https://bugzilla.wikimedia.org/show_bug.cgi?id=49362

--- Comment #9 from Bawolff (Brian Wolff) <[email protected]> ---
(In reply to comment #8)
> *Commons users (I asked a small sample of users on irc) complain that often
> on
> overwriting a file, cache is not purged initially, but ?action=purge works.
> This isn't really consistent with the large-number-of-old-versions issue, so
> I
> suspect that it is a separate issue.

At first I was wondering if maybe there is some race condition type issue
(Image gets recached before new one fully gets committed to swift) However
looking at recently overwritten image that does not appear to be the case.

For example, consider
https://commons.wikimedia.org/wiki/File:Mari_Possa,_Teagan_Presley_at_Digital_Playground_Party_1.jpg

When I visited it at roughly 15:08 (about a minute and a half after it was
re-uploaded), the main version of the image
(https://upload.wikimedia.org/wikipedia/commons/6/6f/Mari_Possa%2C_Teagan_Presley_at_Digital_Playground_Party_1.jpg
) had been purged 85 seconds ago, which was consistent with the reupload time
(It should be noted that that is the full image, and not a thumb which is
possibly handled from a different code path).

However the thumb in the history section (
https://upload.wikimedia.org/wikipedia/commons/thumb/6/6f/Mari_Possa%2C_Teagan_Presley_at_Digital_Playground_Party_1.jpg/120px-Mari_Possa%2C_Teagan_Presley_at_Digital_Playground_Party_1.jpg
)
had an age of 13247 (about 3 hours 40 min). Which means no purge was received
for it during the reupload process.

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