Github user vanzin commented on a diff in the pull request:
https://github.com/apache/spark/pull/2432#discussion_r18180857
--- Diff:
core/src/main/scala/org/apache/spark/scheduler/SchedulerBackend.scala ---
@@ -34,9 +36,11 @@ private[spark] trait SchedulerBackend {
/**
* 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.
*/
- def applicationId(): Option[String] = None
+ def applicationId() = new
ApplicationId(System.currentTimeMillis.toString)
--- End diff --
So... the mesos backend (at least) does not override this. Also, the
semantics of this default implementation are weird: if you call this method `n`
times, you'll get `n` different ids.
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