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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