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https://issues.apache.org/jira/browse/YARN-6999?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16140353#comment-16140353
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Li Lu commented on YARN-6999:
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This looks much better, thanks for the work [~littlestone00]! Could you please
rename the patch to .patch so that we can rerun Jenkins again? Also, the
concerns raised by checkstyle appears to be valid, could you please fix that as
well? The warning from findbugs appears to be irrelevant, so let's focus on
checkstyle and whitespaces first.
> 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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