If you are enabling NameNode High Availability in a multi-node cluster, you can run the
following commands on the primary and standby hosts while services are starting. Log in to
every host and run these commands as administrator.
On the primary host, run:
hdfs namenode -format -force
On each standby host, run:
hdfs namenode -bootstrapStandby -force hdfs zkfc -formatZK -force
