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https://issues.apache.org/jira/browse/MAPREDUCE-5156?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13648626#comment-13648626
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Zhijie Shen commented on MAPREDUCE-5156:
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{quote}
In addition, the user would have to run a previous examples jar with
HADOOP_USER_CLASSPATH_FIRST=true and HADOOP_CLASSPATH set to their examples jar
to see the incompatibility, otherwise it ends up picking up the 2.x versions
and works
{quote}
Yes, I've noticed this issue when I investigated the problem. Otherwise, we can
simply move 2.x examples jar outside CLASSPATH. Maybe we should document it
MAPREDUCE-5184?
> Hadoop-examples-1.x.x.jar cannot run on Yarn
> --------------------------------------------
>
> Key: MAPREDUCE-5156
> URL: https://issues.apache.org/jira/browse/MAPREDUCE-5156
> Project: Hadoop Map/Reduce
> Issue Type: Sub-task
> Reporter: Zhijie Shen
> Assignee: Zhijie Shen
> Priority: Blocker
> Attachments: MAPREDUCE-5156.1.patch, MAPREDUCE-5156.2.patch
>
>
> M/R examples are run through ProgramDriver.driver. ProgramDriver.driver
> returns void in hadoop-1, while it returns int in hadoop-2. Therefore, the
> function signatures in the example jar and yarn are incompatible.
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