Here is an idea for better datastore fault tolerance:

Why not have >1 datastore available to each application.  When Google
needs to do maintenance, they put at most 1 datastore in read-only
mode, and applications can revert to 1 or more alternate datastores
until the maintenance is completed, then apps can use their task queue
to resync their own data.

A person can accomplish this right now using AWS SDB when BigTable
becomes unavailable, but sending that data over the internet is not
ideal.

One of the big selling points of GAE is scalability, fault tolerance,
and uptime, but having no persistent write access for any period of
time prevents people from achieving those ideals.

Are temp/failover datastores a plausible idea?

Thanks,

Robin
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