Just to close this thread, we've detected that we miss a configuration inside the new configuration group (nifi.zookeeper.root.node). This parameter should be different in each configuration group in order to set a new path base where to save the new cluster configuration in Zookeeper (we didn't need to create the path, it was created as soon as we change the config). Now we have both groups of nifi instances up and running. Thanks for the help! ... View more