Re: Migrations Open Space Results

Thanks, Johannes, this is very useful.

On 1 November 2014 01:01, Johannes Raggam <[email protected]> wrote:

>
> We had today an interesting Open Space regarding Plone Migrations.
>
> We were talking about our experience with different migration
> strategies:
>
> 1) Using the normal plone.app.upgrade path.
>
> - Pros: Fastest method, if there is no mess with add on products. There
> are normally no content integrity problems. The contents of the site
> should appear the same after the migration as before. Except you get
> into troubles with add on products.
>
> - Cons: If you take the chance to remove unnecessary add ons, you'd
> probably uninstall them before migrating. But those add ons need
> uninstall profiles, often also uninstall setuphandler routines. Those
> are often not available or incomplete. In any case, you should expect
> some cruft still being around, like some properties in
> portal_quickinstaller or portal_properties or some portlets still being
> registered...
>
>
> 2) Using zopyx.plone.migrations. This one is exporting contents into
> Python pickles and importing them afterwards. You need to have the same
> content products installed in the target Plone site to be able to import
> content successfully.
>
> - Pros: Exporting/Importing Python. Goes relative fast (E.g. ~50GB
> export/import done in ca. 3 hrs). No data serialization mess.
>
> - Cons: There might be the need to modify the importer to fit your
> requirements.  No support for archetypes.schemaextender (the trick is to
> copy the schemaextender schematas over to another Archetypes base
> schema). Unsure, if object annotations are exported (e.g.
> plone.app.discussion).
>
> Links:
> https://github.com/zopyx/zopyx.plone.migration
>
> You might want to take a look this fork, which adds batch export/import,
> LinguaPlone support + more:
> https://github.com/bluedynamics/zopyx.plone.migration
>
>
> 3) Using transmogrifier. Transmogrifier exports and imports content via
> content serialization/deserialization.
>
> Pro: Modify content in a transmogrifier pipeline. Even export from one
> content type to another is no problem. Widely used within Plone
> community, lots of experience.
>
> Cons: A lot of configuration is necessary to get the transmogrifier
> chain right. But default blueprints can handle common migrations.
> Unclear, if there are blueprints for object annotations.
>
> Project overview:
>
> - collective.transmogrifier: Base transmogrifier package.
> - plone.app.transmogrifier: Plone specific additions.
> - quintagroup.transmogrifier: Plone specific additions. Mostly made
> obsolete by plone.app.Transmogrifier.
>
> - collective.jsonmigrator: Transmogrifier JSON importer.
> - collective.jsonify: JSON views for Plone content.
>
> Useful Links:
>
> Transmogrifier CSV import:
> http://shuttlethread.com/blog/importing-dexterity-content-via-csv
>
> Plone Conference Talk - Journeys with Transmogrifier & friends or How
> not to get stuck in the Plone dark ages - Daniel Jowett
> http://vimeo.com/110367183
>
>
> 4) For the sake of completeness: plone.app.dexterity content migrations:
> For Archetypes to plone.app.dexterity migrations, There are also
> plone.app.contenttypes migration steps. Pro and cons of point 1) apply,
> also currently object annotations are not migrated, AFAIK (no
> plone.app.discussion migrations).
>
>    For some examples on how to use plone.app.dexterity migration
> framework for external add-ons, look at collective.folderishtypes and
> collective.richdescription migrations.
>
>
> https://github.com/collective/collective.folderishtypes/blob/master/src/collective/folderishtypes/dx/migration/migrate_atdx_folderishtypes.py
>
> https://github.com/collective/collective.richdescription/blob/master/src/collective/richdescription/dx/migration/__init__.py
>
>
>
> Cheers, Johannes
>
>
>
>
> --
> programmatic  web development
> di(fh) johannes raggam / thet
> python plone zope development
> plone framework  team  member
> mail: office-//[email protected]
> web:  http://programmatic.pro
>       http://bluedynamics.com
>
>
>
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>


-- 
Mike Metcalfe

082 903 8268
mike-Aj4agZGutx/[email protected]
www.webtide.co.za

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