Hi Ted, hi Nick, thanks for helping. I was not that confident that the problem was the hostname, however that was it. The node was recognized with its FQDN because when we added the new node we forgot to modify /etc/hosts neither on the old nodes nor on the new one. Now I have fixed all /etc/hosts and it is working.
Any idea on the reason why we were getting that problem? At the end of the day, all the nodes were communicating as expected (DNS is up, /etc/hosts settings are probably superfluous in my case) and other services (hdfs, map-reduce, Impala, ...) were not reporting problem. Thanks again, Michele
