Github user ajbozarth commented on a diff in the pull request: https://github.com/apache/spark/pull/13950#discussion_r68842668 --- Diff: core/src/main/scala/org/apache/spark/deploy/master/Master.scala --- @@ -127,7 +128,14 @@ private[deploy] class Master( logInfo(s"Running Spark version ${org.apache.spark.SPARK_VERSION}") webUi = new MasterWebUI(this, webUiPort) webUi.bind() - masterWebUiUrl = "http://" + masterPublicAddress + ":" + webUi.boundPort + if (reverseProxy) { + masterWebUiUrl = conf.get("spark.ui.reverseProxyUrl", null) + if (masterWebUiUrl == null) { + throw new SparkException("spark.ui.reverseProxyUrl must be provided") --- End diff -- When this is thrown the Spark Master still starts, but workings and applications can't connect to it.
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