private void replyWithAck(int taskId)
        {
            var ack = new TaskReceivedAckMessage()
            {
                TaskId = taskId
            };

            MasterActor.Tell(ack);
        }
        public void Handle(TaskReceivedAckMessage message)
        {
            List <Task> sentTasks;

            if (validSSWithSentReduceResults.TryGetValue(Sender, out sentTasks))
            {
                sentTasks.RemoveAll(task => {
                    Console.WriteLine("SS Ack for end task: " + task.Id);
                    return(task.Id == message.TaskId);
                });
            }
        }