Merging rcouch

rcouch is a variant of CouchDB that is derived from the main Apache CouchDB code base. One way to look at it is as a “future port” of CouchDB, that is for two reasons:

  1. The internals are greatly improved. In simple terms, if CouchDB would be started to day, it would look a lot like rcouch.
  2. It comes with a number of nice new features.

So whether you are a CouchDB user or a CouchDB Erlang developer, rcouch is good news for you!

Since CouchDB has been around for a while, the internal codebase is a little crufty. We are constantly working on improving that, but one of the larger efforts have been done within the rcouch project by Apache CouchDB committer Benoit Chesneau.

At the same time, Benoit added a number of nice little features that benefit CouchDB users, just to name a few:

  • _changes for views.
  • Replication from views.
  • Write-only “Drop-Box” databases.
  • Request validation on-read.
  • _db_changes (actually, we nicked that one for Apache CouchDB 1.4 already :).

For more information, see the rcouch website.

Benoit has generously donated the rcouch project back to Apache CouchDB and has worked on merging the rcouch and the CouchDB codebases. Now it is time to review the merged code and get it into Apache CouchDB proper and put it into a new release.

With that, we need your help.

How you can help, you ask? Easy!

If you are a CouchDB user, and are not afraid to build CouchDB yourself, give the rcouch merge branch a spin:

git clone
cd couchdb
git checkout -b 1994-merge-rcouch origin/1994-merge-rcouch

# Read the DEVELOPERS file to install all dependencies

# test regular build:

# test build with static icu library
make icu=static

# test build with shared libraries
make libs=shared

# run test suite
make check

# make a release
make rel

# run:
./rel/apache-couchdb/bin/couchdb start

# now CouchDB is running at, as usual, you just won’t see any output.

If you are an Erlang developer, we could use your help with code reviews. Any small chunks will help!

Please see the associated JIRA ticket for more information.

Thanks so much!

FaQ: how does this relate to BigCouch?

It doesn’t really, the BigCouch merge is ongoing and we will announce updates and requests for review when the time is right. Well, actually, if we can convince you to help with the review of the rcouch merge, we can put even more resources on the BigCouch merge 🙂

CouchDB Weekly News, April 10


Apache CouchDB 1.5.1 released

This is a security release. Download link | Release notes

Blog Posts

Major Discussions

Writing many docs at once: bench marking a 10k write to a CouchDB server (see thread here)

A discussion around handling and measurements of bulk input in CouchDB.

Question about “complex” range queries (see thread here)

Requirements for sort orders of data views.

Is the revision field deterministic? (see thread here)

Quoting Robert Samuel Newson’s reply: “Yes, it’s deterministic. The same document with the same history will have the same _rev value. This is an optimization over the previous algorithm where _rev was a random UUID. […] The advantage is that two servers receiving the same update can more optimally replicate. They still have to check that the target has all _id/_rev pairs but will usually be able to skip actually transmitting document and attachment content.”

CouchDB Universe

  • Apache Con has taken place from April 7-9. You can find the slides of the talks given here

Releases in the CouchDB Universe

  • New Erlang Version is out
  • mbtiles2couchdb, for using CouchDB as a simple tiles server
  • RCouch has a new home: announcement | the new home
  • PPnet, a minimal social network to drop into websites based on PouchDB
  • sabisu, a sensu web UI, got open sourced by Cloudant last week
  • Janus, an online storage for offline Web Apps built using PouchDB
  • couche 0.0.2, a couchdb client for node, with specific apis
  • mock-couch, an http server pretending to be couchdb, for unit testing
  • couchdb-sync 0.1.1 – a generic couchdb replicator which is basically an eventemitter
  • hackoregon-couch 0.0.2 which exports database information from PostgreSQL and imports into CouchDB
  • overwatch 0.2.7, a deterministic couchdb replication watcher


Use Cases, Questions and Answers

Get Involved!

If you want to get into working on CouchDB:

  • here’s a list of beginner tickets around our currently ongoing Fauxton-implementation. If you have any questions or need help, don’t hesitate to contact us in the couchdb-dev IRC room (#couchdb-dev) – Garren (garren) and Sue (deathbear) are happy to help.
  • Your help on updating CouchDB-Python for Python 3. Wanna join? Please participate here.

We’d be happy to have you!

New PMC Member

  • Joan Touzet joins the Apache CouchDB Project Management Committee today. Joan has made outstanding, sustained contributions to the project. Welcome to the Couch, Joan!


Job opportunities

… and also in the news

Posted on behalf of Lena Reinhard.