https://bugzilla.wikimedia.org/show_bug.cgi?id=31680

Rob Lanphier <ro...@wikimedia.org> changed:

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--- Comment #12 from Rob Lanphier <ro...@wikimedia.org> 2011-11-16 21:33:47 UTC 
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Aaron Schulz and I did a fair amount of work trying to repro and investigate
this last night.  We didn't think to do the /etc/hosts trick, but one of our
theories was a Europe-only problem, so that makes sense.  We *did* repro a
thumbnailing problem, though it was only temporary and easily fixed with
?action=purge on the image description page.  I'm not sure we actually
reproduced the problem that's causing the most grief, but we did at least prove
it's possible (if not as easy) to see the problem on one of the North American
squid servers.

One theory we had: maybe it's a race condition, where the thumb is requested
after the image is updated, but before the thumb is generated, since the "Age:"
http header for the image was clearly younger than the upstream thumbnail
should have been.

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