Linlin Zhou created YARN-6999:

             Summary: Add log about how to solve Error: Could not find or load 
main class
                 Key: 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
             Fix For: 3.0.0-beta1

According Setting up a Single Node Cluster 
 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, without suggestion on how to 
solve it. I want to add the useful suggestion in log.

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