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https://issues.apache.org/jira/browse/NIFI-3129?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15708959#comment-15708959
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Mark Payne commented on NIFI-3129:
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Looking at the template, it appears that the Controller Service is actually
listed twice within the Template: once for the parent Process Group and once in
the child Process Group. Within the child Process Group, the Controller Service
is listed with a Parent Group ID that points to the parent group, not the
child. It seems that when we create a snippet that includes Controller
Services, as would be the case in a Template, that we add all Controller
Services that are referenced, for each group that they are referenced in,
instead of just adding it to the upper-most level.
> When adding template to flow, I receive failure message "The specified
> observer identifier already exists."
> -----------------------------------------------------------------------------------------------------------
>
> Key: NIFI-3129
> URL: https://issues.apache.org/jira/browse/NIFI-3129
> Project: Apache NiFi
> Issue Type: Bug
> Components: Core Framework
> Affects Versions: 1.0.0, 1.1.0
> Reporter: Mark Payne
> Assignee: Mark Payne
> Priority: Critical
> Fix For: 1.2.0
>
>
> I have a template that I generated. Whenever I try to drop the template onto
> the graph, and the UI gives me an error: "The specified observer identifier
> already exists."
> Part of the template is added to the graph, but it then stops without adding
> the rest of the components.
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