On Sat, Sep 15, 2012 at 8:52 AM, Vincent Massol <[email protected]> wrote: > Hi devs, > > Just wanted to share my vision of how we should tackle migrating to the new > Model. I see the following steps: > > * Step 1: Define new model interfaces (status: in progress) > * Step 2: Implement a "bridged" version which uses the oldcore (status: in > progress). > * Step 3: Start moving code to use the new API as the new API and its > implementation progress. Note: we should start using the produce of step1 and > step2 ASAP to tune the details (status: not started) > * Step 4: At the same time, start a new implementation based on a RDBMS > (probably hibernate-based, to be decided) (status: not started). I'd also > like that we start other implementations not based on a RDBMS just to prove > that it works with other storages. Ideally I'd like some NoSQL impl (Caleb > maybe?) and I'd also like to try a Git-based implementation (using jgit) > * Step 5: Deprecate all our search apis located in XWikiHibernateStore and > make everyone use the new QueryManager module. This needs some tuning on the > QueryManager for missing stuff but that's doable (I need to send some > proposal on missing stuff). (status: in progress). The idea here is to > decouple search from storage. Note that we'll need to write some translator > from HQL to XWQL or the new search query language. > * Step 6: As we progress in step 2, 3, 4, introduce a configuration parameter > to decide which implementation to use ("bridged", etc) so that users can > start playing with new implementations (status: not started) > * Step 7: Rewrite a new Importer/Exporter that exports everything (all the > data in the current DB) + all configuration files/data. To see what we are > currently not exporting, see > http://platform.xwiki.org/xwiki/bin/view/AdminGuide/Backup#HUsingtheXWikiExportfeature > This new exporter should probably be based on the XWiki Streams module being > developed here: https://github.com/xwiki-contrib/wiki-stream (status: in > progress but not active) > * Step 8: When users want to migrate from one implementation ("bridged" for > ex) to a new implementation they export their wiki, set the new > implementation in the configuration file and reimport. (status: not started)
Sounds good but just to be clear it's not steps that has to be fully completed one after another, right ? > > For me Step3 can almost begin (I probably need one or 2 more weeks to be > ready to have some use cases implemented and I'll send a vote to merge my > work in feature-newmodel branch in master - Would be good if you guys start > looking at it and give comments to be ready for this). Yes we need to start step3 ASAP (I insist on the fact that it does not require steps 1 and 2 to be fully completed, we should keep the API experimental as long as we don't are fully happy with it), that's the only way to do a good API for us IMO. > > Then we need volunteer for Step 4 for: > * new RDBMS implementation. Who? > * noSQL impl. Cassandra? other? Who? > * git implementation. Vincent > > WDYT about the plan? > > In term of time required it's probably going to take us about a year to have > a first working version for all the steps by working at a leisurely pace. I would say probably more than that unless we really push on it. > > Thanks > -Vincent > > _______________________________________________ > devs mailing list > [email protected] > http://lists.xwiki.org/mailman/listinfo/devs -- Thomas Mortagne _______________________________________________ devs mailing list [email protected] http://lists.xwiki.org/mailman/listinfo/devs
