Github user yaooqinn commented on the issue:
https://github.com/apache/spark/pull/19121
@jerryshao
1. I didn't meet any problems, these codes are ok to run even if it is
unnecessary.
2. In Standalone mode, if collaborating with a secured hdfs, we might
haven't support yet. Besidesï¼this ugi `doAs` wraps executors' initialization
but not tasks running, if we truly want to `doAs` a `SPARK_USER`, this ugi may
be used in both phases.
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