Default number of threads in Spring boot 2.0 reactive webflux configuration

问题

While using Spring 5 reactive webflux with Spring boot 2.0, what's the default number of threads used to handle requests? How can I configure the number of threads used?

回答1:

The default number of threads for request handling is determined by the underlying web server; by default, Spring Boot 2.0 is using Reactor Netty, which is using Netty's defaults (check out the EventLoopGroup documentation for that).

Spring Boot will soon allow you to customize that part (see #10418). In the meantime, you can provide your own ReactiveWebServerFactory bean and change that through the HttpServer configuration options (see this comment).

回答2:

Currently, it seems that Spring Webflux 2.0 does not provide the ability to control threads.

Spring Webflux 2.0 is using Reactor-Netty. And ReactorNettyclass provides some configurations.

• reactor.netty.ioWorkerCount
• reactor.netty.ioSelectCount
• reactor.netty.pool.maxConnections
• etc

So, You can use it like this.

System.setProperty("reactor.netty.ioWorkerCount", "100");

I hope that Spring Boot will provide a custom configuration.

来源：https://stackoverflow.com/questions/46925508/default-number-of-threads-in-spring-boot-2-0-reactive-webflux-configuration