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Posted to dev@pig.apache.org by "Rohini Palaniswamy (JIRA)" <ji...@apache.org> on 2016/02/10 17:13:18 UTC

[jira] [Updated] (PIG-4802) Autoparallelism should estimate less when there is combiner

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

Rohini Palaniswamy updated PIG-4802:
------------------------------------
    Status: Patch Available  (was: Open)

> 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
>
>
>   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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