How to fix the “Found Netty’s native epoll transport in the classpath, but epoll is not available. Using NIO instead” warning?

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If you are running on Linux, you can use the native Linux driver. For instance, if you are using Maven, add a dependency like this:

<dependency>
  <groupId>io.netty</groupId>
  <artifactId>netty-transport-native-epoll</artifactId>
  <version>4.0.27.Final</version>
  <classifier>linux-x86_64</classifier>
</dependency>

An alternative, you can suppress the warning by setting
-Dcom.datastax.driver.FORCE_NIO=true. As it is only a performance optimization, it is a viable option to ignore it.

For more background, refer to the Netty documentation about native transports.

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