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From "Shravan Matthur Narayanamurthy (JIRA)" <j...@apache.org>
Subject [jira] Commented: (PIG-545) PERFORMANCE: Sampler for order bys does not produce a good distribution
Date Fri, 06 Feb 2009 18:01:59 GMT

    [ https://issues.apache.org/jira/browse/PIG-545?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12671222#action_12671222
] 

Shravan Matthur Narayanamurthy commented on PIG-545:
----------------------------------------------------

It worked with the changes to sort. It produced an even distribution and took about 3 mins
lesser. There is still a slight tuning to be done as the first partition is not getting enough
data. I will try to tweak it a bit and check if its better than the current one.

> 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: Pradeep Kamath
>             Fix For: types_branch
>
>         Attachments: WRP.patch
>
>
> 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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