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From "Hudson (JIRA)" <j...@apache.org>
Subject [jira] Commented: (HADOOP-3684) The data_join should allow the user to implement a customer cloning function
Date Fri, 22 Aug 2008 12:34:54 GMT

    [ https://issues.apache.org/jira/browse/HADOOP-3684?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12624794#action_12624794
] 

Hudson commented on HADOOP-3684:
--------------------------------

Integrated in Hadoop-trunk #581 (See [http://hudson.zones.apache.org/hudson/job/Hadoop-trunk/581/])

> The data_join should allow the user to implement a customer cloning function
> ----------------------------------------------------------------------------
>
>                 Key: HADOOP-3684
>                 URL: https://issues.apache.org/jira/browse/HADOOP-3684
>             Project: Hadoop Core
>          Issue Type: Improvement
>          Components: mapred
>            Reporter: Runping Qi
>            Assignee: Runping Qi
>             Fix For: 0.19.0
>
>         Attachments: H-3684.txt
>
>
> Currently, the framework uses serialization/deserialization to clone the values passed
to the resuce function.
> This amounts to a very heavy weight deep copy of the value objects.
> That is way too expensive. Although that may be a generic way to work for all possible
value classes, thus good as a default way,
> the framework should allow the user to implemet an application specific yet efficient
cloning function.
>  

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