Nick Dimiduk created HBASE-9507:
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             Summary: Promote methods of WALActionsListener to WALObserver
                 Key: HBASE-9507
                 URL: https://issues.apache.org/jira/browse/HBASE-9507
             Project: HBase
          Issue Type: Brainstorming
          Components: Coprocessors, wal
            Reporter: Nick Dimiduk
            Priority: Minor


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|https://github.com/NGDATA/hbase-indexer/tree/master/hbase-sep]. 
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.

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