apache/spark — pull request #686 by markhamstra (2014-05-07 23:02:35+00:00)
Title: [SPARK-1749] Job cancellation when SchedulerBackend does not implement killTask

It turns out that having the DAGScheduler tell the taskScheduler to cancelTasks when the backend does not implement killTask (e.g. Mesos) is not such a good idea.