[HBASE-11054] Create new hook in StoreScanner to help user creating his own delete tracker

• Type: Sub-task
• Status: Closed
• Priority: Major
• Resolution: Fixed
• Fix Version/s: 0.99.0, 0.98.2
• Hadoop Flags: Incompatible change, Reviewed

Release Note

Creates a new hook in the RegionObserver Coprocessor,
{code}
RegionObserver postInstantiateDeleteTracker(final ObserverContext<RegionCoprocessorEnvironment> ctx, DeleteTracker delTracker)
{code}
Introduced in 0.98.2.

• Assignee: ramkrishna.s.vasudevan
• Reporter: ramkrishna.s.vasudevan
• Created: 23/Apr/14 11:37
• Updated: 21/Feb/15 23:32
• Resolved: 28/Apr/14 06:26

Description

In case of Visibility labels, to support deletes we need to consider the visibility expression per version inorder to identify the matching visibility expression.
Tracking the visibility tags along with the delete tracker would make things easier rather than handling during scans/compactions.