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From "Namit Jain (JIRA)" <j...@apache.org>
Subject [jira] Created: (HIVE-1248) better tuning for number of reducers
Date Tue, 16 Mar 2010 21:21:27 GMT
better tuning for number of reducers
------------------------------------

                 Key: HIVE-1248
                 URL: https://issues.apache.org/jira/browse/HIVE-1248
             Project: Hadoop Hive
          Issue Type: Improvement
          Components: Query Processor
            Reporter: Namit Jain
             Fix For: 0.6.0


Currently, the following parameter:    BYTESPERREDUCER("hive.exec.reducers.bytes.per.reducer",
(long) (1000 * 1000 * 1000)),

decides the number of reducers for a given query - it is same for all map-reduce jobs of the
query. It would be good to give more flexibility to the
user, and provide a way so that they can determine number of reducers for each map-reduce
job


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