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https://issues.apache.org/jira/browse/NIFI-12459?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]
Pierre Villard resolved NIFI-12459.
-----------------------------------
Resolution: Feedback Received
Apache NiFi 1.x is no longer maintained and no new release is planned on the
1.x release line. Marking as resolved as part of a cleanup operation. Please
open a new one with an updated description if this is still relevant for NiFi
2.x.
> The node disconnection on nifi cluster mode. 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
> --------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
>
> Key: NIFI-12459
> URL: https://issues.apache.org/jira/browse/NIFI-12459
> Project: Apache NiFi
> Issue Type: Bug
> Components: NiFi Stateless
> Affects Versions: 1.20.0, 1.22.0, 1.23.2
> Reporter: John Joseph
> Priority: Major
> 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)
> 2 out of 3 nifi pods are having the below message:
> [Clustering Tasks Thread-3] o.apache.nifi.controller.FlowController Failed to
> send heartbeat due to: org.apache.nifi.cluster.protocol.ProtocolException:
> Failed to send message to Cluster Coordinator
> 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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