Github user yhuai commented on the pull request:
https://github.com/apache/spark/pull/5849#issuecomment-98563510
Seems the reason of those test failures is that we are buffering records in
the reader side of the shuffle process and we are currently using mutable rows,
which require explicitly `copy` when we use buffer.
@sryza Is there any place in the sort based shuffle that we buffer
key-value pairs?
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