Github user andrewor14 commented on a diff in the pull request:
https://github.com/apache/spark/pull/3962#discussion_r23511367
--- Diff:
yarn/src/main/scala/org/apache/spark/deploy/yarn/ApplicationMaster.scala ---
@@ -464,7 +472,7 @@ private[spark] class ApplicationMaster(args:
ApplicationMasterArguments,
/**
* Actor that communicates with the driver in client deploy mode.
--- End diff --
I don't understand. In both client and cluster modes, this actor is used to
communicate with the driver. It's just that in cluster mode since the driver
and the AM are run in the same JVM, the communication is local.
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