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From "Dmitriy V. Ryaboy (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (PIG-2652) Skew join and order by don't trigger reducer estimation
Date Sat, 28 Apr 2012 00:24:49 GMT

    [ https://issues.apache.org/jira/browse/PIG-2652?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13264152#comment-13264152
] 

Dmitriy V. Ryaboy commented on PIG-2652:
----------------------------------------

Created PIG-2675.
I am not sure I want to commit to doing that as a blocker for 0.10.1. It's a very small job,
there are more fundamental improvements to be had for the same amount of effort, I think.
But we should still do it at some point.
                
> Skew join and order by don't trigger reducer estimation
> -------------------------------------------------------
>
>                 Key: PIG-2652
>                 URL: https://issues.apache.org/jira/browse/PIG-2652
>             Project: Pig
>          Issue Type: Bug
>            Reporter: Bill Graham
>            Assignee: Dmitriy V. Ryaboy
>             Fix For: 0.9.3, 0.11, 0.10.1
>
>         Attachments: PIG-2652_1.patch, PIG-2652_2.patch, PIG-2652_3.patch, PIG-2652_3_10.patch,
PIG-2652_4.patch, PIG-2652_5.patch, PIG-2652_6.patch, PIG-2652_7.patch
>
>
> If neither PARALLEL, default parallel or {{mapred.reduce.tasks}} are set, the number
of reducers is not estimated based on input size for skew joins or order by. Instead, these
jobs get only 1 reducer.

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