org.apache.hadoop.hbase.regionserver
Class ScanDeleteTracker

java.lang.Object
  org.apache.hadoop.hbase.regionserver.ScanDeleteTracker

All Implemented Interfaces:

DeleteTracker

Direct Known Subclasses:

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

  Nested Class Summary

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

  DeleteTracker.DeleteCompare, DeleteTracker.DeleteResult

  Field Summary

  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

  Constructor Summary

  ScanDeleteTracker()
  Constructor for ScanDeleteTracker

  Method Summary

  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.

  Methods inherited from class java.lang.Object

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

  Field Detail

  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

  Constructor Detail

  ScanDeleteTracker

  public ScanDeleteTracker()

  Constructor for ScanDeleteTracker

  Method Detail

  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.

  Specified by:

  add in interface DeleteTracker

  Parameters:

  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.

  Specified by:

  isDeleted in interface DeleteTracker

  Parameters:

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

  Returns:

  deleteResult

  isEmpty

  public boolean isEmpty()

  Specified by:

  isEmpty in interface DeleteTracker

  Returns:

  true if there are no current delete, false otherwise

  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