https://bugzilla.wikimedia.org/show_bug.cgi?id=49118
Web browser: ---
Bug ID: 49118
Summary: Limit number of image scaling attempts
Product: MediaWiki
Version: unspecified
Hardware: All
OS: All
Status: NEW
Severity: normal
Priority: Unprioritized
Component: File management
Assignee: [email protected]
Reporter: [email protected]
CC: [email protected], [email protected]
Classification: Unclassified
Mobile Platform: ---
Currently, requests for thumbnails are attempted, then possibly failed (e.g.
due to memory limits reached, or imagemagick crashing), then retried until the
end of time, as long as someone requests such a URL. There are some known
offenders, like a 3MB animated DNA Helix image I've been seeing on imagescalers
for months. There are also incidents such as this:
-rw-r--r-- 1 apache apache 19K May 25 11:46 localcopy_0ef74f0b53b6-1.svg
-rw-r--r-- 1 apache apache 19K May 25 21:30 localcopy_ca923e0f99a6-1.svg
-rw-r--r-- 1 apache apache 19K May 26 10:48 localcopy_572f861613b9-1.svg
-rw-r--r-- 1 apache apache 19K May 26 11:18 localcopy_def9292ef643-1.svg
-rw-r--r-- 1 apache apache 19K May 26 11:19 localcopy_0572c50518be-1.svg
-rw-r--r-- 1 apache apache 19K May 26 12:01 localcopy_304cb07a6b45-1.svg
-rw-r--r-- 1 apache apache 19K May 26 13:14 localcopy_fb22d6ef358b-1.svg
-rw-r--r-- 1 apache apache 19K May 26 13:19 localcopy_16568ad8072b-1.svg
-rw-r--r-- 1 apache apache 19K May 26 13:44 localcopy_0a9a32f4877c-1.svg
-rw-r--r-- 1 apache apache 19K May 26 14:23 localcopy_813c0c9416bc-1.svg
-rw-r--r-- 1 apache apache 19K May 26 15:58 localcopy_969e57b3aec0-1.svg
-rw-r--r-- 1 apache apache 19K May 26 16:34 localcopy_de13c2c069d6-1.svg
-rw-r--r-- 1 apache apache 19K May 26 17:54 localcopy_6e9b4a4aafbc-1.svg
-rw-r--r-- 1 apache apache 19K May 27 09:09 localcopy_15e927467d8f-1.svg
-rw-r--r-- 1 apache apache 19K May 27 10:09 localcopy_8e31a32bf69a-1.svg
-rw-r--r-- 1 apache apache 19K May 27 12:37 localcopy_9fb1ac64e9d2-1.svg
-rw-r--r-- 1 apache apache 19K May 27 12:38 localcopy_7f2b88f782a3-1.svg
-rw-r--r-- 1 apache apache 19K May 28 02:46 localcopy_72abccb50bdf-1.svg
-rw-r--r-- 1 apache apache 19K May 28 02:46 localcopy_aa5f4680fab2-1.svg
-rw-r--r-- 1 apache apache 19K May 28 02:50 localcopy_8023d355393a-1.svg
-rw-r--r-- 1 apache apache 19K May 28 11:19 localcopy_f2dab828e134-1.svg
-rw-r--r-- 1 apache apache 19K May 29 16:05 localcopy_0ebbf8feb6a7-1.svg
-rw-r--r-- 1 apache apache 19K May 29 18:45 localcopy_c5f2dbd0d36d-1.svg
-rw-r--r-- 1 apache apache 19K May 29 18:58 localcopy_4a87fe4aa75f-1.svg
-rw-r--r-- 1 apache apache 19K May 29 20:40 localcopy_b9df425c39f7-1.svg
-rw-r--r-- 1 apache apache 19K May 29 20:42 localcopy_68fafb94b201-1.svg
-rw-r--r-- 1 apache apache 19K May 29 20:43 localcopy_28e26296e19c-1.svg
-rw-r--r-- 1 apache apache 19K May 29 20:51 localcopy_83c7795c9538-1.svg
-rw-r--r-- 1 apache apache 19K May 29 20:54 localcopy_923d3ff45ad6-1.svg
-rw-r--r-- 1 apache apache 19K May 29 20:55 localcopy_ff8795390f2e-1.svg
-rw-r--r-- 1 apache apache 19K May 30 05:35 localcopy_728ca2ce9d32-1.svg
-rw-r--r-- 1 apache apache 19K May 30 10:14 localcopy_3a483ff65908-1.svg
-rw-r--r-- 1 apache apache 19K May 30 16:58 localcopy_bde12d83680d-1.svg
-rw-r--r-- 1 apache apache 19K May 30 16:59 localcopy_12aa3e76ef45-1.svg
-rw-r--r-- 1 apache apache 19K May 30 17:00 localcopy_078234140633-1.svg
-rw-r--r-- 1 apache apache 19K May 31 16:44 localcopy_1b44bb384189-1.svg
-rw-r--r-- 1 apache apache 19K Jun 1 15:14 localcopy_d71bc6e4f94d-1.svg
-rw-r--r-- 1 apache apache 19K Jun 2 17:53 localcopy_c3d7a0a674a5-1.svg
-rw-r--r-- 1 apache apache 19K Jun 3 15:16 localcopy_f17379c9ae4a-1.svg
Please implement a way of a limit on the number of attempts (3-5 should be
enough) in the backend. Other options, such as Swift/Varnish caching the 500
after two or three restarts were considered and discussed but they're uglier
and harder to implement. Having MediaWiki do it when a scaling attempt fails
instead looks like the more reasonable way to go.
We should also have a way of resetting such a counter either per image or en
masse, as the underlying causes of the failure could be fixed in the meantime
(e.g. a newer imagemagick version, an increase of our memory limits, a
MediaWiki bug getting fixed etc.)
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