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https://issues.apache.org/jira/browse/HBASE-7857?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13579356#comment-13579356
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Ted Yu commented on HBASE-7857:
-------------------------------
I do intend to work on this after wrapping up snapshots feature (in a
satisfiable way) and other high-priority 0.96 tasks.
>From Sergey
>(https://issues.apache.org/jira/browse/HBASE-7667?focusedCommentId=13578090&page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel#comment-13578090):
bq. My reasoning was - too many really tiny files, plus scope creep into
memstore.
>From Matt
>(https://issues.apache.org/jira/browse/HBASE-7667?focusedCommentId=13578090&page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel#comment-13578090):
bq. Gotcha. Agree about limiting scope.
So HBASE-7667 wouldn't touch non-compaction components (for the time being).
bq. We have lists now w/ thousands of regions and you would add a new layer of
subregions?
>From Jimmy's comment in HBASE-7667 @ 10/Feb/13 23:56:
bq. Stripes don't have overlapping keyrange with other stripes. So each stripe
is just like a sub-region.
We can discuss whether the concept of sub-region makes sense.
> Sub-region management
> ---------------------
>
> Key: HBASE-7857
> URL: https://issues.apache.org/jira/browse/HBASE-7857
> Project: HBase
> Issue Type: New Feature
> Reporter: Ted Yu
>
> Sub-region provides a light weight management below region level.
> Matt Corgan has a nice summary of the relationship between region size and
> number of regions on region server:
> https://issues.apache.org/jira/browse/HBASE-7667?focusedCommentId=13575024&page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel#comment-13575024
> HBASE-7667 proposed stripe compaction. However, to fully achieve fine-grained
> management, more components should participate:
> * memstore flush should ideally have knowledge about what makes stripe
> compaction work efficiently
> * we need to figure out where to store sub-region boundary information so
> that components have easy access. Boundary information should sustain after
> region moves from one server to another.
> Since HBASE-7667 focuses on compaction aspect, this JIRA discusses sub-region
> management in other components so that we better understand the benefits and
> complexities.
> User may want to see how sub-regions are shaped on web UI.
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