mysql 5.7 replication - slave_parallel_workers and slave_pending_jobs_size_max

[devops berlin]

I am using `slave_parallel_type = LOGICAL_CLOCK` and `slave_parallel_workers = 20` to achieve replication performance.

Lets say I am using `m4.4xlarge` with 16 cores and 64GB memory for the master and the slave:

1. As far I understand these`slave_parallel_type` and `slave_parallel_workers` parameter should be only on the slave, right ?

2. What value `slave_parallel_workers` parameter should have? 16 as number of cores ? (I test it with 20 and I got nice performance).

3. Any suggestion about the slave_pending_jobs_size_max ?

4. sync_binlog=1 should be on both master and slave to increase group commits and increase the potential to execute queries in parallel?


> slave_parallel_workers=20
> slave_parallel_type = LOGICAL_CLOCK
> slave_pending_jobs_size_max=1G
> sync_binlog=1
> max_allowed_packet = 256M

Thanks