Github user mridulm commented on the pull request:
https://github.com/apache/spark/pull/2078#issuecomment-53154886
I am not on mac - and have seen this on solaris and linux (not in ctx of
spark); so the issue is not mac specific unfortunately (though it might also be
on mac !).
Btw, we cannot assume that channels are readable/writable when they are in
selector loop - it also includes channels which we have registered to connect,
might not be connectable (remote host/rack gone, dns issues, etc).
Simple example where it fails : connect socket, and before connect
completes, try to get remote address - it will return null. This specific
example is reasonably beneign, we dont get NPE - just garbage in logs. (which
is also the reason why we should always log the selection key directly)
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