Thanks Jens, Joshua, Sean, Jared; I'll surely give Couchbase a try (no offense).

CARP works for machines, not for services, right. I'll think on that aspect.

Again, any suggestion for a *storage backend* for our use case?

Quoting myself,

> We consider a NoSQL DB deployment for a mission-critical application where we 
> need to store several hundreds of millions of data records, each record 
> consisting of about 6 string fields, record total length is 160 bytes. There 
> is a unique key in each record that seems suitable for hashing (20+ bytes 
> string, e.g. "cle01_tpls01_2105328884").
>
> The application should be able to write several hundreds of new records per 
> second, but first check if the unique key already exists. Writing is to be 
> done only if it is not there. If it is, the app needs to retrieve the whole 
> record and return it to the client and no writing is done in this case.
>
> We need to have a cluster of at least 2-3 nodes, which must be able to grow 
> easily if a need be.

Thank you!

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