Github user radekg commented on a diff in the pull request: https://github.com/apache/spark/pull/9608#discussion_r44563045 --- Diff: core/src/main/scala/org/apache/spark/util/Utils.scala --- @@ -810,7 +810,7 @@ private[spark] object Utils extends Logging { * Get the local machine's URI. */ def localHostNameForURI(): String = { - customHostname.getOrElse(InetAddresses.toUriString(localIpAddress)) + sys.env.get("SPARK_PUBLIC_DNS").getOrElse( customHostname.getOrElse(InetAddresses.toUriString(localIpAddress)) ) --- End diff -- However, I'll double check this and, if it works reliably with `SPARK_LOCAL_HOSTNAME`, remove this bit.
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