Is there a sweet spot for choosing the number of coordinator and shuffle service?

[hongkunyoo]

I'm a newbie of Uniffle. My question might be trivial to others who are already familiar with it.
However I want to get some help and advice.

I have following questions that I want to know:

1. Is it OK to have different coordinator quorum number per clients?

Let's say client A has 2 quorum, client B has 3 quorum.
The reason I'm asking this is because I'm wondering if it's possible to change the quorum number after some users are already using with previous quorum number.

2. Is there some kind of sweet spot to choose the optimal number of quorum and shuffle server?

Is there an upper asymptote bound of number of quorum? For example, more than 4 or 5 quorum has no difference with 3?

3. How can I find one by myself if it depends on the load.

What kind of metrics or logs do I need to look for to get my optimal settings?

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Please guide me if there is a good way to find the answer.

[jerqi]

Client can use different quorums.It's hard to find suitable quorum number. Usually we choose 1 or 3 quorum number. For important jobs, we can choose 3 quorum. For normal jobs, we can choose 1 quorum.

[hongkunyoo]

Thanks for prompt response. It helped a lot!