[hbase] When a get or scan request spans multiple columns, execute the reads in 
parallel
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                 Key: HADOOP-2039
                 URL: https://issues.apache.org/jira/browse/HADOOP-2039
             Project: Hadoop
          Issue Type: Improvement
          Components: contrib/hbase
    Affects Versions: 0.16.0
            Reporter: Jim Kellerman
            Assignee: Jim Kellerman
             Fix For: 0.16.0


When a get or scan request spans multiple columns, execute the reads in 
parallel and use a CountDownLatch to wait for them to complete before returning 
the results.

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