Github user tgravescs commented on the pull request:
https://github.com/apache/spark/pull/900#issuecomment-45794544
yarn uses CoarseGrainedSchedulerBackend for standalone mode and the
YarnClientSchedulerBackend (which is based on CoarseGrainedSchedulerBackend)
for client mode. I don't see this pr handling that since its not incrementing
the totalExecutors. I haven't looked at it in detail yet but I would think you
could do it in RegisterExecutor and that would handle both since
SparkDeploySchedulerBackend is based on CoarseGrainedSchedulerBackend also.
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