Does anyone know a good, low overhead out-of-process message queue, that's lightweight enough that it can be useful for communicating between processes on the same machine, but if necessary it can scale beyond it? In case of a single-machine product that comprises of several services, a message queue can sometimes be useful for pull model, but adding RabbitMQ to the stack makes installation and ops much more complex than customers deem acceptable.
I know some people use Akka with Persistence module, but I would welcome other alternatives.
I know some people use Akka with Persistence module, but I would welcome other alternatives.