How to improve performance of MySQL group replication?

Question

In MySQL 5.7, there is a new feature called Group replication used for fault tolerant system.

Group Replication Doc

I implemented the group replication with 1 master and 3 slaves and it working fine. But i feel it little slow. Slow means query taking time in execution on master. It may be because of master waits for acknowledgement from slave or time in certification acceptance etc.

I know it may be broad question but if you guide some parameters related to group replication to improve the performance then it will be helpful.

Thanks

Answer 1

As you say, the Master does have to communicate with its Slave(s). So, yes, that does slow down each transaction .

Each COMMIT is delayed by the coordination among the servers. So, two things might be possible in your app:

• Fewer COMMITs ; that is more statements in each transaction. (But not too many.)
• More parallelism at the client, hence more transactions running in parallel.