Github user tgravescs commented on a diff in the pull request: https://github.com/apache/spark/pull/18978#discussion_r134038075 --- Diff: resource-managers/yarn/src/main/scala/org/apache/spark/deploy/yarn/ApplicationMaster.scala --- @@ -749,8 +803,18 @@ private[spark] class ApplicationMaster( } +sealed trait ApplicationMasterMessage extends Serializable + +private [spark] object ApplicationMasterMessages { + + case class HelloWorld() extends ApplicationMasterMessage --- End diff -- remove, assume used for testing
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