Github user li-zhihui commented on the pull request:
https://github.com/apache/spark/pull/900#issuecomment-45833678
@tgravescs @kayousterhout The PR only work in standalone mode now. But it
provide a abstract method isReady() in SchedulerBackend.scala for all backend
implementations.
For yarn mode, it seems better to use registered number as threshold.
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