In MDEV-16264, the InnoDB subsystem that purges committed transaction history was converted to use a common thread pool. However, some remains of the purge specific thread queue srv_sys was not removed, and neither was purge_sys.query. The data structures are unnecessarily complex and could hurt some performance while also making the logic harder to follow. This last came up during the code review of MDEV-34515.
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Bug
Major
MDEV-16264 Implement a common work queue for InnoDB background tasks
