Github user YolandaMDavis commented on the issue:
https://github.com/apache/nifi/pull/739
@markap14 was able to test with 2 node cluster removing one node from
cluster, changing it's flow by adding a new processor, and attempting to add it
back to the cluster. Did confirm through debug and log review that upon the
UninheritableFlowException node's clustered state was set to false and node was
unregistered from both Primary Node and Cluster Coordinator roles in leader
election. Updating flow to match original flow did allow the node to rejoin
the cluster without issue.
+1
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