Coherence is kind of an ACID Cache. It can use partioned+redundant
topologies and it seems you can scale it just by adding more servers
into new partitions. (It also seems you can do this without stopping
it.)

It also seems you can use it as storage.

Take a look at this:
http://www.theserverside.com/news/thread.tss?thread_id=39186

There is a story often repeated about one of the data centers of a
customer being destroyed and no data being lost to give some color to
it too.


These guys are good. Very good. But Coherence still works live a very
big and expensive hash table.

I like the idea of having SQL on top of their scaling ability, or
something to the same effect.


have fun,
Paulo Gaspar

On 2008-06-19, at 22:52, paulruizendaal wrote:

> Hi Paolo, David,
>
> Thank you for your input. I knew neither ObjectGrid nor Coherence (I'm
> not a java man). It sounds like both indeed are part of the way to the
> goal that we are trying to reach. It confirms my opinion we are not
> being radically creative, just continuing trends, pushing the envelope
> just a bit further. That is just an observation, not a judgement.
>
> Would either of you have some insight as to the internal architecture
> of these systems, and observations that we might learn from? Perhaps
> some experience with their scalability or pro's and con's in real life
> use?
>
> Paul
>
>
>
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