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Posted to dev@hive.apache.org by "Navis (JIRA)" <ji...@apache.org> on 2012/12/28 02:40:12 UTC

[jira] [Created] (HIVE-3841) Sampling in previous MR for range partitioning of next RS

Navis created HIVE-3841:
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             Summary: Sampling in previous MR for range partitioning of next RS
                 Key: HIVE-3841
                 URL: https://issues.apache.org/jira/browse/HIVE-3841
             Project: Hive
          Issue Type: Improvement
          Components: Query Processor
            Reporter: Navis
            Assignee: Navis
            Priority: Minor


Currently hive enforces single reducer for order by clause, which can be performance bottleneck. 

If sampling could be done on ordering key at previous MR stage, multiple reducers could be assigned for it.

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