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From "Nick Dimiduk (JIRA)" <j...@apache.org>
Subject [jira] [Created] (HBASE-9507) Promote methods of WALActionsListener to WALObserver
Date Wed, 11 Sep 2013 19:46:53 GMT
Nick Dimiduk created HBASE-9507:
-----------------------------------

             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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