NIfi application is disconnecting : FlowSynchronizationException

[#1]

nifi is hosted in AKS cluster  of node count 3. occasionally we are receiving below errors and node-0  always gets disconnected

Could you please give some inputs or help possible

logs:2025-11-01 01:01:12,444 INFO [Reconnect to Cluster] o.a.n.f.s.StandardVersionedComponentSynchronizer Updated UpdateAttribute[id=9b95428d-2972-38fa-b7cd-20d759b4e749]
2025-11-01 01:01:12,445 INFO [Reconnect to Cluster] o.a.n.f.s.StandardVersionedComponentSynchronizer Updated ExecuteSQLRecord[id=07e8f117-fcdf-39a9-a989-3deb3b467263]
2025-11-01 01:01:12,445 INFO [Reconnect to Cluster] o.a.n.f.s.StandardVersionedComponentSynchronizer Updated UpdateAttribute[id=2be213fa-1965-3303-9e4f-ebbb8e3dec37]
2025-11-01 01:01:12,445 INFO [Reconnect to Cluster] o.a.n.f.s.StandardVersionedComponentSynchronizer Updated StandardProcessGroup[identifier=cd3be53f-130d-3a1c-8e5a-ed86de708fd8,name=fullload-process-configuration]
2025-11-01 01:01:12,445 INFO [Reconnect to Cluster] o.a.n.f.s.StandardVersionedComponentSynchronizer Updated StandardProcessGroup[identifier=36476f9f-018d-1000-ffff-ffff9a57bb5b,name=ifsview-fullload-currentstate]
2025-11-01 01:01:12,445 INFO [Reconnect to Cluster] o.a.n.f.s.StandardVersionedComponentSynchronizer Updated StandardProcessGroup[identifier=059a87b9-2902-326e-9dcf-6f4369cc924e,name=fullload-data-ingestionoperational]
2025-11-01 01:01:12,446 INFO [Reconnect to Cluster] o.a.n.f.s.StandardVersionedComponentSynchronizer Updated StandardProcessGroup[identifier=ca3fa104-6604-32ce-8933-cdc48eaca2e2,name=fullload-data-ingestionanalytics]
2025-11-01 01:01:12,446 INFO [Reconnect to Cluster] o.a.n.f.s.StandardVersionedComponentSynchronizer Updated StandardProcessGroup[identifier=78b00966-4bc8-3525-924f-1605e0bb068b,name=fullload-data-extraction]
2025-11-01 01:01:12,446 INFO [Reconnect to Cluster] o.a.n.f.s.StandardVersionedComponentSynchronizer Updated StandardProcessGroup[identifier=7b0f0ebd-09ad-3fb0-82b7-84b11e68bc23,name=fullload-operational-truncatelandingzonetables]
2025-11-01 01:01:12,447 INFO [Reconnect to Cluster] o.a.n.f.s.StandardVersionedComponentSynchronizer Updated StandardProcessGroup[identifier=45be6018-1c49-3810-9785-7d082054335a,name=fdh-logging-operational]
2025-11-01 01:01:12,447 INFO [Reconnect to Cluster] o.a.n.f.s.StandardVersionedComponentSynchronizer Updated StandardProcessGroup[identifier=681a5022-25b1-30fe-a041-d827aa4785ae,name=fullload-process-configuration]
2025-11-01 01:01:12,447 INFO [Reconnect to Cluster] o.a.n.f.s.StandardVersionedComponentSynchronizer Updated StandardProcessGroup[identifier=bf2be415-018f-1000-0000-00000a313b15,name=fdhoperational-fullload-landingzone]
2025-11-01 01:01:12,448 INFO [Reconnect to Cluster] o.a.n.f.s.StandardVersionedComponentSynchronizer Updated StandardProcessGroup[identifier=d294e6bd-ba08-3a09-a04b-7528ab3745f1,name=deltaprocess-cache-updates]
2025-11-01 01:01:12,448 INFO [Reconnect to Cluster] o.a.n.f.s.StandardVersionedComponentSynchronizer Updated LocalPort[id=bdb77786-6aee-30b2-bfb2-75671f47c5c2, type=OUTPUT_PORT, name=outputportlogging (78ac3d2a-a6d6-3fe2-b9f2-3cdca6956dd7), group=deltaload-data-ingestionanalytics]
2025-11-01 01:01:12,450 INFO [Reconnect to Cluster] o.a.n.c.s.AffectedComponentSet Starting the following components: AffectedComponentSet[inputPorts=[], outputPorts=[], remoteInputPorts=[], remoteOutputPorts=[], processors=[], parameterProviders=[], flowRegistryCliens=[], controllerServices=[], reportingTasks=[]]
2025-11-01 01:01:12,450 INFO [Reconnect to Cluster] o.a.nifi.controller.StandardFlowService Disconnecting node due to Failed to properly handle Reconnection request 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.
2025-11-01 01:01:12,471 INFO [Reconnect to Cluster] o.apache.nifi.controller.FlowController Will no longer send heartbeats
2025-11-01 01:01:12,471 INFO [Reconnect to Cluster] o.apache.nifi.controller.FlowController FlowController will stop sending heartbeats to Cluster Coordinator
2025-11-01 01:01:12,471 INFO [Reconnect to Cluster] o.apache.nifi.controller.FlowController Cluster State changed from Clustered to Not Clustered
2025-11-01 01:01:12,477 INFO [Reconnect to Cluster] o.a.n.c.l.e.CuratorLeaderElectionManager Cannot unregister Leader Election Role 'Primary Node' because that role is not registered
2025-11-01 01:01:12,477 INFO [Reconnect to Cluster] o.a.n.c.l.e.CuratorLeaderElectionManager Cannot unregister Leader Election Role 'Cluster Coordinator' because that role is not registered
2025-11-01 01:01:12,477 INFO [Reconnect to Cluster] o.a.nifi.controller.StandardFlowService Node disconnected due to Failed to properly handle Reconnection request 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.
2025-11-01 01:01:12,477 ERROR [Reconnect to Cluster] o.a.nifi.controller.StandardFlowService Handling reconnection request failed 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.
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.

[#2]

@Sanga Welcome to the Cloudera Community!

To help you get the best possible solution, I have tagged our NiFi experts @mburgess @MattWho  who may be able to assist you further.

Please keep us updated on your post, and we hope you find a satisfactory solution to your query.

[#3]

@Sanga 

1. What is the specific Apache NiFi version being used?
2. Any disk space issues on Node-0?
3. Any other exceptions in the NiFi logs?
4. Logs shared cover the reconnection attempt.  What was the reason given for the node disconnection?

Thank you,

Matt