[HBASE-9507] Promote methods of WALActionsListener to WALObserver

• Type: Brainstorming
• Status: Closed
• Priority: Minor
• Resolution: Won't Fix
• Fix Version/s: 0.99.0
• Component/s: Coprocessors, wal
• Assignee: Unassigned
• Reporter: Nick Dimiduk
• Created: 11/Sep/13 19:46
• Updated: 21/Feb/15 23:30
• Resolved: 19/May/14 10:32

Description

The interface exposed by WALObserver is quite minimal. To implement anything of significance based on WAL events, WALActionsListener (at a minimum) is required. This is demonstrated by the implementation of the replication feature (not currently possible with coprocessors) and the corresponding interface exploitation that is the Side-Effect Processor. Consider promoting the interface of WALActionsListener into WALObserver. This goes a long way to being able refactor replication into a coprocessor. This also removes the duplicate code path for listeners because they're already available via coprocessor hook.

Issue Links

• is related to: HBASE-10504 Define Replication Interface