I am trying to decommision an HDFS host but the process just hangs and the node failes to decommission. I'm not sure how to go about troubleshooting this problem. Any suggestions? I've tried shutting down the service manually but I can't figure out how to. There is nothing in the /etc/init.d that seems to be related to the HDFS service. I should mention that the real problem is that even though I have YARN and HDFS running on that host, no jobs are shceduled to it. So I'm trying to reinstall everything to see if that fixed things.