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From "Mohammed Nadeem (Jira)" <j...@apache.org>
Subject [jira] [Updated] (NIFI-7559) NiFi Cluster page shows multiple entries for same node identity
Date Thu, 18 Jun 2020 21:34:00 GMT

     [ https://issues.apache.org/jira/browse/NIFI-7559?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Mohammed Nadeem updated NIFI-7559:
----------------------------------
    Attachment:     (was: image-2020-06-19-02-50-27-674.png)

> 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: 1.9.1, 1.9.2
>         Environment: Linux
>            Reporter: Mohammed Nadeem
>            Priority: Major
>         Attachments: 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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