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Myrocks range locking#1449
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- Add new sysvar, rocksdb_use_range_locking. When it's on: - RocksDB is initialized to used range-locking lock manager - For all DML operations (including SELECT ... FOR UPDATE), the scanned range will be locked before reading/modifying rows - For all DML operations, MyRocks will read and modify the latest committed data, just like InnoDB does, because there is no snapshot checking if range locking is used. - Introduce a RocksDB locking iterator, which reads the rows, locks the range, - and re-reads the rows. It is used for queries that do not have a finite range to scan, like UPDATE t1 ... ORDER BY t1.key LIMIT n - Add another new sysvar, rocksdb_use_range_lock_manager_as_point, which uses the point locking algorithm but the lock manager used is the range one. - Add enabled rocksdb_use_range_locking as another MTR rocksdb suite test combination. Co-authored-by: Sergei Petrunia <sergey@mariadb.com> Co-authored-by: Laurynas Biveinis <laurynas.biveinis@gmail.com>
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