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From "Alan Gates (JIRA)" <j...@apache.org>
Subject [jira] Created: (PIG-545) PERFORMANCE: Sampler for order bys does not produce a good distribution
Date Wed, 26 Nov 2008 00:52:44 GMT
PERFORMANCE: Sampler for order bys does not produce a good distribution
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                 Key: PIG-545
                 URL: https://issues.apache.org/jira/browse/PIG-545
             Project: Pig
          Issue Type: Bug
          Components: impl
    Affects Versions: types_branch
            Reporter: Alan Gates
             Fix For: types_branch


In running tests on actual data, I've noticed that the final reduce of an order by has skewed
partitions.  Some reduces finish in a few seconds while some run for 20 minutes.  Getting
a better distribution should lead to much better performance for order by.

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