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https://issues.apache.org/jira/browse/HADOOP-2532?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12557439#action_12557439
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Bryan Duxbury commented on HADOOP-2532:
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+1 This should make my HBase cache patch much more efficient.
> Add to MapFile a getClosest that returns key that comes just-before if key
> not present (Currently does just-after only).
> ------------------------------------------------------------------------------------------------------------------------
>
> Key: HADOOP-2532
> URL: https://issues.apache.org/jira/browse/HADOOP-2532
> Project: Hadoop
> Issue Type: New Feature
> Reporter: stack
> Assignee: stack
> Priority: Minor
> Fix For: 0.16.0
>
> Attachments: getclosestbefore-v2.patch, getclosestbefore-v3.patch,
> getclosestbefore.patch
>
>
> The list of regions that make up a table in hbase are effectively kept in a
> mapfile. Regions are identified by the first row contained by that region.
> To find the region that contains a particular row, we need to be able to
> search the mapfile of regions to find the closest matching row that falls
> just-before the searched-for key rather than the just-after that is current
> mapfile getClosest behavior.
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