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From "Richard Kasperski (JIRA)" <j...@apache.org>
Subject [jira] Created: (HADOOP-531) Need to sort on more than the primary key
Date Wed, 13 Sep 2006 21:45:22 GMT
Need to sort on more than the primary key
-----------------------------------------

                 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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