You have installed the destination ZooKeeper cluster.

You have installed and configured a NiFi cluster to use the destination ZooKeeper cluster.

If you are migrating ZooKeepers due to upgrading NiFi from 0.x to 1.x,, you have already followed appropriate NiFi upgrade steps.

You have configured Kerberos as needed.

You have not started processing any dataflow (to avoid duplicate data processing).

If one of the ZooKeeper clusters you are using is configured with Kerberos, you are running the ZooKeeper Migrator from a host that has access to NiFi's ZooKeeper client jaas configuration file (see Kerberizing NiFi's ZooKeeper Client for more information).