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Florian Ragwitz > Data-Riak-1.7 > Data::Riak



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Module Version: 1.7   Source   Latest Release: Data-Riak-2.0


Data::Riak - An interface to a Riak server.


version 1.7


    my $riak = Data::Riak->new({
        transport => Data::Riak::HTTP->new({
            host => '',
            port => '8098',
            timeout => 5

    my $bucket = Data::Riak::Bucket->new({
        name => 'my_bucket',
        riak => $riak

    # Sets the value of "foo" to "bar", in my_bucket.
    $bucket->add('foo', 'bar');

    # Gets the Result object for "foo" in my_bucket.
    my $foo = $bucket->get('foo');

    # Returns "bar"
    my $value = $foo->value;

    # The HTTP status code, 200 on a successful GET.
    my $code = $foo->status_code;

Most of the interesting methods are really in Data::Riak::Bucket, so please read the documents there as well.


Data::Riak is a simple interface to a Riak server. It is not as complete as Net::Riak, nor does it aim to be; instead, it attempts to make the simple operations very simple, while still allowing you to do complicated tasks.


One of Riak's notable features is the ability to easily "linkwalk", or traverse relationships between objects to return relevant resultsets. The most obvious use of this is "Show me all of the friends of people Bob is friends with", but it has great potential, and it's the one thing we tried to make really simple with Data::Riak.

    # Add bar to the bucket, and list foo as a buddy.
    $bucket->add('bar', 'value of bar', {
      links => [ Data::Riak::Link->new(
        bucket => $bucket_name, riaktag => 'buddy', key =>'foo'
      ) ]

    # Add foo to the bucket, and list both bar and baz as "not a buddy"
    # create the links via the $bucket object and the bucket will be
    # inferred from the context
    $bucket->add('foo', 'value of foo', {
      links => [
        $bucket->create_link(riaktag => 'not a buddy', key =>'bar'),
        $bucket->create_link(riaktag => 'not a buddy', key =>'baz')

    # Get everyone in my_bucket who foo thinks is not a buddy.
    $walk_results = $bucket->linkwalk('foo', [ [ 'not a buddy', 1 ] ]);

    # Get everyone in my_bucket who baz thinks is a buddy of baz, get the people
    # they list as not a buddy, and only return those.
    $more_walk_results = $bucket->linkwalk(
      'baz', [ [ 'buddy', 0 ], [ 'not a buddy', 1 ] ],

    # You can also linkwalk outside of a bucket. The syntax changes, as such:
    $global_walk_results = $riak->linkwalk({
        bucket => 'my_bucket',
        object => 'foo',
        params => [ [ 'other_bucket', 'buddy', 1 ] ]

The bucket passed in on the riak object's linkwalk is the bucket the original target is in, and is used as a default if you only pass two options in the params lists.



A Data::Riak::Transport to be used in order to communicate with Riak. Currently, the only existing transport is Data::Riak::HTTP.



Tests to see if the specified Riak server is answering. Returns 0 for no, 1 for yes.


Attempts to retrieve information about the performance and configuration of the Riak node. Returns a hash reference containing the data provided by the /stats endpoint of the Riak node or throws an exception if the status information could not be retrieved.


Get the list of buckets. This is NOT RECOMMENDED for production systems, as Riak has to essentially walk the entire database. Here purely as a tool for debugging and convenience.

bucket ($name)

Given a $name, this will return a Data::Riak::Bucket object for it.


Influenced heavily by Net::Riak.

I wrote the first pass of Data::Riak, but large sections were added/fixed/rewritten to not suck by Stevan Little <stevan at> and Cory Watson <gphat at>.


Docs, docs, and more docs. The individual modules have a lot of functionality that needs documented.


This software is copyright (c) 2012 by Infinity Interactive, Inc..

This is free software; you can redistribute it and/or modify it under the same terms as the Perl 5 programming language system itself.



This software is copyright (c) 2013 by Infinity Interactive.

This is free software; you can redistribute it and/or modify it under the same terms as the Perl 5 programming language system itself.

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