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From "Luke Lu (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (MAPREDUCE-1938) Ability for having user's classes take precedence over the system classes for tasks' classpath
Date Tue, 19 Mar 2013 17:47:17 GMT

    [ https://issues.apache.org/jira/browse/MAPREDUCE-1938?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13606578#comment-13606578
] 

Luke Lu commented on MAPREDUCE-1938:
------------------------------------

This is option is no longer needed after MAPREDUCE-1700 (except for very rare cases where
you want to implement your own classloader).
                
> Ability for having user's classes take precedence over the system classes for tasks'
classpath
> ----------------------------------------------------------------------------------------------
>
>                 Key: MAPREDUCE-1938
>                 URL: https://issues.apache.org/jira/browse/MAPREDUCE-1938
>             Project: Hadoop Map/Reduce
>          Issue Type: New Feature
>          Components: job submission, task, tasktracker
>            Reporter: Devaraj Das
>            Assignee: Krishna Ramachandran
>            Priority: Blocker
>             Fix For: 0.20.204.0, 0.23.0
>
>         Attachments: mapred-1938-1, mapred-1938-2.patch, mapred-1938-3.patch, mr-1938-bp20.1.patch,
mr-1938-bp20.patch
>
>
> It would be nice to have the ability in MapReduce to allow users to specify for their
jobs alternate implementations of classes that are already defined in the MapReduce libraries.
For example, an alternate implementation for CombineFileInputFormat. 

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