Github user liyinan926 commented on a diff in the pull request: https://github.com/apache/spark/pull/19717#discussion_r155038714 --- Diff: core/src/main/scala/org/apache/spark/util/Utils.scala --- @@ -2744,6 +2744,25 @@ private[spark] object Utils extends Logging { } } + /** + * Check the validity of the given Kubernetes master URL and return the resolved URL. + */ + def checkAndGetK8sMasterUrl(rawMasterURL: String): String = { + require(rawMasterURL.startsWith("k8s://"), + "Kubernetes master URL must start with k8s://.") + val masterWithoutK8sPrefix = rawMasterURL.substring("k8s://".length) --- End diff -- With the changes, URLs like `k8s://host:port` is no longer valid as the part `host:port` is parsed as a URI with a `host` scheme. Instead, `k8s:///host:port` should be used. I'm not super familiar with URIs, so I'm not sure if this is desirable. /cc @mccheah @foxish.
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