Nifi keep disconnecting due to below error , appreciated any help .
Node disconnected from cluster due to org.apache.nifi.controller.serialization.FlowSynchronizationException: Failed to connect node to cluster because local flow controller partially updated. Administrator should disconnect node and review flow for corruption. 2023-09-21 12:34:09,572 INFO [main] o.a.n.c.l.e.CuratorLeaderElectionManager Cannot unregister Leader Election Role 'Primary Node' because that role is not registered
What version of Apache NiFi are you using? There are some bugs that could lead to this. I recommend you are using Apache NiFi version 1.21 or newer.
Is it always the same node that is disconnecting or appear random? Was the ERROR in the nifi-app.log followed by a full stack trace?
- Make sure all nodes in your NiFi cluster are running with the same version of Apache NiFi. - Make sure that any custom or add-on nars and jars where added to all every node and have proper ownership and permissions. - Make sure all nodes use the same configured sensitive.props key and algorithm.
Depending on your version of Apache NiFi, you may have a flow.xml.gz or both a flow.xml.gz and flow.json.gz files. On the node that is disconnecting, stop the node, and then rename the existing flow.xml.gz and flow.json.gz (if exists). If you restart NiFi, it will inherit the flow from the cluster when it joins and write new flow.xml.gz and flow.json.gz files to disk.
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