[jira] [Commented] (NIFI-10338) When adding more nodes in a Nifi Cluster mode, new nodes cannot find existing parameter contexts

["Andreas Adamides (Jira)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/NIFI-10338?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17579025#comment-17579025 ] 

Andreas Adamides commented on NIFI-10338:
-----------------------------------------

# *Scaling down* Nifi cluster, i.e. from 3->1 node
 # Doing *changes* while on 1 node, i.e. adding a parameter context or changing flows
 # *Scaling up* Nifi Cluster, i.e. from 1-> 3 nodes
 # This results in sync issues, since when step(1) occurs, only the Kubernetes pod gets deleted, and not the Kubernetes *PVC* relating to state of parameter contexts. Then, when (3) occurs, there are multiple *exceptions* occurring because the PVC of the nodes that were missing , do not know about the changes.

Repeating the above, but deleting the flowfile repository PVC before (3), solves the issue

> When adding more nodes in a Nifi Cluster mode, new nodes cannot find existing parameter contexts
> ------------------------------------------------------------------------------------------------
>
>                 Key: NIFI-10338
>                 URL: https://issues.apache.org/jira/browse/NIFI-10338
>             Project: Apache NiFi
>          Issue Type: Bug
>          Components: NiFi Stateless
>    Affects Versions: 1.16.1
>         Environment: Kubernetes, Docker Image is based on Alpine/Java amazoncorreto: 8u312 
>            Reporter: Andreas Adamides
>            Priority: Critical
>
> My setup is Nifi in Cluster mode, initially with 1 node. I have created a parameter context and associated it with process groups(>1) in my Canvas. When I increase to three nodes(they successfully connect in the cluster), and when I reach the Nifi UI, to view/edit that very same parameter context I get the error:
> {code:java}
> No parameter context with id: "<Uuid>"
> {code}
> I also get the same error when I try to reach the parameter context via the APIs. When I list all parameter contexts this param context shows up, but when I try to modify or even delete via API call, I get the same error.
> When I scale back to 1 node, repeat the above in the Nifi UI, I can view/edit the parameter context without any issues. 
> If it matters I am using [https://github.com/cetic/helm-nifi] to deploy my Nifi Cluster. I suspect there might be a sync issue at some point, causing the new nodes to not know about that parameter context, but I cannot tell which one.
> Can anyone please suggest a fix or any pointers as to how to approach this issue?



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