Package org.apache.hadoop.hbase.regionserver.querymatcher

Class ScanDeleteTracker

java.lang.Object

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

All Implemented Interfaces:

DeleteTracker, ShipperListener

Direct Known Subclasses:

VisibilityScanDeleteTracker

@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.ExtendedCell) when encountering a Delete or DeleteColumn
• isDeleted(org.apache.hadoop.hbase.ExtendedCell) when checking if a Put Cell 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

Nested Class Summary

Nested classes/interfaces inherited from interface org.apache.hadoop.hbase.regionserver.querymatcher.DeleteTracker

DeleteTracker.DeleteResult

Field Summary

Fields

Modifier and Type	Field	Description
protected final CellComparator	comparator
protected byte[]	deleteBuffer
protected ExtendedCell	deleteCell
protected int	deleteLength
protected int	deleteOffset
protected long	deleteTimestamp
protected byte	deleteType
protected long	familyStamp
protected SortedSet<Long>	familyVersionStamps
protected boolean	hasFamilyStamp

Constructor Summary

Constructors

Constructor	Description
ScanDeleteTracker(CellComparator comparator)

Method Summary

Modifier and Type	Method	Description
void	add(ExtendedCell cell)	Add the specified Cell to the list of deletes to check against for this row operation.
void	beforeShipped()	The action that needs to be performed before Shipper.shipped() is performed
CellComparator	getCellComparator()	Return the comparator passed to this delete tracker
DeleteTracker.DeleteResult	isDeleted(ExtendedCell cell)	Check if the specified Cell buffer has been deleted by a previously seen delete.
boolean	isEmpty()	Returns true if there are no current delete, false otherwise
void	reset()	Called between rows.
void	update()	Called at the end of every StoreFile.

Methods inherited from class java.lang.Object

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

Field Details

hasFamilyStamp

protected boolean hasFamilyStamp

familyStamp

protected long familyStamp

familyVersionStamps

protected SortedSet<Long> familyVersionStamps

deleteCell

protected ExtendedCell deleteCell

deleteBuffer

protected byte[] deleteBuffer

deleteOffset

protected int deleteOffset

deleteLength

protected int deleteLength

deleteType

protected byte deleteType

deleteTimestamp

protected long deleteTimestamp

comparator

protected final CellComparator comparator

Constructor Details

ScanDeleteTracker

public ScanDeleteTracker(CellComparator comparator)

Method Details

add

public void add(ExtendedCell cell)

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

This is called when a Delete is encountered.

Specified by:

add in interface DeleteTracker

Parameters:

cell - - the delete cell

isDeleted

public DeleteTracker.DeleteResult isDeleted(ExtendedCell cell)

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

Specified by:

isDeleted in interface DeleteTracker

Parameters:

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

Returns:

deleteResult The result tells whether the Cell is deleted and why

isEmpty

public boolean isEmpty()

Description copied from interface: DeleteTracker

Returns true if there are no current delete, false otherwise

Specified by:

isEmpty in interface DeleteTracker

reset

public void reset()

Description copied from interface: DeleteTracker

Called between rows.

This clears everything as if a new DeleteTracker was instantiated.

Specified by:

reset in interface DeleteTracker

update

public void update()

Description copied from interface: 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.

Specified by:

update in interface DeleteTracker

beforeShipped

public void beforeShipped()
                   throws IOException

Description copied from interface: ShipperListener

The action that needs to be performed before Shipper.shipped() is performed

Specified by:

beforeShipped in interface ShipperListener

Throws:

IOException

getCellComparator

public CellComparator getCellComparator()

Description copied from interface: DeleteTracker

Return the comparator passed to this delete tracker

Specified by:

getCellComparator in interface DeleteTracker

Returns:

the cell comparator