Nan Zhu created SPARK-2404:
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             Summary: spark-submit and spark-class may overwrite the already 
defined SPARK_HOME
                 Key: SPARK-2404
                 URL: https://issues.apache.org/jira/browse/SPARK-2404
             Project: Spark
          Issue Type: Bug
    Affects Versions: 1.0.0
            Reporter: Nan Zhu
             Fix For: 1.0.1


in spark-class and spark-submit 

the SPARK_HOME is set to the present working directory, causing the value of 
already defined SPARK_HOME being overwritten 

we should not overwrite that if SPARK_HOME has been defined



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