Need to sort on more than the primary key
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                 Key: HADOOP-531
                 URL: http://issues.apache.org/jira/browse/HADOOP-531
             Project: Hadoop
          Issue Type: Improvement
          Components: contrib/streaming
    Affects Versions: 0.5.0
            Reporter: Richard Kasperski


There are many tasks where I need to have finer control over the ordering in 
the reduce than a sort on a single key provides. Most of these situations arise 
when a merge two sources of data and am attaching a single instance of one 
source to multiple instances of a second source. I know that I can read all the 
the records with a single key. It's possible that there might be many millions 
of these making memory demands that cannot be satisfied.

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