> - The current option of low-latency, strong consistency, and lower
> availability during unexpected failures (like a power outage)
>
> - A new option for higher availability using synchronous replication
> for reads and writes, at the cost of significantly higher latency

This would be fantastic, if one were able to select between the two
configurations in the same App. That would make it possible for one to
have a "regular" and a "failsafe" version of a database, where the
failsafe version is updated less frequently. This makes sense for a
number of my apps in which it is helpful to give users access to some
basic data even if the system is basically "down."

Thanks also for the nice postmortem. So far, one of the best things
about using App Engine has been the openness with which information is
provided to users.

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