Github user mateiz commented on the pull request:
https://github.com/apache/spark/pull/1499#issuecomment-50115862
@mridulm that should've been fixed recently in
https://github.com/mateiz/spark/commit/9c299579f13f004f5fd1f4dd0b98b7d76cac2a55,
which got rid of custom return types in ShuffledRDD for this reason (see the
message there). Maybe you need to do a clean rebuild. In an earlier commit I
also added a version of ShuffleSuite that runs all those tests with sort-based
shuffle.
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