> On Apr 30, 2015, at 8:59 AM, Daniel McGreal <[email protected]> wrote:
> 
> Could you elaborate a little on how this would be achieved (links to 
> documentation/terminology to search for appreciated also).

CouchDB is at http://couchdb.apache.org <http://couchdb.apache.org/>. It's the 
architectural ancestor of CBL and SG — they're implemented differently and the 
feature sets have diverged, but the core of the document model and replication 
protocol come from CouchDB, and all three will replicate with each other.

The CouchDB replicator can be pointed to two external databases and will 
replicate from one to the other. So you could for example POST to /_replicate 
with a JSON body like
        {"source": "http://europe.example.com/db 
<http://europe.example.com/db>", "target": "http://asia.example.com/db 
<http://asia.example.com/db>", "continuous":true}
and it would replicate from the source SG database to the target. (Then you'd 
create a second replication going the other way, probably.)

For deployment you'd probably want to use persistent replications, which are 
described in the CouchDB docs. The setup is slightly different.

—Jens

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