Github user jerryshao commented on the issue:
https://github.com/apache/spark/pull/19227
The purpose of changing configuration name is that these configurations are
not only used by yarn mode in `SparkSubmit`, Mesos, local will also honor this,
so that's why I rename them. What do you think?
Regarding "impersonate the user you stole the delegation tokens from", yes,
it is possible, but I do see Spark on Mesos also uses the same approach, does
it also has same issue?
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