Github user mridulm commented on the pull request:
https://github.com/apache/spark/pull/3600#issuecomment-66407791
-1 This is broken change for multiple reasons - finalize of out of scope
variable can trigger close of underlying fd, potential state issue with vars
not being null when we expect them to be; not to mention the cost 'saved' is
fairly trivial anyway to introduce changes to this codepath.
please be very careful changing disk writers in spark ... we have spent too
much time debugging and fixing it; correctness and functionality is much more
important than perceived performance improvement.
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