apache/spark — pull request #1219 by kayousterhout (2014-06-25 22:51:41+00:00)
Title: [SPARK-1749] Job cancellation when SchedulerBackend does not implement killTask 

This is a fixed up version of #686 (cc @markhamstra @pwendell). The last commit (the only one I authored) reflects the changes I made from Mark's original patch.