I'm playing around with a 2-node cluster running Hortonworks Data Platform 2.1, running on AWS EC2 instances. Today I discovered that for some reason my master node had decided to no longer recognise my private key, so I could no longer SSH in to the host to work on the project.
In this case it's not really a show-stopper as I have all the important stuff saved elsewhere and I am rebuilding the ambari server node. My question is, is it possible to change the master node and so preserve the data in HDFS in this situation? I could probably prevent this from happening again by having a secondary authorised key for the host, but I would expect there should be some mechanism to change the master node. Is there one? I couldn't find a way of doing it through Ambari, so perhaps it's a more manual process? Regards, Charles
