org.apache.hadoop.hbase.io.hfile

类 AbstractHFileReader.Scanner

java.lang.Object

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

所有已实现的接口:

HFileScanner

直接已知子类:

HFileReaderV2.AbstractScannerV2

封闭类:

AbstractHFileReader

protected abstract static class AbstractHFileReader.Scanner
extends Object
implements HFileScanner

字段概要

字段

限定符和类型	字段和说明
protected ByteBuffer	blockBuffer
protected AtomicInteger	blockFetches
protected boolean	cacheBlocks
protected int	currKeyLen
protected long	currMemstoreTS
protected int	currMemstoreTSLen
protected int	currValueLen
protected boolean	isCompaction
protected boolean	pread
protected HFile.Reader	reader

构造器概要

构造器

构造器和说明
AbstractHFileReader.Scanner(HFile.Reader reader, boolean cacheBlocks, boolean pread, boolean isCompaction)

方法概要

方法

限定符和类型	方法和说明
protected void	assertSeeked()
void	close() Close the stream socket to handle RS CLOSE_WAIT.
HFile.Reader	getReader()
boolean	isSeeked()
int	reseekTo(byte[] key) Reseek to or just before the passed key.
boolean	seekBefore(byte[] key) Consider the key stream of all the keys in the file, k[0] .. k[n], where there are n keys in the file.
int	seekTo(byte[] key) SeekTo or just before the passed key.
String	toString()

从类继承的方法 java.lang.Object

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

从接口继承的方法 org.apache.hadoop.hbase.io.hfile.HFileScanner

getKey, getKeyString, getKeyValue, getNextIndexedKey, getValue, getValueString, next, reseekTo, reseekTo, seekBefore, seekBefore, seekTo, seekTo, seekTo

字段详细资料

blockBuffer

protected ByteBuffer blockBuffer

cacheBlocks

protected boolean cacheBlocks

pread

protected final boolean pread

isCompaction

protected final boolean isCompaction

currKeyLen

protected int currKeyLen

currValueLen

protected int currValueLen

currMemstoreTSLen

protected int currMemstoreTSLen

currMemstoreTS

protected long currMemstoreTS

blockFetches

protected AtomicInteger blockFetches

reader

protected final HFile.Reader reader

构造器详细资料

AbstractHFileReader.Scanner

public AbstractHFileReader.Scanner(HFile.Reader reader,
                           boolean cacheBlocks,
                           boolean pread,
                           boolean isCompaction)

方法详细资料

isSeeked

public boolean isSeeked()

指定者:

isSeeked 在接口中 HFileScanner

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.

toString

public String toString()

覆盖:

toString 在类中 Object

assertSeeked

protected void assertSeeked()

seekTo

public int seekTo(byte[] key)
           throws IOException

从接口复制的说明: HFileScanner

SeekTo or just before the passed key. Examine the return code to figure whether we found the key or not. Consider the key stream of all the keys in the file, k[0] .. k[n], where there are n keys in the file.

指定者:

seekTo 在接口中 HFileScanner

参数:

key - Key to find.

返回:

-1, if key < k[0], no position; 0, such that k[i] = key and scanner is left in position i; and 1, such that k[i] < key, and scanner is left in position i. The scanner will position itself between k[i] and k[i+1] where k[i] < key <= k[i+1]. If there is no key k[i+1] greater than or equal to the input key, then the scanner will position itself at the end of the file and next() will return false when it is called.

抛出:

IOException

seekBefore

public boolean seekBefore(byte[] key)
                   throws IOException

从接口复制的说明: HFileScanner

Consider the key stream of all the keys in the file, k[0] .. k[n], where there are n keys in the file.

指定者:

seekBefore 在接口中 HFileScanner

参数:

key - Key to find

返回:

false if key <= k[0] or true with scanner in position 'i' such that: k[i] < key. Furthermore: there may be a k[i+1], such that k[i] < key <= k[i+1] but there may also NOT be a k[i+1], and next() will return false (EOF).

抛出:

IOException

reseekTo

public int reseekTo(byte[] key)
             throws IOException

从接口复制的说明: HFileScanner

Reseek to or just before the passed key. Similar to seekTo except that this can be called even if the scanner is not at the beginning of a file. This can be used to seek only to keys which come after the current position of the scanner. Consider the key stream of all the keys in the file, k[0] .. k[n], where there are n keys in the file after current position of HFileScanner. The scanner will position itself between k[i] and k[i+1] where k[i] < key <= k[i+1]. If there is no key k[i+1] greater than or equal to the input key, then the scanner will position itself at the end of the file and next() will return false when it is called.

指定者:

reseekTo 在接口中 HFileScanner

参数:

key - Key to find (should be non-null)

返回:

-1, if key < k[0], no position; 0, such that k[i] = key and scanner is left in position i; and 1, such that k[i] < key, and scanner is left in position i.

抛出:

IOException

getReader

public HFile.Reader getReader()

指定者:

getReader 在接口中 HFileScanner

返回:

Reader that underlies this Scanner instance.

close

public void close()

从接口复制的说明: HFileScanner

Close the stream socket to handle RS CLOSE_WAIT. HBASE-9393

指定者:

close 在接口中 HFileScanner