How to increase the configuration information of option file and Cmd-line in MySQL

Adding variables to save configuration information in mysqld.cc
Such as:
ULONG Opt_mts_slave_parallel_workers;

Increase the definition of the variable in mysqld.h
Such as:
extern ulong Opt_mts_slave_parallel_workers;

Declare a variable in MySQL in sys_vars.cc, and the variable will read the corresponding parameter
Such as:
Static Sys_var_ulong Sys_slave_parallel_workers (
"Slave_parallel_workers",
"Number of worker threads for executing events in parallel",
Global_var (Opt_mts_slave_parallel_workers), Cmd_line (Required_arg),
Valid_range (0, Mts_max_workers), DEFAULT (0), block_size (1));

and use it where you want to use it.

How to increase the configuration information of option file and Cmd-line in MySQL