You are viewing a plain text version of this content. The canonical link for it is here.
Posted to mapreduce-issues@hadoop.apache.org by "Harsh J (JIRA)" <ji...@apache.org> on 2013/03/19 17:55:16 UTC
[jira] [Commented] (MAPREDUCE-1938) Ability for having user's
classes take precedence over the system classes for tasks' classpath
[ https://issues.apache.org/jira/browse/MAPREDUCE-1938?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13606502#comment-13606502 ]
Harsh J commented on MAPREDUCE-1938:
------------------------------------
bq. Not relevant for MR2.
Apparently is still relevant for MR2:
./hadoop-mapreduce-client-common/src/main/java/org/apache/hadoop/mapreduce/v2/util/MRApps.java utilizes it to setup proper classpath structures.
If your comment meant some other form of relevancy, please do clarify. In any case, this is present as "mapreduce.job.user.classpath.first" in MR2 :)
> 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.
--
This message is automatically generated by JIRA.
If you think it was sent incorrectly, please contact your JIRA administrators
For more information on JIRA, see: http://www.atlassian.com/software/jira