vanzin commented on a change in pull request #23599: [SPARK-24793][K8s] Enhance 
spark-submit for app management
URL: https://github.com/apache/spark/pull/23599#discussion_r254863305
 
 

 ##########
 File path: core/src/main/scala/org/apache/spark/deploy/SparkSubmit.scala
 ##########
 @@ -1346,6 +1360,24 @@ private[spark] object SparkSubmitUtils {
     }
   }
 
+  private[deploy] def getSparkSubmitOperationsClient(master: String):
+    SparkSubmitOperationsClient = {
+    val loader = Utils.getContextOrSparkClassLoader
+    val serviceLoaders =
+      ServiceLoader.load(classOf[SparkSubmitOperationsClient], loader)
+        .asScala
+        .filter(_.isValid(master))
+    if (serviceLoaders.size > 1) {
+      throw new SparkException(
+        s"Multiple external SparkSubmitOperations clients registered.")
 
 Review comment:
   Include the master in the error message?

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