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From "Pradeep Kamath (JIRA)" <j...@apache.org>
Subject [jira] Updated: (PIG-465) PERFORMANCE: removing keys from the value
Date Thu, 09 Oct 2008 00:33:44 GMT

     [ https://issues.apache.org/jira/browse/PIG-465?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Pradeep Kamath updated PIG-465:
-------------------------------

    Attachment: PIG-465.patch

> PERFORMANCE: removing keys from the value
> -----------------------------------------
>
>                 Key: PIG-465
>                 URL: https://issues.apache.org/jira/browse/PIG-465
>             Project: Pig
>          Issue Type: Improvement
>    Affects Versions: types_branch
>            Reporter: Olga Natkovich
>            Assignee: Pradeep Kamath
>             Fix For: types_branch
>
>         Attachments: PIG-465.patch
>
>
> Currently, reducers get the key data twice: once in the key and once in the value. If
grouping key is the large part of the value, this causes large data replication and performance
loss.
> The key should not be sent as part of the value. Instead, a metadata should used to assist
in reconstructing the row from the key and the remaining data

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