Github user LantaoJin commented on the issue:
https://github.com/apache/spark/pull/19933
Thanks your time to discuss so much with me @srowen. Like MapReduce does,
the submit host should be set automatically in submitting logical rather than
expecting Spark application owner to set. Almost application owners don't care
about it so they won't set it in configuration. But if it can be found in
WebUI, it would be very helpful to platform/infra team. So the code I
contributed
`sparkConf.set("spark.submit.hostname", Utils.localHostName)` in
SparkSubmit.scala has no side effect to application onwers.
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