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From "Zhijie Shen (JIRA)" <j...@apache.org>
Subject [jira] [Updated] (MAPREDUCE-5459) Update the doc of running MRv1 examples jar on YARN
Date Wed, 14 Aug 2013 21:13:50 GMT

     [ https://issues.apache.org/jira/browse/MAPREDUCE-5459?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel

Zhijie Shen updated MAPREDUCE-5459:

    Status: Patch Available  (was: Open)
> Update the doc of running MRv1 examples jar on YARN
> ---------------------------------------------------
>                 Key: MAPREDUCE-5459
>                 URL: https://issues.apache.org/jira/browse/MAPREDUCE-5459
>             Project: Hadoop Map/Reduce
>          Issue Type: Bug
>            Reporter: Zhijie Shen
>            Assignee: Zhijie Shen
>         Attachments: MAPREDUCE-5459.1.patch
> In addition to adding two env vars: HADOOP_USER_CLASSPATH_FIRST and HADOOP_CLASSPATH,
we still need to add
> {code}
>     <property>
>         <name>mapreduce.job.user.classpath.first</name>
>         <value>true</value>
>     </property>
> {code}
> in mapred-site.xml to make sure that the MRv1 examples jar runs correctly on YARN. Some
examples will use Java reflection to find the classes in the examples jar dynamically when
they are running. With this configuration, the MRv1 examples jar will appear before the MRv2
examples jar in CLASSPATH of the processes in YARN containers. Therefore, the classes found
via reflection will be picked from MRv1 examples jar instead of MRv2 examples jar as well.
> MapReduce_Compatibility_Hadoop1_Hadoop2.apt.vm needs to be updated to document this.

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