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From "Amareshwari Sriramadasu (JIRA)" <j...@apache.org>
Subject [jira] Updated: (MAPREDUCE-1938) Ability for having user's classes take precedence over the system classes for tasks' classpath
Date Thu, 02 Sep 2010 08:34:55 GMT

     [ https://issues.apache.org/jira/browse/MAPREDUCE-1938?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Amareshwari Sriramadasu updated MAPREDUCE-1938:
-----------------------------------------------

    Status: Open  (was: Patch Available)

bq. As for moving to MRJobConfig, based on discussions, my understanding is, desired to have
this flag semi-private (MRJobConfig i believe is very public).
MRJobConfig is the place to hold all job-level config paramaters. And it is not public. Annotation
says "private, evolving". So, the configuration should be in MRJobConfig. Also, the name should
say mapreduce.job.user.classpath.first saying it is a job level property.
Also, in your next patch, can you do the changes in test-case suggested by Luke?

Are you planning to raise a Hadoop-common jira for the changes in bin/hadoop script?

> 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
>             Fix For: 0.22.0
>
>         Attachments: mapred-1938-1, mapred-1938-2.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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