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https://issues.apache.org/jira/browse/HBASE-9507?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13819365#comment-13819365
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stack commented on HBASE-9507:
------------------------------

Ugh.  I don't think we can.  Deprecate in 0.96.  Remove in 0.98?

> 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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