Last modified: 2013-05-24 18:01:44 UTC

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Bug 20560 - Data lost when moving page?
Data lost when moving page?
Status: REOPENED
Product: MediaWiki extensions
Classification: Unclassified
Semantic MediaWiki (Other open bugs)
unspecified
All All
: Normal major (vote)
: ---
Assigned To: Markus Krötzsch
: testme
Depends on:
Blocks:
  Show dependency tree / graph
 
Reported: 2009-09-09 09:24 UTC by Markus Krötzsch
Modified: 2013-05-24 18:01 UTC (History)
4 users (show)

See Also:
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Mobile Platform: ---
Assignee Huggle Beta Tester: ---

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Description Markus Krötzsch 2009-09-09 09:24:07 UTC 
I have observed at least one case where moving a page did not successfully move its data along. If this is systematic, this would by a critical bug. For now, this needs more investigation to be confirmed.

The wiki where the problem occurred was running MW 1.14alpha (r44498) and SMW 1.5f.
Comment 1 Markus Krötzsch 2010-05-27 12:11:18 UTC 
No such bug appeared again, but a possibly related issue (with a reproducible cause) was reported in Bug 23189. Closing this report.
Comment 2 Chris Davis 2011-04-07 22:00:18 UTC 
I'm running into the same issue with Mediawiki 1.16.2 and SMW 1.5.6.  To duplicate this, I create a page with a single property, move it, and then can use Special:ExportRDF to verify that the data has not been moved.  If I edit and then save the page, then the output of Special:ExportRDF is then updated correctly.
Comment 3 Chris Davis 2011-09-26 12:21:38 UTC 
I'm still seeing a version of this error when using Mediawiki 1.17.0 and Semantic MediaWiki 1.6.1.  I'm able to reproduce it using the method mentioned in my previous comment.  What happens now is that I get the data stored on both the old page and the new page (seen when using Special:ExportRDF).  Re-saving the old page which contains the redirect does not fix it.  

As a note about possible user error, I'm using a caching proxy server (squid), but I make sure to purge the cache of the pages generated by Special:ExportRDF (i.e. I purge http://.../Special:ExportRDF/TestPage1 and TestPage2).
Comment 4 Mark A. Hershberger 2012-03-09 05:35:00 UTC 
Lowering priority.  Please do not raise the priority unless you are planning to fix this.
Comment 5 Markus Krötzsch 2012-11-01 18:22:17 UTC 
Updating priority. It would be good to test this again with recent code to see if there is such a problem or not.
Comment 6 Dr Ishmael 2013-05-24 18:01:44 UTC 
We are encountering this problem on the Guild Wars 2 Wiki (http://wiki.guildwars2.com/wiki/Special:Version MW 1.20.5 / SMW 1.8.0.4).  The servers are owned and administered by ArenaNet, so I don't know all the details, but I know they are running a master/slave database configuration and a Varnish cache (also don't know whether that matters or not).

When a page is moved with redirect, its properties are all duplicated.  Deleting the redirect does nothing, but deleting the page and restoring it (or editing the page to remove the properties and then reverting) will rebuild the properties correctly.
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