Fixed intended side-effects
Merge branch 'Stages4Jobs' of github.com:markhamstra/incubator-spark into Stages4Jobs
Merge branch 'Stages4Jobs' of github.com:markhamstra/incubator-spark into Stages4Jobs
Merge branch 'Stages4Jobs' of github.com:markhamstra/incubator-spark into Stages4Jobs
Refactoring to make job removal, stage removal, task cancellation clearer