org.apache.hadoop.hbase.io.hfile

类 HFileReaderV3.ScannerV3

java.lang.Object

org.apache.hadoop.hbase.io.hfile.AbstractHFileReader.Scanner

org.apache.hadoop.hbase.io.hfile.HFileReaderV2.AbstractScannerV2

org.apache.hadoop.hbase.io.hfile.HFileReaderV2.ScannerV2

org.apache.hadoop.hbase.io.hfile.HFileReaderV3.ScannerV3

所有已实现的接口:

HFileScanner

封闭类:

HFileReaderV3

protected static class HFileReaderV3.ScannerV3
extends HFileReaderV2.ScannerV2

Implementation of HFileScanner interface.

字段概要

从类继承的字段 org.apache.hadoop.hbase.io.hfile.HFileReaderV2.AbstractScannerV2

block, nextIndexedKey

从类继承的字段 org.apache.hadoop.hbase.io.hfile.AbstractHFileReader.Scanner

blockBuffer, blockFetches, cacheBlocks, currKeyLen, currMemstoreTS, currMemstoreTSLen, currValueLen, isCompaction, pread

构造器概要

构造器

构造器和说明
HFileReaderV3.ScannerV3(HFileReaderV3 r, boolean cacheBlocks, boolean pread, boolean isCompaction)

方法概要

方法

限定符和类型	方法和说明
protected int	blockSeek(Cell key, boolean seekBefore) Within a loaded block, seek looking for the last key that is smaller than (or equal to?)
protected int	getCellBufSize()
Cell	getKeyValue()
protected int	getNextCellStartPosition()
protected void	readKeyValueLen()
protected void	setNonSeekedState()

从类继承的方法 org.apache.hadoop.hbase.io.hfile.HFileReaderV2.ScannerV2

checkKeyLen, checkKeyValueLen, checkLen, compareKey, compareKey, formNoTagsKeyValue, getFirstKeyInBlock, getKey, getKeyString, getValue, getValueString, loadBlockAndSeekToKey, next, readMvccVersion, readMvccVersion, seekTo, updateCurrBlock

从类继承的方法 org.apache.hadoop.hbase.io.hfile.HFileReaderV2.AbstractScannerV2

getEffectiveDataBlockEncoding, getNextIndexedKey, readNextDataBlock, reseekTo, reseekTo, seekBefore, seekBefore, seekTo, seekTo, seekTo

从类继承的方法 org.apache.hadoop.hbase.io.hfile.AbstractHFileReader.Scanner

assertSeeked, close, getReader, isSeeked, reseekTo, seekBefore, seekTo, 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

HFileReaderV3.ScannerV3

public HFileReaderV3.ScannerV3(HFileReaderV3 r,
                       boolean cacheBlocks,
                       boolean pread,
                       boolean isCompaction)

方法详细资料

getCellBufSize

protected int getCellBufSize()

覆盖:

getCellBufSize 在类中 HFileReaderV2.ScannerV2

getKeyValue

public Cell getKeyValue()

指定者:

getKeyValue 在接口中 HFileScanner

覆盖:

getKeyValue 在类中 HFileReaderV2.ScannerV2

返回:

Instance of KeyValue.

setNonSeekedState

protected void setNonSeekedState()

覆盖:

setNonSeekedState 在类中 HFileReaderV2.ScannerV2

getNextCellStartPosition

protected int getNextCellStartPosition()

覆盖:

getNextCellStartPosition 在类中 HFileReaderV2.ScannerV2

readKeyValueLen

protected final void readKeyValueLen()

覆盖:

readKeyValueLen 在类中 HFileReaderV2.ScannerV2

blockSeek

protected int blockSeek(Cell key,
            boolean seekBefore)

Within a loaded block, seek looking for the last key that is smaller than (or equal to?) the key we are interested in. A note on the seekBefore: if you have seekBefore = true, AND the first key in the block = key, then you'll get thrown exceptions. The caller has to check for that case and load the previous block as appropriate.

覆盖:

blockSeek 在类中 HFileReaderV2.ScannerV2

参数:

key - the key to find

seekBefore - find the key before the given key in case of exact match.

返回:

0 in case of an exact key match, 1 in case of an inexact match, -2 in case of an inexact match and furthermore, the input key less than the first key of current block(e.g. using a faked index key)