[jira] [Created] (FLINK-2563) Gelly's Graph Algorithm Interface is limites

["Andra Lungu (JIRA)" <ji...@apache.org>]

Andra Lungu created FLINK-2563:
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             Summary: Gelly's Graph Algorithm Interface is limites
                 Key: FLINK-2563
                 URL: https://issues.apache.org/jira/browse/FLINK-2563
             Project: Flink
          Issue Type: Improvement
          Components: Gelly
    Affects Versions: 0.9, 0.10
            Reporter: Andra Lungu


Right now, Gelly's `GraphAlgorithm` interface only allows users/devs to return the same type of Graph.
public Graph<K, VV, EV> run(Graph<K, VV, EV> input) throws Exception;

In numerous cases, one needs to return a single value, or a modified graph. 
Off the top of my head, say one would like to implement a Triangle Count library method. That takes as input a Graph and returns the total number of triangles. 
https://github.com/andralungu/gelly-partitioning/blob/master/src/main/java/example/GSATriangleCount.java

With the current Gelly abstractions, something like this cannot be supported. Also if I initially had a Graph of Long, Long, NullValue and my algorithm changed the edge values to type Double, for instance, I would again have created an implementation which is not supported. 



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