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I am doing a POC with Spring WebFlux on Tomcat. The stack is totally reactive and using Spring Reactor and Reactive Couchbase.

When I added load on the System, I saw that the number of threads in JVisualVM increased to 200+. Basically, reactor-http threads were limited, about 4 as expected.

But http-nio-exec threads jumped to around 200. If I run with Netty instead of Tomcat the the number of threads is limited about 30 only.

Can some one explain why Tomcat is spinning up so many threads with a Reactive Stack?

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Because netty has implemented an event loop mechanizm that alows for efficient handoff of incomming connections. Tomcat still uses model one thread per request.

This is a pretty intreting article on the issue:

https://kamilszymanski.github.io/resources-utilization-in-reactive-services/

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