Github user revans2 commented on the pull request:
https://github.com/apache/storm/pull/311#issuecomment-63495857
@ptgoetz I traced this down in the netty code to the second parameter to
the call to bind in the socket.
https://docs.oracle.com/javase/7/docs/api/java/net/ServerSocket.html#bind%28java.net.SocketAddress,%20int%29
It sets the maximum incoming connection queue. That way if the boss thread
is unable to keep up with accepting new connections the OS will keep them
buffered for a while until it can get to them. This should only be an issue
when lots of connections are being established very quickly, which would only
happen for very large topologies.
@caofangkun it would be good to add a better explanation for the config to
the documentation for the config. I would also like it if we could rename the
config to something like ```storm.messaging.netty.socket.backlog``` as I can
see another backlog being created in the future for tuples, instead of TCP
connection requests.
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