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From "Rohini Palaniswamy (JIRA)" <j...@apache.org>
Subject [jira] [Updated] (PIG-4802) Autoparallelism should estimate less when there is combiner
Date Wed, 10 Feb 2016 20:23:18 GMT

     [ https://issues.apache.org/jira/browse/PIG-4802?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel

Rohini Palaniswamy updated PIG-4802:
    Attachment: PIG-4802-2.patch

bq. Can we retain the simple version: getParallelismFactor()
  It is not used anywhere else. So removed it.

Added more comments as documentation. Also added a TODO item for further enhancements and
filed PIG-4805 for that.

> Autoparallelism should estimate less when there is combiner
> -----------------------------------------------------------
>                 Key: PIG-4802
>                 URL: https://issues.apache.org/jira/browse/PIG-4802
>             Project: Pig
>          Issue Type: Improvement
>            Reporter: Rohini Palaniswamy
>            Assignee: Rohini Palaniswamy
>             Fix For: 0.16.0
>         Attachments: PIG-4802-1.patch, PIG-4802-2.patch
>   When there is a combiner, it reduces records by a lot. Auto-parallelism should take
that into account. 
>   Also currently we multiply by a factor of 10 if there is any FLATTEN. Users usually
have FLATTEN(group) when the group by key is a compound key and it ends up estimating high.
Only FLATTEN of bag should be considered.

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