https://community.cloudera.com/t5/Support-Questions/Active-Namenode-unable-to-restart-start-in-high-availability/m-p/181512#M143720 <P><A rel="user" href="https://community.cloudera.com/users/13878/khandelwalvinay22.html" nodeid="13878">@Vinay Khandelwal</A> - When you are shutting down the machine, the NameNode along with the Zkfc server will go down. The other NameNode will automatically failover to become the Active NameNode. There is no restart required here.</P><P>Other question I have for you is how many DataNodes you have on your 3 node cluster. Was there a Datanode running on the host you shutdown as well?</P> Sat, 01 Apr 2017 06:59:35 GMT namaheshwari 2017-04-01T06:59:35Z