https://bugzilla.wikimedia.org/show_bug.cgi?id=70189

Bawolff (Brian Wolff) <[email protected]> changed:

           What    |Removed                     |Added
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           Keywords|                            |ops

--- Comment #3 from Bawolff (Brian Wolff) <[email protected]> ---
Hmm, it would appear HTCP purge requests aren't being sent for that particular
page at that particular size (When I ?action=purge the image description page,
the age header resets for both the 1025px page 300 thumb, as well as the 1024px
page 301 thumb. However the 1024px page 300 thumb always stays the same). The
same behavior is observed both when acessing from eqiad, and when accessing
from esams.

When appending a random query paramaeter to the thumb url, the headers say
varnish cache miss, but still the same thumb is returned.

If I were to guess, I would guess that swift has a cached thumb of that page at
that size but it isn't being returned when MW gets a list of all thumbs for a
file, thus is not getting deleted during ?action=purge and is not having an
htcp packet sent. I've heard a couple other reports of similar things happening
before, but they have been very few and far between.

(I think that's as far as my debugging skills go. Someone with more knowledge
of/actual access to our swift servers would probably have to investigate
further. Unless someone has a better idea, I would suggest running various
swift commands from the command line (list and stat) and see what's up with
that particular thumbnail, and possibly deleting it manually)

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