Linlin Zhou created YARN-6999:
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Summary: 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
Fix For: 3.0.0-beta1
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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