Github user ijokarumawak commented on the issue:
https://github.com/apache/nifi/pull/1342
I used InetAddress.getHostName() to convert ip address to hostname, but if
it can't resolve hostname, it just returns ip address. It depends on network
environment. If `$ host <ipaddress>` command can't resolve the hostname, then
InetAddress.getHostName wouldn't be able to resolve, too.
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