Joining a node to a NiFi cluster fails because of duplicate node id

[#1]

When adding a node to a NiFi cluster, I receive an error saying the NCM prevented connection due to the node id already existing.

[#2 · Accepted solution]

This was resolved by removing the state directory in the node.

The node was originally configured with incorrect hostnames copied from an existing node's nifi.properties, which led the generation of an incorrect nodeid and storage in state. When the host settings were corrected the node id persisted in the state folder. Removing this folder corrected the problem and allowed the node to be joined to the cluster correctly.

[#3]

Thanks for putting this out Simon! We definitely need to make this something people don't need to think about. Ideas welcome.