OASIS Topology and Orchestration Specification for Cloud Applications (TOSCA) TC

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Re: [tosca] RE: updated operational model

  • 1.  Re: [tosca] RE: updated operational model

    Posted 02-10-2022 17:38




    Hi Peter,
     
    Please see inline again.
    BR/Calin
     

    From:
    "Bruun, Peter Michael (CMS RnD Orchestration)" <peter-michael.bruun@hpe.com>
    Date: Thursday, 10 February 2022 at 18:14
    To: Calin Curescu <calin.curescu@ericsson.com>, Chris Lauwers <lauwers@ubicity.com>, "tosca@lists.oasis-open.org" <tosca@lists.oasis-open.org>
    Subject: RE: [tosca] RE: updated operational model


     

    Hi Calin,
     
    I concur totally with what you propose. I am sure that several of us have actually implemented something like this, and for me it works nicely.
     
    I am, however, noting that some members object strongly to the idea of a âdependency graphâ driving orchestration. Deriving a dependency graph from Relationships is, as far as I am aware, not part
    of the our TOSCA standardization. So this would be completely up to the profiles to define.
    [CC] I believe that this is the only outstanding feature of TOSCA. The representation graph is the dependency graph in my
    opinion. I think that TOSCA 2.0 is freeing the orchestration from the âStandardâ dependencies of TOSCA 1.3, so any set of relationship types in a profile can be used for different dependency graphs which are subsets of the representation graph.

    [CC] I also believe that the orchestration should be constructed by following these different relationships/dependencies
    subgraphs. This is for me the âmodel driven approachâ. The beauty is that the orchestration can adapt to any size and form of the representation graph automatically (which can change as a consequence of an update or upgrade).
     
    The ETSI standard does define how a template can refer to a previous/subsequent version of itself, although the way it is done there is perhaps not the best design.
    [CC] I think we can solve this with service template versioning in TOSCA directly.
     
    Peter
     


    From: Calin Curescu [mailto:calin.curescu@ericsson.com]

    Sent: 10. februar 2022 17:50
    To: Bruun, Peter Michael (CMS RnD Orchestration) <peter-michael.bruun@hpe.com>; Chris Lauwers <lauwers@ubicity.com>; tosca@lists.oasis-open.org
    Subject: Re: [tosca] RE: updated operational model


     
    Hi Peter,
     
    Some answers/opinions inline



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