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https://issues.apache.org/jira/browse/AMBARI-7201?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14135394#comment-14135394
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Robert Levas commented on AMBARI-7201:
--------------------------------------
[~nalex],
Sorry for the delay on this... after discussing a bit with [~jspeidel], it
seems like the 2 levels of version numbers may be overkill. I was trying to
come up with a use case for multiple versions of a service declaration for a
particular service version and failed to do so. Could you help with that. For
example, why would we have
{quote}
common-services/HDFS/2.4.1/versions/1.0
common-services/HDFS/2.4.1/versions/1.1
common-services/HDFS/2.6/versions/1.0
{quote}
Maybe we only really need to worry about one version of each
{quote}
common-services/HDFS/2.4.1
common-services/HDFS/2.6
{quote}
My inclination is to be the most flexible, but maybe I was trying to be too
flexible. Thoughts?
> 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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