[jira] [Created] (AMBARI-7242) Unnecessary conditional dependencies added to Blueprint when NAGIOS_SERVER included

["Robert Nettleton (JIRA)" <ji...@apache.org>]

Robert Nettleton created AMBARI-7242:
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             Summary: 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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