Why do we really need multiple netty boss threads?

Question

I\'m really confused about the number of threads for a boss group. I can\'t figure out a scenario where we need more than one boss thread. In do we need more than a single threa

Answer 1

the creator of Netty says multiple boss threads are useful if we share NioEventLoopGroup between different server bootstraps, but I don't see the reason for it.

As Norman Maurer said, it's not necessary, but it's very useful.

If you are using 1 thread for 2 different bootstraps, it means that you can't handle connections to this bootstraps simultaneously. So in very very bad case, when boss thread handle only connections for one bootstrap, connections to another will never be handled.

Same for workers EventLoopGroup.