Github user vanzin commented on a diff in the pull request:
https://github.com/apache/spark/pull/21635#discussion_r197975990
--- Diff:
resource-managers/yarn/src/main/scala/org/apache/spark/deploy/yarn/ApplicationMaster.scala
---
@@ -771,6 +784,7 @@ object ApplicationMaster extends Logging {
private var master: ApplicationMaster = _
+
--- End diff --
nit: remove
---
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