Github user yaooqinn commented on the issue:

    https://github.com/apache/spark/pull/19121
  
    @jerryshao  thanks for replying
    
    if a user  explicitly set `SPARK_USER` but not wrapping the `SPARK_USER` 
UGI doAs for SparkContext initialization, there might be two different users  
communicating with Hadoop in driver and executors.


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