Github user haiy commented on the pull request:

    https://github.com/apache/spark/pull/6120#issuecomment-101855540
  
    BTW, what's the difference between the SparkConf.getAppId and 
SparkContext.applicationId?When we want to get the appId through the SparkConf 
in yarn cluster mode, actually it will throw an excepiton,  cause this property 
is not set.


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