Github user kayousterhout commented on the pull request:
https://github.com/apache/spark/pull/900#issuecomment-47148880
@tgravescs @li-zhihui I would be in favor of moving the wait earlier --
because currently every job will call waitBackendReady(), but really this
should just be called once when the app is initialized (since once it is ready,
it will never become un-ready with the current code). If at some point this
gets used to check the state of things between stages, as @tgravescs suggested,
we can then move it to be checked before each stage.
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