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From "Daniel Dai (JIRA)" <j...@apache.org>
Subject [jira] Updated: (PIG-364) Limit return incorrect records when we use multiple reducer
Date Sun, 14 Sep 2008 04:37:44 GMT

     [ https://issues.apache.org/jira/browse/PIG-364?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Daniel Dai updated PIG-364:
---------------------------

    Attachment: PIG-364-2.patch

The new patch add a MRPlan visitor after compiling. For each MapReduceOper, if it contains
limit and requestedParallelism>1, insert a MapReduceOper after it with 1 reducer.

> Limit return incorrect records when we use multiple reducer
> -----------------------------------------------------------
>
>                 Key: PIG-364
>                 URL: https://issues.apache.org/jira/browse/PIG-364
>             Project: Pig
>          Issue Type: Bug
>          Components: impl
>    Affects Versions: types_branch
>            Reporter: Daniel Dai
>            Assignee: Daniel Dai
>             Fix For: types_branch
>
>         Attachments: PIG-364-2.patch, PIG-364.patch
>
>
> Currently we put Limit(k) operator in the reducer plan. However, in the case of n reducer,
we will get up to n*k output. 

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