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From: geomacy <git@git.apache.org>
To: dev@brooklyn.apache.org
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Subject: [GitHub] brooklyn-docs pull request #198: [WIP] Versioning
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Message-Id: <20170627105953.5A977DFD5A@git1-us-west.apache.org>
Date: Tue, 27 Jun 2017 10:59:53 +0000 (UTC)
archived-at: Tue, 27 Jun 2017 10:59:56 -0000

Github user geomacy commented on a diff in the pull request:

    https://github.com/apache/brooklyn-docs/pull/198#discussion_r124210641
  
    --- Diff: guide/blueprints/catalog/versioning.md ---
    @@ -3,18 +3,130 @@ title: Versioning
     layout: website-normal
     ---
     
    -### Versioning
    +Brooklyn supports multiple versions of a type to be installed and used at the same time.
    +Versions are a first-class concept and are often prominently displayed in the UI.
     
    -Version numbers follow the OSGi convention. This can have a major, minor, micro and qualifier part.
    -For example, `1.0`. `1.0.1` or `1.0.1-20150101`.
    +In order to do this, Brooklyn requires that the `id:version` string be unique across the catalog:
    +it is normally an error to add a type if a type with the same `id:version` is present.
    +The exceptions to this are if the definition is identical, or if the `version` is noted as a `SNAPSHOT`.
    +In extraordinary circumstances it may be appropriate to delete a given `id:version` definition
    +and then add the new one, but this is discouraged and the usual practice is to:
     
    -The combination of `id:version` strings must be unique across the catalog.
    -It is an error to deploy the same version of an existing item:
    -to update a blueprint, it is recommended to increase its version number;
    -alternatively in some cases it is permitted to delete an `id:version` instance
    -and then re-deploy.
    -If no version is specified, re-deploying will automatically
    -increment an internal version number for the catalog item.
    +* Use a `-SNAPSHOT` qualifer suffix on your version when developing
    +* Increase the version number when making a change to a non-SNAPSHOT type  
    +
    +When adding to the catalog, if no version is supplied, Brooklyn may automatically 
    +increment the version number for the catalog item.
    +
    +When deploying a blueprint, if a version number is not specified Brooklyn will typically use
    +the highest ordered version (see "Ordering" below) in the catalog for the referenced type,
    +and will thereafter lock the use of that version in that blueprint.
    +(An exception is where types are co-bundled or an explicit search path is defined;
    +in the context of evaluating one type, Brooklyn may prefer versions in the same bundle or on the search path.) 
    --- End diff --
    
    "may" again


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