Github user zjffdu commented on the issue:
https://github.com/apache/spark/pull/14694
@vanzin Spark thrift server needs to access hive metastore principal which
is a service principal in secured mode. Besides that I think there's another
possibility that user might develop a custom service based on spark, in this
case they also need service principal.
And `SecurityUtil.getServerPrincipal` will only replace _HOST in the patter
of `x/_HOST@domain`, so I think it is safe to apply it globally.
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