org.apache.hadoop.hbase.io.hfile

类 HFileReaderV2.EncodedScannerV2

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.EncodedScannerV2

所有已实现的接口:

HFileScanner

直接已知子类:

HFileReaderV3.EncodedScannerV3

封闭类:

HFileReaderV2

protected static class HFileReaderV2.EncodedScannerV2
extends HFileReaderV2.AbstractScannerV2

ScannerV2 that operates on encoded data blocks.

字段概要

字段

限定符和类型	字段和说明
protected HFileContext	meta

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, reader

构造器概要

构造器

构造器和说明
HFileReaderV2.EncodedScannerV2(HFileReaderV2 reader, boolean cacheBlocks, boolean pread, boolean isCompaction, HFileContext meta)

方法概要

方法

限定符和类型	方法和说明
int	compareKey(KeyValue.KVComparator comparator, byte[] key, int offset, int length) Compare the given key against the current key
int	compareKey(KeyValue.KVComparator comparator, Cell key)
protected ByteBuffer	getFirstKeyInBlock(HFileBlock curBlock)
ByteBuffer	getKey() Gets a buffer view to the current key.
String	getKeyString() Convenience method to get a copy of the key as a string - interpreting the bytes as UTF8.
Cell	getKeyValue()
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() Scans to the next entry in the file.
boolean	seekTo() Positions this scanner at the start of the file.

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, reseekTo, seekBefore, seekTo, toString

从类继承的方法 java.lang.Object

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

字段详细资料

meta

protected final HFileContext meta

构造器详细资料

HFileReaderV2.EncodedScannerV2

public HFileReaderV2.EncodedScannerV2(HFileReaderV2 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 AbstractHFileReader.Scanner

返回:

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

seekTo

public boolean seekTo()
               throws IOException

从接口复制的说明: HFileScanner

Positions this scanner at the start of the file.

返回:

False if empty file; i.e. a call to next would return false and the current key and value are undefined.

抛出:

IOException

next

public boolean next()
             throws IOException

从接口复制的说明: HFileScanner

Scans to the next entry in the file.

返回:

Returns false if you are at the end otherwise true if more in file.

抛出:

IOException

getKey

public ByteBuffer getKey()

从接口复制的说明: HFileScanner

Gets a buffer view to the current key. You must call HFileScanner.seekTo(byte[]) before this method.

返回:

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

compareKey

public int compareKey(KeyValue.KVComparator comparator,
             byte[] key,
             int offset,
             int length)

从类复制的说明: HFileReaderV2.AbstractScannerV2

Compare the given key against the current key

指定者:

compareKey 在类中 HFileReaderV2.AbstractScannerV2

返回:

-1 is the passed key is smaller than the current key, 0 if equal and 1 if greater

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(byte[]) before this method.

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.

getKeyValue

public Cell getKeyValue()

返回:

Instance of KeyValue.

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(byte[]) before this method.

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(byte[]) before this method.

返回:

value as a string

getFirstKeyInBlock

protected ByteBuffer getFirstKeyInBlock(HFileBlock curBlock)

指定者:

getFirstKeyInBlock 在类中 HFileReaderV2.AbstractScannerV2

loadBlockAndSeekToKey

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

指定者:

loadBlockAndSeekToKey 在类中 HFileReaderV2.AbstractScannerV2

抛出:

IOException

compareKey

public int compareKey(KeyValue.KVComparator comparator,
             Cell key)

指定者:

compareKey 在类中 HFileReaderV2.AbstractScannerV2