileReaderImpl.EncodedScanner
extends HFileReaderImpl.HFileScannerImpl

Scanner that operates on encoded data blocks.

字段概要

从类继承的字段 org.apache.hadoop.hbase.io.hfile.HFileReaderImpl.HFileScannerImpl

blockFetches, cacheBlocks, curBlock, isCompaction, nextIndexedKey, pread, prevBlocks, reader

构造器概要

构造器

构造器和说明
EncodedScanner(HFile.Reader reader, boolean cacheBlocks, boolean pread, boolean isCompaction, HFileContext meta)

方法概要

限定符和类型	方法和说明
int	compareKey(CellComparator comparator, Cell key)
Cell	getCell()
protected Cell	getFirstKeyCellInBlock(HFileBlock curBlock)
Cell	getKey() Gets the current key in the form of a cell.
String	getKeyString() Convenience method to get a copy of the key as a string - interpreting the bytes as UTF8.
ByteBuffer	getValue() Gets a buffer view to the current value.
String	getValueString() Convenience method to get a copy of the value as a string - interpreting the bytes as UTF8.
boolean	isSeeked()
protected int	loadBlockAndSeekToKey(HFileBlock seekToBlock, Cell nextIndexedKey, boolean rewind, Cell key, boolean seekBefore)
boolean	next() Go to the next key/value in the block section.
protected boolean	processFirstDataBlock()
void	setNonSeekedState()
protected void	updateCurrentBlock(HFileBlock newBlock) Updates the current block to be the given HFileBlock.

从类继承的方法 org.apache.hadoop.hbase.io.hfile.HFileReaderImpl.HFileScannerImpl

assertSeeked, blockSeek, checkKeyLen, checkKeyValueLen, checkLen, close, getEffectiveDataBlockEncoding, getNextIndexedKey, getReader, readAndUpdateNewBlock, readKeyValueLen, readMvccVersion, readNextDataBlock, reseekTo, seekBefore, seekTo, seekTo, seekTo, shipped, toString

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

EncodedScanner

public EncodedScanner(HFile.Reader reader,
                      boolean cacheBlocks,
                      boolean pread,
                      boolean isCompaction,
                      HFileContext meta)

方法详细资料

isSeeked

public boolean isSeeked()

指定者:

isSeeked 在接口中 HFileScanner

覆盖:

isSeeked 在类中 HFileReaderImpl.HFileScannerImpl

返回:

True is scanner has had one of the seek calls invoked; i.e. HFileScanner.seekBefore(Cell) or HFileScanner.seekTo() or HFileScanner.seekTo(Cell). Otherwise returns false.

setNonSeekedState

public void setNonSeekedState()

覆盖:

setNonSeekedState 在类中 HFileReaderImpl.HFileScannerImpl

updateCurrentBlock

protected void updateCurrentBlock(HFileBlock newBlock)
                           throws CorruptHFileException

Updates the current block to be the given HFileBlock. Seeks to the the first key/value pair.

覆盖:

updateCurrentBlock 在类中 HFileReaderImpl.HFileScannerImpl

参数:

newBlock - the block to make current

抛出:

CorruptHFileException

processFirstDataBlock

protected boolean processFirstDataBlock()
                                 throws IOException

覆盖:

processFirstDataBlock 在类中 HFileReaderImpl.HFileScannerImpl

抛出:

IOException

next

public boolean next()
             throws IOException

从类复制的说明: HFileReaderImpl.HFileScannerImpl

Go to the next key/value in the block section. Loads the next block if necessary. If successful, HFileReaderImpl.HFileScannerImpl.getKey() and HFileReaderImpl.HFileScannerImpl.getValue() can be called.

指定者:

next 在接口中 HFileScanner

覆盖:

next 在类中 HFileReaderImpl.HFileScannerImpl

返回:

true if successfully navigated to the next key/value

抛出:

IOException

getKey

public Cell getKey()

从接口复制的说明: HFileScanner

Gets the current key in the form of a cell. You must call HFileScanner.seekTo(Cell) before this method.

指定者:

getKey 在接口中 HFileScanner

覆盖:

getKey 在类中 HFileReaderImpl.HFileScannerImpl

返回:

gets the current key as a Cell.

getValue

public ByteBuffer getValue()

从接口复制的说明: HFileScanner

Gets a buffer view to the current value. You must call HFileScanner.seekTo(Cell) before this method.

指定者:

getValue 在接口中 HFileScanner

覆盖:

getValue 在类中 HFileReaderImpl.HFileScannerImpl

返回:

byte buffer for the value. The limit is set to the value size, and the position is 0, the start of the buffer view.

getCell

public Cell getCell()

指定者:

getCell 在接口中 HFileScanner

覆盖:

getCell 在类中 HFileReaderImpl.HFileScannerImpl

返回:

Instance of Cell.

getKeyString

public String getKeyString()

从接口复制的说明: HFileScanner

Convenience method to get a copy of the key as a string - interpreting the bytes as UTF8. You must call HFileScanner.seekTo(Cell) before this method.

指定者:

getKeyString 在接口中 HFileScanner

覆盖:

getKeyString 在类中 HFileReaderImpl.HFileScannerImpl

返回:

key as a string

getValueString

public String getValueString()

从接口复制的说明: HFileScanner

Convenience method to get a copy of the value as a string - interpreting the bytes as UTF8. You must call HFileScanner.seekTo(Cell) before this method.

指定者:

getValueString 在接口中 HFileScanner

覆盖:

getValueString 在类中 HFileReaderImpl.HFileScannerImpl

返回:

value as a string

getFirstKeyCellInBlock

protected Cell getFirstKeyCellInBlock(HFileBlock curBlock)

覆盖:

getFirstKeyCellInBlock 在类中 HFileReaderImpl.HFileScannerImpl

loadBlockAndSeekToKey

protected int loadBlockAndSeekToKey(HFileBlock seekToBlock,
                                    Cell nextIndexedKey,
                                    boolean rewind,
                                    Cell key,
                                    boolean seekBefore)
                             throws IOException

覆盖:

loadBlockAndSeekToKey 在类中 HFileReaderImpl.HFileScannerImpl

抛出:

IOException

compareKey

public int compareKey(CellComparator comparator,
                      Cell key)

覆盖:

compareKey 在类中 HFileReaderImpl.HFileScannerImpl