[jira] [Updated] (MAPREDUCE-5814) fat jar with *-default.xml may fail when mapreduce.job.classloader=true.

["Gera Shegalov (JIRA)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/MAPREDUCE-5814?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Gera Shegalov updated MAPREDUCE-5814:
-------------------------------------

    Attachment: MAPREDUCE-5814.v01.patch

v01 patch for review.

> fat jar with *-default.xml may fail when mapreduce.job.classloader=true.
> ------------------------------------------------------------------------
>
>                 Key: MAPREDUCE-5814
>                 URL: https://issues.apache.org/jira/browse/MAPREDUCE-5814
>             Project: Hadoop Map/Reduce
>          Issue Type: Bug
>          Components: mrv2
>    Affects Versions: 2.3.0
>            Reporter: Gera Shegalov
>         Attachments: MAPREDUCE-5814.v01.patch
>
>
> We faced a failure when a job.jar compiled against 0.20+ hadoop artifacts had to run with {{mapreduce.job.classloader=true}} because it needed a more recent guava as a dependency. The job failed because the cluster's {{*-default.xml}} files were overshadowed by the ones in the fat jar. We propose to treat these default config files like the system packages {{org.apache.hadoop.}} to avoid a counterintuitivie behavior as if we had {{mapreduce.job.user.classpath.first}} set.



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