Github user sryza commented on a diff in the pull request:
https://github.com/apache/spark/pull/8072#discussion_r36708654
--- Diff: yarn/src/main/scala/org/apache/spark/deploy/yarn/Client.scala ---
@@ -163,6 +163,23 @@ private[spark] class Client(
appContext.setQueue(args.amQueue)
appContext.setAMContainerSpec(containerContext)
appContext.setApplicationType("SPARK")
+ sparkConf.getOption(CONF_SPARK_YARN_APPLICATION_TAGS)
+ .map(StringUtils.getTrimmedStringCollection(_))
+ .filter(!_.isEmpty())
+ .foreach { tagCollection =>
+ try {
+ val method = appContext.getClass().getMethod(
--- End diff --
Add a comment here mentioning why this needs to be called via reflection
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