https://bugzilla.wikimedia.org/show_bug.cgi?id=41130

--- Comment #8 from Aaron Schulz <[email protected]> 2012-10-23 20:27:50 
UTC ---
Doing a purge and monitoring the swift logs shows no DELETE issued for
640px-Mediawiki-versionsvergleich.png (though it does for a good number of
other sizes). After HEAD/GETing the object from swift (which triggered its
creation in swift), I then purged the file again. This purged the squids and
fixed that problem.

The general problem is the following:
* A user does ?action=purge or uploads a new file
* MW gets the list of thumbnails in swift
* MW purges those thumbnails out of swift
* MW purges the squids for those thumbnails but fails for some/all (maybe due
to some random network problem)
* A user purges the pages again
* MW gets a list of the thumbnails in swift (which does not include the bad
ones the user sees since they *were* purged from swift, just not the squids)
* MW purges those thumnails out of swift
* MW purges the squids for those thumbnails (which does not include the bad
ones)
* User is still confused...

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