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

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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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