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https://issues.apache.org/jira/browse/YARN-6999?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16134279#comment-16134279
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Linlin Zhou commented on YARN-6999:
-----------------------------------
Thank you very much for your nice suggestions @ [~gtCarrera9]. I thought it
yesterday and today but still can't figure out a good solution to solve this
problem without hard-coding. I add a new patch in which I extract the new
suggestion log in a separate method which maybe better for extension in the
future.
> 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
> Assignee: Linlin Zhou
> Priority: Minor
> Labels: beginner
> Fix For: 3.0.0-beta1
>
> Attachments: yarn-6999.patch, yarn-6999.patch.002
>
> 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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