Lucas_Werkmeister_WMDE added a comment.

  In T271618#6761474 <https://phabricator.wikimedia.org/T271618#6761474>, 
@Lucas_Werkmeister_WMDE wrote:
  
  > I wonder if any jobs were missed when Q102585843 was merged into Q41805462 
– maybe we can look that up in logstash. (Compare T270522: [16hrs] Investigate 
Infrequent JobQueueErrors on Wikidata 
<https://phabricator.wikimedia.org/T270522>.)
  
  No errors about failed job queue inserts per se, but there are several 
occurrences of the `UnresolvedEntityRedirectException` on enwiki around that 
time, including in jobs. In chronological order:
  
  - POST to `/w/api.php`, with stack trace rooted in `ApiParse`, so presumably 
an `action=parse` request
  - two more `ApiParse` POSTs, each ca. half a second after the previous one
  - three `RunSingleJob` requests, with stack trace rooted in `RefreshLinksJob`
  - another `ApiParse`, but this time as GET 
(`/w/api.php?action=parse&format=json&page=Vincent_Crawford`, so nothing overly 
suspicious in the params)
  
  In each case, the `UnresolvedEntityRedirectException` is ultimately reached 
through a Lua call to `entityExists()`, so I suppose that is what we should 
fix. I can’t quite explain the appearance and disappearance of the error based 
on the edits that affected it, but I assume that those edits somehow influenced 
the entity ID that the on-wiki Lua module passed into `entityExists()` – maybe 
the function was called with “the entity ID linked to the current page”, and 
that sometimes still pointed to the double-redirect entity and then was updated 
somehow.

TASK DETAIL
  https://phabricator.wikimedia.org/T271618

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To: Lucas_Werkmeister_WMDE
Cc: Lucas_Werkmeister_WMDE, Lydia_Pintscher, Majavah, Aklapper, Caius_G, 
Akuckartz, Iflorez, darthmon_wmde, alaa_wmde, Nandana, Lahi, Gq86, 
GoranSMilovanovic, QZanden, LawExplorer, _jensen, rosalieper, Scott_WUaS, 
Jonas, Verdy_p, Wikidata-bugs, aude, Jdforrester-WMF, Mbch331, Rxy, Jay8g
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