https://bugzilla.wikimedia.org/show_bug.cgi?id=41130
--- Comment #79 from Bawolff (Brian Wolff) <bawolff...@gmail.com> ---
(In reply to comment #77)
> (In reply to comment #76)
> > The original posting (comment 0) covered three different issues.
>
> Two. The 404 issue was split into a separate bug and fixed. Everything else
> is
> the same issue. A purge is a purge no matter if it is triggered by an
> ?action=purge or by reuploading a file. From what I know both do the same.
> Both
> fail randomly for over a year now.
>
> Comment 75 explains this very well (thank you very much). His point 1
> ("Squid/varnish cache contains images that aren't in Swift") is not a
> separate
> issue. It is an effect of point 2 ("Multicast purge requests don't make it to
> all of the Varnish & Squid caches").
What? No. Not sending a purge at all is completely different from the purge
being lost along the way. Different causes and different symptoms. Of course
without the multicast issue the local file cache would not be so out of sync
and as a result the squid/varnish cache has things not in swift bug would
appear very rarely to the point where it probably wouldn't be noticed.
>
> Bug 41130 was created because bug 31680 was assigned to the wrong developers.
> It became clear that this is not a MediaWiki bug. However bug 31680 was not
> closed or reassigned because there *is* something the MediaWiki developers
> should do. They should implement a workaround to help us break out of that
> deadlock situation. See comment 16 and several others. No one ever replied to
> that (maybe because it should be moved to bug 31680).
There is a work around (albeit an unintuitive one). The reason it didnt work
(at the time comment 16 was made) was because (in my not entirely substantiated
opinion) this bug was misdiagonosed as being about files in swift being out of
sync with files in varnish when actually the bug was due to varnishhtcpd being
borked.
>
> Five days ago bug 31680 was reassigned. Now it is a duplicate.
>
> > needs a separate report.
>
> I will not create more reports with the same issue. In the past they were all
> closed as duplicates.
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