> The singleton concept means that all replicas must be in 
> synch to have the same state.  

Wow! I think there no place that state that. +1 for being ultra-KISS in
these directions.

In the case of EJB its easy for the container (and containers) to keep a
track while they relies on databases. A container may keep an Entity EJB in
Cache and use a timestamp to keep track of external modification, and then
invalidating the cache.

OTOH headless cluster are a such a big monster! And it leads me to ask: is
it worth going in this direction? I'll keep my JINI adapter to Merlin flag
up ;-) (but JINI codes are too ugly!!!)


cheers,
hammett

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