John Joseph created NIFI-12459:
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Summary: The node disconnection on nifi cluster mode,
java.net.UnknownHostException:
Key: NIFI-12459
URL: https://issues.apache.org/jira/browse/NIFI-12459
Project: Apache NiFi
Issue Type: Bug
Components: NiFi Stateless
Affects Versions: 1.23.2, 1.22.0
Reporter: John Joseph
Attachments: image-2023-12-04-10-11-08-601.png,
image-2023-12-04-10-11-53-220.png
This issue has been observed in both 1.22 and 1.23.2Nifi is running in cluster
mode in k8s (3 pods), Embedded zookeeper is enabled. The nodes appear to be
disconnected, there is a pop up that says.
This node is currently not connected to the cluster. Any modifications to the
data flow made here will not replicate across the cluster. (PFA)
So we :
executed to pods having the issue (kubectl exec -it <nifi-0> <namespace> bash),
proceed to opt/nifi/data/conf_directory ,
delete the flow.xml.gz file,
exit the pod,
delete the pod using kubectl delete po <nifi-0> <namespace> command .
{_}This was once suggested to us by one of the members here.{_}RESULT:
The pods came back up, but the UI this time had a different error.
The Flow Controller is initializing the Data Flow(PFA).
The logs do not have any exception stack trace but only this.
[main] o.a.nifi.controller.StandardFlowService Failed to connect to cluster due
to: org.apache.nifi.cluster.protocol.ProtocolException: Failed to create socket
to nifi-2/<unresolved>:11443 due to: java.net.UnknownHostException: nifi-2
The node disconnection has been happening for us here and there (not frequent)
!image-2023-12-04-10-11-08-601.png|width=762,height=382!
!image-2023-12-04-10-11-53-220.png!
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