Github user aarondav commented on the pull request:
https://github.com/apache/spark/pull/1678#issuecomment-50705532
@mridulm Please take a look if possible.
@mateiz This now interacts with the ExternalSorter stuff, and it's possible
it partially helps fix a serialization bug (since some serializers apparently
write things during a close() after a flush()).
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