[
https://issues.apache.org/jira/browse/MAPREDUCE-1938?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12972174#action_12972174
]
Owen O'Malley commented on MAPREDUCE-1938:
------------------------------------------
Alejandro, you are viewing this wrong. Of course the user shouldn't
deliberately make conflicts without understanding the problem. This is about
providing control to the user so that they can upgrade (or hotfix) a jar file
for their job without installing it on the cluster.
I would suggest that the default should be user jars and then the framework
jars with a compatibility switch for backwards compatibility.
> 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: 0.22.0
>
> 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.
--
This message is automatically generated by JIRA.
-
You can reply to this email to add a comment to the issue online.
