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From: Nico Kruber <nico@data-artisans.com>
To: user@flink.apache.org
Cc: Daniel Dalek <p00temkin@gmail.com>
Subject: Re: Gelly and degree filtering
Date: Tue, 30 May 2017 10:44:18 +0200
Message-ID: <5648796.aWQuyHgHxn@nico-work>
Organization: data Artisans
In-Reply-To: <CAA62uzi47Bku3nntHh3Qdk=0JM9j8w-W-RWXz5F0EaPJ+u63qg@mail.gmail.com>
References: <CAA62uzi47Bku3nntHh3Qdk=0JM9j8w-W-RWXz5F0EaPJ+u63qg@mail.gmail.com>
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archived-at: Tue, 30 May 2017 08:44:38 -0000

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Does Martin's answer to a similar thread help?

https://lists.apache.org/thread.html/
000af2fb17a883b60f4a2359ebbeca42e3160c2167a88995c2ee28c2@
%3Cuser.flink.apache.org%3E

On Monday, 29 May 2017 19:38:20 CEST Martin Junghanns wrote:
> Hi Ali :)
> 
> You could compute the degrees beforehand (e.g. using the
> Graph.[in|out|get]degrees()) methods and use the resulting dataset as a
> new vertex dataset. You can now run your vertex-centric computation and
> access the degrees as vertex value.
> 
> Cheers,
> 
> Martin


On Sunday, 28 May 2017 12:02:52 CEST Daniel Dalek wrote:
> Hi all,
> 
> I have a question related to Gelly and graph filtering and hoping to get
> some pointers/input.
> 
> Basically I have a bipartite graph prepared for a signal/collect iteration,
> but want to prune it first to only include target nodes with x or more
> edges (indegree >= x). To filter on vertex value (or id) it seems
> straightforward to use subgraph and FilterFunction:
> 
> prunedG = graph.subgraph(
> new FilterFunction<Vertex<String, String>>() {
> public boolean filter(Vertex<String, String> vertex) {
> return (vertex.getValue() > 0);
> }
> }, ...
> 
> 
> Modifying this to call something like "return (vertex.getInDegree() >=x)"
> seemed appropriate but the degree information is in the graph (or available
> as separate methods when running GatherFunction etc), and not accessible
> directly from the vertex object inside the filter function.
> 
> Any suggestions on how to accomplish this?


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