https://bugzilla.wikimedia.org/show_bug.cgi?id=54902

Derk-Jan Hartman <[email protected]> changed:

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--- Comment #17 from Derk-Jan Hartman <[email protected]> ---
In my experience, one of the most common reasons to use purge is post
infrastructure failures (the purge feed between main and caching centers has
been down), causing inconsistencies.

In other cases, it's almost always cached 'time dependent' content. The
category with speedy deletes not updating quick enough to the wikignomes liking
(job queue). Or calculated ages of article subjects for instance, that are no
longer up to date (because calculations are cached, which for time based
content, is thus inherently broken).

If we don't want to sacrifice flexibility and want to keep caching at the same
time, I would say that calculations based on time could have cache invalidation
timers associated with it. (more ugliness, but doable/manageable in Lua I
think).

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