Hi David,

The point of my post is that the "scalable and distributed system"
should be just one mode of operation of Google App Engine as it
ignores the other 50% use case which is admin and long-running
processes.

Those do _not_ have to scale.

But they are essential.

Aral

> I fail to see how either of these could be implemented in a truly
> scalable and distributed system such as App Engine. The data is
> potentially spread over thousands of machines, so any kind of global
> co-ordination (needed for both entity counts and transactions) would
> require a single machine to be "in charge", and hence the scaling
> would be limited to that machine's capacity.
<snip>
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