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?
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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).
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Shadowfax
Currently I see
reactor-http-nio-1 in the logs, I use SpringBoot 2.0.0 M6. How can I configure netty to use all cores?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.
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