[speedgoose]

Does MongoDB have multi master replication or the classic election of one master from a pool of candidates ?

CouchDB has another pattern, each master is really a master and you can have live replication but also offline replication. You can connect two clusters every new moon and they will synchronize. For sure the clients may have to deal with potential conflicts but in practice it's very neat and that's what makes couchdb worth it if you need this feature.

[Graphguy]

MongoDB does replica sets and sharding. As far as I know it doesn't support multi-master architectures or data syncing. Even the Atlas-style global data distribution is sharding, right?