Github user kayousterhout commented on the pull request:
https://github.com/apache/spark/pull/1149#issuecomment-47595725
@rxin I don't think we can remove the check in
CoarseGrainedSchedulerBackend -- the problem is that if the user is using a
different scheduler (e.g., Mesos), the threshold for how big a serialized task
can be may be different. So that code should only be run when using Coarse
grained spark mode, and not for the alternatives.
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