Github user sarutak commented on the pull request:
https://github.com/apache/spark/pull/2078#issuecomment-53151994
Thanks @mridulm .
The answer I want is why selector.select throws CancelledKeyException even
through JavaDoc doesn't say select() throws the exception.
Before, there was a bug that Selector#select throws CancelledKeyException
but it's already resolved.
You can check that here
(http://www.oracle.com/technetwork/java/javase/releasenotes-138306.html , Bug
ID is 4729342)
If you are worried about there is still bug, we should leave comment why
enclosing selector.select by try block or log it may be JDK bug when throwing
CancelledKeyException from selector.select.
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