https://bugzilla.wikimedia.org/show_bug.cgi?id=28782
Bug #: 28782
Summary: UploadWizard: thumbnails on live Commons often
missing; duplicate fetches of same thumbnail
Product: MediaWiki extensions
Version: any
Platform: All
OS/Version: All
Status: NEW
Severity: normal
Priority: Unprioritized
Component: UploadWizard
AssignedTo: [email protected]
ReportedBy: [email protected]
CC: [email protected]
Classification: Unclassified
Live Commons often is slow to generate thumbnails due to thumbnail server
overloading, or because the generation occurs in a shelled-out process.
Our stashImageInfo calls only return the URLs of where the thumbnails are
*supposed* to be. It doesn't mean these URLs won't return errors for some
amount of time.
The result is that thumbnails are not ready when they are asked for, resulting
in 404 errors. These errors are then cached within UploadWizard.
Related: we also fetch the same thumbnail (same specifications) too many times.
If we want the same thumbnail on two different pages it gets fetched twice.
The solution is to use a mini publish-and-subscribe system within the
UploadWizard, that checks for the availability of thumbnails and then updates
the interface when they are ready.
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