Hi *,
recently and while browsing code and investigating how the ask pattern for
actors is implemented, the question "Is it reasonable and possible to
execute futures on actors on distributed nodes of an Akka cluster" came to
my mind. Expressed differently: Can we automatically distribute work,
futures do, across an Akka cluster.
Is there already a solution, which I have overseen?
*Suggestions: Steps to execute a future on an remote node*
1. create a promise locally
2. create one local actor (caller)
3. create one new remote actor on any of the cluster nodes (callee), via
round robin, etc.
4. send message to callee actor to start computation
5. ... actor comes eventually to execution ...
6. on completion of the computation, callee sends back
- ether a success message (containing the result of the future
computation) or
- a failure message (containg the Exception) to the caller
7. on receive of either success or failure message, the caller puts
the result into the promise
Does this approach seem valid?
Within step 3 the "automatism" comes into play. Questions to be answered:
Where is the remote actor created? Which strategy does one choose?
Nevertheless, the user should not be bothered with these details. Instead,
the user should just configure which remote nodes form the cluster and are
available to execute work.
*Where to start ?*
On the one hand, a future comes to execution (wrapped as Runnable) via the
execute method of an ExecutionContext. If one sets a different (implicit)
ExecutionContext, this behavior can be changed.
On the other hand the implementation in scala.concurrent.impl.Future and
scala.concurrent.impl.Future.PromiseCompletingRunnable could allow a
different approach.
What is a reasonable starting point?
Looking forward to hearing your comments and ideas,
Martin
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