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From Flavio Pompermaier <pomperma...@okkam.it>
Subject Re: Queries regarding RDFs with Flink
Date Mon, 23 Mar 2015 09:41:29 GMT
Thanks Vasiliki,
when I'll find the time I'll try to make a quick prototype using the
pointers you suggested!

Thanks for the support,

On Mon, Mar 23, 2015 at 10:31 AM, Vasiliki Kalavri <
vasilikikalavri@gmail.com> wrote:

> Hi Flavio,
> I'm not familiar with JSON-LD, but as far as I understand, you want to
> generate some trees from selected root nodes.
> Once you have created the Graph as Andra describes above, you can first
> filter out the edges that are of no interest to you, using filterOnEdges.
> There is a description of how edge filtering works in the Gelly docs [1].
> Then, you could use a vertex-centric iteration and propagate a message from
> the selected root node to the neighbors recursively, until you have the
> tree.
> In the vertex-centric model, you program from the perspective of a vertex
> in the graph. You basically need to define what each vertex does within
> each iteration (superstep). In Gelly this boils down to two things:
> (a) what messages this vertex will send to its neighbors and
> (b) how a vertex will update its value using the received messages.
> This is also described in the Gelly docs [2].
> Also, take a look at the Gelly library [3]. The library methods are
> implemented using this model and should give you an idea.
> In your case, you will probably need to simply propagate one message from
> the root node and gather the newly discovered neighbors in each superstep.
> I hope this helps! Let us know if you have further questions!
> -Vasia.
> [1]:
> http://ci.apache.org/projects/flink/flink-docs-master/gelly_guide.html#graph-transformations
> [2]:
> http://ci.apache.org/projects/flink/flink-docs-master/gelly_guide.html#vertex-centric-iterations
> [3]:
> http://github.com/apache/flink/tree/master/flink-staging/flink-gelly/src/main/java/orgThehveflink/graph/library

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