Github user andrewor14 commented on a diff in the pull request:
https://github.com/apache/spark/pull/5432#discussion_r29472977
--- Diff:
core/src/main/scala/org/apache/spark/scheduler/SchedulerBackend.scala ---
@@ -41,4 +41,11 @@ private[spark] trait SchedulerBackend {
*/
def applicationId(): String = appId
+ /**
+ * Get an application ID associated with the job.
+ *
--- End diff --
when is this defined vs None? Is it as simple as "if the cluster manager
provides it then it's defined, otherwise none"?
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