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https://issues.apache.org/jira/browse/HBASE-3160?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12927694#action_12927694
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Jeff Whiting commented on HBASE-3160:
-------------------------------------
Nicholas you mentioned in the jira that "Note that we also found/fixed a major
compaction downgrade bug while writing this code." Being the primary author of
HBASE-2646 which added the priority compaction queue, I'm interested in knowing
what the bug was! So what was the bug? And what was your fix?
I like the improvement and especially how it makes it much more granular in who
should get priority.
> Compactions: Use more intelligent priorities for PriorityCompactionQueue
> ------------------------------------------------------------------------
>
> Key: HBASE-3160
> URL: https://issues.apache.org/jira/browse/HBASE-3160
> Project: HBase
> Issue Type: Improvement
> Affects Versions: 0.89.20100924, 0.90.0
> Reporter: Nicolas Spiegelberg
> Assignee: Nicolas Spiegelberg
> Fix For: 0.90.0
>
> Attachments: HBASE-3160.patch
>
>
> One of the problems with the current compaction queue is that we have a very
> low granularity on the importance of the various compactions in the queue.
> If a StoreFile count exceeds 15 files, only then do we bump via enum change.
> We should instead look into more intelligent, granular priority metrics for
> choosing the next compaction.
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