Is there a way to replicate certain part of collection in Mongodb Is there away to stream certain part of collection in MongoDB or TokuMX from master server to another server? I need to duplicate only certain collection

Or if it isn't possible, are there any other alternative for database that doesn't enforce schema?
MongoDB at least to current version 2.6+ for sure does not support that as build-in functionality. I guess because a replica set using selective replication won't be consistent.

There is a feature called filtered replication in Couch but never tried it:
http://wiki.apache.org/couchdb/Replication#Filtered_Replication