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From "Rohini Palaniswamy (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (PIG-3648) Make the sample size for RandomSampleLoader configurable
Date Tue, 07 Jan 2014 01:05:50 GMT

    [ https://issues.apache.org/jira/browse/PIG-3648?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13863749#comment-13863749
] 

Rohini Palaniswamy commented on PIG-3648:
-----------------------------------------

Is memory a big concern really w.r.t to number of samples? I haven't checked but I am assuming
we will only have the orderby key in the sample and not entire tuple and that would not amount
to much in terms of occupying memory. Is that wrong?

> Make the sample size for RandomSampleLoader configurable
> --------------------------------------------------------
>
>                 Key: PIG-3648
>                 URL: https://issues.apache.org/jira/browse/PIG-3648
>             Project: Pig
>          Issue Type: Improvement
>          Components: impl
>            Reporter: Cheolsoo Park
>            Assignee: Cheolsoo Park
>            Priority: Minor
>             Fix For: 0.13.0
>
>         Attachments: PIG-3648-1.patch
>
>
> Pig uses RandomSampleLoader for range partitioning in order-by. But since the sample
size is hardcoded as 100, volatility in the variance of the results  increases when sorting
a large number of rows (e.g. 10M+ per task).
> It would be nice if the sample size could be configurable via Pig properties.



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