Github user li-zhihui commented on the pull request:
https://github.com/apache/spark/pull/900#issuecomment-47061333
@tgravescs
I add a new commit that move waitBackendReady from DAGScheduler.submitStage
to TaskSchedulerImpl.submitTasks, for 2 reasons
* Optimize performance, some works (creating TaskSet, building task
preferred locality...) is irrelevant with executor, that can be done before
waiting backend ready.
* Clear responsibility, it seems waiting backend ready is responsibility of
TaskScheduler, not DAGScheduler.
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