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https://issues.apache.org/jira/browse/HBASE-69?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12568219#action_12568219
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stack commented on HBASE-69:
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Why when only one store, blocking is disabled? (Whats to stop update rate from
overwhelming flusher in one-store case?)
> [hbase] Make cache flush triggering less simplistic
> ---------------------------------------------------
>
> Key: HBASE-69
> URL: https://issues.apache.org/jira/browse/HBASE-69
> Project: Hadoop HBase
> Issue Type: Improvement
> Components: regionserver
> Reporter: stack
> Assignee: Jim Kellerman
> Fix For: 0.2.0
>
> Attachments: patch.txt, patch.txt, patch.txt, patch.txt, patch.txt,
> patch.txt, patch.txt, patch.txt, patch.txt, patch.txt, patch.txt, patch.txt
>
>
> 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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