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https://issues.apache.org/jira/browse/MAPREDUCE-1938?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Devaraj Das updated MAPREDUCE-1938:
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Attachment: mr-1938-bp20.patch
Patch for Y20. Not for commit here.
The patch defines a configuration option using which users can specify that the
system classpath be added last in the list of classpaths created before
launching a task. It also introduces a HADOOP_CLIENT_CLASSPATH env variable in
the hadoop shell script that should be set to point to the user's jar/classpath
(containing his implementation of the system classes) before submitting a job
over command line.
> 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: 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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