Lucas_Werkmeister_WMDE added a comment.
Apparently prior to MySQL 5.7 / MariaDB 10.0.2, a connection can only hold one lock at a time, and a `GET_LOCK()` call will release the previous lock. MediaWiki core currently claims to support MySQL 5.5.8+, so I guess if someone runs Wikibase on an old MySQL version, the changes we make here won’t fully protect them from duplicate items (though they should still work for single sitelinks). We can probably live with that, though. (In production, we run a sufficiently new MariaDB version: 10.4.15, according to Special:Version.) TASK DETAIL https://phabricator.wikimedia.org/T291377 EMAIL PREFERENCES https://phabricator.wikimedia.org/settings/panel/emailpreferences/ To: Lucas_Werkmeister_WMDE Cc: Aklapper, hoo, Lea_Lacroix_WMDE, Mohammed_Sadat_WMDE, Lydia_Pintscher, Addshore, Lucas_Werkmeister_WMDE, Invadibot, maantietaja, Akuckartz, Iflorez, alaa_wmde, Nandana, lucamauri, Lahi, Gq86, GoranSMilovanovic, QZanden, LawExplorer, _jensen, rosalieper, Scott_WUaS, Wikidata-bugs, aude, Mbch331
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