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

--- Comment #13 from TMg <[email protected]> 2012-10-25 11:43:20 UTC ---
If I look at the file names there is kind of a "wildcard" system:

http://upload.wikimedia.org/wikipedia/commons/thumb/x/xx/xxx.png/1px-xxx.png
http://upload.wikimedia.org/wikipedia/commons/thumb/x/xx/xxx.png/2px-xxx.png
http://upload.wikimedia.org/wikipedia/commons/thumb/x/xx/xxx.png/3px-xxx.png

... and so on up to the maximum image width.

Why not simply purge all possible thumbnail sizes? This should be a no-op for
non-existing thumbnail sizes and therefor not affect the performance.

Why is it not possible to get a list of all non-purged thumbnail sizes?
According to the explanation above you are asking "swift" for the list of
thumbnails to purge the "squids". Why not ask the squids? Why don't you purge
the squids first and skip purging the swift if something went wrong?

I know all this is just working around the problem. The main question is: Why
does purging the squids fail sometimes?

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