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From "Ted Yu (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HBASE-4084) Auto-Split runs only if there are many store files per region
Date Mon, 11 Jul 2011 19:47:59 GMT

    [ https://issues.apache.org/jira/browse/HBASE-4084?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13063492#comment-13063492
] 

Ted Yu commented on HBASE-4084:
-------------------------------

I think HBASE-4081 is related to this ticket.
There was suggestion of removing the call to s.CheckSplit() in HBASE-4081.


> Auto-Split runs only if there are many store files per region
> -------------------------------------------------------------
>
>                 Key: HBASE-4084
>                 URL: https://issues.apache.org/jira/browse/HBASE-4084
>             Project: HBase
>          Issue Type: Bug
>          Components: regionserver
>    Affects Versions: 0.94.0
>            Reporter: John Heitmann
>
> Currently, MemStoreFlusher.flushRegion() is the driver of auto-splitting. It only decides
to auto-split a region if there are too many store files per region. Since it's not guaranteed
that the number of store files per region always grows above the "too many" count before compaction
reduces the count, there is no guarantee that auto-split will ever happen. In my test setup,
compaction seems to always win the race and I haven't noticed auto-splitting happen once.
> It appears that the intention is to have split be mutually exclusive with compaction,
and to have flushing be mutually exclusive with regions badly in need of compaction, but that
resulted in auto-splitting being nested in a too-restrictive spot.
> I'm not sure what the right fix is. Having one method that is essentially requestSplitOrCompact
would probably help readability, and could be the ultimate solution if it replaces other calls
of requestCompaction().

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