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-As I was looking for a system to store documents at $work, Riak 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 here or watch an introduction
-here. Like <ahref="http://couchdb.apache.org/">CouchDB, 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 started to write one using AnyEvent::HTTP, and
-also a backend for KiokuDB.
-
-** 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
-
-#+BEGIN_EXAMPLE
-    % sudo aptitude install erlang
-#+END_EXAMPLE
-
-install everything you need. Next step is to install Riak:
-
-#+BEGIN_EXAMPLE
-    % 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`
-#+END_EXAMPLE
-
-Now, you can start to use it with
-
-#+BEGIN_EXAMPLE
-    % ./start-fresh config/riak-demo.erlenv
-#+END_EXAMPLE
-
-or if you want to test it in cluster mode, you can write a configuration
-like this:
-
-#+BEGIN_EXAMPLE
-        {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"}.
-#+END_EXAMPLE
-
-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
-
-#+BEGIN_EXAMPLE
-    % ./start-join.sh config/riak-demo.erlenv 192.168.0.11
-#+END_EXAMPLE
-
-where the IP address it the address of the first node in your cluster.
-
-Let's check if everything works:
-
-#+BEGIN_EXAMPLE
-    % 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/
-#+END_EXAMPLE
-
-will output (with the HTTP blabla)
-
-#+BEGIN_EXAMPLE
-        {"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":[]}
-#+END_EXAMPLE
-
-** 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
-
-#+BEGIN_SRC perl
-    my $client = AnyEvent::Riak->new(
-        host => 'http://127.0.0.1:8098',
-        path => 'jiak',
-    );
-#+END_SRC
-
-As Riak exposes to you it's N, R, and W value, you can also set them in
-creation the client:
-
-#+BEGIN_SRC perl
-    my $client = AnyEvent::Riak->new(
-        host => 'http://127.0.0.1:8098',
-        path => 'jiak',
-        r    => 2,
-        w    => 2,
-        dw   => 2,
-    );
-#+END_SRC
-
-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:
-
-#+BEGIN_SRC 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;
-#+END_SRC
-
-If there is an error, the croak method from AnyEvent is used, so you may
-prefer to do this:
-
-#+BEGIN_SRC 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];
-    };
-#+END_SRC
-
-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:
-
-#+BEGIN_SRC 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) });
-#+END_SRC