You have to be very careful when debugging things in a concurrent environment, at least when you debug in a more traditional way which stops and controls execution. Anything that is waiting for the debugged process will hang and in many cases may time out and crash, which is not what was intended. Also doing something like IEx.pry in a function which is called in many processes will also be interesting.
Sorry to sound very negative here but having very concurrent systems does change you need to work with them. Sometimes IO.inspect is all that is reasonable. Or use the built-in tracing facilities.
Robert
