Github user andrewor14 commented on the pull request:
https://github.com/apache/spark/pull/10368#issuecomment-167855990
What first two days of work are you referring to? The problem is we just
can't use Kryo for serializing task results because there might be unregistered
classes. Because of this constraint we can't use `spark.serializer` here since
the user can specify Kryo there.
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