Github user vanzin commented on a diff in the pull request: https://github.com/apache/spark/pull/9182#discussion_r43253907 --- Diff: yarn/src/main/scala/org/apache/spark/scheduler/cluster/YarnSchedulerBackend.scala --- @@ -51,6 +51,38 @@ private[spark] abstract class YarnSchedulerBackend( private implicit val askTimeout = RpcUtils.askRpcTimeout(sc.conf) + /** Application ID. Must be set by a subclass before starting the service */ + private var appId: ApplicationId = null + + /** Attempt ID. This is unset for client-side schedulers */ --- End diff -- nit: "client mode schedulers" is more in line with how the rest of code refers to things.
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