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An expressive Clojure client for Riak with batteries included
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Welle, a Clojure client for Riak

Welle is a young idiomatic Clojure client for Riak built on top of the Riak Java driver. Its API and code style closely follow other ClojureWerkz Clojure libraries, namely Neocons, Elastisch and Monger.

Welle is not the only Clojure client for Riak on the block: there is a client called Sumo by one of Basho's engineers. If you are evaluating Welle, please consider Sumo as well.

Project Goals

  • Be well maintained
  • Be well documented
  • Be well tested
  • Target Clojure 1.3.0 and later from the ground up
  • Batteries included: clojure.core.cache implementation on top of Riak and so on
  • Be friendly to Heroku and other PaaS providers

Supported Features

  • Protocol Buffers and HTTP connection
  • Buckets: create, update, delete
  • Objects: put, fetch, delete
  • Secondary indexes (2i): indexing, index queries
  • Content-type based serialization of values in common formats (bytes, JSON, Clojure data/reader, UTF-8 text, gzipped JSON)
  • clojure.core.cache implementation on top of Riak

In addition Welle has maturing (but still very primitive, so not listed above) map/reduce query support.

Supported Clojure versions

Welle is built from the ground up for Clojure 1.3 and up. To store dates/instants with Clojure data serialization, Clojure 1.4.0 is the minimum required version because Clojure 1.3 reader cannot handle java.util.Date instances. As such, Clojure 1.4 is recommended.

Getting Started

Please refer to our Getting Started with Clojure and Riak guide.


To subscribe for announcements of releases, important changes and so on, please follow @ClojureWerkz on Twitter.

Maven Artifacts

Most Recent Release

With Leiningen:

[com.novemberain/welle "1.0.0-alpha5"]

With Maven:


Documentation & Examples

Welle is a young project and documentation guide are not fully written yet. Documentation is one of the top priorities for the project and we are improving things week after week.

For code examples, see our test suite.

Continuous Integration

Continuous Integration status

CI is hosted by


Welle uses Leiningen 2. Make sure you have it installed and then run tests against all supported Clojure versions using

lein2 ci test

Then create a branch and make your changes on it. Once you are done with your changes and all tests pass, submit a pull request on Github.


Copyright (C) 2011-2012 Michael S. Klishin

Distributed under the Eclipse Public License, the same as Clojure.

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