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We will default to MUTEXTYPE=sys (using OSTrackMutex) for those ib_mutex_t that have not been replaced yet. The view INFORMATION_SCHEMA.INNODB_SYS_SEMAPHORE_WAITS is removed. The parameter innodb_sync_array_size is removed. FIXME: innodb_fatal_semaphore_wait_threshold will no longer be enforced. We should enforce it for lock_sys.mutex and dict_sys.mutex somehow! innodb_sync_debug=ON might still cover ib_mutex_t.