org.apache.hadoop.hbase.io.hfile

Class 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

All Implemented Interfaces:

HFileScanner

Enclosing class:

HFileReaderV3

protected static class HFileReaderV3.ScannerV3
extends HFileReaderV2.ScannerV2

Implementation of HFileScanner interface.

Field Summary

Fields inherited from class org.apache.hadoop.hbase.io.hfile.HFileReaderV2.AbstractScannerV2

block, nextIndexedKey

Fields inherited from class org.apache.hadoop.hbase.io.hfile.AbstractHFileReader.Scanner

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

Constructor Summary

Constructors

Constructor and Description
HFileReaderV3.ScannerV3(HFileReaderV3 r, boolean cacheBlocks, boolean pread, boolean isCompaction)

Method Summary

Methods

Modifier and Type	Method and Description
protected int	blockSeek(byte[] key, int offset, int length, 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.
protected int	getCellBufSize()
protected int	getNextCellStartPosition()
protected void	readKeyValueLen()
protected void	setNonSeekedState()

Methods inherited from class org.apache.hadoop.hbase.io.hfile.HFileReaderV2.ScannerV2

compareKey, getFirstKeyInBlock, getKey, getKeyString, getKeyValue, getValue, getValueString, loadBlockAndSeekToKey, next, readMvccVersion, seekTo, updateCurrBlock

Methods inherited from class org.apache.hadoop.hbase.io.hfile.HFileReaderV2.AbstractScannerV2

readNextDataBlock, reseekTo, seekBefore, seekTo, seekTo

Methods inherited from class org.apache.hadoop.hbase.io.hfile.AbstractHFileReader.Scanner

assertSeeked, getReader, isSeeked, reseekTo, seekBefore, seekTo, toString

Methods inherited from class java.lang.Object

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

Constructor Detail

HFileReaderV3.ScannerV3

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

Method Detail

getCellBufSize

protected int getCellBufSize()

Overrides:

getCellBufSize in class HFileReaderV2.ScannerV2

setNonSeekedState

protected void setNonSeekedState()

Overrides:

setNonSeekedState in class HFileReaderV2.ScannerV2

getNextCellStartPosition

protected int getNextCellStartPosition()

Overrides:

getNextCellStartPosition in class HFileReaderV2.ScannerV2

readKeyValueLen

protected void readKeyValueLen()

Overrides:

readKeyValueLen in class HFileReaderV2.ScannerV2

blockSeek

protected int blockSeek(byte[] key,
            int offset,
            int length,
            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.

Overrides:

blockSeek in class HFileReaderV2.ScannerV2

Parameters:

key - the key to find

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

offset - Offset to find the key in the given bytebuffer

length - Length of the key to be found

Returns:

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)