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From Claudio Martella <>
Subject Re: Announcing: Green-Marl/Giraph
Date Wed, 11 Jul 2012 19:57:47 GMT
This is really really cool stuff. congratulations!

On Wed, Jul 11, 2012 at 3:25 AM, Jan van der Lugt
<> wrote:
> Hi everyone,
> Some of you might already know Green-Marl, Green-Marl compatibility was
> even mentioned as a new feature for Giraph 0.2, but for those who don't,
> let me give you a quick introduction.
> Green-Marl is a domain-specific language tailored to graph algorithms. It
> has many features that makes it possible to write graph algorithms very
> concise and intuitive. For example, it has built-in constructs for graphs,
> node properties, and traversals. A more complete description is given here:
> Apart from the language,
> there is also a Green-Marl compiler that compiles the language to different
> targets. C++/OpenMP was initially supported, after which support for
> Stanford GPS (a Pregel-clone developed at Stanford) was added for a subset
> of the features in the Green-Marl language. The big advantage of using a
> language like Green-Marl is that it enables you to write implicitly
> parallel programs in an intuitive way with the compiler doing most of the
> heavy work such as generating the messaging, converting pull-based
> operation (remote reading) to push-based operations (message sending), etc.
> In the last few months I have worked on a few features in Giraph that
> enable Green-Marl to target Giraph as a back-end (namely GIRAPH-127,
> GIRAPH-192 and GIRAPH-216). Since these have all been merged, Green-Marl
> and Giraph should be compatible as of last week!
> Using Green-Marl with Giraph is very simple, as long as you have a working
> Hadoop/Giraph environment. Since the Green-Marl compiler is a
> source-to-source compiler, it is very easy to use it in an existing set-up.
> The steps to using Green-Marl are like this:
>    1. Download the Green-Marl compiler from
>, run in the
>    top-level dir and run make in the src dir. A more detailed explanation is
>    given in the Github readme.
>    2. Compile one of the examples (in the top-level directory) like
>    this: bin/gm_comp -t=giraph apps/src/
>    3. Move to the Giraph src directory or your own project,
>    package it into a .jar and go!
>    4. Explore more examples, modify them and start writing your own
> Green-Marl is actively being worked on within Oracle Labs, new features are
> being added to the language (such as collection node properties) and
> support for these features will be added to the distributed back-ends in
> the near future.
> In case of questions or suggestions, please send us a message! Feedback is
> very much appreciated and people are more than welcome to contribute
> everything from small bugfixes to entire back-ends ;-)
> - Jan

   Claudio Martella

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