Patrick Hunt created MAPREDUCE-4250:
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             Summary: hadoop-config.sh missing variable exports, causes Yarn 
jobs to fail with ClassNotFoundException MRAppMaster
                 Key: MAPREDUCE-4250
                 URL: https://issues.apache.org/jira/browse/MAPREDUCE-4250
             Project: Hadoop Map/Reduce
          Issue Type: Bug
          Components: nodemanager
            Reporter: Patrick Hunt
            Assignee: Patrick Hunt


This is the MR side of HADOOP-8393

If you start a pseudo distributed yarn using "start-yarn.sh" you need to 
specify exports for HADOOP_COMMON_HOME, HADOOP_HDFS_HOME, YARN_HOME, 
YARN_CONF_DIR, and HADOOP_MAPRED_HOME in hadoop-env.sh (or elsewhere), 
otherwise the spawned node manager will be missing 
these in it's environment. This is due to start-yarn using yarn-daemons. With 
this fix it's possible to start yarn (etc...) with only HADOOP_CONF_DIR 
specified in the environment. Took some time to track down this failure, so 
seems worthwhile to fix.

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