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https://issues.apache.org/jira/browse/HADOOP-2636?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12561371#action_12561371
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stack commented on HADOOP-2636:
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.bq [Copied from HADOOP-2674] ... size reported is the mapfile size. In
HADOOP-2636, it will be the size of the memcache.
For kicks, you might log both memcache size -- in bytes and count -- and
resultant log file size.
> [hbase] Make cache flush triggering less simplistic
> ---------------------------------------------------
>
> Key: HADOOP-2636
> URL: https://issues.apache.org/jira/browse/HADOOP-2636
> Project: Hadoop
> Issue Type: Improvement
> Components: contrib/hbase
> Reporter: stack
> Assignee: Jim Kellerman
> Priority: Minor
>
> When flusher runs -- its triggered when the sum of all Stores in a Region > a
> configurable max size -- we flush all Stores though a Store memcache might
> have but a few bytes.
> I would think Stores should only dump their memcache disk if they have some
> substance.
> The problem becomes more acute, the more families you have in a Region.
> Possible behaviors would be to dump the biggest Store only, or only those
> Stores > 50% of max memcache size. Behavior would vary dependent on the
> prompt that provoked the flush. Would also log why the flush is running:
> optional or > max size.
> This issue comes out of HADOOP-2621.
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