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authorFranck Cuny <franckcuny@gmail.com>2016-08-04 11:12:37 -0700
committerFranck Cuny <franckcuny@gmail.com>2016-08-04 11:12:37 -0700
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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) });
-```