flink uses akka for control plane kind of stuff. data plane stuff, like piping data between tasks, doesn't. check out https://flink.apache.org/2019/06/05/flink

flink uses akka for control plane kind of stuff. data plane stuff, like piping data between tasks, doesn't. check out https://flink.apache.org/2019/06/05/flink-network-stack.html https://flink.apache.org/2019/06/05/flink-network-stack.html for some (maybe outdated) details.