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This is a list of known issues and problems with couchdb - that may enlighten or clarify a bit which features are not 100% yet.
This list is mainly targeted the would-be couchdb users that are researching and planning. Also - this list is probably not complete.
CouchDB 1.0.2
Replication across WAN is unstable when dealing with larger datasets and will fail hard at some point (https://issues.apache.org/jira/browse/COUCHDB-690)
Replication is NOT persistent. When you restart your couchdb server - you'll need to resend the replication setup. (Fixed in 1.1 through _replicator db, see COUCHDB-776)