[jira] [Created] (NIFI-7559) NiFi Cluster page shows multiple entries for same node identity

["Mohammed Nadeem (Jira)" <ji...@apache.org>]

Mohammed Nadeem created NIFI-7559:
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             Summary: NiFi Cluster page shows multiple entries for same node identity
                 Key: NIFI-7559
                 URL: https://issues.apache.org/jira/browse/NIFI-7559
             Project: Apache NiFi
          Issue Type: Bug
          Components: Core Framework, Core UI
    Affects Versions: 1.9.2, 1.9.1
         Environment: Linux
            Reporter: Mohammed Nadeem
         Attachments: image-2020-06-19-02-01-35-512.png, image-2020-06-19-02-50-27-674.png, image-2020-06-19-02-52-35-420.png

In a containerized environment, When a NiFi node doesn't meet health probes performed by Kubelet (Kubernetes), then the node is killed and restarted. This may loop continuously causing *NiFi Cluster page* ( Hamburger Menu -> Cluster ) to show multiple entries for the same node that gets restarted again and again.

To replicate the issue:
1. Setup single-node cluster ( statefulset application with replicaCount = 1)
2. Change configured probes such as Startup or Liveness to duration less than regular node start up time .
3. Scale new node (replicaCount), for example from 1 to 2. Then new scaled node *node-1* gets killed and restarted continuously by kubelet . 

Please check the screenshot below. 

*nifi-1:8080* is being added 7 times when it should be added just once, This shows  incorrect *1/8* nodes cluster summary when expected behavior is just 1/2 nodes . 

!image-2020-06-19-02-50-27-674.png!



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