Github user steveloughran commented on a diff in the pull request:
https://github.com/apache/spark/pull/9608#discussion_r44539552
--- 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 --
sorry, not got much insight there, except failing fast on "" is good. It
should really be the job of the code downstream to recognise and react to the
usual config problems of trying to listen on an invalid hostname or port 0
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