Ladsgroup added a comment.
So this is the backtrace when you set `$wgWBRepoSettings['useEntitySourceBasedFederation'] = true;`: /var/lib/mediawiki2/extensions/Wikibase/lib/includes/Store/Sql/WikiPageEntityMetaDataLookup.php:106 /var/lib/mediawiki2/extensions/Wikibase/lib/includes/Store/Sql/TypeDispatchingWikiPageEntityMetaDataAccessor.php:88 /var/lib/mediawiki2/extensions/Wikibase/lib/includes/Store/Sql/PrefetchingWikiPageEntityMetaDataAccessor.php:264 /var/lib/mediawiki2/extensions/Wikibase/lib/includes/Store/Sql/PrefetchingWikiPageEntityMetaDataAccessor.php:186 /var/lib/mediawiki2/extensions/Wikibase/lib/includes/Store/Sql/WikiPageEntityRevisionLookup.php:125 /var/lib/mediawiki2/extensions/Wikibase/data-access/src/ByTypeDispatchingEntityRevisionLookup.php:54 /var/lib/mediawiki2/extensions/WikibaseLexeme/src/DataAccess/Store/SenseRevisionLookup.php:55 /var/lib/mediawiki2/extensions/Wikibase/lib/includes/Store/TypeDispatchingEntityRevisionLookup.php:54 /var/lib/mediawiki2/extensions/Wikibase/lib/includes/Store/CachingEntityRevisionLookup.php:104 /var/lib/mediawiki2/extensions/Wikibase/lib/includes/Store/CachingEntityRevisionLookup.php:87 /var/lib/mediawiki2/extensions/Wikibase/lib/includes/Store/CachingEntityRevisionLookup.php:104 /var/lib/mediawiki2/extensions/Wikibase/lib/includes/Store/CachingEntityRevisionLookup.php:87 /var/lib/mediawiki2/extensions/Wikibase/repo/includes/Api/GetEntities.php:275 /var/lib/mediawiki2/extensions/Wikibase/repo/includes/Api/GetEntities.php:257 /var/lib/mediawiki2/extensions/Wikibase/repo/includes/Api/GetEntities.php:136 /var/lib/mediawiki2/includes/api/ApiMain.php:1595 /var/lib/mediawiki2/includes/api/ApiMain.php:500 /var/lib/mediawiki2/tests/phpunit/includes/api/ApiTestCase.php:106 /var/lib/mediawiki2/extensions/Wikibase/repo/tests/phpunit/includes/Api/WikibaseApiTestCase.php:156 /var/lib/mediawiki2/extensions/WikibaseLexeme/tests/phpunit/mediawiki/Api/LexemeGetEntitiesTest.php:105 /var/lib/mediawiki2/tests/phpunit/MediaWikiTestCase.php:427 /var/lib/mediawiki2/maintenance/doMaintenance.php:99 This is a big red herring and waste of time, I looked at everything in depth and nothing was responsible. The part that is actually responsible is EntityPrefetcher. GetEntities do prefetch and when you disable EntitySourceBasedFederation, The EntityPrefetcher is actually a federated one which is DispatchingEntityPrefetcher but that doesn't distinguish between different prefetchers of entity types that exist in one federated repo. It's repo-based EntityPrefetcher. while if you set useEntitySourceBasedFederation, it uses MultipleEntitySourceServices to get the EntityPrefetcher (I still don't know how, otherwise I would have made the patch for it already) which that returns ByTypeDispatchingEntityPrefetcher which ignores entity types that don't have EntityPrefetcher defined so it lets the system flow naturally. I need to consolidate and find a better solution than DispatchingEntityPrefetcher but @WMDE-leszek knows way better than I do. Please take a look. TASK DETAIL https://phabricator.wikimedia.org/T223995 EMAIL PREFERENCES https://phabricator.wikimedia.org/settings/panel/emailpreferences/ To: Ladsgroup Cc: matej_suchanek, Ladsgroup, WMDE-leszek, hashar, hoo, Michael, E.S.A-Sheild, darthmon_wmde, Premeditated, alaa_wmde, joker88john, CucyNoiD, Nandana, NebulousIris, Mringgaard, Gaboe420, Versusxo, Majesticalreaper22, Giuliamocci, Adrian1985, Cpaulf30, Lahi, Gq86, Baloch007, Darkminds3113, Bsandipan, Lordiis, GoranSMilovanovic, Adik2382, Th3d3v1ls, Ramalepe, Liugev6, QZanden, LawExplorer, WSH1906, Lewizho99, Maathavan, _jensen, rosalieper, Jonas, Wikidata-bugs, aude, Lydia_Pintscher, Darkdadaah, Jdforrester-WMF, Mbch331, Jay8g, Krenair
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