Github user radekg commented on a diff in the pull request: https://github.com/apache/spark/pull/9608#discussion_r48834671 --- Diff: core/src/main/scala/org/apache/spark/util/Utils.scala --- @@ -854,7 +854,8 @@ 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( --- End diff -- @tnachen writing from what I remember the issue here was, I can retest if necessary but it's a rather long process: `customHostname` comes from `SPARK_LOCAL_HOSTNAME `. When I was implementing this code, I tried setting the value of `SPARK_LOCAL_HOSTNAME ` to the same value as `SPARK_PUBLIC_DNS`. However, after getting to the `localHostNameForURI()` call, the `customHostname` value was no longer what I set `SPARK_LOCAL_HOSTNAME`. In other words, it has been changed by something from outside and I am not able to find it what happened. Let me ask a question: under what circumstances the user would like to set `SPARK_LOCAL_HOSTNAME` to a different value than `SPARK_PUBLIC_DNS `?
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