Linlin Zhou updated YARN-6999:
    Attachment: yarn-6999.patch

> Add log about how to solve Error: Could not find or load main class 
> org.apache.hadoop.mapreduce.v2.app.MRAppMaster
> ------------------------------------------------------------------------------------------------------------------
>                 Key: YARN-6999
>                 URL: https://issues.apache.org/jira/browse/YARN-6999
>             Project: Hadoop YARN
>          Issue Type: Improvement
>          Components: documentation, security
>    Affects Versions: 3.0.0-beta1
>         Environment: All operating systems.
>            Reporter: Linlin Zhou
>            Priority: Minor
>              Labels: beginner
>             Fix For: 3.0.0-beta1
>         Attachments: yarn-6999.patch
>   Original Estimate: 1h
>  Remaining Estimate: 1h
> According Setting up a Single Node Cluster 
> [https://hadoop.apache.org/docs/stable/hadoop-project-dist/hadoop-common/SingleCluster.html],
>  we would still failed to run the MapReduce job example. Due to a security 
> fix, yarn use user's environment variables to init, and user's environment 
> variable usually doesn't include MapReduce related settings. So we need to 
> add the related config in etc/hadoop/mapred-site.xml manually. Currently the 
> log only tells there is an Error:
> Could not find or load main class 
> org.apache.hadoop.mapreduce.v2.app.MRAppMaster, without suggestion on how to 
> solve it. I want to add the useful suggestion in log.

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