Github user JoshRosen commented on the pull request:
https://github.com/apache/spark/pull/6293#issuecomment-105612217
I discovered that this didn't entirely fix the problem, since there are
some corner-cases where we attempt to construct multiple open OutputStreams
from the same serializer instance. I've opened #6415 to demonstrate this bug
and discuss possible fixes. One solution might be to just revert all of the
serializer re-use related patches until we can come up with a design that's
easier to prove safe.
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