org.apache.hadoop.hbase.regionserver.querymatcher

类 ScanDeleteTracker

java.lang.Object

org.apache.hadoop.hbase.regionserver.querymatcher.ScanDeleteTracker

所有已实现的接口:

DeleteTracker

直接已知子类:

VisibilityScanDeleteTracker

@InterfaceAudience.Private
public class ScanDeleteTracker
extends Object
implements DeleteTracker

This class is responsible for the tracking and enforcement of Deletes during the course of a Scan operation. It only has to enforce Delete and DeleteColumn, since the DeleteFamily is handled at a higher level.

This class is utilized through three methods:

• add(org.apache.hadoop.hbase.Cell) when encountering a Delete or DeleteColumn
• isDeleted(org.apache.hadoop.hbase.Cell) when checking if a Put KeyValue has been deleted
• update() when reaching the end of a StoreFile or row for scans

This class is NOT thread-safe as queries are never multi-threaded

嵌套类概要

从接口继承的嵌套类/接口 org.apache.hadoop.hbase.regionserver.DeleteTracker

DeleteTracker.DeleteCompare, DeleteTracker.DeleteResult

字段概要

字段

限定符和类型	字段和说明
protected byte[]	deleteBuffer
protected int	deleteLength
protected int	deleteOffset
protected long	deleteTimestamp
protected byte	deleteType
protected long	familyStamp
protected SortedSet<Long>	familyVersionStamps
protected boolean	hasFamilyStamp

构造器概要

构造器

构造器和说明
ScanDeleteTracker()

方法概要

方法

限定符和类型	方法和说明
void	add(Cell cell) Add the specified KeyValue to the list of deletes to check against for this row operation.
DeleteTracker.DeleteResult	isDeleted(Cell cell) Check if the specified KeyValue buffer has been deleted by a previously seen delete.
boolean	isEmpty()
void	reset() Called between rows.
void	update() Called at the end of every StoreFile.

从类继承的方法 java.lang.Object

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

字段详细资料

hasFamilyStamp

protected boolean hasFamilyStamp

familyStamp

protected long familyStamp

familyVersionStamps

protected SortedSet<Long> familyVersionStamps

deleteBuffer

protected byte[] deleteBuffer

deleteOffset

protected int deleteOffset

deleteLength

protected int deleteLength

deleteType

protected byte deleteType

deleteTimestamp

protected long deleteTimestamp

构造器详细资料

ScanDeleteTracker

public ScanDeleteTracker()

方法详细资料

add

public void add(Cell cell)

Add the specified KeyValue to the list of deletes to check against for this row operation.

This is called when a Delete is encountered.

指定者:

add 在接口中 DeleteTracker

参数:

cell - - the delete cell

isDeleted

public DeleteTracker.DeleteResult isDeleted(Cell cell)

Check if the specified KeyValue buffer has been deleted by a previously seen delete.

指定者:

isDeleted 在接口中 DeleteTracker

参数:

cell - - current cell to check if deleted by a previously seen delete

返回:

deleteResult

isEmpty

public boolean isEmpty()

指定者:

isEmpty 在接口中 DeleteTracker

返回:

true if there are no current delete, false otherwise

reset

public void reset()

从接口复制的说明: DeleteTracker

Called between rows.

This clears everything as if a new DeleteTracker was instantiated.

指定者:

reset 在接口中 DeleteTracker

update

public void update()

从接口复制的说明: DeleteTracker

Called at the end of every StoreFile.

Many optimized implementations of Trackers will require an update at when the end of each StoreFile is reached.

指定者:

update 在接口中 DeleteTracker