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https://issues.apache.org/jira/browse/AMBARI-7201?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14132403#comment-14132403
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Newton Alex commented on AMBARI-7201:
-------------------------------------

Had a chat with [~mahadev], [~jspeidel] and a few others today  regarding the 
common-services and Bigtop stack service definitions.
Here is what we agreed upon:

"For Ambari 1.7, we can have the Bigtop stack checked in (AMBARI-7292) as a 
sibling to HDP stack. PHD stack will inherit the stack definitions from BT 
stack.
Once the common services infrastructure is available in Ambari-2.0, we can move 
the service definitions from BT stack into the common-services (AMBARI-7293) 
and all other stacks HDP, BT and PHD can inherit from the common-services.

Please let us know if you see any problem with this approach. Thanks

> Common Services
> ---------------
>
>                 Key: AMBARI-7201
>                 URL: https://issues.apache.org/jira/browse/AMBARI-7201
>             Project: Ambari
>          Issue Type: Epic
>          Components: stacks
>    Affects Versions: 2.0.0
>            Reporter: Robert Levas
>              Labels: common-services, service, stack
>             Fix For: 2.0.0
>
>         Attachments: CommonStackServicesTechnicalDocument.pdf
>
>   Original Estimate: 504h
>  Remaining Estimate: 504h
>
> *Problem*
> The current implementation of the Ambari stack does not allow for a common 
> set of services to be defined and reused in vendor-specific stack 
> definitions. Therefore in order for the same service to be made available to 
> different stacks, it’s definition must be copied or inherited from stack to 
> stack.  
> *Solution*
> There needs to be a repository of services that exist outside the scope of 
> any vendor-specific stack, but are accessible to vendor-specific stacks via 
> service inheritance. This set of services should be known as common services 
> and are to be maintained by the community to ensure that changes do not break 
> vendor-specific services that inherit from them. 
> See [^CommonStackServicesTechnicalDocument.pdf] for more information.



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