Reply To: Site Updates and Feature Requests
Not overly clearly “why”, but the recent routine update to the MariaDB Galera cluster stopped page editing from working due to a single “GET_LOCK” in the MediaWiki code (oddly, this wasn’t an issue with the previous MariaDB releases). As a quick fix, /includes/libs/rdbms/database/DatabaseMysqlBase.php has been tweaked with the suggestions on this page:
lockIsFree (to return true), lock (to return false) and unlock (to return false)
(n.b. the use of GET_LOCK appears to have been removed from MediaWiki 1.39, so this should be fully resolved by the upcoming upgrade)