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https://issues.apache.org/jira/browse/HADOOP-2139?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel#action_12540639
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Jim Kellerman commented on HADOOP-2139:
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Yes, the accounting on a per column basis will get more complicated, but I
think the improved parallelism will be worth it.
> [hbase] Increase parallelism in region servers
> ----------------------------------------------
>
> Key: HADOOP-2139
> URL: https://issues.apache.org/jira/browse/HADOOP-2139
> Project: Hadoop
> Issue Type: Improvement
> Components: contrib/hbase
> Affects Versions: 0.16.0
> Reporter: Jim Kellerman
> Assignee: Jim Kellerman
> Fix For: 0.16.0
>
>
> There are a number of paths in the region server which block against one
> another including:
> - log rolling
> - cache flushes
> - region splitting
> - updates
> - scanners
> Investigate which can proceed in parallel and mechanisms for making some
> operations that currently do not run in parallel.
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