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Posted to dev@pig.apache.org by "Shravan Matthur Narayanamurthy (JIRA)" <ji...@apache.org> on 2009/02/05 13:23:59 UTC

[jira] Updated: (PIG-545) PERFORMANCE: Sampler for order bys does not produce a good distribution

     [ https://issues.apache.org/jira/browse/PIG-545?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Shravan Matthur Narayanamurthy updated PIG-545:
-----------------------------------------------

    Status: Patch Available  (was: Open)

> PERFORMANCE: Sampler for order bys does not produce a good distribution
> -----------------------------------------------------------------------
>
>                 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
>            Assignee: Amir Youssefi
>             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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