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https://issues.apache.org/jira/browse/HBASE-2247?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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stack resolved HBASE-2247.
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Resolution: Fixed
Recently added short scan does this. Resolving as fixed.
> [performance] Small scans should run like a random-read
> -------------------------------------------------------
>
> Key: HBASE-2247
> URL: https://issues.apache.org/jira/browse/HBASE-2247
> Project: HBase
> Issue Type: Improvement
> Components: Performance
> Reporter: stack
>
> hbase-2180 added pread whenever we do a get -- random-read -- and kept the
> old sync+position+read for when scanning. In between is the case of small
> scans. Small scans of 0-100 or so rows where the cells are small will likely
> fit a single hfile blocksize, especially if its the default 64k. We should
> recognize small scans and flip to random-read to satisfy (somehow). It'll up
> the performance a bit.
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