When load testing with Ktor with Netty as engine I...

# ktor

[Albert]

When load testing with Ktor with Netty as engine I get the following message:

[nettyCallPool-4-20] WARN io.netty.channel.nio.NioEventLoop - Selector.select() returned prematurely 512 times in a row; rebuilding Selector io.netty.channel.nio.SelectedSelectionKeySetSelector@61246795.

What does this exactly mean? I use the following for testing:

ab -k -n 100000 -c 500 <http://localhost:8080/test>