Configuring num.io.threads, num.replica.fetchers and num.network.threads depending on the number of CPU cores

[Alex D]

Hello everyone,

Are there any best practices to configure num.io.threads, num.replica.fetchers and num.network.threads depending on the number of CPU cores?

I've seen some configuring them using this formula:

num.io.threads(=CPU cores * 8/(3+8+1)) + num.replica.fetchers(=CPU cores * 1/(3+8+1)) + num.network.threads(=CPU cores * 3/(3+8+1)) = CPU cores

 

Example:

 CPU cores = 56

 num.io.threads(=56 * 8/(3+8+1)) + num.replica.fetchers(=56 * 1/(3+8+1)) + num.network.threads(=56 * 3/(3+8+1)) = 56

 where

   num.io.threads = 56 * 8/(3+8+1) = 37

   num.replica.fetchers=56 * 1/(3+8+1) = 5

   num.network.threads=56 * 3/(3+8+1) = 14