Chester created SPARK-3177:
------------------------------

             Summary: Yarn-alpha ClientBaseSuite Unit test failed
                 Key: SPARK-3177
                 URL: https://issues.apache.org/jira/browse/SPARK-3177
             Project: Spark
          Issue Type: Bug
          Components: YARN
    Affects Versions: 1.1.1
            Reporter: Chester
            Priority: Minor
             Fix For: 1.1.1


Yarn-alpha ClientBaseSuite Unit test failed due to differences of MRJobConfig 
API between yarn-stable and yarn-alpha. 

The class field
MRJobConfig.DEFAULT_MAPREDUCE_APPLICATION_CLASSPATH 

in yarn-alpha 
returns String Array

in yarn 
returns String 

the method will works for yarn-stable but will fail as it try to cast String 
Array to String. 

val knownDefMRAppCP: Seq[String] =
     getFieldValue[String, Seq[String]](classOf[MRJobConfig],
"DEFAULT_MAPREDUCE_APPLICATION_CLASSPATH",
                                         Seq[String]())(a => a.split(","))




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