Github user jerryshao commented on the issue:
https://github.com/apache/spark/pull/17335
@yaooqinn , You only need one principal (for example principal
"f...@example.com") to get authentication from different services, the
configurations for hive and NN mentioned above is only for this two services,
it is not for user who submits Spark application.
For the user who launches Spark application, only `spark.yarn.principal`
could represent this user.
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