Type:
Priority:
Resolution:
Fixed
Component/s:
None
There is relationship between LOCK_flush and LOCK_open. Even though it is not on a hot path, it indirectly interferes with TABLE_SHARE::tdc.flushed. The latter is on hot path and will eventually be moved out of LOCK_open.
The sole purpose of LOCK_flush is to let tdc_remove_table() wait for concurrent FLUSH TABLES. Replace global rwlock with per-share condition variable.
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Task
Major
MDEV-5864 Reduce usage of LOCK_open: TABLE_SHARE::tdc.free_tables