Github user andrewor14 commented on a diff in the pull request:
https://github.com/apache/spark/pull/2432#discussion_r18371655
--- Diff:
core/src/main/scala/org/apache/spark/scheduler/TaskScheduler.scala ---
@@ -67,9 +69,11 @@ private[spark] trait TaskScheduler {
/**
* The application ID associated with the job, if any.
+ * It is expected that the subclasses of TaskScheduler or
SchedulerBackend
+ * override this method and return an unique application ID.
*
- * @return The application ID, or None if the backend does not provide
an ID.
+ * @return The application ID, if the backend does not provide an ID.
--- End diff --
same here
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