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That was actually one of the explicit design goals of Rethink -- pick defaults such that users never have to wonder about the safety of their data. I know the folks at Riak are also in this camp, so there are definitely NoSQL dbs that do this well.

I'm not sure Riak is a good example as it's another example of an extremely slow database.

There's also the angle that if it's to offer no performance benefit, perhaps a classic relational database will do it?

I'm curious to hear your thoughts about it.

As someone that uses hbase in production, I'd be interested in hearing the setting you are talking about.

Honestly, I've been very positively impressed with CouchDB so far.