org.apache.hadoop.hbase.regionserver

Interface DeleteTracker

All Known Implementing Classes:

ScanDeleteTracker

@InterfaceAudience.Private
public interface DeleteTracker

This interface is used for the tracking and enforcement of Deletes during the course of a Get or Scan operation.

This class is utilized through three methods:

• add(byte[], int, int, long, byte) when encountering a Delete
• isDeleted(byte[], int, int, long) when checking if a Put KeyValue has been deleted
• update() when reaching the end of a StoreFile

Nested Class Summary

Nested Classes

Modifier and Type	Interface and Description
static class	DeleteTracker.DeleteCompare Return codes for comparison of two Deletes.
static class	DeleteTracker.DeleteResult Returns codes for delete result.

Method Summary

Methods

Modifier and Type	Method and Description
void	add(byte[] buffer, int qualifierOffset, int qualifierLength, long timestamp, byte type) Add the specified KeyValue to the list of deletes to check against for this row operation.
DeleteTracker.DeleteResult	isDeleted(byte[] buffer, int qualifierOffset, int qualifierLength, long timestamp) 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.

Method Detail

add

void add(byte[] buffer,
       int qualifierOffset,
       int qualifierLength,
       long timestamp,
       byte type)

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

This is called when a Delete is encountered in a StoreFile.

Parameters:

buffer - KeyValue buffer

qualifierOffset - column qualifier offset

qualifierLength - column qualifier length

timestamp - timestamp

type - delete type as byte

isDeleted

DeleteTracker.DeleteResult isDeleted(byte[] buffer,
                                   int qualifierOffset,
                                   int qualifierLength,
                                   long timestamp)

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

Parameters:

buffer - KeyValue buffer

qualifierOffset - column qualifier offset

qualifierLength - column qualifier length

timestamp - timestamp

Returns:

deleteResult The result tells whether the KeyValue is deleted and why

isEmpty

boolean isEmpty()

Returns:

true if there are no current delete, false otherwise

update

void update()

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.

reset

void reset()

Called between rows.

This clears everything as if a new DeleteTracker was instantiated.