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