Who can elaborate on the semi consistent read under mysqlrc and how to reduce the deadlock probability?

Used by the company mysql The database level is RC, I always thought it was RR, Later, I checked the reason and said that the default isolation level was changed to... Based on concurrency and reducing the probability of deadlock RC, Improve concurrency I can understand , But who can explain how to reduce the probability of deadlock ？ It's better to elaborate Rc Semi consistent reading of