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From Garren Smith <>
Subject Re: Scheduling Replicator
Date Mon, 24 Apr 2017 07:10:26 GMT
This is really exciting. From a Fauxton perspective, we already support the
new replication api. Once this lands in CouchDB, you will get more
information about your replications in the replication section. There is
also a new _replicate tab, that will show the user any active _replicate
replications that are happening.


On Fri, Apr 7, 2017 at 3:37 PM, Nick Vatamaniuc <> wrote:

> Dear CouchDB Community,
> Replication is one of the central components of CouchDB. It’s what makes
> our
> database unique and gives it properties few others have, such as
> master-to-master replication, offline-first capability, ability to set
> up custom
> replication topologies to suit various user cases.
> Over at IBM Cloudant we found our users often push CouchDB’s replication to
> its limits, and in some circumstances it struggles with stability,
> performance and operability. Last year we identified a few areas which were
> more pressing and set out to see if we could improve them:
> Some of the issues are summarized here
> The top two ones were:
> 1) Allow running a larger number of replication jobs without crashing or
> affecting the rest of the system.
> 2) Do not write transient replication states back to replication documents.
> This consumes disk IO and causes operational issues. Instead provide a
> status monitoring API specific for replications.
> We believe we accomplished those two goals, and improved on other areas as
> well. Today we’d like to share that work with the rest of the community. We
> are proposing these two PRs:
> : This is the main one to
> update
> the replicator application. The PR description includes a detailed list of
> improvement and a nifty graph showing how the new scheduling replicator
> behaves in the presence of a large number of jobs.
> : Documentation
> PR
> to describe the new behavior.  Thanks to a recent initiative from Joan
> Touzet, building our docs is now fast and easy. There is a state transition
> diagram there which describes all the possible replication jobs states.
> Thanks to Garren Smith and other members of the Dashboard Team, Fauxton
> support for the new replicator has already been merged in.
> Also many thanks to other team members who helped us: Paul Davis for
> helping with design and architecture, Rob Frazier and Gino Cubeddu for
> their testing and validation work.
> We'd like to request approval to integrate these changes into the ASF
> CouchDB project. Please test, review, and provide comments and feedback.
> Sincerely,
> IBM Cloudant Engineering (Robert Newson, Benjamin Bastian, Nick Vatamaniuc)

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