Summary: Cannot upload multiple files simultaneously on live
Product: MediaWiki extensions
CC: gpaum...@wikimedia.org, asha...@wikimedia.org
When deploying this to live Commons, Roan Kattouw and I noticed that multiple
file uploads usually had one mysterious failure.
Roan determined that the records of some uploaded files were disappearing from
the $_SESSION record.
Changing UploadWizard's configuration such that it only uploaded one file after
another fixed the problem. (maxSimultaneousUploads = 1)
Speculation: there seems to be some race condition with updating, or possibly
creating, the $_SESSION data structures that the UploadWizard depends upon. So
forcing them to go one-at-a-time fixed the problem. It may be that we should do
an initial call to some API to create the data structures for all the uploading
files first in one shot, then actually kick off uploads.
Simultaneous uploads are a very useful feature especially for large files, so
we really ought to fix this. However it's not a blocker per se.
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