Github user srowen commented on the pull request:
https://github.com/apache/spark/pull/2957#issuecomment-60584591
Yeah I think that would be enough to guarantee it, and it makes sense.
Either interrupt happens before the task nulls the reference, in which case the
task is not done no other task will have started on the same thread, or, it
happens after in which case it will find the reference null and do nothing. +1!
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