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https://issues.apache.org/jira/browse/HBASE-3842?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13027795#comment-13027795
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stack commented on HBASE-3842:
------------------------------

I like passing CompactionRequest notion (and it gives you access to Store if 
you need it).

You could do an Interface to narrow what CPs can access.  There may be 
concurrency/perf reasons for not letting CPs have direct access. 

I have no strong opinion on it N.

> Refactor Coprocessor Compaction API
> -----------------------------------
>
>                 Key: HBASE-3842
>                 URL: https://issues.apache.org/jira/browse/HBASE-3842
>             Project: HBase
>          Issue Type: Improvement
>          Components: coprocessors, regionserver
>    Affects Versions: 0.92.0
>            Reporter: Nicolas Spiegelberg
>            Assignee: Nicolas Spiegelberg
>            Priority: Minor
>              Labels: compaction
>             Fix For: 0.92.0
>
>
> After HBASE-3797, the compaction logic flow has been significantly altered.  
> Because of this, the current compaction coprocessor API is insufficient for 
> gaining full insight into compaction requests/results.  Refactor coprocessor 
> API after HBASE-3797 is committed to be more extensible and increase 
> visibility.

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