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From Nitin Borwankar <>
Subject Re: Replication and new user questions
Date Wed, 26 Aug 2009 02:48:40 GMT
Miles Fidelman wrote:
> Blair Zajac wrote:
>> Hello,
>> We're looking at using CouchDB's replication to allow us to easily 
>> have multi-master replicating databases across multiple facilities, 
>> (e.g. Los Angeles, Albuquerque, Bristol, England, etc).  It looks 
>> like it'll be the perfect tool for the job.
>> Some questions on the current implementation and the work that I've 
>> read is going to be in forthcoming releases.
>> 1) What's the most robust automatic replication mechanism?  While 
>> continuous replication looks nice, I see there's some tickets open 
>> with it and that it has issues with four nodes.  Is a more robust 
>> solution, but a little slower and heavier, it to have an 
>> update_notification that manually POSTs to _replicate?
>> 2) With the persistent continuous replication feature, is there a way 
>> to stop continuous replication without restarting couchdb?  Will 
>> there be a way to manage the list of replicant databases when the 
>> persistent continuous replication feature is complete?
> I'm sort of interested in this too.  We have an application we're 
> developing that's somewhat analogous to USENET News.  What we want to 
> do is:
> 1. define arbitrary groups, analogous to newsgroups
> 2. distribute control messages to a large number of nodes, allowing a 
> node to subscribe (or not)
> 3. when a message (document) is posted (inserted) into a group, it 
> gets replicated to all subscribed nodes
> I keep looking at CouchDB and thinking this should be perfect for what 
> we're doing, but the details of replication are really sketchy.
> Miles Fidelman

That is interesting. I am working on a project with a subproject that 
has similar needs but for bibliographic information.
Will you be publishing the formats of the documents and control 
messages?  Aside from the project I have a strong interest in messaging 
over CouchDB networks.


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