[jira] Commented: (HADOOP-3684) The data_join should allow the user to implement a customer cloning function

["Hadoop QA (JIRA)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/HADOOP-3684?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12610093#action_12610093 ] 

Hadoop QA commented on HADOOP-3684:
-----------------------------------

-1 overall.  Here are the results of testing the latest attachment 
  http://issues.apache.org/jira/secure/attachment/12385153/H-3684.txt
  against trunk revision 673517.

    +1 @author.  The patch does not contain any @author tags.

    -1 tests included.  The patch doesn't appear to include any new or modified tests.
                        Please justify why no tests are needed for this patch.

    -1 patch.  The patch command could not apply the patch.

Console output: http://hudson.zones.apache.org/hudson/job/Hadoop-Patch/2786/console

This message is automatically generated.

> 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: Bug
>          Components: mapred
>            Reporter: 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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