Can't connect to the nifi UI

[#1]

Hi,

I have a hadoop environment that has 2 nifi nodes running. I am not able to connect to the nifi UI since yesterday and i try do restart one of the node without any success....

In in nifi-app.log, file seeing this as only Error level error:

2020-03-17 13:42:37,974 ERROR [main] o.a.n.c.c.node.NodeClusterCoordinator Event Reported for ***-nf02.****.ca:9091 -- Node disconnected from cluster due to org.apache.nifi.controller.UninheritableFlowException: Failed to connect node to cluster because local flow is different than cluster flow.

Could please help?

[#2]

You need to stop the nifi node that is outputing that error, copy the flow.xml.gz from the nifi/conf dir from a healthy node and start nifi again

[#3 · Accepted solution]

@Koffi 

When a NiFi node attempts to connect to an existing NiFi cluster, there are three files that are checked to make sure they match exactly between the connecting node and the existing copies in the cluster.  Those files are:

1. flow.xml.gz

2. users.xml (will only exist if NiFi is secured over https)
3. authorizations.xml (not to be confused with the NiFi authorizers.xml file.  Will only exist if NiFi is secured over https)

The output in the nifi-app.log of the node should explain exactly what the mismatch was the first time it tried to connect to the cluster.

Hope this helps,

Matt