@Gu Gur And just to add a little detail to Matt's comment, from the documentation, Regular Expressions are entered by adding user-defined properties; the name of the property maps to the Attribute Name into which the result will be placed. ... View more

Thank you very much! ... View more

so, it seems that ZooKeeper Migrator could be used? Migrating from an embedded ZooKeeper in NiFi 0.x or 1.x to an external ZooKeeper ... View more

@Gu Gur You just need to make sure the following lines in the new nodes nifi.properties file match the same lines in the nifi.properties files of those nodes already in your cluster. I also recommend setting/updating the following line in the nifi.properties file on every node in your cluster each time you add or remove a node: nifi.cluster.flow.election.max.candidates= It is blank by default which means the UI will be unavailable for 5 minutes whenever the cluster is restarted while NiFi waits for the leader election to complete. Of course all your rest of the "cluster node properties" must be set on your new nodes as well. Any changes to the nifi.properties file will require a NiFi restart to take affect Thanks, Matt ... View more