Github user steveloughran commented on a diff in the pull request:
https://github.com/apache/spark/pull/9182#discussion_r43246273
--- 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 */
+ private var attemptId: Option[ApplicationAttemptId] = None
+
+ /** Scheduler extension services */
+ private val services: SchedulerExtensionServices = new
SchedulerExtensionServices()
+
+ /**
+ * Bind to YARN. This *must* be done before calling [[start()]].
+ *
+ * @param appId YARN application ID
+ * @param attemptId Optional YARN attempt ID
+ */
+ protected def bindToYARN(appId: ApplicationId, attemptId:
Option[ApplicationAttemptId]): Unit = {
--- End diff --
OK
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