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https://issues.apache.org/jira/browse/AMBARI-7242?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14130638#comment-14130638
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John Speidel commented on AMBARI-7242:
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Bob, there should be a link to the review board included in the Jira.
> Unnecessary conditional dependencies added to Blueprint when NAGIOS_SERVER
> included
> -----------------------------------------------------------------------------------
>
> Key: AMBARI-7242
> URL: https://issues.apache.org/jira/browse/AMBARI-7242
> Project: Ambari
> Issue Type: Bug
> Components: ambari-server
> Affects Versions: 1.6.1
> Reporter: Robert Nettleton
> Assignee: Robert Nettleton
> Fix For: 1.7.0
>
>
> If an Ambari Blueprint is posted that includes the "NAGIOS_SERVER" component
> in a host group definition, some YARN-related dependencies are automatically
> added to the blueprint, even if YARN is not referenced in the blueprint.
> This means that a blueprint may have slightly different content after a POST,
> so that the GET will return a blueprint with more components than originally
> desired.
> This problem is caused by the fact that some dependencies in Ambari are
> conditional, and this type of dependency is not yet modeled in the Ambari
> Stack Definitions. Whenever the NAGIOS_SERVER component is included, the
> dependencies associated with that component (including YARN_CLIENT,
> TEZ_CLIENT, etc) are also added to the blueprint during the creation process.
>
> The Blueprint handling code needs to be modified in order to handle this
> conditional type of dependency in the short term. As a longer-term fix,
> eventually these dependencies should be included in the stack definitions.
> I'll be posting a patch shortly that addresses this problem.
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