Nader,
Background: ----------------------------------------------------- It is a common practice to scale up by running several instances of a container system, e.g. Merlin, on multiprocessor machines and on several computers. This would require communication among container systems running in different JVMs. There exist many different techniques: simple Round Robin external routing, shared memory systems like JavaSpaces, persistant shared memory systems involving RDBM and finally mobile codes (as in mobile agents). ----------------------------------------------------
Basically we're talking about "clustering" components and/or component failover. Things like the stateful or the stateless nature of components might need to be considered and state propagation must be handled in the stateful case. Component affinity must also be considered. There are several factors I could go on ad infinitum. Some will think it is impossible to achieve component clustering due to the perceived need to consider the nature of each component. I don't think this is the case. If a good clustering framework can be devised then yeah sure I think components can be clustered. Perhaps this can be a facility of the container - just thinking out loud.
I'm definitely on board with a something to enable clustering of merlin-hosted applications. It was a question that I was asked alot at my old company if merlin supported it.
It's a requirement IMO if we anticipate Merlin to have any real uptake and impact in the enterprise.
Feel free to pick up this torch and run with an attempt to "cluster" components within multiple containers within multiple JVMs. It takes a brave soul but I have a feeling that you may be the right guy for it.
Wanted: Brave Souls. :)
I'm not a *clustering* expert by any stretch of the imagination, but I'll throw my name in the pot as a foot soldier willing to learn and do.
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