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https://issues.apache.org/jira/browse/MAPREDUCE-5156?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13647751#comment-13647751
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Karthik Kambatla commented on MAPREDUCE-5156:
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+1. Not particular on it: the comment on the {{void driver}} should probably be
"API compatible with Hadoop 1.x"
> 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
>
>
> 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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