pub fn shutdown<A: Allocate>(&mut self, worker: &mut Worker<A>) {
        self.inputs.sessions.clear();
        self.traces.inputs.clear();
        self.traces.arrangements.clear();

        // Deregister loggers, so that the logging dataflows can shut down.
        worker
            .log_register()
            .map(|mut log_register| log_register.insert::<TimelyEventBuilder,_>("timely", move |_time, _data| { }));

        worker
            .log_register()
            .map(|mut log_register| log_register.insert::<DifferentialEventBuilder,_>("differential/arrange", move |_time, _data| { }));
    }
Clear the managed inputs and traces.
interactive/src/manager.rs