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Commons should use ChangeProp to inform wikis of renamed images
Open, Needs TriagePublic


Not sure if this is a problem with the wiki or MCS itself...

When using this query:

The response HTML includes a reference to this image: //

This leads to a 404, and causes MWOffliner to have missing images in scrapes:

Event Timeline

Hmm, so the file was renamed recently on 2018-02-10,

Asking for a purge (?action=purge) rerendered the page correctly,

It looks like, because Parsoid links directly to thumbnailed images, we need changeprop to tell us to rerender all the pages linking to the file. Hopefully renames are rare.

ssastry claimed this task.

There is nothing to do here on MCS or Parsoid end. @Pchelolo @mobrovac please reopean and reassign to changeprop OR create a new phab task for changeprop related to renames and rerendering.

ssastry triaged this task as Medium priority.

@ssastry I don't really understand why this ticket is closed. There is no agreement that this is a bug?

This is a serious matter for the offline versions of our wikis, the consequences of this are broken HTML articles (= with broken images). This is not rare, I have many examples only with Wikivoyage in English. Just the renaming of "File:BC-3_(Crowsnest).svg" breaks itself around 20 articles.

And not only it generates broken HTML, but also this makes detecting our own scraping/rendering problems on MWoffliner side more complicated. Our own quality processes are challenged.

I'm also sure this has also an impact on other tools based on Parsoid output. Considering the level of impact, I would like to see this ticket re-opened, properly assigned and triaged adequately.

ssastry raised the priority of this task from Medium to Needs Triage.
ssastry edited projects, added ChangeProp; removed Mobile-Content-Service, Parsoid.

@Kelson. Sorry, I didn't imply this wasn't a bug. I did say this is a ChangePropagation issue and tagged @Pchelolo and @mobrovac and asked them to reopen / file a diferent ticket. But, yes a better solution would have been to untag Parsoid and MCS and tag ChangePropagation, which I am going to do now. Thanks for following up and apologies for my confusing triage.

@bearND I've left behind the RI-Team-Backog tag and removed the MCS tag. But, feel free to update your team / project tags as appropriate.

Still a new case here:, 15 days after image renaming on Commons (, the rendered HTML still points to a the wrong/old/404 thumbnail.

This impacts the whole Parsoid, not only mobile.

T284570 is a similar case where a file was moved from enwiki to commons and changeprop did not request to rerender the pages including it.

Aklapper renamed this task from Mobile-Sections returns missing images to After renaming image files on Commons, MCS still points to old 404 thumbnail URLs.Jul 10 2021, 6:59 PM
Aklapper removed a subscriber: bearND.
TheDJ renamed this task from After renaming image files on Commons, MCS still points to old 404 thumbnail URLs to Commons should use ChangeProp to inform wikis of renamed images.Feb 6 2023, 3:36 PM