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From "Akihiro Matsukawa (JIRA)" <j...@apache.org>
Subject [jira] [Updated] (PIG-3497) JobControlCompiler should only do reducer estimation when the job has a reduce phase
Date Thu, 03 Oct 2013 22:06:42 GMT

     [ https://issues.apache.org/jira/browse/PIG-3497?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Akihiro Matsukawa updated PIG-3497:
-----------------------------------

    Status: Patch Available  (was: Open)

> JobControlCompiler should only do reducer estimation when the job has a reduce phase
> ------------------------------------------------------------------------------------
>
>                 Key: PIG-3497
>                 URL: https://issues.apache.org/jira/browse/PIG-3497
>             Project: Pig
>          Issue Type: Bug
>            Reporter: Akihiro Matsukawa
>            Priority: Minor
>         Attachments: reducer_estimation.patch
>
>
> Currently, JobControlCompiler makes an estimation for the number of reducers required
(by default based on input size into mappers) regardless of whether there is a reduce phase
in the job. This is unnecessary, especially when running more complex custom reducer estimators.

> Change to only estimate reducers when necessary.



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