Github user mridulm commented on the pull request:
https://github.com/apache/spark/pull/2078#issuecomment-53153441
Why it happens is anyone's guess, I know it happens since fairly the very
beginning when I started using nio in 1.4.x; and continues till today. If you
search online, you will see a lot of people still hit it (and most of them are
not on 1.4.x).
I added this codepath since selector thread was dying due to this issue.
Btw, if you actually look at the evaluation of the bug, you will notice
that some workarounds are suggested - which are not applicable to a moderately
multi-threaded app like spark (we dont know 'when' we will be done with a key
!).
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