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https://issues.apache.org/jira/browse/HBASE-2462?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12923181#action_12923181
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stack commented on HBASE-2462:
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Looking at production regionserver compacting with J-D, we're just doing too
much compacting. Its running near back-to-back. Need to fix. Our default
compaction trips and count of files seems too little. Also, it looks like
we'll merrily go ahead and compact together a 10MB file with a 1G file; we need
to have in place barriers to this ever happening. This issue is important to
fix.. but yeah, 0.92.
> Review compaction heuristic and move compaction code out so standalone and
> independently testable
> -------------------------------------------------------------------------------------------------
>
> Key: HBASE-2462
> URL: https://issues.apache.org/jira/browse/HBASE-2462
> Project: HBase
> Issue Type: Improvement
> Reporter: stack
> Priority: Critical
>
> Anything that improves our i/o profile makes hbase run smoother. Over in
> HBASE-2457, good work has been done already describing the tension between
> minimizing compactions versus minimizing count of store files. This issue is
> about following on from what has been done in 2457 but also, breaking the
> hard-to-read compaction code out of Store.java out to a standalone class that
> can be the easier tested (and easily analyzed for its performance
> characteristics).
> If possible, in the refactor, we'd allow specification of alternate merge
> sort implementations.
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