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+As I was looking for a system to store documents at <a href="http://linkfluence.net">$work</a>, <a href="http://www.basho.com/Riak.html">Riak</a> was pointed to me by one of my coworkers. I'm looking for a solution of this type to store various types of documents, from HTML pages to json. I need a system that is distributed, faul tolerant, and that works with Perl.
+
+So Riak is a document based database, it's key value, no sql, REST, and in Erlang. You can read more about it <a href="http://riak.basho.com/nyc-nosql/">here</a> or watch an introduction <a href="http://vimeo.com/6973519">here</a>. Like <ahref="http://couchdb.apache.org/">CouchDB</a>, Riak provides a REST interface, so you don't have to write any Erlang code.
+
+One of the nice things with Riak it's that it let you defined the N, R and W value for each operation. This values are:
+
+* N: the number of replicas of each value to store
+* R: the number of replicas required to perform a read operation
+* W: the number of replicas needed for a write operation
+
+Riak comes with library for python ruby PHP and even javascript, but not for Perl. As all these libraries are just communicating with Riak via the REST interface, I've <a href="http://git.lumberjaph.net/p5-anyevent-riak.git/">started to write one</a> using AnyEvent::HTTP, and <a href="http://git.lumberjaph.net/p5-kiokudb-backend-riak.git/">also a backend for KiokuDB</a>.
+
+## Installing and using Riak
+
+If you interested in Riak, you can install it easily. First, you will need the Erlang VM. On debian, a simple
+
+```bash
+% sudo aptitude install erlang
+```
+
+install everything you need. Next step is to install Riak:
+
+```bash
+% wget http://hg.basho.com/riak/get/riak-0.6.2.tar.gz
+% tar xzf riak-0.6.2.tar.gz
+% cd riak
+% make
+% export RIAK=`pwd`
+```
+
+Now, you can start to use it with
+
+```bash
+% ./start-fresh config/riak-demo.erlenv
+```
+
+or if you want to test it in cluster mode, you can write a configuration like this:
+
+```erlang
+    {cluster_name, "default"}.
+    {ring_state_dir, "priv/ringstate"}.
+    {ring_creation_size, 16}.
+    {gossip_interval, 60000}.
+    {storage_backend, riak_fs_backend}.
+    {riak_fs_backend_root, "/opt/data/riak/"}.
+    {riak_cookie, riak_demo_cookie}.
+    {riak_heart_command, "(cd $RIAK; ./start-restart.sh $RIAK/config/riak-demo.erlenv)"}.
+    {riak_nodename, riakdemo}.
+    {riak_hostname, "192.168.0.11"}.
+    {riak_web_ip, "192.168.0.11"}.
+    {riak_web_port, 8098}.
+    {jiak_name, "jiak"}.
+    {riak_web_logdir, "/tmp/riak_log"}.
+```
+
+Copy this config on a second server, edit it to replace the riak\_hostname and riak\_nodename. On the first server, start it like show previously, then on the second, with
+
+```bash
+% ./start-join.sh config/riak-demo.erlenv 192.168.0.11
+```
+
+where the IP address it the address of the first node in your cluster.
+
+Let's check if everything works:
+
+```bash
+% curl -X PUT -H "Content-type: application/json" \
+    http://192.168.0.11:8098/jiak/blog/lumberjaph/ \
+    -d "{\"bucket\":\"blog\",\"key\":\"lumberjaph\",\"object\":{\"title\":\"I'm a lumberjaph, and I'm ok\"},\"links\":[]}"
+
+% curl -i http://192.168.0.11:8098/jiak/blog/lumberjaph/
+```
+
+will output (with the HTTP blabla)
+
+```javascript
+    {"object":{"title":"I'm a lumberjaph, and I'm ok"},"vclock":"a85hYGBgzGDKBVIsbGubKzKYEhnzWBlCTs08wpcFAA==","lastmod":"Sun, 13 Dec 2009 20:28:04 GMT","vtag":"5YSzQ7sEdI3lABkEUFcgXy","bucket":"blog","key":"lumberjaph","links":[]}
+```
+
+## Using Riak with Perl and KiokuDB
+
+I need to store various things in Riak: html pages, json data, and objects using KiokuDB. I've started to write a client for Riak with AnyEvent, so I can do simple operations at the moment, (listing information about a bucket, defining a new bucket with a specific schema, storing, retriving and deleting documents). To create a client, you need to
+
+```perl
+my $client = AnyEvent::Riak->new(
+    host => 'http://127.0.0.1:8098',
+    path => 'jiak',
+);
+```
+
+As Riak exposes to you it's N, R, and W value, you can also set them in creation the client:
+
+```perl
+my $client = AnyEvent::Riak->new(
+    host => 'http://127.0.0.1:8098',
+    path => 'jiak',
+    r    => 2,
+    w    => 2,
+    dw   => 2,
+);
+```
+
+where:
+
+* the W and DW values define that the request returns as soon as at least W nodes have received the request, and at least DW nodes have stored it in their storage backend.
+* with the R value, the request returns as soon as R nodes have responded with a value or an error. You can also set this values when calling fetch, store and delete. By default, the value is set to 2.
+
+So, if you wan to store a value, retrieve it, then delete it, you can do:
+
+```perl
+my $store =
+    $client->store({bucket => 'foo', key => 'bar', object => {baz => 1},})
+    ->recv;
+my $fetch = $client->fetch('foo', 'bar')->recv;
+my $delete = $client->delete('foo', 'bar')->recv;
+```
+
+If there is an error, the croak method from AnyEvent is used, so you may prefer to do this:
+
+```perl
+use Try::Tiny;
+try {
+    my $fetch = $client->fetch('foo', 'baz')->recv;
+}
+catch {
+    my $err = decode_json $_;
+    say "error: code => " . $err->[0] . " reason => " . $err->[1];
+};
+```
+
+The error contains an array, with the first value the HTTP code, and the second value the reason of the error given by Riak.
+
+At the moment, the KiokuDB backend is not complete, but if you want to start to play with is, all you need to do is:
+
+```perl
+my $dir = KiokuDB->new(
+    backend => KiokuDB::Backend::Riak->new(
+        db => AnyEvent::Riak->new(
+            host => 'http://localhost:8098',
+            path => 'jiak',
+        ),
+        bucket => 'kiokudb',
+    ),
+);
+
+$dir->txn_do(sub { $dir->insert($key => $object) });
+```