Hello all,

Background and longer/more detailed discussion on this issue is in bug
44570:
https://bugzilla.wikimedia.org/show_bug.cgi?id=44570

Summary:
As we delete old -wmfX branches there appears to be cached pages that
reference old branch URLs, eg:
https://bits.wikimedia.org/static-1.21wmf1/skins/common/images/poweredby_mediawiki_88x31.png

(that 404s because 1.21wmf1 is long gone)


If you want to see my bad ASCII art representation of our current caching
layers, see this page:
http://wikitech.wikimedia.org/view/Caching_overview


So possible ways forward
========================

option 1:
* reduce parsercache timeout to size of deployment window (~28 days) [0]
* Tim may have knowledge why that shouldn't happen [1]

option 2:
* change away from version numbers in URLs [2]
** maybe use slots or something else
** skins?

option 3:
* status quo


What do you think?

Greg


[0] https://bugzilla.wikimedia.org/show_bug.cgi?id=44570#c14
[1] https://bugzilla.wikimedia.org/show_bug.cgi?id=44570#c12
[2] https://bugzilla.wikimedia.org/show_bug.cgi?id=44570#c15

-- 
| Greg Grossmeier            GPG: B2FA 27B1 F7EB D327 6B8E |
| [[User:Greg G (WMF)]]           A18D 1138 8E47 FAC8 1C7D |

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