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 dependency graph 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 Standard 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 model driven approach . 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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