Github user tejasapatil commented on a diff in the pull request:
https://github.com/apache/spark/pull/11723#discussion_r57276135
--- Diff: core/src/main/scala/org/apache/spark/SparkContext.scala ---
@@ -2443,8 +2443,34 @@ object SparkContext extends Logging {
"in the form mesos://zk://host:port. Current Master URL will
stop working in Spark 2.0.")
createTaskScheduler(sc, "mesos://" + zkUrl, deployMode)
- case _ =>
- throw new SparkException("Could not parse Master URL: '" + master
+ "'")
+ case masterUrl =>
+ val cm = getClusterManager(masterUrl) match {
+ case Some(clusterMgr) => clusterMgr
+ case None => throw new SparkException("Could not parse Master
URL: '" + master + "'")
+ }
+ try {
+ val scheduler = cm.createTaskScheduler(sc)
+ val backend = cm.createSchedulerBackend(sc, scheduler)
+ cm.initialize(scheduler, backend)
+ (backend, scheduler)
+ } catch {
+ case e: Exception => {
+ throw new SparkException("External scheduler cannot be
instantiated", e)
+ }
+ }
+ }
+ }
+
+ private def getClusterManager(url: String):
Option[ExternalClusterManager] = {
+ val loader = Utils.getContextOrSparkClassLoader
+ val serviceLoader =
ServiceLoader.load(classOf[ExternalClusterManager], loader)
+
+ serviceLoader.asScala.filter(_.canCreate(url)).toList match {
+ // exactly one registered manager
+ case head :: Nil => Some(head)
+ case Nil => None
+ case multipleMgrs => sys.error(s"Multiple Cluster Managers
registered " +
--- End diff --
Can you include the list of matching cluster managers in the message ?
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