No duplicate warnings are ever produced for chunked uploads.
To reproduce, check "Chunked uploads for files over 5 MB in Upload Wizard" in Commons preferences, then try uploading such a file that has a copy on Commons (e.g. https://commons.wikimedia.org/wiki/File:Baden-Baden_10-2015_img41_Pump_house.jpg).
| Subject | Repo | Branch | Lines +/- | |
|---|---|---|---|---|
| Check for warnings for assembled file after a chunked upload | mediawiki/core | master | +17 -1 |
In UploadWizard, these fail later with a different error code, after the user fills in the description and stuff:
select left(timestamp,6), count(*) from UploadWizardErrorFlowEvent_11772725 where event_code like 'upload-error-duplicate%' group by left(timestamp,6);
+-------------------+----------+ | left(timestamp,6) | count(*) | +-------------------+----------+ | 201504 | 96 | | 201505 | 467 | | 201506 | 250 | | 201507 | 206 | | 201508 | 424 | | 201509 | 472 | | 201510 | 107 | | 201511 | 142 | | 201512 | 86 | | 201601 | 109 | | 201602 | 174 | | 201603 | 215 | +-------------------+----------+ 12 rows in set (0.16 sec)
For MediaWiki-Action-API I'd close this as invalid as written, since the warning is in fact produced when the chunked upload is eventually "committed" as an upload-from-stash. But since this seems to actually be intended as an UploadWizard bug, I'll just remove the tag instead.
Yeah, but what's the point of printing warnings when you've already published that file? They're supposed to warn you before you do it. In UploadWizard, we want to display them before we allow the user to publish the file, but the only way to get them after completing the upload to stash is to attempt publishing.
I'm pretty sure this is actually an API issue, but don't worry, I'll be fixing it myself.
Change 305284 had a related patch set uploaded (by Bartosz Dziewoński):
Check for warnings for assembled file after a chunked upload
Change 305284 merged by jenkins-bot:
Check for warnings for assembled file after a chunked upload
Funnily, just as I was finally fixing this, someone reported a problem where this was the underlying issue: https://commons.wikimedia.org/wiki/Commons:Upload_help#File_from_Flickr