Hi to all, I made a simple RDF Gelly test and I shared it on my github repo at https://github.com/fpompermaier/rdf-gelly-test. I basically setup the Gelly stuff but I can't proceed and compute the drafted TODOs. Could someone help me and implementing them..? I think this could become a nice example of how Gelly could help in handling RDF graphs :)
Best, Flavio On Mon, Mar 23, 2015 at 10:41 AM, Flavio Pompermaier <pomperma...@okkam.it> wrote: > 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, > Flavio > > On Mon, Mar 23, 2015 at 10:31 AM, Vasiliki Kalavri < > vasilikikala...@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 >> > > >
