hashar created this task.
hashar added projects: Wikimedia-production-error, Wikidata-Campsite, Wikidata.
Restricted Application added a subscriber: Aklapper.
Restricted Application added a project: wdwb-tech.

TASK DESCRIPTION
  Error
  -----
  
  - mwversion: `1.37.0-wmf.21`
  - reqId: `ee3838d2b6cab768bfb19645`
  - Find reqId in Logstash 
<https://logstash.wikimedia.org/app/dashboards#/view/AXFV7JE83bOlOASGccsT?_g=(time:(from:'2021-09-15T20:35:44.000Z',to:'2021-09-16T19:16:29.627Z'))&_a=(query:(query_string:(query:'reqId:%22ee3838d2b6cab768bfb19645%22')))>
  - Find normalized_message in Logstash 
<https://logstash.wikimedia.org/app/dashboards#/view/AXFV7JE83bOlOASGccsT?_g=(time:(from:now-30d,to:now))&_a=(query:(query_string:(query:'normalized_message:%22%5B%7BreqId%7D%5D%20%7Bexception_url%7D%20%20%20Wikibase%5CLib%5CStore%5CRevisionedUnresolvedRedirectException:%20Unresolved%20redirect%20from%20Q100917584%20to%20Q95304986%22')))>
  
  
  
  name=normalized_message
    [{reqId}] {exception_url}   
Wikibase\Lib\Store\RevisionedUnresolvedRedirectException: Unresolved redirect 
from Q100917584 to Q95304986
  
  
  
  name=exception.trace
    from 
/srv/mediawiki/php-1.37.0-wmf.21/extensions/Wikibase/lib/includes/Store/Sql/WikiPageEntityRevisionLookup.php(118)
    #0 
/srv/mediawiki/php-1.37.0-wmf.21/extensions/Wikibase/lib/includes/Store/TypeDispatchingEntityRevisionLookup.php(54):
 
Wikibase\Lib\Store\Sql\WikiPageEntityRevisionLookup->getEntityRevision(Wikibase\DataModel\Entity\ItemId,
 integer, string)
    #1 
/srv/mediawiki/php-1.37.0-wmf.21/extensions/Wikibase/data-access/src/ByTypeDispatchingEntityRevisionLookup.php(55):
 
Wikibase\Lib\Store\TypeDispatchingEntityRevisionLookup->getEntityRevision(Wikibase\DataModel\Entity\ItemId,
 integer, string)
    #2 
/srv/mediawiki/php-1.37.0-wmf.21/extensions/Wikibase/lib/includes/Store/CachingEntityRevisionLookup.php(104):
 
Wikibase\DataAccess\ByTypeDispatchingEntityRevisionLookup->getEntityRevision(Wikibase\DataModel\Entity\ItemId,
 integer, string)
    #3 
/srv/mediawiki/php-1.37.0-wmf.21/extensions/Wikibase/lib/includes/Store/CachingEntityRevisionLookup.php(87):
 
Wikibase\Lib\Store\CachingEntityRevisionLookup->fetchEntityRevision(Wikibase\DataModel\Entity\ItemId,
 integer, string)
    #4 
/srv/mediawiki/php-1.37.0-wmf.21/extensions/Wikibase/lib/includes/Store/CachingEntityRevisionLookup.php(104):
 
Wikibase\Lib\Store\CachingEntityRevisionLookup->getEntityRevision(Wikibase\DataModel\Entity\ItemId,
 integer, string)
    #5 
/srv/mediawiki/php-1.37.0-wmf.21/extensions/Wikibase/lib/includes/Store/CachingEntityRevisionLookup.php(87):
 
Wikibase\Lib\Store\CachingEntityRevisionLookup->fetchEntityRevision(Wikibase\DataModel\Entity\ItemId,
 integer, string)
    #6 
/srv/mediawiki/php-1.37.0-wmf.21/extensions/Wikibase/client/includes/Changes/ChangeRunCoalescer.php(173):
 
Wikibase\Lib\Store\CachingEntityRevisionLookup->getEntityRevision(Wikibase\DataModel\Entity\ItemId,
 integer, string)
    #7 
/srv/mediawiki/php-1.37.0-wmf.21/extensions/Wikibase/client/includes/Changes/ChangeRunCoalescer.php(294):
 
Wikibase\Client\Changes\ChangeRunCoalescer->mergeChanges(Wikibase\DataModel\Entity\ItemId,
 array)
    #8 
/srv/mediawiki/php-1.37.0-wmf.21/extensions/Wikibase/client/includes/Changes/ChangeRunCoalescer.php(81):
 
Wikibase\Client\Changes\ChangeRunCoalescer->coalesceRuns(Wikibase\DataModel\Entity\ItemId,
 array)
    #9 
/srv/mediawiki/php-1.37.0-wmf.21/extensions/Wikibase/client/includes/Changes/ChangeHandler.php(90):
 Wikibase\Client\Changes\ChangeRunCoalescer->transformChangeList(array)
    #10 
/srv/mediawiki/php-1.37.0-wmf.21/extensions/Wikibase/client/includes/ChangeNotificationJob.php(113):
 Wikibase\Client\Changes\ChangeHandler->handleChanges(array, array)
    #11 
/srv/mediawiki/php-1.37.0-wmf.21/extensions/EventBus/includes/JobExecutor.php(79):
 Wikibase\Client\ChangeNotificationJob->run()
    #12 /srv/mediawiki/rpc/RunSingleJob.php(76): 
MediaWiki\Extension\EventBus\JobExecutor->execute(array)
    #13 {main}
  
  
  
  Impact
  ------
  
  Notes
  -----
  
  Similar to T283862 <https://phabricator.wikimedia.org/T283862>
  
  It happened a few times, each time causing the exception for the set of 
wikis: cswiki/nowiki/vowiki/euwiki/arwiki
  
  Looks like a data side error rather than a code one

TASK DETAIL
  https://phabricator.wikimedia.org/T291215

EMAIL PREFERENCES
  https://phabricator.wikimedia.org/settings/panel/emailpreferences/

To: hashar
Cc: Aklapper, hashar, Invadibot, maantietaja, Akuckartz, darthmon_wmde, 
Nandana, Lahi, Gq86, GoranSMilovanovic, QZanden, LawExplorer, _jensen, 
rosalieper, Scott_WUaS, Verdy_p, Wikidata-bugs, aude, Lydia_Pintscher, 
Jdforrester-WMF, Addshore, Mbch331, Jay8g
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