Github user jerryshao commented on the issue:
https://github.com/apache/spark/pull/19121
UGI is only used for security, normally it is used for Spark application to
communicate with Hadoop using correct user.
doAs already wraps the whole `CoarseGrainedExecutorBackend` process, all
the task threads forked in this process will honor this UGI, don't need to wrap
again on each task.
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