Add to MapFile a getClosest that returns key that comes just-before if key not
present (Currently does just-after only).
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Key: HADOOP-2532
URL: https://issues.apache.org/jira/browse/HADOOP-2532
Project: Hadoop
Issue Type: New Feature
Reporter: stack
Priority: Minor
Attachments: 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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