Github user suyanNone commented on the pull request:
https://github.com/apache/spark/pull/4887#issuecomment-159140817
@andrewor14 I have the impression that cogroup will hold tow RDD's
iterator,
If the first iterator is `MEMORY_ONLY`, and unroll failed, so the iterator
is based of ` Right(vector.iterator ++ values)`
then the second is `MEMORY_AND_DISK`, and unroll failed, and we prepare to
put it into disk.
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