Please keep in mind that Scala's "Actor Model" is a very thin piece of code
that is not inherently distributed.

There are a ton of issues in Scala related to crossing address spaces.

Scala is not nearly as biased to immutability as Clojure. Sure, there are
case classes, but case classes can easily contain mutable data. When I
wrote Goat Rodeo (http://goatrodeo.org), I wrote a compiler plugin that
guaranteed immutability and serializability of the data structures used for
Goat Rodeo's Actor-based messaging... and this lead to the second issue...

Having a class-based design means that one has to deal with
serializing/deserializing class-based data structures. This is a huge
problem. It means that the inter-process data structures must contain class
signatures... and for distributed systems that are going to have 100%
uptime, that means version and class signatures so that a message sent from
a version 1 system can be deserialized on a version 2 system even if the
class has changed.

Long story short... Akka, the only popular distributed system in Scala, is
marginally better than RMI/J/EE, so for enterprise java shops, it's great
(much like Spring was.) But it's not something to aspire to.

If I get some time, I'll work on a distributed version of core.async. The
only real challenge I can see is marshalling a Channel identifier across
address spaces. Everything else should be a walk in the park.






On Wed, Jul 3, 2013 at 5:26 PM, Hussein B. <hubaghd...@gmail.com> wrote:

> Hi,
>
> I read recently on the internet that Clojure concurrency tools make it
> easy to implement a highly concurrent system but on a single machine.
>
> But how to implement a highly concurrent system that runs on a multiple
> machines?
>
> Erlang, Elixir and Scala have the Actors model.
>
> Please correct me if I'm wrong.
>
> Thanks for help and time.
>
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