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Special:UnconnectedPages on en.wiki lists very stale connected pages
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Description

Special:UnconnectedPages on en.wiki - https://en.wikipedia.org/wiki/Special:UnconnectedPages?limit=500&namespace=0 - describes its purpose as "This page lists pages with no connected data item", but in fact lists en.wiki pages that do have wikidata items.

By way of example, at the time of writing - 00:32 26January 2019, Special:UnconnectedPages is listing https://en.wikipedia.org/wiki/River_Cottage_Spring which was linked to a wikidata item https://www.wikidata.org/wiki/Q60739876 at 14:15, 21 January 2019 - which is to say it is listing a page that was linked 4.5 days ago.

BDD
As an en.wikipedia user I expect that when I click on Special:UnconnectedPages the application returns a list of en.wikipedia article pages that are unconnected to Wikidata.

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Event Timeline

Tagishsimon created this task.Jan 26 2019, 12:39 AM
Restricted Application added a subscriber: Aklapper. · View Herald TranscriptJan 26 2019, 12:39 AM
Jdforrester-WMF added a project: Wikidata.Jan 26 2019, 12:50 AM
Lydia_Pintscher added subscribers: Ladsgroup, Addshore, Lydia_Pintscher.Jan 26 2019, 4:13 PM

@Addshore @Ladsgroup: Any idea what could be up here?

Ladsgroup added a comment.Jan 26 2019, 4:21 PM

IIRC, UnconnectedPages is a QueryPage which means it caches results. I need to dig deeper here.

Ladsgroup added a comment.Feb 5 2019, 3:27 PM

I was wrong, the result of UnconnectedPages is not cached (it should be, but that's another story). I can't reproduce the issue as there's nothing connected in the top ten but the reason can be because page_props table didn't get updated as it needs ParserCache purge to get updated. We can't do much about that and it's sorta by design to avoid performance degradation.

matej_suchanek mentioned this in T226900: Special:Unconnectedpages displays pages connected with a Wikidata item.Jul 4 2019, 3:54 PM
Addshore added a comment.Jan 15 2020, 12:10 PM

Related to T233520 but the timeline doesn't quite line up, so I might leave this open for now...

jeblad subscribed.Feb 25 2020, 2:35 PM
This comment was removed by jeblad.
matej_suchanek added a project: TestMe.Mar 8 2020, 10:11 AM
Mike_Peel subscribed.Jan 28 2021, 9:58 PM

I'm working through unconnected pages via a bot task at the moment, and that will probably clear most of the stale items (by purging the cache), but it would be good if this was properly fixed.

PeterBowman subscribed.Mar 8 2021, 10:34 PM
Addshore closed this task as a duplicate of T233520: Wikidata changes do not get sent to client sites on initial sitelink addition (in some cases), leading to things such as missing page props in page_props table.May 7 2021, 9:29 PM
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