https://bugzilla.wikimedia.org/show_bug.cgi?id=49773

       Web browser: ---
            Bug ID: 49773
           Summary: [SMW 1.8.0.5] upgrade from 1.7.x fails on MW 1.18.3
                    when transitioning with SMWSQLStore2
           Product: MediaWiki extensions
           Version: unspecified
          Hardware: All
                OS: All
            Status: NEW
          Severity: normal
          Priority: Unprioritized
         Component: Semantic MediaWiki
          Assignee: [email protected]
          Reporter: [email protected]
                CC: [email protected], [email protected],
                    [email protected], [email protected]
    Classification: Unclassified
   Mobile Platform: ---

This problem was initially discussed here:

http://wikimedia.7.x6.nabble.com/SMW-upgrade-1-7-1-to-1-8-0-5-failed-what-s-wrong-tp5006725.html

I have:

* MediaWiki 1.18.3
* SMW 1.7.1

I followed these instructions

https://semantic-mediawiki.org/wiki/Help:Installation#With_shell_access

I added to LocalSettings.php:

$smwgDefaultStore = 'SMWSQLStore2';

I deleted the old Validator and SemanticMediaWiki directories, and then
extracted SMW 1.8.0.5. Then, I ran:

php /path/to/extensions/SemanticMediaWiki/maintenance/SMW_setup.php -b
SMWSQLStore3;

After that, the instructions say:

"The wiki should now work as normal, but using the old storage structures."

But, no queries return any data. The documentation indicates that this is not
the desired result of this process, hence this bug report. 

However, maybe MediaWiki 1.18.3 is no longer fully supported, and the
documentation should be updated to reflect that? If so, then this bug report
should be closed as WONTFIX, and then I can follow the updated instructions for
upgrading to SMW 1.8.x.x, and the minimum requirements for SMW can have MW 1.18
removed. I suspect that a simultaneous upgrade to MediaWiki 1.19 or later would
be required in that case. Being able to upgrade one component at a time would
help with bug hunting, and would also hopefully reduce the disruption to an
operating site. 

Right now, I'm considering the possibility that I should warn the users to
expect downtime, and upgrade everything and do all my bug hunting in one shot
over the course of a few days.

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